mirror of
https://github.com/MariaDB/server.git
synced 2025-10-30 04:26:45 +03:00
729 lines
24 KiB
Plaintext
729 lines
24 KiB
Plaintext
DROP TABLE IF EXISTS t1,t2,t3,t4;
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DROP DATABASE IF EXISTS dbt3_s001;
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SET SESSION STORAGE_ENGINE='InnoDB';
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CREATE DATABASE dbt3_s001;
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use dbt3_s001;
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set @save_ext_key_optimizer_switch=@@optimizer_switch;
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set optimizer_switch='extended_keys=off';
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explain
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select count(*) from lineitem where l_orderkey=130 and l_shipdate='1992-07-01';
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE lineitem ref PRIMARY,i_l_shipdate,i_l_orderkey,i_l_orderkey_quantity PRIMARY 4 const 5 Using where
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flush status;
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select count(*) from lineitem where l_orderkey=130 and l_shipdate='1992-07-01';
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count(*)
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1
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show status like 'handler_read%';
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Variable_name Value
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Handler_read_first 0
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Handler_read_key 1
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Handler_read_last 0
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Handler_read_next 5
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Handler_read_prev 0
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Handler_read_rnd 0
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Handler_read_rnd_deleted 0
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Handler_read_rnd_next 0
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set optimizer_switch='extended_keys=on';
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explain
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select count(*) from lineitem where l_orderkey=130 and l_shipdate='1992-07-01';
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE lineitem ref PRIMARY,i_l_shipdate,i_l_orderkey,i_l_orderkey_quantity i_l_shipdate 8 const,const 1 Using index
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flush status;
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select count(*) from lineitem where l_orderkey=130 and l_shipdate='1992-07-01';
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count(*)
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1
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show status like 'handler_read%';
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Variable_name Value
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Handler_read_first 0
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Handler_read_key 1
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Handler_read_last 0
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Handler_read_next 1
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Handler_read_prev 0
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Handler_read_rnd 0
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Handler_read_rnd_deleted 0
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Handler_read_rnd_next 0
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set optimizer_switch='extended_keys=off';
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explain
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select count(*) from lineitem
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where l_orderkey=130 and l_linenumber=2 and l_shipdate='1992-07-01';
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE lineitem const PRIMARY,i_l_shipdate,i_l_orderkey,i_l_orderkey_quantity PRIMARY 8 const,const 1
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flush status;
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select count(*) from lineitem
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where l_orderkey=130 and l_linenumber=2 and l_shipdate='1992-07-01';
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count(*)
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1
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show status like 'handler_read%';
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Variable_name Value
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Handler_read_first 0
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Handler_read_key 1
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Handler_read_last 0
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Handler_read_next 0
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Handler_read_prev 0
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Handler_read_rnd 0
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Handler_read_rnd_deleted 0
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Handler_read_rnd_next 0
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set optimizer_switch='extended_keys=on';
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explain
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select count(*) from lineitem
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where l_orderkey=130 and l_linenumber=2 and l_shipdate='1992-07-01';
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE lineitem const PRIMARY,i_l_shipdate,i_l_orderkey,i_l_orderkey_quantity PRIMARY 8 const,const 1
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flush status;
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select count(*) from lineitem
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where l_orderkey=130 and l_linenumber=2 and l_shipdate='1992-07-01';
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count(*)
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1
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show status like 'handler_read%';
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Variable_name Value
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Handler_read_first 0
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Handler_read_key 1
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Handler_read_last 0
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Handler_read_next 0
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Handler_read_prev 0
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Handler_read_rnd 0
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Handler_read_rnd_deleted 0
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Handler_read_rnd_next 0
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set optimizer_switch='extended_keys=off';
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explain
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select count(*) from lineitem
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where l_shipdate='1992-07-01' and l_orderkey between 1 and 1000;
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id select_type table type possible_keys key key_len ref rows Extra
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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
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flush status;
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select count(*) from lineitem
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where l_shipdate='1992-07-01' and l_orderkey between 1 and 1000;
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count(*)
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1
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show status like 'handler_read%';
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Variable_name Value
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Handler_read_first 0
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Handler_read_key 1
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Handler_read_last 0
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Handler_read_next 6
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Handler_read_prev 0
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Handler_read_rnd 0
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Handler_read_rnd_deleted 0
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Handler_read_rnd_next 0
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set optimizer_switch='extended_keys=on';
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explain
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select count(*) from lineitem
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where l_shipdate='1992-07-01' and l_orderkey between 1 and 1000;
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id select_type table type possible_keys key key_len ref rows Extra
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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
