2011-12-31 11:25:57 +01:00
DROP TABLE IF EXISTS t1,t2,t3,t4;
DROP DATABASE IF EXISTS dbt3_s001;
SET SESSION STORAGE_ENGINE='InnoDB';
CREATE DATABASE dbt3_s001;
use dbt3_s001;
set @save_ext_key_optimizer_switch=@@optimizer_switch;
set optimizer_switch='extended_keys=off';
explain
select count(*) from lineitem where l_orderkey=130 and l_shipdate='1992-07-01';
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE lineitem ref PRIMARY,i_l_shipdate,i_l_orderkey,i_l_orderkey_quantity PRIMARY 4 const 5 Using where
flush status;
select count(*) from lineitem where l_orderkey=130 and l_shipdate='1992-07-01';
count(*)
1
show status like 'handler_read%';
Variable_name Value
Handler_read_first 0
Handler_read_key 1
2012-03-03 00:03:20 +01:00
Handler_read_last 0
2011-12-31 11:25:57 +01:00
Handler_read_next 5
Handler_read_prev 0
Handler_read_rnd 0
2012-01-25 06:12:02 +01:00
Handler_read_rnd_deleted 0
2011-12-31 11:25:57 +01:00
Handler_read_rnd_next 0
set optimizer_switch='extended_keys=on';
explain
select count(*) from lineitem where l_orderkey=130 and l_shipdate='1992-07-01';
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE lineitem ref PRIMARY,i_l_shipdate,i_l_orderkey,i_l_orderkey_quantity i_l_shipdate 8 const,const 1 Using index
flush status;
select count(*) from lineitem where l_orderkey=130 and l_shipdate='1992-07-01';
count(*)
1
show status like 'handler_read%';
Variable_name Value
Handler_read_first 0
Handler_read_key 1
2012-03-03 00:03:20 +01:00
Handler_read_last 0
2011-12-31 11:25:57 +01:00
Handler_read_next 1
Handler_read_prev 0
Handler_read_rnd 0
2012-01-25 06:12:02 +01:00
Handler_read_rnd_deleted 0
2011-12-31 11:25:57 +01:00
Handler_read_rnd_next 0
set optimizer_switch='extended_keys=off';
explain
select count(*) from lineitem
where l_orderkey=130 and l_linenumber=2 and l_shipdate='1992-07-01';
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE lineitem const PRIMARY,i_l_shipdate,i_l_orderkey,i_l_orderkey_quantity PRIMARY 8 const,const 1
flush status;
select count(*) from lineitem
where l_orderkey=130 and l_linenumber=2 and l_shipdate='1992-07-01';
count(*)
1
show status like 'handler_read%';
Variable_name Value
Handler_read_first 0
Handler_read_key 1
2012-03-03 00:03:20 +01:00
Handler_read_last 0
2011-12-31 11:25:57 +01:00
Handler_read_next 0
Handler_read_prev 0
Handler_read_rnd 0
2012-01-25 06:12:02 +01:00
Handler_read_rnd_deleted 0
2011-12-31 11:25:57 +01:00
Handler_read_rnd_next 0
set optimizer_switch='extended_keys=on';
explain
select count(*) from lineitem
where l_orderkey=130 and l_linenumber=2 and l_shipdate='1992-07-01';
id select_type table type possible_keys key key_len ref rows Extra
2012-01-25 08:34:02 +01:00
1 SIMPLE lineitem const PRIMARY,i_l_shipdate,i_l_orderkey,i_l_orderkey_quantity PRIMARY 8 const,const 1
2011-12-31 11:25:57 +01:00
flush status;
select count(*) from lineitem
where l_orderkey=130 and l_linenumber=2 and l_shipdate='1992-07-01';
count(*)
1
show status like 'handler_read%';
Variable_name Value
Handler_read_first 0
Handler_read_key 1
2012-03-03 00:03:20 +01:00
Handler_read_last 0
2011-12-31 11:25:57 +01:00
Handler_read_next 0
Handler_read_prev 0
Handler_read_rnd 0
2012-01-25 06:12:02 +01:00
Handler_read_rnd_deleted 0
2011-12-31 11:25:57 +01:00
Handler_read_rnd_next 0
set optimizer_switch='extended_keys=off';
explain
select count(*) from lineitem
