mirror of
https://github.com/MariaDB/server.git
synced 2025-07-30 16:24:05 +03:00
Complete implementation of WL#1469 "Greedy algorithm to search for an optimal execution plan",
consisting of pos-review fixes and improvements.
mysql-test/r/distinct.result:
Adjusted to account for pre-sorting of tables before optimiziation.
mysql-test/r/func_group.result:
Adjusted to account for pre-sorting of tables before optimiziation.
mysql-test/r/greedy_optimizer.result:
- Adjusted to account for pre-sorting of tables before optimiziation.
- Removed unnecessary test.
- More comments.
mysql-test/r/select.result:
- Adjusted to account for pre-sorting of tables before optimiziation.
mysql-test/t/greedy_optimizer.test:
- Adjusted to account for pre-sorting of tables before optimiziation.
- Removed unnecessary test.
- More comments.
sql/mysql_priv.h:
Moved function print_plan() to sql_test.cc
sql/sql_select.cc:
- Simplified the recursion in best_extension_by_limited_search()
and aligned it with its pseudo-code.
- Renamed functions to better reflect their semantics.
- Post-review changes of function specifications.
- Moved function print_plan() to sql_test.cc.
sql/sql_test.cc:
Moved function print_plan() to sql_test.cc
This commit is contained in:
unknown
@ -114,6 +114,82 @@ select @@plan_search_depth;
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select @@heuristic;
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@@heuristic
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1
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set plan_search_depth=63;
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select @@plan_search_depth;
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@@plan_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 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 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 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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Variable_name Value
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Last_query_cost 821.838037
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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 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 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 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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Variable_name Value
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Last_query_cost 821.838037
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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 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 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 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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Variable_name Value
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Last_query_cost 794.838037
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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 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 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 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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Variable_name Value
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Last_query_cost 794.838037
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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 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 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 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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Variable_name Value
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Last_query_cost 794.838037
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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 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 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 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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Variable_name Value
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Last_query_cost 794.838037
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set heuristic=0;
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select @@heuristic;
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@@heuristic
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@ -136,13 +212,13 @@ Variable_name Value
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Last_query_cost 821.838037
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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 t6 ALL NULL NULL NULL NULL 18
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1 SIMPLE t1 ALL NULL NULL NULL NULL 3
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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 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 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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1 SIMPLE t4 ALL NULL NULL NULL NULL 12
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1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t4.c42 1 Using where
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1 SIMPLE t2 ALL NULL NULL NULL NULL 6
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1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t2.c22 1 Using where