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flush status;
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select count(*) from lineitem
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where l_shipdate='1992-07-01' and l_orderkey between 1 and 1000;
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count(*)
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1
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show status like 'handler_read%';
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Variable_name Value
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Handler_read_first 0
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Handler_read_key 1
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Handler_read_last 0
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Handler_read_next 1
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Handler_read_prev 0
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Handler_read_rnd 0
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Handler_read_rnd_deleted 0
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Handler_read_rnd_next 0
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set optimizer_switch='extended_keys=off';
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explain
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select l_orderkey, l_linenumber from lineitem
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where l_shipdate='1992-07-01' and l_orderkey between 1001 and 2000;
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id select_type table type possible_keys key key_len ref rows Extra
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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
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flush status;
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select l_orderkey, l_linenumber from lineitem
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where l_shipdate='1992-07-01' and l_orderkey between 1001 and 2000;
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l_orderkey l_linenumber
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1088 3
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1217 1
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1221 3
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show status like 'handler_read%';
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Variable_name Value
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Handler_read_first 0
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Handler_read_key 1
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Handler_read_last 0
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Handler_read_next 6
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Handler_read_prev 0
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Handler_read_rnd 0
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Handler_read_rnd_deleted 0
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Handler_read_rnd_next 0
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set optimizer_switch='extended_keys=on';
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explain
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select l_orderkey, l_linenumber from lineitem
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where l_shipdate='1992-07-01' and l_orderkey between 1001 and 2000;
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id select_type table type possible_keys key key_len ref rows Extra
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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
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flush status;
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select l_orderkey, l_linenumber from lineitem
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where l_shipdate='1992-07-01' and l_orderkey between 1001 and 2000;
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l_orderkey l_linenumber
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1088 3
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1217 1
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1221 3
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show status like 'handler_read%';
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Variable_name Value
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Handler_read_first 0
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Handler_read_key 1
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Handler_read_last 0
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Handler_read_next 3
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Handler_read_prev 0
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Handler_read_rnd 0
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Handler_read_rnd_deleted 0
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Handler_read_rnd_next 0
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set optimizer_switch='extended_keys=off';
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explain
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select min(l_orderkey) from lineitem where l_shipdate='1992-07-01';
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE lineitem ref i_l_shipdate i_l_shipdate 4 const 6 Using index
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flush status;
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select min(l_orderkey) from lineitem where l_shipdate='1992-07-01';
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min(l_orderkey)
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130
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show status like 'handler_read%';
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Variable_name Value
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Handler_read_first 0
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Handler_read_key 1
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Handler_read_last 0
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Handler_read_next 6
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Handler_read_prev 0
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Handler_read_rnd 0
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Handler_read_rnd_deleted 0
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Handler_read_rnd_next 0
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set optimizer_switch='extended_keys=on';
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explain
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select min(l_orderkey) from lineitem where l_shipdate='1992-07-01';
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Select tables optimized away
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flush status;
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select min(l_orderkey) from lineitem where l_shipdate='1992-07-01';
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min(l_orderkey)
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130
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show status like 'handler_read%';
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Variable_name Value
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Handler_read_first 0
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Handler_read_key 1
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Handler_read_last 0
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Handler_read_next 0
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Handler_read_prev 0
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Handler_read_rnd 0
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Handler_read_rnd_deleted 0
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Handler_read_rnd_next 0
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set optimizer_switch='extended_keys=off';
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explain
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select min(l_orderkey) from lineitem
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where l_shipdate='1992-07-01' and l_orderkey between 1001 and 2000;
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id select_type table type possible_keys key key_len ref rows Extra
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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
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flush status;
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select min(l_orderkey) from lineitem
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where l_shipdate='1992-07-01' and l_orderkey between 1001 and 2000;
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min(l_orderkey)
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1088
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show status like 'handler_read%';
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Variable_name Value
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Handler_read_first 0
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Handler_read_key 1
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Handler_read_last 0
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Handler_read_next 6