where l_shipdate='1992-07-01' and l_orderkey between 1 and 1000;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE lineitem ref PRIMARY,i_l_shipdate,i_l_orderkey,i_l_orderkey_quantity i_l_shipdate 4 const 6 Using where; Using index
flush status;
select count(*) from lineitem
where l_shipdate='1992-07-01' and l_orderkey between 1 and 1000;
count(*)
1
show status like 'handler_read%';
Variable_name Value
Handler_read_first 0
Handler_read_key 1
2012-03-03 00:03:20 +01:00
Handler_read_last 0
2011-12-31 11:25:57 +01:00
Handler_read_next 6
Handler_read_prev 0
Handler_read_rnd 0
2012-01-25 06:12:02 +01:00
Handler_read_rnd_deleted 0
2011-12-31 11:25:57 +01:00
Handler_read_rnd_next 0
set optimizer_switch='extended_keys=on';
explain
select count(*) from lineitem
where l_shipdate='1992-07-01' and l_orderkey between 1 and 1000;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE lineitem range PRIMARY,i_l_shipdate,i_l_orderkey,i_l_orderkey_quantity i_l_shipdate 8 NULL 1 Using where; Using index
flush status;
select count(*) from lineitem
where l_shipdate='1992-07-01' and l_orderkey between 1 and 1000;
count(*)
1
show status like 'handler_read%';
Variable_name Value
Handler_read_first 0
Handler_read_key 1
2012-03-03 00:03:20 +01:00
Handler_read_last 0
2011-12-31 11:25:57 +01:00
Handler_read_next 1
Handler_read_prev 0
Handler_read_rnd 0
2012-01-25 06:12:02 +01:00
Handler_read_rnd_deleted 0
2011-12-31 11:25:57 +01:00
Handler_read_rnd_next 0
set optimizer_switch='extended_keys=off';
explain
select l_orderkey, l_linenumber from lineitem
where l_shipdate='1992-07-01' and l_orderkey between 1001 and 2000;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE lineitem ref PRIMARY,i_l_shipdate,i_l_orderkey,i_l_orderkey_quantity i_l_shipdate 4 const 6 Using where; Using index
flush status;
select l_orderkey, l_linenumber from lineitem
where l_shipdate='1992-07-01' and l_orderkey between 1001 and 2000;
l_orderkey l_linenumber
1088 3
1217 1
1221 3
show status like 'handler_read%';
Variable_name Value
Handler_read_first 0
Handler_read_key 1
2012-03-03 00:03:20 +01:00
Handler_read_last 0
2011-12-31 11:25:57 +01:00
Handler_read_next 6
Handler_read_prev 0
Handler_read_rnd 0
2012-01-25 06:12:02 +01:00
Handler_read_rnd_deleted 0
2011-12-31 11:25:57 +01:00
Handler_read_rnd_next 0
set optimizer_switch='extended_keys=on';
explain
select l_orderkey, l_linenumber from lineitem
where l_shipdate='1992-07-01' and l_orderkey between 1001 and 2000;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE lineitem range PRIMARY,i_l_shipdate,i_l_orderkey,i_l_orderkey_quantity i_l_shipdate 8 NULL 3 Using where; Using index
flush status;
select l_orderkey, l_linenumber from lineitem
where l_shipdate='1992-07-01' and l_orderkey between 1001 and 2000;
l_orderkey l_linenumber
1088 3
1217 1
1221 3
show status like 'handler_read%';
Variable_name Value
Handler_read_first 0
Handler_read_key 1
2012-03-03 00:03:20 +01:00
Handler_read_last 0
2011-12-31 11:25:57 +01:00
Handler_read_next 3
Handler_read_prev 0
Handler_read_rnd 0
2012-01-25 06:12:02 +01:00
Handler_read_rnd_deleted 0
2011-12-31 11:25:57 +01:00
Handler_read_rnd_next 0
set optimizer_switch='extended_keys=off';
explain
select min(l_orderkey) from lineitem where l_shipdate='1992-07-01';
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE lineitem ref i_l_shipdate i_l_shipdate 4 const 6 Using index
