mirror of
https://github.com/MariaDB/server.git
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127 lines
4.6 KiB
Text
127 lines
4.6 KiB
Text
SET @saved_include_delete_marked = @@GLOBAL.innodb_stats_include_delete_marked;
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SET GLOBAL innodb_stats_include_delete_marked = ON;
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SET @saved_traditional = @@GLOBAL.innodb_stats_traditional;
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SET GLOBAL innodb_stats_traditional=false;
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SET @saved_modified_counter = @@GLOBAL.innodb_stats_modified_counter;
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SET GLOBAL innodb_stats_modified_counter=1;
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CREATE TABLE t1 (id SERIAL, val INT UNSIGNED NOT NULL, KEY(val))
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ENGINE=INNODB STATS_PERSISTENT=1,STATS_AUTO_RECALC=1;
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CREATE TABLE t2 LIKE t1;
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INSERT INTO t1 (val) SELECT 4 FROM seq_1_to_16;
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SET STATEMENT use_stat_tables=never FOR
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ANALYZE TABLE t1;
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Table Op Msg_type Msg_text
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test.t1 analyze status OK
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connect con1, localhost, root,,;
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START TRANSACTION;
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DELETE FROM t1;
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SELECT COUNT(*) FROM t1;
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connection default;
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# With innodb_stats_include_delete_marked=ON,
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# DELETE must not affect statistics before COMMIT.
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EXPLAIN SELECT * FROM t1 WHERE val=4;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ref val val 4 const 1 Using index
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connection con1;
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COUNT(*)
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0
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ROLLBACK;
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SELECT COUNT(*) FROM t1;
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COUNT(*)
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16
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EXPLAIN SELECT * FROM t1 WHERE val=4;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ref val val 4 const 16 Using index
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BEGIN;
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DELETE FROM t1;
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COMMIT;
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SELECT COUNT(*) FROM t1;
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COUNT(*)
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0
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connection default;
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BEGIN;
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INSERT INTO t2 (val) SELECT 4 FROM seq_1_to_16;
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# The INSERT will show up before COMMIT.
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EXPLAIN SELECT * FROM t2 WHERE val=4;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t2 ref val val 4 const 16 Using index
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SELECT COUNT(*) FROM t2;
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COUNT(*)
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16
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# The ROLLBACK of the INSERT must affect the statistics.
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ROLLBACK;
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SELECT COUNT(*) FROM t2;
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COUNT(*)
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0
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connection con1;
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EXPLAIN SELECT * FROM t2 WHERE val=4;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t2 ref val val 4 const 1 Using index
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SET GLOBAL innodb_max_purge_lag_wait=0;
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# After COMMIT and purge, the DELETE must show up.
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EXPLAIN SELECT * FROM t1 WHERE val=4;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ref val val 4 const 1 Using index
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SET GLOBAL innodb_stats_include_delete_marked = OFF;
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BEGIN;
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INSERT INTO t1 (val) SELECT 4 FROM seq_1_to_16;
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EXPLAIN SELECT * FROM t1 WHERE val=4;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ref val val 4 const 16 Using index
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ROLLBACK;
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EXPLAIN SELECT * FROM t1 WHERE val=4;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ref val val 4 const 1 Using index
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BEGIN;
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INSERT INTO t1 (val) SELECT 4 FROM seq_1_to_16;
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COMMIT;
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EXPLAIN SELECT * FROM t1 WHERE val=4;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ref val val 4 const 16 Using index
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BEGIN;
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DELETE FROM t1;
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SELECT COUNT(*) FROM t1;
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COUNT(*)
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0
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# With innodb_stats_include_delete_marked=OFF,
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# DELETE must affect statistics even before COMMIT.
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# However, if there was a WHERE condition,
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# ha_innobase::records_in_range() would count the delete-marked records.
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EXPLAIN SELECT * FROM t1;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 index NULL val 4 NULL 1 Using index
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ROLLBACK;
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EXPLAIN SELECT * FROM t1;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 index NULL val 4 NULL 16 Using index
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SELECT COUNT(*) FROM t1;
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COUNT(*)
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16
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disconnect con1;
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connection default;
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DROP TABLE t1,t2;
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SET GLOBAL innodb_stats_include_delete_marked = @saved_include_delete_marked;
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SET GLOBAL innodb_stats_traditional = @saved_traditional;
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SET GLOBAL innodb_stats_modified_counter = @saved_modified_counter;
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CREATE TABLE bug12429573 (i INTEGER PRIMARY KEY, j INTEGER, KEY(j))
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ENGINE=INNODB STATS_PERSISTENT=1;
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SET STATEMENT use_stat_tables=never FOR
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ANALYZE TABLE bug12429573;
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Table Op Msg_type Msg_text
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test.bug12429573 analyze status OK
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SELECT last_update INTO @last FROM mysql.innodb_table_stats
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WHERE table_name = 'bug12429573';
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SELECT * FROM mysql.innodb_index_stats
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WHERE table_name = 'bug12429573' AND last_update!=@last;
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database_name table_name index_name last_update stat_name stat_value sample_size stat_description
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SET STATEMENT use_stat_tables=never FOR
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ANALYZE TABLE bug12429573;
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Table Op Msg_type Msg_text
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test.bug12429573 analyze status OK
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SELECT * FROM mysql.innodb_table_stats
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WHERE table_name = 'bug12429573' AND last_update=@last;
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database_name table_name last_update n_rows clustered_index_size sum_of_other_index_sizes
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SELECT * FROM mysql.innodb_index_stats
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WHERE table_name = 'bug12429573' AND last_update=@last;
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database_name table_name index_name last_update stat_name stat_value sample_size stat_description
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DROP TABLE bug12429573;
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