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Handler_read_prev 0
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Handler_read_rnd 0
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Handler_read_rnd_deleted 0
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Handler_read_rnd_next 0
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set optimizer_switch='extended_keys=on';
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explain
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select min(l_orderkey) from lineitem
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where l_shipdate='1992-07-01' and l_orderkey between 1001 and 2000;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Select tables optimized away
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flush status;
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select min(l_orderkey) from lineitem
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where l_shipdate='1992-07-01' and l_orderkey between 1001 and 2000;
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min(l_orderkey)
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1088
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show status like 'handler_read%';
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Variable_name Value
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Handler_read_first 0
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Handler_read_key 1
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Handler_read_last 0
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Handler_read_next 0
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Handler_read_prev 0
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Handler_read_rnd 0
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Handler_read_rnd_deleted 0
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Handler_read_rnd_next 0
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set optimizer_switch='extended_keys=off';
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explain
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select max(l_linenumber) from lineitem
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where l_shipdate='1992-07-01' and l_orderkey=130;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE lineitem ref PRIMARY,i_l_shipdate,i_l_orderkey,i_l_orderkey_quantity PRIMARY 4 const 5 Using where
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flush status;
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select max(l_linenumber) from lineitem
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where l_shipdate='1992-07-01' and l_orderkey=130;
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max(l_linenumber)
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2
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show status like 'handler_read%';
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Variable_name Value
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Handler_read_first 0
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Handler_read_key 1
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Handler_read_last 0
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Handler_read_next 5
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Handler_read_prev 0
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Handler_read_rnd 0
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Handler_read_rnd_deleted 0
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Handler_read_rnd_next 0
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set optimizer_switch='extended_keys=on';
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explain
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select max(l_linenumber) from lineitem
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where l_shipdate='1992-07-01' and l_orderkey=130;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Select tables optimized away
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flush status;
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select max(l_linenumber) from lineitem
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where l_shipdate='1992-07-01' and l_orderkey=130;
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max(l_linenumber)
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2
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show status like 'handler_read%';
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Variable_name Value
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Handler_read_first 0
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Handler_read_key 1
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Handler_read_last 0
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Handler_read_next 0
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Handler_read_prev 0
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Handler_read_rnd 0
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Handler_read_rnd_deleted 0
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Handler_read_rnd_next 0
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set optimizer_switch='extended_keys=off';
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explain
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select l_orderkey, l_linenumber
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from lineitem use index (i_l_shipdate, i_l_receiptdate)
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where l_shipdate='1992-07-01' and l_orderkey=130
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or l_receiptdate='1992-07-01' and l_orderkey=5603;
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id select_type table type possible_keys key key_len ref rows Extra
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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
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flush status;
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select l_orderkey, l_linenumber
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from lineitem use index (i_l_shipdate, i_l_receiptdate)
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where l_shipdate='1992-07-01' and l_orderkey=130
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or l_receiptdate='1992-07-01' and l_orderkey=5603;
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l_orderkey l_linenumber
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130 2
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5603 2
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show status like 'handler_read%';
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Variable_name Value
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Handler_read_first 0
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Handler_read_key 2
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Handler_read_last 0
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Handler_read_next 9
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Handler_read_prev 0
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Handler_read_rnd 9
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Handler_read_rnd_deleted 0
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Handler_read_rnd_next 0
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set optimizer_switch='extended_keys=on';
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explain
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select l_orderkey, l_linenumber
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from lineitem use index (i_l_shipdate, i_l_receiptdate)
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where l_shipdate='1992-07-01' and l_orderkey=130
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or l_receiptdate='1992-07-01' and l_orderkey=5603;
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id select_type table type possible_keys key key_len ref rows Extra
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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
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flush status;
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select l_orderkey, l_linenumber
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from lineitem use index (i_l_shipdate, i_l_receiptdate)
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where l_shipdate='1992-07-01' and l_orderkey=130
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or l_receiptdate='1992-07-01' and l_orderkey=5603;
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l_orderkey l_linenumber
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130 2
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5603 2
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show status like 'handler_read%';
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Variable_name Value
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Handler_read_first 0
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Handler_read_key 2
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Handler_read_last 0
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Handler_read_next 2
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Handler_read_prev 0