flush status;
select min(l_orderkey) from lineitem where l_shipdate='1992-07-01';
min(l_orderkey)
130
show status like 'handler_read%';
Variable_name Value
Handler_read_first 0
Handler_read_key 1
2012-03-03 00:03:20 +01:00
Handler_read_last 0
2011-12-31 11:25:57 +01:00
Handler_read_next 6
Handler_read_prev 0
Handler_read_rnd 0
2012-01-25 06:12:02 +01:00
Handler_read_rnd_deleted 0
2011-12-31 11:25:57 +01:00
Handler_read_rnd_next 0
set optimizer_switch='extended_keys=on';
explain
select min(l_orderkey) from lineitem where l_shipdate='1992-07-01';
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Select tables optimized away
flush status;
select min(l_orderkey) from lineitem where l_shipdate='1992-07-01';
min(l_orderkey)
130
show status like 'handler_read%';
Variable_name Value
Handler_read_first 0
Handler_read_key 1
2012-03-03 00:03:20 +01:00
Handler_read_last 0
2011-12-31 11:25:57 +01:00
Handler_read_next 0
Handler_read_prev 0
Handler_read_rnd 0
2012-01-25 06:12:02 +01:00
Handler_read_rnd_deleted 0
2011-12-31 11:25:57 +01:00
Handler_read_rnd_next 0
set optimizer_switch='extended_keys=off';
explain
select min(l_orderkey) from lineitem
where l_shipdate='1992-07-01' and l_orderkey between 1001 and 2000;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE lineitem ref PRIMARY,i_l_shipdate,i_l_orderkey,i_l_orderkey_quantity i_l_shipdate 4 const 6 Using where; Using index
flush status;
select min(l_orderkey) from lineitem
where l_shipdate='1992-07-01' and l_orderkey between 1001 and 2000;
min(l_orderkey)
1088
show status like 'handler_read%';
Variable_name Value
Handler_read_first 0
Handler_read_key 1
2012-03-03 00:03:20 +01:00
Handler_read_last 0
2011-12-31 11:25:57 +01:00
Handler_read_next 6
Handler_read_prev 0
Handler_read_rnd 0
2012-01-25 06:12:02 +01:00
Handler_read_rnd_deleted 0
2011-12-31 11:25:57 +01:00
Handler_read_rnd_next 0
set optimizer_switch='extended_keys=on';
explain
select min(l_orderkey) from lineitem
where l_shipdate='1992-07-01' and l_orderkey between 1001 and 2000;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Select tables optimized away
flush status;
select min(l_orderkey) from lineitem
where l_shipdate='1992-07-01' and l_orderkey between 1001 and 2000;
min(l_orderkey)
1088
show status like 'handler_read%';
Variable_name Value
Handler_read_first 0
Handler_read_key 1
2012-03-03 00:03:20 +01:00
Handler_read_last 0
2011-12-31 11:25:57 +01:00
Handler_read_next 0
Handler_read_prev 0
Handler_read_rnd 0
2012-01-25 06:12:02 +01:00
Handler_read_rnd_deleted 0
2011-12-31 11:25:57 +01:00
Handler_read_rnd_next 0
set optimizer_switch='extended_keys=off';
explain
select max(l_linenumber) from lineitem
where l_shipdate='1992-07-01' and l_orderkey=130;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE lineitem ref PRIMARY,i_l_shipdate,i_l_orderkey,i_l_orderkey_quantity PRIMARY 4 const 5 Using where
flush status;
select max(l_linenumber) from lineitem
where l_shipdate='1992-07-01' and l_orderkey=130;
max(l_linenumber)
2
show status like 'handler_read%';
Variable_name Value
Handler_read_first 0
Handler_read_key 1
2012-03-03 00:03:20 +01:00
Handler_read_last 0
2011-12-31 11:25:57 +01:00
Handler_read_next 5
Handler_read_prev 0
Handler_read_rnd 0
2012-01-25 06:12:02 +01:00
Handler_read_rnd_deleted 0
2011-12-31 11:25:57 +01:00
