mirror of
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bug #27531: 5.1 part of the fix:
- added join cache indication in EXPLAIN (Extra column). - prefer filesort over full scan over index for ORDER BY (because it's faster). - when switching from REF to RANGE because RANGE uses longer key turn off sort on the head table only as the resulting RANGE access is a candidate for join cache and we don't want to disable it by sorting on the first table only. mysql-test/r/archive_gis.result: bug #27531: join cache in EXPLAIN mysql-test/r/compress.result: bug #27531: - join cache in EXPLAIN. - prefer filesort over full scan over index for ORDER BY. mysql-test/r/ctype_utf8.result: bug #27531: join cache in EXPLAIN mysql-test/r/derived.result: bug #27531: join cache in EXPLAIN mysql-test/r/distinct.result: bug #27531: join cache in EXPLAIN mysql-test/r/func_group.result: bug #27531: join cache in EXPLAIN mysql-test/r/func_group_innodb.result: bug #27531: join cache in EXPLAIN mysql-test/r/gis.result: bug #27531: join cache in EXPLAIN mysql-test/r/greedy_optimizer.result: bug #27531: join cache in EXPLAIN mysql-test/r/group_by.result: bug #27531: join cache in EXPLAIN mysql-test/r/group_min_max.result: bug #27531: join cache in EXPLAIN mysql-test/r/index_merge_myisam.result: bug #27531: join cache in EXPLAIN mysql-test/r/information_schema.result: bug #27531: join cache in EXPLAIN mysql-test/r/innodb_gis.result: bug #27531: join cache in EXPLAIN mysql-test/r/innodb_mysql.result: bug #27531: join cache in EXPLAIN mysql-test/r/join.result: bug #27531: join cache in EXPLAIN mysql-test/r/join_nested.result: bug #27531: join cache in EXPLAIN mysql-test/r/key_diff.result: bug #27531: join cache in EXPLAIN mysql-test/r/myisam.result: bug #27531: join cache in EXPLAIN mysql-test/r/ndb_condition_pushdown.result: bug #27531: join cache in EXPLAIN mysql-test/r/ndb_gis.result: bug #27531: join cache in EXPLAIN mysql-test/r/range.result: bug #27531: join cache in EXPLAIN mysql-test/r/row.result: bug #27531: join cache in EXPLAIN mysql-test/r/select.result: bug #27531: - join cache in EXPLAIN. - prefer filesort over full scan over index for ORDER BY. mysql-test/r/ssl.result: bug #27531: - join cache in EXPLAIN. - prefer filesort over full scan over index for ORDER BY. mysql-test/r/ssl_compress.result: bug #27531: - join cache in EXPLAIN. - prefer filesort over full scan over index for ORDER BY. mysql-test/r/subselect.result: bug #27531: join cache in EXPLAIN mysql-test/r/subselect3.result: bug #27531: join cache in EXPLAIN mysql-test/r/union.result: bug #27531: join cache in EXPLAIN mysql-test/r/view.result: bug #27531: join cache in EXPLAIN sql/sql_select.cc: bug #27531: - join cache in EXPLAIN. - prefer filesort over full scan over index for ORDER BY. - disable sorting on the first table only when switching from REF to RANGE.
This commit is contained in:
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parent
27aeb9e02b
commit
0c835da803
31 changed files with 216 additions and 202 deletions
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@ -120,11 +120,11 @@ select @@optimizer_search_depth;
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63
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explain select t1.c11 from t1, t2, t3, t4, t5, t6, t7 where t1.c12 = t2.c21 and t2.c22 = t3.c31 and t3.c32 = t4.c41 and t4.c42 = t5.c51 and t5.c52 = t6.c61 and t6.c62 = t7.c71;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ALL NULL NULL NULL NULL 3
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1 SIMPLE t1 ALL NULL NULL NULL NULL 3 Using join cache
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1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using where
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1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t2.c22 1
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1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t2.c22 1 Using join cache
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1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where
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1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t4.c42 1
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1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t4.c42 1 Using join cache
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1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where
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1 SIMPLE t7 eq_ref PRIMARY PRIMARY 4 test.t6.c62 1 Using index
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show status like 'Last_query_cost';
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@ -132,11 +132,11 @@ Variable_name Value
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Last_query_cost 821.837037
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explain select t1.c11 from t7, t6, t5, t4, t3, t2, t1 where t1.c12 = t2.c21 and t2.c22 = t3.c31 and t3.c32 = t4.c41 and t4.c42 = t5.c51 and t5.c52 = t6.c61 and t6.c62 = t7.c71;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ALL NULL NULL NULL NULL 3
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1 SIMPLE t1 ALL NULL NULL NULL NULL 3 Using join cache
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1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using where
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1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t2.c22 1
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1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t2.c22 1 Using join cache
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1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where
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1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t4.c42 1
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1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t4.c42 1 Using join cache
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1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where
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1 SIMPLE t7 eq_ref PRIMARY PRIMARY 4 test.t6.c62 1 Using index
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show status like 'Last_query_cost';
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@ -144,11 +144,11 @@ Variable_name Value
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Last_query_cost 821.837037
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explain select t1.c11 from t1, t2, t3, t4, t5, t6, t7 where t1.c11 = t2.c21 and t1.c12 = t3.c31 and t1.c13 = t4.c41 and t1.c14 = t5.c51 and t1.c15 = t6.c61 and t1.c16 = t7.c71;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ALL PRIMARY NULL NULL NULL 3
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1 SIMPLE t1 ALL PRIMARY NULL NULL NULL 3 Using join cache
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1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using where
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1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t1.c12 1 Using index
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1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t1.c12 1 Using index; Using join cache