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1 SIMPLE t1 ALL NULL NULL NULL NULL 3 Using where
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show status like 'Last_query_cost';
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Variable_name Value
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Last_query_cost 821.838037
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@ -160,12 +236,12 @@ Variable_name Value
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Last_query_cost 274.419727
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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 t6 ALL NULL NULL NULL NULL 18
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1 SIMPLE t4 ALL NULL NULL NULL NULL 12
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1 SIMPLE t2 ALL NULL NULL NULL NULL 6
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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 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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Variable_name Value
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@ -184,12 +260,12 @@ Variable_name Value
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Last_query_cost 274.419727
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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 t6 ALL NULL NULL NULL NULL 18
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1 SIMPLE t2 ALL NULL NULL NULL NULL 6
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1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where
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1 SIMPLE t2 ALL NULL NULL NULL NULL 6 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 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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Variable_name Value
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@ -237,8 +313,8 @@ Last_query_cost 794.838037
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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 t5 eq_ref PRIMARY PRIMARY 4 test.t1.c14 1 Using index
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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 t7 eq_ref PRIMARY PRIMARY 4 test.t1.c16 1 Using index
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1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using where
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1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where
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@ -261,8 +337,8 @@ Last_query_cost 794.838037
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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 t5 eq_ref PRIMARY PRIMARY 4 test.t1.c14 1
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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
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1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t1.c14 1 Using where
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1 SIMPLE t7 eq_ref PRIMARY PRIMARY 4 test.t1.c16 1 Using where
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1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using where
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1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where
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@ -288,70 +364,6 @@ Variable_name Value
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Last_query_cost 821.838037
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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 t6 ALL NULL NULL NULL NULL 18
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1 SIMPLE t7 eq_ref PRIMARY PRIMARY 4 test.t6.c62 1 Using index
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1 SIMPLE t4 ALL NULL NULL NULL NULL 12
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1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t4.c42 1 Using where
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1 SIMPLE t2 ALL NULL NULL NULL NULL 6
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1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t2.c22 1 Using where
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1 SIMPLE t1 ALL NULL NULL NULL NULL 3 Using where
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show status like 'Last_query_cost';
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Variable_name Value
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Last_query_cost 821.838037
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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 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 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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Variable_name Value
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Last_query_cost 274.419727
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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 t6 ALL NULL NULL NULL NULL 18
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1 SIMPLE t4 ALL NULL NULL NULL NULL 12
|
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1 SIMPLE t2 ALL NULL NULL NULL NULL 6
|
||||
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 t7 eq_ref PRIMARY PRIMARY 4 test.t1.c16 1 Using index
|