Handler_read_rnd_next 0
set optimizer_switch='extended_keys=on';
explain
select max(l_linenumber) from lineitem
where l_shipdate='1992-07-01' and l_orderkey=130;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Select tables optimized away
flush status;
select max(l_linenumber) from lineitem
where l_shipdate='1992-07-01' and l_orderkey=130;
max(l_linenumber)
2
show status like 'handler_read%';
Variable_name Value
Handler_read_first 0
Handler_read_key 1
2012-03-03 00:03:20 +01:00
Handler_read_last 0
2011-12-31 11:25:57 +01:00
Handler_read_next 0
Handler_read_prev 0
Handler_read_rnd 0
2012-01-25 06:12:02 +01:00
Handler_read_rnd_deleted 0
2011-12-31 11:25:57 +01:00
Handler_read_rnd_next 0
set optimizer_switch='extended_keys=off';
explain
select l_orderkey, l_linenumber
from lineitem use index (i_l_shipdate, i_l_receiptdate)
where l_shipdate='1992-07-01' and l_orderkey=130
or l_receiptdate='1992-07-01' and l_orderkey=5603;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE lineitem index_merge i_l_shipdate,i_l_receiptdate i_l_shipdate,i_l_receiptdate 4,4 NULL 9 Using union(i_l_shipdate,i_l_receiptdate); Using where
flush status;
select l_orderkey, l_linenumber
from lineitem use index (i_l_shipdate, i_l_receiptdate)
where l_shipdate='1992-07-01' and l_orderkey=130
or l_receiptdate='1992-07-01' and l_orderkey=5603;
l_orderkey l_linenumber
130 2
5603 2
show status like 'handler_read%';
Variable_name Value
Handler_read_first 0
Handler_read_key 2
2012-03-03 00:03:20 +01:00
Handler_read_last 0
2011-12-31 11:25:57 +01:00
Handler_read_next 9
Handler_read_prev 0
Handler_read_rnd 9
2012-01-25 06:12:02 +01:00
Handler_read_rnd_deleted 0
2011-12-31 11:25:57 +01:00
Handler_read_rnd_next 0
set optimizer_switch='extended_keys=on';
explain
select l_orderkey, l_linenumber
from lineitem use index (i_l_shipdate, i_l_receiptdate)
where l_shipdate='1992-07-01' and l_orderkey=130
or l_receiptdate='1992-07-01' and l_orderkey=5603;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE lineitem index_merge i_l_shipdate,i_l_receiptdate i_l_shipdate,i_l_receiptdate 8,8 NULL 2 Using sort_union(i_l_shipdate,i_l_receiptdate); Using where
flush status;
select l_orderkey, l_linenumber
from lineitem use index (i_l_shipdate, i_l_receiptdate)
where l_shipdate='1992-07-01' and l_orderkey=130
or l_receiptdate='1992-07-01' and l_orderkey=5603;
l_orderkey l_linenumber
130 2
5603 2
show status like 'handler_read%';
Variable_name Value
Handler_read_first 0
Handler_read_key 2
2012-03-03 00:03:20 +01:00
Handler_read_last 0
2011-12-31 11:25:57 +01:00
Handler_read_next 2
Handler_read_prev 0
Handler_read_rnd 2
2012-01-25 06:12:02 +01:00
Handler_read_rnd_deleted 0
2011-12-31 11:25:57 +01:00
Handler_read_rnd_next 0
set optimizer_switch='extended_keys=off';
explain
select l_orderkey, l_linenumber
from lineitem use index (i_l_shipdate, i_l_receiptdate)
where l_shipdate='1992-07-01' and l_orderkey between 1 and 1000
or l_receiptdate='1992-07-01' and l_orderkey between 5001 and 6000;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE lineitem index_merge i_l_shipdate,i_l_receiptdate i_l_shipdate,i_l_receiptdate 4,4 NULL 9 Using union(i_l_shipdate,i_l_receiptdate); Using where
flush status;
select l_orderkey, l_linenumber
from lineitem use index (i_l_shipdate, i_l_receiptdate)
where l_shipdate='1992-07-01' and l_orderkey between 1 and 1000