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1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where
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1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t1.c14 1 Using index
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1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t1.c14 1 Using index; Using join cache
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1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where
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1 SIMPLE t7 eq_ref PRIMARY PRIMARY 4 test.t1.c16 1 Using index
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show status like 'Last_query_cost';
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@ -156,11 +156,11 @@ Variable_name Value
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Last_query_cost 794.837037
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explain select t1.c11 from t7, t6, t5, t4, t3, t2, t1 where t1.c11 = t2.c21 and t1.c12 = t3.c31 and t1.c13 = t4.c41 and t1.c14 = t5.c51 and t1.c15 = t6.c61 and t1.c16 = t7.c71;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ALL PRIMARY NULL NULL NULL 3
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1 SIMPLE t1 ALL PRIMARY NULL NULL NULL 3 Using join cache
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1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using where
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1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t1.c12 1 Using index
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1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t1.c12 1 Using index; Using join cache
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1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where
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1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t1.c14 1 Using index
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1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t1.c14 1 Using index; Using join cache
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1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where
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1 SIMPLE t7 eq_ref PRIMARY PRIMARY 4 test.t1.c16 1 Using index
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show status like 'Last_query_cost';
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@ -168,11 +168,11 @@ Variable_name Value
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Last_query_cost 794.837037
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explain select t1.c11 from t1, t2, t3, t4, t5, t6, t7 where t1.c11 = t2.c21 and t1.c12 = t3.c31 and t1.c13 = t4.c41 and t1.c14 = t5.c51 and t1.c15 = t6.c61 and t1.c16 = t7.c71 and t2.c22 = t3.c32 and t2.c23 = t4.c42 and t2.c24 = t5.c52 and t2.c25 = t6.c62 and t2.c26 = t7.c72 and t3.c33 = t4.c43 and t3.c34 = t5.c53 and t3.c35 = t6.c63 and t3.c36 = t7.c73 and t4.c42 = t5.c54 and t4.c43 = t6.c64 and t4.c44 = t7.c74 and t5.c52 = t6.c65 and t5.c53 = t7.c75 and t6.c62 = t7.c76;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ALL PRIMARY NULL NULL NULL 3
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1 SIMPLE t1 ALL PRIMARY NULL NULL NULL 3 Using join cache
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1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using where
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1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t1.c12 1 Using where
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1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t1.c12 1 Using where; Using join cache
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1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where
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1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t1.c14 1 Using where
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1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t1.c14 1 Using where; Using join cache
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1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where
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1 SIMPLE t7 eq_ref PRIMARY PRIMARY 4 test.t1.c16 1 Using where
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show status like 'Last_query_cost';
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@ -180,11 +180,11 @@ Variable_name Value
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Last_query_cost 794.837037
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explain select t1.c11 from t7, t6, t5, t4, t3, t2, t1 where t1.c11 = t2.c21 and t1.c12 = t3.c31 and t1.c13 = t4.c41 and t1.c14 = t5.c51 and t1.c15 = t6.c61 and t1.c16 = t7.c71 and t2.c22 = t3.c32 and t2.c23 = t4.c42 and t2.c24 = t5.c52 and t2.c25 = t6.c62 and t2.c26 = t7.c72 and t3.c33 = t4.c43 and t3.c34 = t5.c53 and t3.c35 = t6.c63 and t3.c36 = t7.c73 and t4.c42 = t5.c54 and t4.c43 = t6.c64 and t4.c44 = t7.c74 and t5.c52 = t6.c65 and t5.c53 = t7.c75 and t6.c62 = t7.c76;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ALL PRIMARY NULL NULL NULL 3
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1 SIMPLE t1 ALL PRIMARY NULL NULL NULL 3 Using join cache
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1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using where
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1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t1.c12 1 Using where
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1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t1.c12 1 Using where; Using join cache
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1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where
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1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t1.c14 1 Using where
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1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t1.c14 1 Using where; Using join cache
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1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where
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1 SIMPLE t7 eq_ref PRIMARY PRIMARY 4 test.t1.c16 1 Using where
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show status like 'Last_query_cost';
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@ -200,11 +200,11 @@ select @@optimizer_search_depth;
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0
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explain select t1.c11 from t1, t2, t3, t4, t5, t6, t7 where t1.c12 = t2.c21 and t2.c22 = t3.c31 and t3.c32 = t4.c41 and t4.c42 = t5.c51 and t5.c52 = t6.c61 and t6.c62 = t7.c71;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ALL NULL NULL NULL NULL 3
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1 SIMPLE t1 ALL NULL NULL NULL NULL 3 Using join cache
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1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using where
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1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t2.c22 1