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Handler_read_rnd 2
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Handler_read_rnd_deleted 0
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Handler_read_rnd_next 0
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set optimizer_switch='extended_keys=off';
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explain
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select l_orderkey, l_linenumber
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from lineitem use index (i_l_shipdate, i_l_receiptdate)
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where l_shipdate='1992-07-01' and l_orderkey between 1 and 1000
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or l_receiptdate='1992-07-01' and l_orderkey between 5001 and 6000;
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id select_type table type possible_keys key key_len ref rows Extra
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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
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flush status;
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select l_orderkey, l_linenumber
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from lineitem use index (i_l_shipdate, i_l_receiptdate)
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where l_shipdate='1992-07-01' and l_orderkey between 1 and 1000
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or l_receiptdate='1992-07-01' and l_orderkey between 5001 and 6000;
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l_orderkey l_linenumber
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130 2
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5603 2
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5959 3
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show status like 'handler_read%';
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Variable_name Value
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Handler_read_first 0
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Handler_read_key 2
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Handler_read_last 0
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Handler_read_next 9
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Handler_read_prev 0
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Handler_read_rnd 9
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Handler_read_rnd_deleted 0
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Handler_read_rnd_next 0
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set optimizer_switch='extended_keys=on';
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explain
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select l_orderkey, l_linenumber
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from lineitem use index (i_l_shipdate, i_l_receiptdate)
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where l_shipdate='1992-07-01' and l_orderkey between 1 and 1000
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or l_receiptdate='1992-07-01' and l_orderkey between 5001 and 6000;
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id select_type table type possible_keys key key_len ref rows Extra
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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
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flush status;
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select l_orderkey, l_linenumber
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from lineitem use index (i_l_shipdate, i_l_receiptdate)
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where l_shipdate='1992-07-01' and l_orderkey between 1 and 1000
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or l_receiptdate='1992-07-01' and l_orderkey between 5001 and 6000;
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l_orderkey l_linenumber
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130 2
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5603 2
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5959 3
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show status like 'handler_read%';
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Variable_name Value
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Handler_read_first 0
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Handler_read_key 2
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Handler_read_last 0
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Handler_read_next 3
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Handler_read_prev 0
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Handler_read_rnd 3
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Handler_read_rnd_deleted 0
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Handler_read_rnd_next 0
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set optimizer_switch='extended_keys=off';
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explain
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select l_orderkey, l_linenumber from lineitem
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where l_shipdate='1992-07-01' and l_orderkey between 1 and 1000
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or l_receiptdate='1992-07-01' and l_orderkey between 5001 and 6000;
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id select_type table type possible_keys key key_len ref rows Extra
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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
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flush status;
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select l_orderkey, l_linenumber from lineitem
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where l_shipdate='1992-07-01' and l_orderkey between 1 and 1000
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or l_receiptdate='1992-07-01' and l_orderkey between 5001 and 6000;
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l_orderkey l_linenumber
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130 2
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5603 2
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5959 3
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show status like 'handler_read%';
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Variable_name Value
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Handler_read_first 0
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Handler_read_key 2
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Handler_read_last 0
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Handler_read_next 9
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Handler_read_prev 0
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Handler_read_rnd 3
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Handler_read_rnd_deleted 0
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Handler_read_rnd_next 0
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set optimizer_switch='extended_keys=on';
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explain
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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
|
|
Handler_read_last 0
|
|
Handler_read_next 3
|
|
Handler_read_prev 0
|
|
Handler_read_rnd 3
|
|
Handler_read_rnd_deleted 0
|
|
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
|
|
Handler_read_last 0
|
|
Handler_read_next 294
|
|
Handler_read_prev 0
|
|
Handler_read_rnd 0
|
|
Handler_read_rnd_deleted 0
|
|
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
|
|
Handler_read_last 1
|
|
Handler_read_next 0
|
|
Handler_read_prev 0
|
|
Handler_read_rnd 0
|
|
Handler_read_rnd_deleted 0
|
|
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
|
|
Handler_read_last 0
|
|
Handler_read_next 1230
|
|
Handler_read_prev 0
|
|
Handler_read_rnd 0
|
|
Handler_read_rnd_deleted 0
|
|
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
|
|
Handler_read_last 1
|
|
Handler_read_next 0
|
|
Handler_read_prev 0
|
|
Handler_read_rnd 0
|
|
Handler_read_rnd_deleted 0
|
|
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
|
|
Handler_read_last 0
|
|
Handler_read_next 26
|
|
Handler_read_prev 0
|
|
Handler_read_rnd 0
|
|
Handler_read_rnd_deleted 0
|
|
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
|
|
Handler_read_last 0
|
|
Handler_read_next 3
|
|
Handler_read_prev 0
|
|
Handler_read_rnd 0
|
|
Handler_read_rnd_deleted 0
|
|
Handler_read_rnd_next 0
|
|
DROP DATABASE dbt3_s001;
|
|
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
|
|
1 PRIMARY <subquery2> const distinct_key distinct_key 4 const 1
|
|
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;
|
|
#
|
|
# 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;
|
|
#
|
|
# 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
|
|
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)
|
|
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
|
|
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)
|
|
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;
|
|
#
|
|
# 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;
|
|
set optimizer_switch=@save_ext_key_optimizer_switch;
|
|
SET SESSION STORAGE_ENGINE=DEFAULT;
|