or l_receiptdate='1992-07-01' and l_orderkey between 5001 and 6000;
l_orderkey l_linenumber
130 2
5603 2
5959 3
show status like 'handler_read%';
Variable_name Value
Handler_read_first 0
Handler_read_key 2
2012-03-03 00:03:20 +01:00
Handler_read_last 0
2011-12-31 11:25:57 +01:00
Handler_read_next 9
Handler_read_prev 0
Handler_read_rnd 9
2012-01-25 06:12:02 +01:00
Handler_read_rnd_deleted 0
2011-12-31 11:25:57 +01:00
Handler_read_rnd_next 0
set optimizer_switch='extended_keys=on';
explain
select l_orderkey, l_linenumber
from lineitem use index (i_l_shipdate, i_l_receiptdate)
where l_shipdate='1992-07-01' and l_orderkey between 1 and 1000
or l_receiptdate='1992-07-01' and l_orderkey between 5001 and 6000;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE lineitem index_merge i_l_shipdate,i_l_receiptdate i_l_shipdate,i_l_receiptdate 8,8 NULL 3 Using sort_union(i_l_shipdate,i_l_receiptdate); Using where
flush status;
select l_orderkey, l_linenumber
from lineitem use index (i_l_shipdate, i_l_receiptdate)
where l_shipdate='1992-07-01' and l_orderkey between 1 and 1000
or l_receiptdate='1992-07-01' and l_orderkey between 5001 and 6000;
l_orderkey l_linenumber
130 2
5603 2
5959 3
show status like 'handler_read%';
Variable_name Value
Handler_read_first 0
Handler_read_key 2
2012-03-03 00:03:20 +01:00
Handler_read_last 0
2011-12-31 11:25:57 +01:00
Handler_read_next 3
Handler_read_prev 0
Handler_read_rnd 3
2012-01-25 06:12:02 +01:00
Handler_read_rnd_deleted 0
2011-12-31 11:25:57 +01:00
Handler_read_rnd_next 0
set optimizer_switch='extended_keys=off';
explain
select l_orderkey, l_linenumber from lineitem
where l_shipdate='1992-07-01' and l_orderkey between 1 and 1000
or l_receiptdate='1992-07-01' and l_orderkey between 5001 and 6000;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE lineitem index_merge PRIMARY,i_l_shipdate,i_l_receiptdate,i_l_orderkey,i_l_orderkey_quantity i_l_shipdate,PRIMARY,i_l_receiptdate,PRIMARY 4,4,4,4 NULL 2 Using union(intersect(i_l_shipdate,PRIMARY),intersect(i_l_receiptdate,PRIMARY)); Using where
flush status;
select l_orderkey, l_linenumber from lineitem
where l_shipdate='1992-07-01' and l_orderkey between 1 and 1000
or l_receiptdate='1992-07-01' and l_orderkey between 5001 and 6000;
l_orderkey l_linenumber
130 2
5603 2
5959 3
show status like 'handler_read%';
Variable_name Value
Handler_read_first 0
Handler_read_key 2
2012-03-03 00:03:20 +01:00
Handler_read_last 0
2011-12-31 11:25:57 +01:00
Handler_read_next 9
Handler_read_prev 0
Handler_read_rnd 3
2012-01-25 06:12:02 +01:00
Handler_read_rnd_deleted 0
2011-12-31 11:25:57 +01:00
Handler_read_rnd_next 0
set optimizer_switch='extended_keys=on';
explain
select l_orderkey, l_linenumber from lineitem
where l_shipdate='1992-07-01' and l_orderkey between 1 and 1000
or l_receiptdate='1992-07-01' and l_orderkey between 5001 and 6000;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE lineitem index_merge PRIMARY,i_l_shipdate,i_l_receiptdate,i_l_orderkey,i_l_orderkey_quantity i_l_shipdate,i_l_receiptdate 8,8 NULL 3 Using sort_union(i_l_shipdate,i_l_receiptdate); Using where
flush status;
select l_orderkey, l_linenumber from lineitem
where l_shipdate='1992-07-01' and l_orderkey between 1 and 1000
or l_receiptdate='1992-07-01' and l_orderkey between 5001 and 6000;
l_orderkey l_linenumber