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1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t2.c22 1 Using join cache
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1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where
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1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t4.c42 1
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1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t4.c42 1 Using join cache
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1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where
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1 SIMPLE t7 eq_ref PRIMARY PRIMARY 4 test.t6.c62 1 Using index
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show status like 'Last_query_cost';
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@ -212,11 +212,11 @@ Variable_name Value
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Last_query_cost 821.837037
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explain select t1.c11 from t7, t6, t5, t4, t3, t2, t1 where t1.c12 = t2.c21 and t2.c22 = t3.c31 and t3.c32 = t4.c41 and t4.c42 = t5.c51 and t5.c52 = t6.c61 and t6.c62 = t7.c71;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ALL NULL NULL NULL NULL 3
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1 SIMPLE t1 ALL NULL NULL NULL NULL 3 Using join cache
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1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using where
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1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t2.c22 1
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1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t2.c22 1 Using join cache
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1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where
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1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t4.c42 1
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1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t4.c42 1 Using join cache
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1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where
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1 SIMPLE t7 eq_ref PRIMARY PRIMARY 4 test.t6.c62 1 Using index
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show status like 'Last_query_cost';
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@ -224,11 +224,11 @@ Variable_name Value
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Last_query_cost 821.837037
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explain select t1.c11 from t1, t2, t3, t4, t5, t6, t7 where t1.c11 = t2.c21 and t1.c12 = t3.c31 and t1.c13 = t4.c41 and t1.c14 = t5.c51 and t1.c15 = t6.c61 and t1.c16 = t7.c71;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t2 ALL NULL NULL NULL NULL 6
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1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using join cache
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1 SIMPLE t4 ALL NULL NULL NULL NULL 12
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1 SIMPLE t1 eq_ref PRIMARY PRIMARY 4 test.t2.c21 1 Using where
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1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t1.c12 1 Using index
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1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t1.c14 1 Using index
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1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t1.c14 1 Using index; Using join cache
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1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where
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1 SIMPLE t7 eq_ref PRIMARY PRIMARY 4 test.t1.c16 1 Using index
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show status like 'Last_query_cost';
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@ -236,11 +236,11 @@ Variable_name Value
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Last_query_cost 289.418727
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explain select t1.c11 from t7, t6, t5, t4, t3, t2, t1 where t1.c11 = t2.c21 and t1.c12 = t3.c31 and t1.c13 = t4.c41 and t1.c14 = t5.c51 and t1.c15 = t6.c61 and t1.c16 = t7.c71;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t2 ALL NULL NULL NULL NULL 6
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1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using join cache
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1 SIMPLE t4 ALL NULL NULL NULL NULL 12
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1 SIMPLE t1 eq_ref PRIMARY PRIMARY 4 test.t2.c21 1 Using where
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1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t1.c12 1 Using index
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1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t1.c14 1 Using index
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1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t1.c14 1 Using index; Using join cache
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1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where
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1 SIMPLE t7 eq_ref PRIMARY PRIMARY 4 test.t1.c16 1 Using index
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show status like 'Last_query_cost';
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@ -248,11 +248,11 @@ Variable_name Value
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Last_query_cost 289.418727
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explain select t1.c11 from t1, t2, t3, t4, t5, t6, t7 where t1.c11 = t2.c21 and t1.c12 = t3.c31 and t1.c13 = t4.c41 and t1.c14 = t5.c51 and t1.c15 = t6.c61 and t1.c16 = t7.c71 and t2.c22 = t3.c32 and t2.c23 = t4.c42 and t2.c24 = t5.c52 and t2.c25 = t6.c62 and t2.c26 = t7.c72 and t3.c33 = t4.c43 and t3.c34 = t5.c53 and t3.c35 = t6.c63 and t3.c36 = t7.c73 and t4.c42 = t5.c54 and t4.c43 = t6.c64 and t4.c44 = t7.c74 and t5.c52 = t6.c65 and t5.c53 = t7.c75 and t6.c62 = t7.c76;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t2 ALL NULL NULL NULL NULL 6
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1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using join cache
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1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where
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1 SIMPLE t1 eq_ref PRIMARY PRIMARY 4 test.t2.c21 1 Using where
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1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t1.c12 1 Using where
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1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t1.c14 1 Using where
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1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t1.c14 1 Using where; Using join cache
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1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where