||||
show status like 'Last_query_cost';
|
||||
Variable_name Value
|
||||
Last_query_cost 274.419727
|
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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;
|
||||
id select_type table type possible_keys key key_len ref rows Extra
|
||||
1 SIMPLE t2 ALL NULL NULL NULL NULL 6
|
||||
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 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';
|
||||
Variable_name Value
|
||||
Last_query_cost 274.419727
|
||||
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 t6 ALL NULL NULL NULL NULL 18
|
||||
1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where
|
||||
1 SIMPLE t2 ALL NULL NULL NULL NULL 6 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 t7 eq_ref PRIMARY PRIMARY 4 test.t1.c16 1 Using where
|
||||
show status like 'Last_query_cost';
|
||||
Variable_name Value
|
||||
Last_query_cost 274.419727
|
||||
set plan_search_depth=63;
|
||||
select @@plan_search_depth;
|
||||
@@plan_search_depth
|
||||
63
|
||||
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 t2 ALL NULL NULL NULL NULL 6 Using where
|
||||
1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t2.c22 1
|
||||
@ -362,62 +374,50 @@ id select_type table type possible_keys key key_len ref rows Extra
|
||||
show status like 'Last_query_cost';
|
||||
Variable_name Value
|
||||
Last_query_cost 821.838037
|
||||
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 t6 ALL NULL NULL NULL NULL 18
|
||||
1 SIMPLE t7 eq_ref PRIMARY PRIMARY 4 test.t6.c62 1 Using index
|
||||
1 SIMPLE t4 ALL NULL NULL NULL NULL 12
|
||||
1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t4.c42 1 Using where
|
||||
1 SIMPLE t2 ALL NULL NULL NULL NULL 6
|
||||
1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t2.c22 1 Using where
|
||||
1 SIMPLE t1 ALL NULL NULL NULL NULL 3 Using where
|
||||
show status like 'Last_query_cost';
|
||||
Variable_name Value
|
||||
Last_query_cost 821.838037
|
||||
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 t2 ALL NULL NULL NULL NULL 6 Using where
|
||||
1 SIMPLE t2 ALL NULL NULL NULL NULL 6
|
||||
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 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 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';
|
||||
Variable_name Value
|
||||
Last_query_cost 794.838037
|
||||
Last_query_cost 274.419727
|
||||
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 t6 ALL NULL NULL NULL NULL 18
|
||||
1 SIMPLE t4 ALL NULL NULL NULL NULL 12
|
||||
1 SIMPLE t2 ALL NULL NULL NULL NULL 6
|
||||
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 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';
|
||||
Variable_name Value
|
||||
Last_query_cost 274.419727
|
||||
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 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 t2 ALL NULL NULL NULL NULL 6
|
||||
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 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';
|
||||
Variable_name Value
|
||||
Last_query_cost 794.838037
|
||||
Last_query_cost 274.419727
|
||||
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 t6 ALL NULL NULL NULL NULL 18
|
||||
1 SIMPLE t2 ALL NULL NULL NULL NULL 6
|
||||
1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where
|
||||
1 SIMPLE t2 ALL NULL NULL NULL NULL 6 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 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';
|
||||
Variable_name Value
|
||||
@ -444,13 +444,13 @@ Variable_name Value
|
||||
Last_query_cost 821.838037
|
||||
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 t6 ALL NULL NULL NULL NULL 18
|
||||
1 SIMPLE t1 ALL NULL NULL NULL NULL 3
|
||||
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 t4 ALL NULL NULL NULL NULL 12 Using where
|
||||
1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t4.c42 1
|
||||
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
|
||||
1 SIMPLE t4 ALL NULL NULL NULL NULL 12
|
||||
1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t4.c42 1 Using where
|
||||
1 SIMPLE t2 ALL NULL NULL NULL NULL 6
|
||||
1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t2.c22 1 Using where
|
||||
1 SIMPLE t1 ALL NULL NULL NULL NULL 3 Using where
|
||||
show status like 'Last_query_cost';
|
||||
Variable_name Value
|
||||
Last_query_cost 821.838037
|
||||
@ -468,16 +468,16 @@ Variable_name Value
|
||||
Last_query_cost 794.838037
|
||||
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 t6 ALL NULL NULL NULL NULL 18
|
||||
1 SIMPLE t4 ALL NULL NULL NULL NULL 12
|
||||
1 SIMPLE t2 ALL NULL NULL NULL NULL 6
|
||||
1 SIMPLE t1 eq_ref PRIMARY PRIMARY 4 test.t2.c21 1 Using where
|
||||
1 SIMPLE t1 ALL PRIMARY NULL NULL NULL 3
|
||||
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 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 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';
|
||||
Variable_name Value
|
||||
Last_query_cost 274.419727
|
||||
Last_query_cost 794.838037
|
||||
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
|
||||
@ -492,16 +492,16 @@ Variable_name Value
|
||||
Last_query_cost 794.838037
|
||||
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 t6 ALL NULL NULL NULL NULL 18
|
||||
1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where
|
||||
1 SIMPLE t1 ALL PRIMARY NULL NULL NULL 3
|
||||