130 2
5603 2
5959 3
show status like 'handler_read%';
Variable_name Value
Handler_read_first 0
Handler_read_key 2
2012-03-03 00:03:20 +01:00
Handler_read_last 0
2011-12-31 11:25:57 +01:00
Handler_read_next 3
Handler_read_prev 0
Handler_read_rnd 3
2012-01-25 06:12:02 +01:00
Handler_read_rnd_deleted 0
2011-12-31 11:25:57 +01:00
Handler_read_rnd_next 0
set optimizer_switch='extended_keys=off';
explain
select max(l_orderkey) from lineitem
where l_partkey between 1 and 10 group by l_partkey;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE lineitem range i_l_suppkey_partkey,i_l_partkey i_l_partkey 5 NULL # Using where; Using index
flush status;
select max(l_orderkey) from lineitem
where l_partkey between 1 and 10 group by l_partkey;
max(l_orderkey)
5984
5957
5892
5856
5959
5957
5794
5894
5859
5632
show status like 'handler_read%';
Variable_name Value
Handler_read_first 0
Handler_read_key 1
2012-03-03 00:03:20 +01:00
Handler_read_last 0
2011-12-31 11:25:57 +01:00
Handler_read_next 294
Handler_read_prev 0
Handler_read_rnd 0
2012-01-25 06:12:02 +01:00
Handler_read_rnd_deleted 0
2011-12-31 11:25:57 +01:00
Handler_read_rnd_next 0
set optimizer_switch='extended_keys=on';
explain
select max(l_orderkey) from lineitem
where l_partkey between 1 and 10 group by l_partkey;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE lineitem range i_l_suppkey_partkey,i_l_partkey i_l_partkey 5 NULL # Using where; Using index for group-by
flush status;
select max(l_orderkey) from lineitem
where l_partkey between 1 and 10 group by l_partkey;
max(l_orderkey)
5984
5957
5892
5856
5959
5957
5794
5894
5859
5632
show status like 'handler_read%';
Variable_name Value
Handler_read_first 0
Handler_read_key 21
2012-03-03 00:03:20 +01:00
Handler_read_last 1
2011-12-31 11:25:57 +01:00
Handler_read_next 0
Handler_read_prev 0
Handler_read_rnd 0
2012-01-25 06:12:02 +01:00
Handler_read_rnd_deleted 0
2011-12-31 11:25:57 +01:00
Handler_read_rnd_next 0
set optimizer_switch='extended_keys=off';
explain
select max(l_orderkey) from lineitem
where l_suppkey in (1,4) group by l_suppkey;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE lineitem range i_l_suppkey i_l_suppkey 5 NULL # Using where; Using index
flush status;
select max(l_orderkey) from lineitem
where l_suppkey in (1,4) group by l_suppkey;
max(l_orderkey)
5988
5984
show status like 'handler_read%';
Variable_name Value
Handler_read_first 0
Handler_read_key 2
2012-03-03 00:03:20 +01:00
Handler_read_last 0
2011-12-31 11:25:57 +01:00
Handler_read_next 1230
Handler_read_prev 0
Handler_read_rnd 0
2012-01-25 06:12:02 +01:00
Handler_read_rnd_deleted 0
2011-12-31 11:25:57 +01:00
Handler_read_rnd_next 0
set optimizer_switch='extended_keys=on';
explain
select max(l_orderkey) from lineitem
where l_suppkey in (1,4) group by l_suppkey;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE lineitem range i_l_suppkey i_l_suppkey 5 NULL # Using where; Using index for group-by
flush status;
select max(l_orderkey) from lineitem
where l_suppkey in (1,4) group by l_suppkey;
max(l_orderkey)
5988
5984
show status like 'handler_read%';
Variable_name Value
Handler_read_first 0
Handler_read_key 6
2012-03-03 00:03:20 +01:00
Handler_read_last 1
2011-12-31 11:25:57 +01:00
Handler_read_next 0
Handler_read_prev 0
Handler_read_rnd 0
2012-01-25 06:12:02 +01:00
Handler_read_rnd_deleted 0