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1 SIMPLE t7 eq_ref PRIMARY PRIMARY 4 test.t1.c16 1 Using where
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show status like 'Last_query_cost';
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@ -260,11 +260,11 @@ Variable_name Value
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Last_query_cost 289.418727
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explain select t1.c11 from t7, t6, t5, t4, t3, t2, t1 where t1.c11 = t2.c21 and t1.c12 = t3.c31 and t1.c13 = t4.c41 and t1.c14 = t5.c51 and t1.c15 = t6.c61 and t1.c16 = t7.c71 and t2.c22 = t3.c32 and t2.c23 = t4.c42 and t2.c24 = t5.c52 and t2.c25 = t6.c62 and t2.c26 = t7.c72 and t3.c33 = t4.c43 and t3.c34 = t5.c53 and t3.c35 = t6.c63 and t3.c36 = t7.c73 and t4.c42 = t5.c54 and t4.c43 = t6.c64 and t4.c44 = t7.c74 and t5.c52 = t6.c65 and t5.c53 = t7.c75 and t6.c62 = t7.c76;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t2 ALL NULL NULL NULL NULL 6
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1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using join cache
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1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where
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1 SIMPLE t1 eq_ref PRIMARY PRIMARY 4 test.t2.c21 1 Using where
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1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t1.c12 1 Using where
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1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t1.c14 1 Using where
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1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t1.c14 1 Using where; Using join cache
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1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where
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1 SIMPLE t7 eq_ref PRIMARY PRIMARY 4 test.t1.c16 1 Using where
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show status like 'Last_query_cost';
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1
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explain select t1.c11 from t1, t2, t3, t4, t5, t6, t7 where t1.c12 = t2.c21 and t2.c22 = t3.c31 and t3.c32 = t4.c41 and t4.c42 = t5.c51 and t5.c52 = t6.c61 and t6.c62 = t7.c71;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ALL NULL NULL NULL NULL 3
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1 SIMPLE t1 ALL NULL NULL NULL NULL 3 Using join cache
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1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using where
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1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t2.c22 1
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1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t2.c22 1 Using join cache
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1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where
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1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t4.c42 1
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1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t4.c42 1 Using join cache
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1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where
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1 SIMPLE t7 eq_ref PRIMARY PRIMARY 4 test.t6.c62 1 Using index
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show status like 'Last_query_cost';
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@ -288,11 +288,11 @@ Variable_name Value
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Last_query_cost 821.837037
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explain select t1.c11 from t7, t6, t5, t4, t3, t2, t1 where t1.c12 = t2.c21 and t2.c22 = t3.c31 and t3.c32 = t4.c41 and t4.c42 = t5.c51 and t5.c52 = t6.c61 and t6.c62 = t7.c71;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ALL NULL NULL NULL NULL 3
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1 SIMPLE t1 ALL NULL NULL NULL NULL 3 Using join cache
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1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using where
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1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t2.c22 1
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1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t2.c22 1 Using join cache
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1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where
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1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t4.c42 1
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1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t4.c42 1 Using join cache
|
||||
1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where
|
||||
1 SIMPLE t7 eq_ref PRIMARY PRIMARY 4 test.t6.c62 1 Using index
|
||||
show status like 'Last_query_cost';
|
||||
|
|
@ -303,9 +303,9 @@ id select_type table type possible_keys key key_len ref rows Extra
|
|||
1 SIMPLE t1 ALL PRIMARY NULL NULL NULL 3
|
||||
1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t1.c12 1 Using index
|
||||
1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t1.c14 1 Using index
|
||||
1 SIMPLE t7 eq_ref PRIMARY PRIMARY 4 test.t1.c16 1 Using index
|
||||
1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using where
|
||||
1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where
|
||||
1 SIMPLE t7 eq_ref PRIMARY PRIMARY 4 test.t1.c16 1 Using index; Using join cache
|
||||
1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using where; Using join cache
|
||||
1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where; Using join cache
|
||||
1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where
|
||||
show status like 'Last_query_cost';
|
||||
Variable_name Value
|
||||
|
|
@ -315,9 +315,9 @@ id select_type table type possible_keys key key_len ref rows Extra
|
|||
1 SIMPLE t1 ALL PRIMARY NULL NULL NULL 3
|
||||
1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t1.c12 1 Using index
|
||||
1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t1.c14 1 Using index
|
||||
1 SIMPLE t7 eq_ref PRIMARY PRIMARY 4 test.t1.c16 1 Using index
|
||||
1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using where
|
||||
1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where
|
||||
1 SIMPLE t7 eq_ref PRIMARY PRIMARY 4 test.t1.c16 1 Using index; Using join cache
|
||||
1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using where; Using join cache
|
||||
1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where; Using join cache
|
||||
1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where
|
||||
show status like 'Last_query_cost';
|
||||
Variable_name Value
|
||||
|
|
@ -327,9 +327,9 @@ id select_type table type possible_keys key key_len ref rows Extra
|
|||
1 SIMPLE t1 ALL PRIMARY NULL NULL NULL 3
|
||||
1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t1.c12 1
|
||||
1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t1.c14 1 Using where
|
||||