1 SIMPLE t2 ALL NULL NULL NULL NULL 6 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 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 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';
|
||||
Variable_name Value
|
||||
Last_query_cost 274.419727
|
||||
Last_query_cost 794.838037
|
||||
set plan_search_depth=1;
|
||||
select @@plan_search_depth;
|
||||
@@plan_search_depth
|
||||
@ -545,8 +545,8 @@ Last_query_cost 794.838037
|
||||
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 t5 eq_ref PRIMARY PRIMARY 4 test.t1.c14 1 Using index
|
||||
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
|
||||
@ -569,8 +569,8 @@ Last_query_cost 794.838037
|
||||
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 t5 eq_ref PRIMARY PRIMARY 4 test.t1.c14 1
|
||||
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
|
||||
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
|
||||
@ -596,70 +596,6 @@ Variable_name Value
|
||||
Last_query_cost 821.838037
|
||||
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 t6 ALL NULL NULL NULL NULL 18
|
||||
1 SIMPLE t7 eq_ref PRIMARY PRIMARY 4 test.t6.c62 1 Using index
|
||||
1 SIMPLE t4 ALL NULL NULL NULL NULL 12
|
||||
1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t4.c42 1 Using where
|
||||
1 SIMPLE t2 ALL NULL NULL NULL NULL 6
|
||||
1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t2.c22 1 Using where
|
||||
1 SIMPLE t1 ALL NULL NULL NULL NULL 3 Using where
|
||||
show status like 'Last_query_cost';
|
||||
Variable_name Value
|
||||
Last_query_cost 821.838037
|
||||
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 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 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 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';
|
||||
Variable_name Value
|
||||
Last_query_cost 794.838037
|
||||
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 t6 ALL NULL NULL NULL NULL 18
|
||||
1 SIMPLE t4 ALL NULL NULL NULL NULL 12
|
||||
1 SIMPLE t2 ALL NULL NULL NULL NULL 6
|
||||
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 t7 eq_ref PRIMARY PRIMARY 4 test.t1.c16 1 Using index
|
||||
show status like 'Last_query_cost';
|
||||
Variable_name Value
|
||||
Last_query_cost 274.419727
|
||||
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 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 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 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';
|
||||
Variable_name Value
|
||||
Last_query_cost 794.838037
|
||||
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 t6 ALL NULL NULL NULL NULL 18
|
||||
1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where
|
||||
1 SIMPLE t2 ALL NULL NULL NULL NULL 6 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 t7 eq_ref PRIMARY PRIMARY 4 test.t1.c16 1 Using where
|
||||
show status like 'Last_query_cost';
|
||||
Variable_name Value
|
||||
Last_query_cost 274.419727
|
||||
set plan_search_depth=63;
|
||||
select @@plan_search_depth;
|
||||
@@plan_search_depth
|
||||
63
|
||||
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 t2 ALL NULL NULL NULL NULL 6 Using where
|
||||
1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t2.c22 1
|
||||
@ -670,18 +606,6 @@ id select_type table type possible_keys key key_len ref rows Extra
|
||||
show status like 'Last_query_cost';
|
||||
Variable_name Value
|
||||
Last_query_cost 821.838037
|
||||
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 t6 ALL NULL NULL NULL NULL 18
|
||||
1 SIMPLE t7 eq_ref PRIMARY PRIMARY 4 test.t6.c62 1 Using index
|
||||
1 SIMPLE t4 ALL NULL NULL NULL NULL 12
|
||||
1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t4.c42 1 Using where
|
||||
1 SIMPLE t2 ALL NULL NULL NULL NULL 6
|
||||
1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t2.c22 1 Using where
|
||||
1 SIMPLE t1 ALL NULL NULL NULL NULL 3 Using where
|
||||
show status like 'Last_query_cost';
|
||||
Variable_name Value
|
||||
Last_query_cost 821.838037
|
||||
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
|
||||
@ -696,16 +620,16 @@ Variable_name Value
|
||||
Last_query_cost 794.838037
|
||||
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 t6 ALL NULL NULL NULL NULL 18
|
||||
1 SIMPLE t4 ALL NULL NULL NULL NULL 12
|
||||
1 SIMPLE t2 ALL NULL NULL NULL NULL 6
|
||||
1 SIMPLE t1 eq_ref PRIMARY PRIMARY 4 test.t2.c21 1 Using where
|
||||
1 SIMPLE t1 ALL PRIMARY NULL NULL NULL 3
|
||||
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 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 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';
|
||||
Variable_name Value
|
||||
Last_query_cost 274.419727
|
||||
Last_query_cost 794.838037
|
||||
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
|
||||
@ -720,14 +644,14 @@ Variable_name Value
|
||||
Last_query_cost 794.838037
|
||||
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 t6 ALL NULL NULL NULL NULL 18
|
||||
1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where
|
||||
1 SIMPLE t1 ALL PRIMARY NULL NULL NULL 3
|
||||
1 SIMPLE t2 ALL NULL NULL NULL NULL 6 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 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 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';
|
||||
Variable_name Value
|
||||
Last_query_cost 274.419727
|
||||
Last_query_cost 794.838037
|
||||
drop table t1,t2,t3,t4,t5,t6,t7;
|
||||
|
||||
Reference in New Issue
Block a user