2011-12-31 11:25:57 +01:00
Handler_read_rnd_next 0
create index i_p_retailprice on part(p_retailprice);
set optimizer_switch='extended_keys=off';
explain
select o_orderkey, p_partkey
from part use index (i_p_retailprice),
lineitem use index (i_l_partkey), orders
where p_retailprice > 1100 and o_orderdate='1997-01-01'
and o_orderkey=l_orderkey and p_partkey=l_partkey;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE part range i_p_retailprice i_p_retailprice 9 NULL # Using where; Using index
1 SIMPLE orders ref PRIMARY,i_o_orderdate i_o_orderdate 4 const # Using index
1 SIMPLE lineitem ref i_l_partkey i_l_partkey 5 dbt3_s001.part.p_partkey # Using where; Using index
flush status;
select o_orderkey, p_partkey
from part use index (i_p_retailprice),
lineitem use index (i_l_partkey), orders
where p_retailprice > 1100 and o_orderdate='1997-01-01'
and o_orderkey=l_orderkey and p_partkey=l_partkey;
o_orderkey p_partkey
5895 200
show status like 'handler_read%';
Variable_name Value
Handler_read_first 0
Handler_read_key 3
2012-03-03 00:03:20 +01:00
Handler_read_last 0
2011-12-31 11:25:57 +01:00
Handler_read_next 26
Handler_read_prev 0
Handler_read_rnd 0
2012-01-25 06:12:02 +01:00
Handler_read_rnd_deleted 0
2011-12-31 11:25:57 +01:00
Handler_read_rnd_next 0
set optimizer_switch='extended_keys=on';
explain
select o_orderkey, p_partkey
from part use index (i_p_retailprice),
lineitem use index (i_l_partkey), orders
where p_retailprice > 1100 and o_orderdate='1997-01-01'
and o_orderkey=l_orderkey and p_partkey=l_partkey;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE part range i_p_retailprice i_p_retailprice 9 NULL # Using where; Using index
1 SIMPLE orders ref PRIMARY,i_o_orderdate i_o_orderdate 4 const # Using index
1 SIMPLE lineitem ref i_l_partkey i_l_partkey 9 dbt3_s001.part.p_partkey,dbt3_s001.orders.o_orderkey # Using index
flush status;
select o_orderkey, p_partkey
from part use index (i_p_retailprice),
lineitem use index (i_l_partkey), orders
where p_retailprice > 1100 and o_orderdate='1997-01-01'
and o_orderkey=l_orderkey and p_partkey=l_partkey;
o_orderkey p_partkey
5895 200
show status like 'handler_read%';
Variable_name Value
Handler_read_first 0
Handler_read_key 3
2012-03-03 00:03:20 +01:00
Handler_read_last 0
2011-12-31 11:25:57 +01:00
Handler_read_next 3
Handler_read_prev 0
Handler_read_rnd 0
2012-01-25 06:12:02 +01:00
Handler_read_rnd_deleted 0
2011-12-31 11:25:57 +01:00
Handler_read_rnd_next 0
DROP DATABASE dbt3_s001;
2012-01-17 12:26:49 +01:00
use test;
#
# LP Bug #914560: query containing IN subquery
# + extended_keys = on
#
set @save_optimizer_switch=@@optimizer_switch;
SET optimizer_switch='materialization=on,semijoin=on';
SET optimizer_switch='extended_keys=on';
CREATE TABLE t1 (a int, b int) ENGINE=MyISAM;
INSERT INTO t1 VALUES (1,1), (2,2);
SELECT * FROM t1 WHERE 2 IN (SELECT MAX(s1.a) FROM t1 AS s1, t1 AS s2);
a b
1 1
2 2
EXPLAIN
SELECT * FROM t1 WHERE 2 IN (SELECT MAX(s1.a) FROM t1 AS s1, t1 AS s2);
id select_type table type possible_keys key key_len ref rows Extra
2012-02-28 06:23:12 +01:00
1 PRIMARY <subquery2> const distinct_key distinct_key 4 const 1
2012-01-17 12:26:49 +01:00
1 PRIMARY t1 ALL NULL NULL NULL NULL 2 Using join buffer (flat, BNL join)
2 MATERIALIZED s1 ALL NULL NULL NULL NULL 2
2 MATERIALIZED s2 ALL NULL NULL NULL NULL 2 Using join buffer (flat, BNL join)