1 SIMPLE t7 eq_ref PRIMARY PRIMARY 4 test.t1.c16 1 Using where
|
||||
1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using where
|
||||
1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where
|
||||
1 SIMPLE t7 eq_ref PRIMARY PRIMARY 4 test.t1.c16 1 Using where; Using join cache
|
||||
1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using where; Using join cache
|
||||
1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where; Using join cache
|
||||
1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where
|
||||
show status like 'Last_query_cost';
|
||||
Variable_name Value
|
||||
|
|
@ -339,9 +339,9 @@ id select_type table type possible_keys key key_len ref rows Extra
|
|||
1 SIMPLE t1 ALL PRIMARY NULL NULL NULL 3
|
||||
1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t1.c12 1
|
||||
1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t1.c14 1 Using where
|
||||
1 SIMPLE t7 eq_ref PRIMARY PRIMARY 4 test.t1.c16 1 Using where
|
||||
1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using where
|
||||
1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where
|
||||
1 SIMPLE t7 eq_ref PRIMARY PRIMARY 4 test.t1.c16 1 Using where; Using join cache
|
||||
1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using where; Using join cache
|
||||
1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where; Using join cache
|
||||
1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where
|
||||
show status like 'Last_query_cost';
|
||||
Variable_name Value
|
||||
|
|
@ -352,11 +352,11 @@ select @@optimizer_search_depth;
|
|||
62
|
||||
explain select t1.c11 from t1, t2, t3, t4, t5, t6, t7 where t1.c12 = t2.c21 and t2.c22 = t3.c31 and t3.c32 = t4.c41 and t4.c42 = t5.c51 and t5.c52 = t6.c61 and t6.c62 = t7.c71;
|
||||
id select_type table type possible_keys key key_len ref rows Extra
|
||||
1 SIMPLE t1 ALL NULL NULL NULL NULL 3
|
||||
1 SIMPLE t1 ALL NULL NULL NULL NULL 3 Using join cache
|
||||
1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using where
|
||||
1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t2.c22 1
|
||||
1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t2.c22 1 Using join cache
|
||||
1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where
|
||||
1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t4.c42 1
|
||||
1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t4.c42 1 Using join cache
|
||||
1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where
|
||||
1 SIMPLE t7 eq_ref PRIMARY PRIMARY 4 test.t6.c62 1 Using index
|
||||
show status like 'Last_query_cost';
|
||||
|
|
@ -364,11 +364,11 @@ Variable_name Value
|
|||
Last_query_cost 821.837037
|
||||
explain select t1.c11 from t7, t6, t5, t4, t3, t2, t1 where t1.c12 = t2.c21 and t2.c22 = t3.c31 and t3.c32 = t4.c41 and t4.c42 = t5.c51 and t5.c52 = t6.c61 and t6.c62 = t7.c71;
|
||||
id select_type table type possible_keys key key_len ref rows Extra
|
||||
1 SIMPLE t1 ALL NULL NULL NULL NULL 3
|
||||
1 SIMPLE t1 ALL NULL NULL NULL NULL 3 Using join cache
|
||||
1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using where
|
||||
1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t2.c22 1
|
||||
1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t2.c22 1 Using join cache
|
||||
1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where
|
||||
1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t4.c42 1
|
||||
1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t4.c42 1 Using join cache
|
||||
1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where
|
||||
1 SIMPLE t7 eq_ref PRIMARY PRIMARY 4 test.t6.c62 1 Using index
|
||||
show status like 'Last_query_cost';
|
||||
|
|
@ -376,11 +376,11 @@ Variable_name Value
|
|||
Last_query_cost 821.837037
|
||||
explain select t1.c11 from t1, t2, t3, t4, t5, t6, t7 where t1.c11 = t2.c21 and t1.c12 = t3.c31 and t1.c13 = t4.c41 and t1.c14 = t5.c51 and t1.c15 = t6.c61 and t1.c16 = t7.c71;
|
||||
id select_type table type possible_keys key key_len ref rows Extra
|
||||
1 SIMPLE t2 ALL NULL NULL NULL NULL 6
|
||||
1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using join cache
|
||||
1 SIMPLE t4 ALL NULL NULL NULL NULL 12
|
||||
1 SIMPLE t1 eq_ref PRIMARY PRIMARY 4 test.t2.c21 1 Using where
|
||||
1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t1.c12 1 Using index
|
||||
1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t1.c14 1 Using index
|
||||
1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t1.c14 1 Using index; Using join cache
|
||||
1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where
|
||||
1 SIMPLE t7 eq_ref PRIMARY PRIMARY 4 test.t1.c16 1 Using index
|
||||
show status like 'Last_query_cost';
|
||||
|
|
@ -388,11 +388,11 @@ Variable_name Value
|
|||
Last_query_cost 289.418727
|
||||
explain select t1.c11 from t7, t6, t5, t4, t3, t2, t1 where t1.c11 = t2.c21 and t1.c12 = t3.c31 and t1.c13 = t4.c41 and t1.c14 = t5.c51 and t1.c15 = t6.c61 and t1.c16 = t7.c71;
|
||||
id select_type table type possible_keys key key_len ref rows Extra
|
||||
1 SIMPLE t2 ALL NULL NULL NULL NULL 6
|
||||
1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using join cache
|
||||
1 SIMPLE t4 ALL NULL NULL NULL NULL 12
|
||||
1 SIMPLE t1 eq_ref PRIMARY PRIMARY 4 test.t2.c21 1 Using where
|
||||
1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t1.c12 1 Using index
|
||||
1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t1.c14 1 Using index
|
||||
1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t1.c14 1 Using index; Using join cache
|
||||
1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where
|
||||
1 SIMPLE t7 eq_ref PRIMARY PRIMARY 4 test.t1.c16 1 Using index
|
||||
show status like 'Last_query_cost';
|
||||
|
|
@ -400,11 +400,11 @@ Variable_name Value
|
|||
Last_query_cost 289.418727
|
||||
explain select t1.c11 from t1, t2, t3, t4, t5, t6, t7 where t1.c11 = t2.c21 and t1.c12 = t3.c31 and t1.c13 = t4.c41 and t1.c14 = t5.c51 and t1.c15 = t6.c61 and t1.c16 = t7.c71 and t2.c22 = t3.c32 and t2.c23 = t4.c42 and t2.c24 = t5.c52 and t2.c25 = t6.c62 and t2.c26 = t7.c72 and t3.c33 = t4.c43 and t3.c34 = t5.c53 and t3.c35 = t6.c63 and t3.c36 = t7.c73 and t4.c42 = t5.c54 and t4.c43 = t6.c64 and t4.c44 = t7.c74 and t5.c52 = t6.c65 and t5.c53 = t7.c75 and t6.c62 = t7.c76;
|
||||
id select_type table type possible_keys key key_len ref rows Extra
|
||||
1 SIMPLE t2 ALL NULL NULL NULL NULL 6
|
||||
1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using join cache
|
||||
1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where
|
||||
1 SIMPLE t1 eq_ref PRIMARY PRIMARY 4 test.t2.c21 1 Using where
|
||||
1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t1.c12 1 Using where
|
||||
1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t1.c14 1 Using where
|
||||
1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t1.c14 1 Using where; Using join cache
|
||||
1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where
|
||||
1 SIMPLE t7 eq_ref PRIMARY PRIMARY 4 test.t1.c16 1 Using where
|
||||
show status like 'Last_query_cost';
|
||||
|
|
@ -412,11 +412,11 @@ Variable_name Value
|
|||
Last_query_cost 289.418727
|
||||