DROP TABLE t1;
set optimizer_switch=@save_optimizer_switch;
2012-01-19 04:38:03 +01:00
#
# LP Bug #915291: query using a materialized view
# + extended_keys = on
# (valgrinf complains fixed by the patch for bug #914560)
#
set @save_optimizer_switch=@@optimizer_switch;
SET optimizer_switch = 'derived_with_keys=on';
SET optimizer_switch = 'extended_keys=on';
CREATE TABLE t1 (a varchar(1)) ENGINE=MyISAM;
INSERT INTO t1 VALUES ('j'), ('v');
CREATE TABLE t2 (b varchar(1)) ENGINE=MyISAM;
INSERT INTO t2 VALUES ('j'), ('v');
CREATE TABLE t3 (c varchar(1));
INSERT INTO t2 VALUES ('m'), ('n');
CREATE VIEW v
AS SELECT DISTINCT * FROM t2 STRAIGHT_JOIN t3;
SELECT * FROM t1, v WHERE a = b;
a b c
DROP VIEW v;
DROP TABLE t1,t2,t3;
set optimizer_switch=@save_optimizer_switch;
2012-01-25 08:34:02 +01:00
#
# LP Bug #921167: query containing IN subquery
# + extended_keys = on
#
CREATE TABLE t1 (
a int NOT NULL, b varchar(1) NOT NULL, KEY(a), KEY(b,a)
) ENGINE=MyISAM;
INSERT INTO t1 VALUES
(0,'j'), (8,'v'), (1,'c'), (8,'m'), (9,'d'),
(24,'d'), (6,'y'), (1,'t'), (6,'d'), (2,'s');
CREATE TABLE t2 (
c int NOT NULL PRIMARY KEY
) ENGINE=MyISAM;
INSERT INTO t2 VALUES
(10), (11), (12), (13), (14),
(15), (16), (17), (18), (19), (24);
set @save_optimizer_switch=@@optimizer_switch;
SET optimizer_switch = 'extended_keys=off';
EXPLAIN
SELECT a FROM t1 AS t, t2
WHERE c = a AND b IN (SELECT b FROM t1, t2 WHERE b = t.b);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t index a,b b 7 NULL 10 Using index
2012-03-28 20:25:31 +02:00
1 PRIMARY t1 ref b b 3 test.t.b 2 Using index
1 PRIMARY t2 index NULL PRIMARY 4 NULL 11 Using index; FirstMatch(t)
2012-01-25 08:34:02 +01:00
1 PRIMARY t2 eq_ref PRIMARY PRIMARY 4 test.t.a 1 Using index
SELECT a FROM t1 AS t, t2
WHERE c = a AND b IN (SELECT b FROM t1, t2 WHERE b = t.b);
a
24
SET optimizer_switch = 'extended_keys=on';
EXPLAIN
SELECT a FROM t1 AS t, t2
WHERE c = a AND b IN (SELECT b FROM t1, t2 WHERE b = t.b);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t index a,b b 7 NULL 10 Using index
2012-03-28 20:25:31 +02:00
1 PRIMARY t1 ref b b 3 test.t.b 2 Using index
1 PRIMARY t2 index NULL PRIMARY 4 NULL 11 Using index; FirstMatch(t)
2012-01-25 08:34:02 +01:00
1 PRIMARY t2 eq_ref PRIMARY PRIMARY 4 test.t.a 1 Using index
SELECT a FROM t1 AS t, t2
WHERE c = a AND b IN (SELECT b FROM t1, t2 WHERE b = t.b);
a
24
set optimizer_switch=@save_optimizer_switch;
DROP TABLE t1,t2;
2012-01-29 23:35:30 +01:00
#
# LP Bug #923236: hash join + extended_keys = on
#
CREATE TABLE t1 (a int) ENGINE=MyISAM;
CREATE TABLE t2 (b int) ENGINE=MyISAM;
INSERT INTO t1 (a) VALUES (4), (6);
INSERT INTO t2 (b) VALUES (0), (8);
set @save_optimizer_switch=@@optimizer_switch;
SET join_cache_level=3;
SET optimizer_switch='join_cache_hashed=on';
SET optimizer_switch='join_cache_bka=on';
SET optimizer_switch='extended_keys=on';
EXPLAIN
SELECT * FROM t1, t2 WHERE b=a;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 2 Using where
1 SIMPLE t2 hash_ALL NULL #hash#$hj 5 test.t1.a 2 Using where; Using join buffer (flat, BNLH join)
SELECT * FROM t1, t2 WHERE b=a;
a b
set optimizer_switch=@save_optimizer_switch;
DROP TABLE t1,t2;
2012-01-17 12:26:49 +01:00
set optimizer_switch=@save_ext_key_optimizer_switch;
2011-12-31 11:25:57 +01:00
SET SESSION STORAGE_ENGINE=DEFAULT;