explain select t1.c11 from t7, t6, t5, t4, t3, t2, t1 where t1.c11 = t2.c21 and t1.c12 = t3.c31 and t1.c13 = t4.c41 and t1.c14 = t5.c51 and t1.c15 = t6.c61 and t1.c16 = t7.c71 and t2.c22 = t3.c32 and t2.c23 = t4.c42 and t2.c24 = t5.c52 and t2.c25 = t6.c62 and t2.c26 = t7.c72 and t3.c33 = t4.c43 and t3.c34 = t5.c53 and t3.c35 = t6.c63 and t3.c36 = t7.c73 and t4.c42 = t5.c54 and t4.c43 = t6.c64 and t4.c44 = t7.c74 and t5.c52 = t6.c65 and t5.c53 = t7.c75 and t6.c62 = t7.c76;
|
||||
id select_type table type possible_keys key key_len ref rows Extra
|
||||
1 SIMPLE t2 ALL NULL NULL NULL NULL 6
|
||||
1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using join cache
|
||||
1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where
|
||||
1 SIMPLE t1 eq_ref PRIMARY PRIMARY 4 test.t2.c21 1 Using where
|
||||
1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t1.c12 1 Using where
|
||||
1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t1.c14 1 Using where
|
||||
1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t1.c14 1 Using where; Using join cache
|
||||
1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where
|
||||
1 SIMPLE t7 eq_ref PRIMARY PRIMARY 4 test.t1.c16 1 Using where
|
||||
show status like 'Last_query_cost';
|
||||
|
|
@ -432,11 +432,11 @@ select @@optimizer_search_depth;
|
|||
0
|
||||
explain select t1.c11 from t1, t2, t3, t4, t5, t6, t7 where t1.c12 = t2.c21 and t2.c22 = t3.c31 and t3.c32 = t4.c41 and t4.c42 = t5.c51 and t5.c52 = t6.c61 and t6.c62 = t7.c71;
|
||||
id select_type table type possible_keys key key_len ref rows Extra
|
||||
1 SIMPLE t1 ALL NULL NULL NULL NULL 3
|
||||
1 SIMPLE t1 ALL NULL NULL NULL NULL 3 Using join cache
|
||||
1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using where
|
||||
1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t2.c22 1
|
||||
1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t2.c22 1 Using join cache
|
||||
1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where
|
||||
1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t4.c42 1
|
||||
1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t4.c42 1 Using join cache
|
||||
1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where
|
||||
1 SIMPLE t7 eq_ref PRIMARY PRIMARY 4 test.t6.c62 1 Using index
|
||||
show status like 'Last_query_cost';
|
||||
|
|
@ -444,11 +444,11 @@ Variable_name Value
|
|||
Last_query_cost 821.837037
|
||||
explain select t1.c11 from t7, t6, t5, t4, t3, t2, t1 where t1.c12 = t2.c21 and t2.c22 = t3.c31 and t3.c32 = t4.c41 and t4.c42 = t5.c51 and t5.c52 = t6.c61 and t6.c62 = t7.c71;
|
||||
id select_type table type possible_keys key key_len ref rows Extra
|
||||
1 SIMPLE t1 ALL NULL NULL NULL NULL 3
|
||||
1 SIMPLE t1 ALL NULL NULL NULL NULL 3 Using join cache
|
||||
1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using where
|
||||
1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t2.c22 1
|
||||
1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t2.c22 1 Using join cache
|
||||
1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where
|
||||
1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t4.c42 1
|
||||
1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t4.c42 1 Using join cache
|
||||
1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where
|
||||
1 SIMPLE t7 eq_ref PRIMARY PRIMARY 4 test.t6.c62 1 Using index
|
||||
show status like 'Last_query_cost';
|
||||
|
|
@ -456,11 +456,11 @@ Variable_name Value
|
|||
Last_query_cost 821.837037
|
||||
explain select t1.c11 from t1, t2, t3, t4, t5, t6, t7 where t1.c11 = t2.c21 and t1.c12 = t3.c31 and t1.c13 = t4.c41 and t1.c14 = t5.c51 and t1.c15 = t6.c61 and t1.c16 = t7.c71;
|
||||
id select_type table type possible_keys key key_len ref rows Extra
|
||||
1 SIMPLE t1 ALL PRIMARY NULL NULL NULL 3
|
||||
1 SIMPLE t1 ALL PRIMARY NULL NULL NULL 3 Using join cache
|
||||
1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using where
|
||||
1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t1.c12 1 Using index
|
||||
1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t1.c12 1 Using index; Using join cache
|
||||
1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where
|
||||
1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t1.c14 1 Using index
|
||||
1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t1.c14 1 Using index; Using join cache
|
||||
1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where
|
||||
1 SIMPLE t7 eq_ref PRIMARY PRIMARY 4 test.t1.c16 1 Using index
|
||||
show status like 'Last_query_cost';
|
||||
|
|
@ -468,11 +468,11 @@ Variable_name Value
|
|||
Last_query_cost 794.837037
|
||||
explain select t1.c11 from t7, t6, t5, t4, t3, t2, t1 where t1.c11 = t2.c21 and t1.c12 = t3.c31 and t1.c13 = t4.c41 and t1.c14 = t5.c51 and t1.c15 = t6.c61 and t1.c16 = t7.c71;
|
||||
id select_type table type possible_keys key key_len ref rows Extra
|
||||
1 SIMPLE t1 ALL PRIMARY NULL NULL NULL 3
|
||||
1 SIMPLE t1 ALL PRIMARY NULL NULL NULL 3 Using join cache
|
||||
1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using where
|
||||
1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t1.c12 1 Using index
|
||||
1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t1.c12 1 Using index; Using join cache
|
||||
1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where
|
||||
1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t1.c14 1 Using index
|
||||
1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t1.c14 1 Using index; Using join cache
|
||||
1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where
|
||||
1 SIMPLE t7 eq_ref PRIMARY PRIMARY 4 test.t1.c16 1 Using index
|
||||
show status like 'Last_query_cost';
|
||||
|
|
@ -480,11 +480,11 @@ Variable_name Value
|
|||
Last_query_cost 794.837037
|
||||
explain select t1.c11 from t1, t2, t3, t4, t5, t6, t7 where t1.c11 = t2.c21 and t1.c12 = t3.c31 and t1.c13 = t4.c41 and t1.c14 = t5.c51 and t1.c15 = t6.c61 and t1.c16 = t7.c71 and t2.c22 = t3.c32 and t2.c23 = t4.c42 and t2.c24 = t5.c52 and t2.c25 = t6.c62 and t2.c26 = t7.c72 and t3.c33 = t4.c43 and t3.c34 = t5.c53 and t3.c35 = t6.c63 and t3.c36 = t7.c73 and t4.c42 = t5.c54 and t4.c43 = t6.c64 and t4.c44 = t7.c74 and t5.c52 = t6.c65 and t5.c53 = t7.c75 and t6.c62 = t7.c76;
|
||||
id select_type table type possible_keys key key_len ref rows Extra
|
||||
1 SIMPLE t1 ALL PRIMARY NULL NULL NULL 3
|
||||
1 SIMPLE t1 ALL PRIMARY NULL NULL NULL 3 Using join cache
|
||||
1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using where
|
||||
1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t1.c12 1 Using where
|
||||
1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t1.c12 1 Using where; Using join cache
|
||||
1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where
|
||||
1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t1.c14 1 Using where
|
||||
1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t1.c14 1 Using where; Using join cache
|
||||
1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where
|
||||
1 SIMPLE t7 eq_ref PRIMARY PRIMARY 4 test.t1.c16 1 Using where
|
||||
show status like 'Last_query_cost';
|
||||
|
|
@ -492,11 +492,11 @@ Variable_name Value
|
|||
Last_query_cost 794.837037
|
||||
explain select t1.c11 from t7, t6, t5, t4, t3, t2, t1 where t1.c11 = t2.c21 and t1.c12 = t3.c31 and t1.c13 = t4.c41 and t1.c14 = t5.c51 and t1.c15 = t6.c61 and t1.c16 = t7.c71 and t2.c22 = t3.c32 and t2.c23 = t4.c42 and t2.c24 = t5.c52 and t2.c25 = t6.c62 and t2.c26 = t7.c72 and t3.c33 = t4.c43 and t3.c34 = t5.c53 and t3.c35 = t6.c63 and t3.c36 = t7.c73 and t4.c42 = t5.c54 and t4.c43 = t6.c64 and t4.c44 = t7.c74 and t5.c52 = t6.c65 and t5.c53 = t7.c75 and t6.c62 = t7.c76;
|
||||
id select_type table type possible_keys key key_len ref rows Extra
|
||||
1 SIMPLE t1 ALL PRIMARY NULL NULL NULL 3
|
||||
1 SIMPLE t1 ALL PRIMARY NULL NULL NULL 3 Using join cache
|
||||
1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using where
|
||||
1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t1.c12 1 Using where
|
||||
1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t1.c12 1 Using where; Using join cache
|
||||
1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where
|
||||
1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t1.c14 1 Using where
|
||||
1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t1.c14 1 Using where; Using join cache
|
||||
1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where
|
||||
1 SIMPLE t7 eq_ref PRIMARY PRIMARY 4 test.t1.c16 1 Using where
|
||||
show status like 'Last_query_cost';
|
||||
|
|
@ -508,11 +508,11 @@ select @@optimizer_search_depth;
|
|||
1
|
||||
explain select t1.c11 from t1, t2, t3, t4, t5, t6, t7 where t1.c12 = t2.c21 and t2.c22 = t3.c31 and t3.c32 = t4.c41 and t4.c42 = t5.c51 and t5.c52 = t6.c61 and t6.c62 = t7.c71;
|
||||
id select_type table type possible_keys key key_len ref rows Extra
|
||||
1 SIMPLE t1 ALL NULL NULL NULL NULL 3
|
||||
1 SIMPLE t1 ALL NULL NULL NULL NULL 3 Using join cache
|
||||
1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using where
|
||||
1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t2.c22 1
|
||||
1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t2.c22 1 Using join cache
|
||||
1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where
|
||||
1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t4.c42 1
|
||||
1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t4.c42 1 Using join cache
|
||||
1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where
|
||||
1 SIMPLE t7 eq_ref PRIMARY PRIMARY 4 test.t6.c62 1 Using index
|
||||
show status like 'Last_query_cost';
|
||||
|
|
@ -520,11 +520,11 @@ Variable_name Value
|
|||
Last_query_cost 821.837037
|
||||
explain select t1.c11 from t7, t6, t5, t4, t3, t2, t1 where t1.c12 = t2.c21 and t2.c22 = t3.c31 and t3.c32 = t4.c41 and t4.c42 = t5.c51 and t5.c52 = t6.c61 and t6.c62 = t7.c71;
|
||||
id select_type table type possible_keys key key_len ref rows Extra
|
||||
1 SIMPLE t1 ALL NULL NULL NULL NULL 3
|
||||
1 SIMPLE t1 ALL NULL NULL NULL NULL 3 Using join cache
|
||||
1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using where
|
||||
1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t2.c22 1
|
||||
1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t2.c22 1 Using join cache
|
||||
1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where
|
||||
1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t4.c42 1
|
||||
1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t4.c42 1 Using join cache
|
||||
1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where
|
||||
1 SIMPLE t7 eq_ref PRIMARY PRIMARY 4 test.t6.c62 1 Using index
|
||||
show status like 'Last_query_cost';
|
||||
|
|
@ -535,9 +535,9 @@ id select_type table type possible_keys key key_len ref rows Extra
|
|||
1 SIMPLE t1 ALL PRIMARY NULL NULL NULL 3
|
||||
1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t1.c12 1 Using index
|
||||
1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t1.c14 1 Using index
|
||||
1 SIMPLE t7 eq_ref PRIMARY PRIMARY 4 test.t1.c16 1 Using index
|
||||
1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using where
|
||||
1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where
|
||||
1 SIMPLE t7 eq_ref PRIMARY PRIMARY 4 test.t1.c16 1 Using index; Using join cache
|
||||
1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using where; Using join cache
|
||||
1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where; Using join cache
|
||||
1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where
|
||||
show status like 'Last_query_cost';
|
||||
Variable_name Value
|
||||
|
|
@ -547,9 +547,9 @@ id select_type table type possible_keys key key_len ref rows Extra
|
|||
1 SIMPLE t1 ALL PRIMARY NULL NULL NULL 3
|
||||
1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t1.c12 1 Using index
|
||||
1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t1.c14 1 Using index
|
||||
1 SIMPLE t7 eq_ref PRIMARY PRIMARY 4 test.t1.c16 1 Using index
|
||||
1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using where
|
||||
1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where
|
||||
1 SIMPLE t7 eq_ref PRIMARY PRIMARY 4 test.t1.c16 1 Using index; Using join cache
|
||||
1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using where; Using join cache
|
||||
1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where; Using join cache
|
||||
1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where
|
||||
show status like 'Last_query_cost';
|
||||
Variable_name Value
|
||||
|
|
@ -559,9 +559,9 @@ id select_type table type possible_keys key key_len ref rows Extra
|
|||
1 SIMPLE t1 ALL PRIMARY NULL NULL NULL 3
|
||||
1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t1.c12 1
|
||||
1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t1.c14 1 Using where
|
||||
1 SIMPLE t7 eq_ref PRIMARY PRIMARY 4 test.t1.c16 1 Using where
|
||||
1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using where
|
||||
1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where
|
||||
1 SIMPLE t7 eq_ref PRIMARY PRIMARY 4 test.t1.c16 1 Using where; Using join cache
|
||||
1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using where; Using join cache
|
||||
1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where; Using join cache
|
||||
1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where
|
||||
show status like 'Last_query_cost';
|
||||
Variable_name Value
|
||||
|
|
@ -571,9 +571,9 @@ id select_type table type possible_keys key key_len ref rows Extra
|
|||
1 SIMPLE t1 ALL PRIMARY NULL NULL NULL 3
|
||||
1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t1.c12 1
|
||||
1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t1.c14 1 Using where
|
||||
1 SIMPLE t7 eq_ref PRIMARY PRIMARY 4 test.t1.c16 1 Using where
|
||||
1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using where
|
||||
1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where
|
||||
1 SIMPLE t7 eq_ref PRIMARY PRIMARY 4 test.t1.c16 1 Using where; Using join cache
|
||||
1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using where; Using join cache
|
||||
1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where; Using join cache
|
||||
1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where
|
||||
show status like 'Last_query_cost';
|
||||
Variable_name Value
|
||||
|
|
@ -584,11 +584,11 @@ select @@optimizer_search_depth;
|
|||
62
|
||||
explain select t1.c11 from t1, t2, t3, t4, t5, t6, t7 where t1.c12 = t2.c21 and t2.c22 = t3.c31 and t3.c32 = t4.c41 and t4.c42 = t5.c51 and t5.c52 = t6.c61 and t6.c62 = t7.c71;
|
||||
id select_type table type possible_keys key key_len ref rows Extra
|
||||
1 SIMPLE t1 ALL NULL NULL NULL NULL 3
|
||||
1 SIMPLE t1 ALL NULL NULL NULL NULL 3 Using join cache
|
||||
1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using where
|
||||
1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t2.c22 1
|
||||
1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t2.c22 1 Using join cache
|
||||
1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where
|
||||
1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t4.c42 1
|
||||
1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t4.c42 1 Using join cache
|
||||
1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where
|
||||
1 SIMPLE t7 eq_ref PRIMARY PRIMARY 4 test.t6.c62 1 Using index
|
||||
show status like 'Last_query_cost';
|
||||
|
|
@ -596,11 +596,11 @@ Variable_name Value
|
|||
Last_query_cost 821.837037
|
||||
explain select t1.c11 from t7, t6, t5, t4, t3, t2, t1 where t1.c12 = t2.c21 and t2.c22 = t3.c31 and t3.c32 = t4.c41 and t4.c42 = t5.c51 and t5.c52 = t6.c61 and t6.c62 = t7.c71;
|
||||
id select_type table type possible_keys key key_len ref rows Extra
|
||||
1 SIMPLE t1 ALL NULL NULL NULL NULL 3
|
||||
1 SIMPLE t1 ALL NULL NULL NULL NULL 3 Using join cache
|
||||
1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using where
|
||||
1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t2.c22 1
|
||||
1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t2.c22 1 Using join cache
|
||||
1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where
|
||||
1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t4.c42 1
|
||||
1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t4.c42 1 Using join cache
|
||||
1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where
|
||||
1 SIMPLE t7 eq_ref PRIMARY PRIMARY 4 test.t6.c62 1 Using index
|
||||
show status like 'Last_query_cost';
|
||||
|
|
@ -608,11 +608,11 @@ Variable_name Value
|
|||
Last_query_cost 821.837037
|
||||
explain select t1.c11 from t1, t2, t3, t4, t5, t6, t7 where t1.c11 = t2.c21 and t1.c12 = t3.c31 and t1.c13 = t4.c41 and t1.c14 = t5.c51 and t1.c15 = t6.c61 and t1.c16 = t7.c71;
|
||||
id select_type table type possible_keys key key_len ref rows Extra
|
||||
1 SIMPLE t1 ALL PRIMARY NULL NULL NULL 3
|
||||
1 SIMPLE t1 ALL PRIMARY NULL NULL NULL 3 Using join cache
|
||||
1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using where
|
||||
1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t1.c12 1 Using index
|
||||
1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t1.c12 1 Using index; Using join cache
|
||||
1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where
|
||||
1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t1.c14 1 Using index
|
||||
1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t1.c14 1 Using index; Using join cache
|
||||
1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where
|
||||
1 SIMPLE t7 eq_ref PRIMARY PRIMARY 4 test.t1.c16 1 Using index
|
||||
show status like 'Last_query_cost';
|
||||
|
|
@ -620,11 +620,11 @@ Variable_name Value
|
|||
Last_query_cost 794.837037
|
||||
explain select t1.c11 from t7, t6, t5, t4, t3, t2, t1 where t1.c11 = t2.c21 and t1.c12 = t3.c31 and t1.c13 = t4.c41 and t1.c14 = t5.c51 and t1.c15 = t6.c61 and t1.c16 = t7.c71;
|
||||
id select_type table type possible_keys key key_len ref rows Extra
|
||||
1 SIMPLE t1 ALL PRIMARY NULL NULL NULL 3
|
||||
1 SIMPLE t1 ALL PRIMARY NULL NULL NULL 3 Using join cache
|
||||
1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using where
|
||||
1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t1.c12 1 Using index
|
||||
1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t1.c12 1 Using index; Using join cache
|
||||
1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where
|
||||
1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t1.c14 1 Using index
|
||||
1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t1.c14 1 Using index; Using join cache
|
||||
1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where
|
||||
1 SIMPLE t7 eq_ref PRIMARY PRIMARY 4 test.t1.c16 1 Using index
|
||||
show status like 'Last_query_cost';
|
||||
|
|
@ -632,11 +632,11 @@ Variable_name Value
|
|||
Last_query_cost 794.837037
|
||||
explain select t1.c11 from t1, t2, t3, t4, t5, t6, t7 where t1.c11 = t2.c21 and t1.c12 = t3.c31 and t1.c13 = t4.c41 and t1.c14 = t5.c51 and t1.c15 = t6.c61 and t1.c16 = t7.c71 and t2.c22 = t3.c32 and t2.c23 = t4.c42 and t2.c24 = t5.c52 and t2.c25 = t6.c62 and t2.c26 = t7.c72 and t3.c33 = t4.c43 and t3.c34 = t5.c53 and t3.c35 = t6.c63 and t3.c36 = t7.c73 and t4.c42 = t5.c54 and t4.c43 = t6.c64 and t4.c44 = t7.c74 and t5.c52 = t6.c65 and t5.c53 = t7.c75 and t6.c62 = t7.c76;
|
||||
id select_type table type possible_keys key key_len ref rows Extra
|
||||
1 SIMPLE t1 ALL PRIMARY NULL NULL NULL 3
|
||||
1 SIMPLE t1 ALL PRIMARY NULL NULL NULL 3 Using join cache
|
||||
1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using where
|
||||
1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t1.c12 1 Using where
|
||||
1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t1.c12 1 Using where; Using join cache
|
||||
1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where
|
||||
1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t1.c14 1 Using where
|
||||
1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t1.c14 1 Using where; Using join cache
|
||||
1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where
|
||||
1 SIMPLE t7 eq_ref PRIMARY PRIMARY 4 test.t1.c16 1 Using where
|
||||
show status like 'Last_query_cost';
|
||||
|
|
@ -644,11 +644,11 @@ Variable_name Value
|
|||
Last_query_cost 794.837037
|
||||
explain select t1.c11 from t7, t6, t5, t4, t3, t2, t1 where t1.c11 = t2.c21 and t1.c12 = t3.c31 and t1.c13 = t4.c41 and t1.c14 = t5.c51 and t1.c15 = t6.c61 and t1.c16 = t7.c71 and t2.c22 = t3.c32 and t2.c23 = t4.c42 and t2.c24 = t5.c52 and t2.c25 = t6.c62 and t2.c26 = t7.c72 and t3.c33 = t4.c43 and t3.c34 = t5.c53 and t3.c35 = t6.c63 and t3.c36 = t7.c73 and t4.c42 = t5.c54 and t4.c43 = t6.c64 and t4.c44 = t7.c74 and t5.c52 = t6.c65 and t5.c53 = t7.c75 and t6.c62 = t7.c76;
|
||||
id select_type table type possible_keys key key_len ref rows Extra
|
||||
1 SIMPLE t1 ALL PRIMARY NULL NULL NULL 3
|
||||
1 SIMPLE t1 ALL PRIMARY NULL NULL NULL 3 Using join cache
|
||||
1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using where
|
||||
1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t1.c12 1 Using where
|
||||
1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t1.c12 1 Using where; Using join cache
|
||||
1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where
|
||||
1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t1.c14 1 Using where
|
||||
1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t1.c14 1 Using where; Using join cache
|
||||
1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where
|
||||
1 SIMPLE t7 eq_ref PRIMARY PRIMARY 4 test.t1.c16 1 Using where
|
||||
show status like 'Last_query_cost';
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue