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Adjust cost for re-creating a row from the JOIN CACHE
Creating a record from the join cache is faster than getting a row from the engine (less and simpler code to execute). Added JOIN_CACHE_ROW_COPY_COST_FACTOR (0.5 for now) as the factor to take this into account. This is multiplied with ROW_COPY_COST. Other things: - Added cost of copying rows to hash join, similar to join_cache joins.
This commit is contained in:
Monty
Sergei Petrunia
@ -127,7 +127,7 @@ id select_type table type possible_keys key key_len ref rows Extra
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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 2696.338350
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Last_query_cost 2445.013350
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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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@ -139,7 +139,7 @@ id select_type table type possible_keys key key_len ref rows Extra
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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 2696.338350
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Last_query_cost 2445.013350
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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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@ -151,7 +151,7 @@ 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 Using where; Using join buffer (flat, BNL join)
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show status like 'Last_query_cost';
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Variable_name Value
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Last_query_cost 1559.791393
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Last_query_cost 1330.797643
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explain select t1.c11 from t7, t6, t5, t4, t3, t2, t1 where t1.c11 = t2.c21 and t1.c12 = t3.c31 and t1.c13 = t4.c41 and t1.c14 = t5.c51 and t1.c15 = t6.c61 and t1.c16 = t7.c71;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t2 ALL NULL NULL NULL NULL 6
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@ -163,7 +163,7 @@ 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 Using where; Using join buffer (flat, BNL join)
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show status like 'Last_query_cost';
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Variable_name Value
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Last_query_cost 1559.791393
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Last_query_cost 1330.797643
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explain select t1.c11 from t1, t2, t3, t4, t5, t6, t7 where t1.c11 = t2.c21 and t1.c12 = t3.c31 and t1.c13 = t4.c41 and t1.c14 = t5.c51 and t1.c15 = t6.c61 and t1.c16 = t7.c71 and t2.c22 = t3.c32 and t2.c23 = t4.c42 and t2.c24 = t5.c52 and t2.c25 = t6.c62 and t2.c26 = t7.c72 and t3.c33 = t4.c43 and t3.c34 = t5.c53 and t3.c35 = t6.c63 and t3.c36 = t7.c73 and t4.c42 = t5.c54 and t4.c43 = t6.c64 and t4.c44 = t7.c74 and t5.c52 = t6.c65 and t5.c53 = t7.c75 and t6.c62 = t7.c76;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t2 ALL NULL NULL NULL NULL 6
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@ -175,7 +175,7 @@ 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 Using where; Using join buffer (flat, BNL join)
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show status like 'Last_query_cost';
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Variable_name Value
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Last_query_cost 1563.335143
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Last_query_cost 1334.341393
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explain select t1.c11 from t7, t6, t5, t4, t3, t2, t1 where t1.c11 = t2.c21 and t1.c12 = t3.c31 and t1.c13 = t4.c41 and t1.c14 = t5.c51 and t1.c15 = t6.c61 and t1.c16 = t7.c71 and t2.c22 = t3.c32 and t2.c23 = t4.c42 and t2.c24 = t5.c52 and t2.c25 = t6.c62 and t2.c26 = t7.c72 and t3.c33 = t4.c43 and t3.c34 = t5.c53 and t3.c35 = t6.c63 and t3.c36 = t7.c73 and t4.c42 = t5.c54 and t4.c43 = t6.c64 and t4.c44 = t7.c74 and t5.c52 = t6.c65 and t5.c53 = t7.c75 and t6.c62 = t7.c76;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t2 ALL NULL NULL NULL NULL 6
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@ -187,7 +187,7 @@ 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 Using where; Using join buffer (flat, BNL join)
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show status like 'Last_query_cost';
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Variable_name Value
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Last_query_cost 1563.335143
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Last_query_cost 1334.341393
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set optimizer_prune_level=0;
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select @@optimizer_prune_level;
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@@optimizer_prune_level
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@ -207,7 +207,7 @@ id select_type table type possible_keys key key_len ref rows Extra
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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 2693.038350
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Last_query_cost 2437.438350
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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 t2 ALL NULL NULL NULL NULL 6 Using where
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@ -219,7 +219,7 @@ id select_type table type possible_keys key key_len ref rows Extra
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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 2693.038350
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Last_query_cost 2437.438350
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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 Using where
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@ -231,7 +231,7 @@ 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 Using where; Using join buffer (flat, BNL join)
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show status like 'Last_query_cost';
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Variable_name Value
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Last_query_cost 751.472751
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Last_query_cost 653.372751
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explain select t1.c11 from t7, t6, t5, t4, t3, t2, t1 where t1.c11 = t2.c21 and t1.c12 = t3.c31 and t1.c13 = t4.c41 and t1.c14 = t5.c51 and t1.c15 = t6.c61 and t1.c16 = t7.c71;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using where
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@ -243,7 +243,7 @@ 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 Using where; Using join buffer (flat, BNL join)
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show status like 'Last_query_cost';
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Variable_name Value
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Last_query_cost 751.472751
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Last_query_cost 653.372751
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explain select t1.c11 from t1, t2, t3, t4, t5, t6, t7 where t1.c11 = t2.c21 and t1.c12 = t3.c31 and t1.c13 = t4.c41 and t1.c14 = t5.c51 and t1.c15 = t6.c61 and t1.c16 = t7.c71 and t2.c22 = t3.c32 and t2.c23 = t4.c42 and t2.c24 = t5.c52 and t2.c25 = t6.c62 and t2.c26 = t7.c72 and t3.c33 = t4.c43 and t3.c34 = t5.c53 and t3.c35 = t6.c63 and t3.c36 = t7.c73 and t4.c42 = t5.c54 and t4.c43 = t6.c64 and t4.c44 = t7.c74 and t5.c52 = t6.c65 and t5.c53 = t7.c75 and t6.c62 = t7.c76;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using where
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@ -255,7 +255,7 @@ 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 Using where; Using join buffer (flat, BNL join)
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show status like 'Last_query_cost';
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Variable_name Value
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Last_query_cost 760.922751
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Last_query_cost 662.822751
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explain select t1.c11 from t7, t6, t5, t4, t3, t2, t1 where t1.c11 = t2.c21 and t1.c12 = t3.c31 and t1.c13 = t4.c41 and t1.c14 = t5.c51 and t1.c15 = t6.c61 and t1.c16 = t7.c71 and t2.c22 = t3.c32 and t2.c23 = t4.c42 and t2.c24 = t5.c52 and t2.c25 = t6.c62 and t2.c26 = t7.c72 and t3.c33 = t4.c43 and t3.c34 = t5.c53 and t3.c35 = t6.c63 and t3.c36 = t7.c73 and t4.c42 = t5.c54 and t4.c43 = t6.c64 and t4.c44 = t7.c74 and t5.c52 = t6.c65 and t5.c53 = t7.c75 and t6.c62 = t7.c76;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using where
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@ -267,7 +267,7 @@ 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 Using where; Using join buffer (flat, BNL join)
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show status like 'Last_query_cost';
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Variable_name Value
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Last_query_cost 760.922751
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Last_query_cost 662.822751
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set optimizer_search_depth=1;
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select @@optimizer_search_depth;
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@@optimizer_search_depth
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@ -283,7 +283,7 @@ id select_type table type possible_keys key key_len ref rows Extra
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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 2696.338350
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Last_query_cost 2445.013350
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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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@ -295,7 +295,7 @@ id select_type table type possible_keys key key_len ref rows Extra
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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 2696.338350
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Last_query_cost 2445.013350
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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 Using where
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@ -307,7 +307,7 @@ 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 Using where; Using join buffer (flat, BNL join)
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show status like 'Last_query_cost';
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Variable_name Value
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Last_query_cost 2068.798851
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Last_query_cost 1762.798851
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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 Using where
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@ -319,7 +319,7 @@ 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 Using where; Using join buffer (flat, BNL join)
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show status like 'Last_query_cost';
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Variable_name Value
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Last_query_cost 2068.798851
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Last_query_cost 1762.798851
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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 Using where
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@ -331,7 +331,7 @@ 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 Using where; Using join buffer (flat, BNL join)
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show status like 'Last_query_cost';
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Variable_name Value
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Last_query_cost 2073.523851
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Last_query_cost 1767.523851
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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
|
||||
1 SIMPLE t1 ALL PRIMARY NULL NULL NULL 3 Using where
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@ -343,7 +343,7 @@ 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 Using where; Using join buffer (flat, BNL join)
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show status like 'Last_query_cost';
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Variable_name Value
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Last_query_cost 2073.523851
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Last_query_cost 1767.523851
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set optimizer_search_depth=62;
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select @@optimizer_search_depth;
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@@optimizer_search_depth
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@ -359,7 +359,7 @@ id select_type table type possible_keys key key_len ref rows Extra
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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 2693.038350
|
||||
Last_query_cost 2437.438350
|
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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
|
||||
1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using where
|
||||
@ -371,7 +371,7 @@ id select_type table type possible_keys key key_len ref rows Extra
|
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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 2693.038350
|
||||
Last_query_cost 2437.438350
|
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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;
|
||||
id select_type table type possible_keys key key_len ref rows Extra
|
||||
1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using where
|
||||
@ -383,7 +383,7 @@ id select_type table type possible_keys key key_len ref rows Extra
|
||||
1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where; Using join buffer (flat, BNL join)
|
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show status like 'Last_query_cost';
|
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Variable_name Value
|
||||
Last_query_cost 751.472751
|
||||
Last_query_cost 653.372751
|
||||
explain select t1.c11 from t7, t6, t5, t4, t3, t2, t1 where t1.c11 = t2.c21 and t1.c12 = t3.c31 and t1.c13 = t4.c41 and t1.c14 = t5.c51 and t1.c15 = t6.c61 and t1.c16 = t7.c71;
|
||||
id select_type table type possible_keys key key_len ref rows Extra
|
||||
1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using where
|
||||
@ -395,7 +395,7 @@ id select_type table type possible_keys key key_len ref rows Extra
|
||||
1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where; Using join buffer (flat, BNL join)
|
||||
show status like 'Last_query_cost';
|
||||
Variable_name Value
|
||||
Last_query_cost 751.472751
|
||||
Last_query_cost 653.372751
|
||||
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 Using where
|
||||
@ -407,7 +407,7 @@ id select_type table type possible_keys key key_len ref rows Extra
|
||||
1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where; Using join buffer (flat, BNL join)
|
||||
show status like 'Last_query_cost';
|
||||
Variable_name Value
|
||||
Last_query_cost 760.922751
|
||||
Last_query_cost 662.822751
|
||||
explain select t1.c11 from t7, t6, t5, t4, t3, t2, t1 where t1.c11 = t2.c21 and t1.c12 = t3.c31 and t1.c13 = t4.c41 and t1.c14 = t5.c51 and t1.c15 = t6.c61 and t1.c16 = t7.c71 and t2.c22 = t3.c32 and t2.c23 = t4.c42 and t2.c24 = t5.c52 and t2.c25 = t6.c62 and t2.c26 = t7.c72 and t3.c33 = t4.c43 and t3.c34 = t5.c53 and t3.c35 = t6.c63 and t3.c36 = t7.c73 and t4.c42 = t5.c54 and t4.c43 = t6.c64 and t4.c44 = t7.c74 and t5.c52 = t6.c65 and t5.c53 = t7.c75 and t6.c62 = t7.c76;
|
||||
id select_type table type possible_keys key key_len ref rows Extra
|
||||
1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using where
|
||||
@ -419,7 +419,7 @@ id select_type table type possible_keys key key_len ref rows Extra
|
||||
1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where; Using join buffer (flat, BNL join)
|
||||
show status like 'Last_query_cost';
|
||||
Variable_name Value
|
||||
Last_query_cost 760.922751
|
||||
Last_query_cost 662.822751
|
||||
set optimizer_prune_level=2;
|
||||
select @@optimizer_prune_level;
|
||||
@@optimizer_prune_level
|
||||
@ -439,7 +439,7 @@ id select_type table type possible_keys key key_len ref rows Extra
|
||||
1 SIMPLE t7 eq_ref PRIMARY PRIMARY 4 test.t6.c62 1 Using index
|
||||
show status like 'Last_query_cost';
|
||||
Variable_name Value
|
||||
Last_query_cost 2696.338350
|
||||
Last_query_cost 2445.013350
|
||||
explain select t1.c11 from t7, t6, t5, t4, t3, t2, t1 where t1.c12 = t2.c21 and t2.c22 = t3.c31 and t3.c32 = t4.c41 and t4.c42 = t5.c51 and t5.c52 = t6.c61 and t6.c62 = t7.c71;
|
||||
id select_type table type possible_keys key key_len ref rows Extra
|
||||
1 SIMPLE t1 ALL NULL NULL NULL NULL 3
|
||||
@ -451,7 +451,7 @@ id select_type table type possible_keys key key_len ref rows Extra
|
||||
1 SIMPLE t7 eq_ref PRIMARY PRIMARY 4 test.t6.c62 1 Using index
|
||||
show status like 'Last_query_cost';
|
||||
Variable_name Value
|
||||
Last_query_cost 2696.338350
|
||||
Last_query_cost 2445.013350
|
||||
explain select t1.c11 from t1, t2, t3, t4, t5, t6, t7 where t1.c11 = t2.c21 and t1.c12 = t3.c31 and t1.c13 = t4.c41 and t1.c14 = t5.c51 and t1.c15 = t6.c61 and t1.c16 = t7.c71;
|
||||
id select_type table type possible_keys key key_len ref rows Extra
|
||||
1 SIMPLE t2 ALL NULL NULL NULL NULL 6
|
||||
@ -463,7 +463,7 @@ id select_type table type possible_keys key key_len ref rows Extra
|
||||
1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where; Using join buffer (flat, BNL join)
|
||||
show status like 'Last_query_cost';
|
||||
Variable_name Value
|
||||
Last_query_cost 1559.791393
|
||||
Last_query_cost 1330.797643
|
||||
explain select t1.c11 from t7, t6, t5, t4, t3, t2, t1 where t1.c11 = t2.c21 and t1.c12 = t3.c31 and t1.c13 = t4.c41 and t1.c14 = t5.c51 and t1.c15 = t6.c61 and t1.c16 = t7.c71;
|
||||
id select_type table type possible_keys key key_len ref rows Extra
|
||||
1 SIMPLE t2 ALL NULL NULL NULL NULL 6
|
||||
@ -475,7 +475,7 @@ id select_type table type possible_keys key key_len ref rows Extra
|
||||
1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where; Using join buffer (flat, BNL join)
|
||||
show status like 'Last_query_cost';
|
||||
Variable_name Value
|
||||
Last_query_cost 1559.791393
|
||||
Last_query_cost 1330.797643
|
||||
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
|
||||
@ -487,7 +487,7 @@ id select_type table type possible_keys key key_len ref rows Extra
|
||||
1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where; Using join buffer (flat, BNL join)
|
||||
show status like 'Last_query_cost';
|
||||
Variable_name Value
|
||||
Last_query_cost 1563.335143
|
||||
Last_query_cost 1334.341393
|
||||
explain select t1.c11 from t7, t6, t5, t4, t3, t2, t1 where t1.c11 = t2.c21 and t1.c12 = t3.c31 and t1.c13 = t4.c41 and t1.c14 = t5.c51 and t1.c15 = t6.c61 and t1.c16 = t7.c71 and t2.c22 = t3.c32 and t2.c23 = t4.c42 and t2.c24 = t5.c52 and t2.c25 = t6.c62 and t2.c26 = t7.c72 and t3.c33 = t4.c43 and t3.c34 = t5.c53 and t3.c35 = t6.c63 and t3.c36 = t7.c73 and t4.c42 = t5.c54 and t4.c43 = t6.c64 and t4.c44 = t7.c74 and t5.c52 = t6.c65 and t5.c53 = t7.c75 and t6.c62 = t7.c76;
|
||||
id select_type table type possible_keys key key_len ref rows Extra
|
||||
1 SIMPLE t2 ALL NULL NULL NULL NULL 6
|
||||
@ -499,7 +499,7 @@ id select_type table type possible_keys key key_len ref rows Extra
|
||||
1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where; Using join buffer (flat, BNL join)
|
||||
show status like 'Last_query_cost';
|
||||
Variable_name Value
|
||||
Last_query_cost 1563.335143
|
||||
Last_query_cost 1334.341393
|
||||
set optimizer_search_depth=1;
|
||||
select @@optimizer_search_depth;
|
||||
@@optimizer_search_depth
|
||||
@ -515,7 +515,7 @@ id select_type table type possible_keys key key_len ref rows Extra
|
||||
1 SIMPLE t7 eq_ref PRIMARY PRIMARY 4 test.t6.c62 1 Using index
|
||||
show status like 'Last_query_cost';
|
||||
Variable_name Value
|
||||
Last_query_cost 2696.338350
|
||||
Last_query_cost 2445.013350
|
||||
explain select t1.c11 from t7, t6, t5, t4, t3, t2, t1 where t1.c12 = t2.c21 and t2.c22 = t3.c31 and t3.c32 = t4.c41 and t4.c42 = t5.c51 and t5.c52 = t6.c61 and t6.c62 = t7.c71;
|
||||
id select_type table type possible_keys key key_len ref rows Extra
|
||||
1 SIMPLE t1 ALL NULL NULL NULL NULL 3
|
||||
@ -527,7 +527,7 @@ id select_type table type possible_keys key key_len ref rows Extra
|
||||
1 SIMPLE t7 eq_ref PRIMARY PRIMARY 4 test.t6.c62 1 Using index
|
||||
show status like 'Last_query_cost';
|
||||
Variable_name Value
|
||||
Last_query_cost 2696.338350
|
||||
Last_query_cost 2445.013350
|
||||
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 Using where
|
||||
@ -539,7 +539,7 @@ id select_type table type possible_keys key key_len ref rows Extra
|
||||
1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where; Using join buffer (flat, BNL join)
|
||||
show status like 'Last_query_cost';
|
||||
Variable_name Value
|
||||
Last_query_cost 2068.798851
|
||||
Last_query_cost 1762.798851
|
||||
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 Using where
|
||||
@ -551,7 +551,7 @@ id select_type table type possible_keys key key_len ref rows Extra
|
||||
1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where; Using join buffer (flat, BNL join)
|
||||
show status like 'Last_query_cost';
|
||||
Variable_name Value
|
||||
Last_query_cost 2068.798851
|
||||
Last_query_cost 1762.798851
|
||||
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 Using where
|
||||
@ -563,7 +563,7 @@ id select_type table type possible_keys key key_len ref rows Extra
|
||||
1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where; Using join buffer (flat, BNL join)
|
||||
show status like 'Last_query_cost';
|
||||
Variable_name Value
|
||||
Last_query_cost 2073.523851
|
||||
Last_query_cost 1767.523851
|
||||
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 Using where
|
||||
@ -575,7 +575,7 @@ id select_type table type possible_keys key key_len ref rows Extra
|
||||
1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where; Using join buffer (flat, BNL join)
|
||||
show status like 'Last_query_cost';
|
||||
Variable_name Value
|
||||
Last_query_cost 2073.523851
|
||||
Last_query_cost 1767.523851
|
||||
set optimizer_search_depth=62;
|
||||
select @@optimizer_search_depth;
|
||||
@@optimizer_search_depth
|
||||
@ -591,7 +591,7 @@ id select_type table type possible_keys key key_len ref rows Extra
|
||||
1 SIMPLE t7 eq_ref PRIMARY PRIMARY 4 test.t6.c62 1 Using index
|
||||
show status like 'Last_query_cost';
|
||||
Variable_name Value
|
||||
Last_query_cost 2696.338350
|
||||
Last_query_cost 2445.013350
|
||||
explain select t1.c11 from t7, t6, t5, t4, t3, t2, t1 where t1.c12 = t2.c21 and t2.c22 = t3.c31 and t3.c32 = t4.c41 and t4.c42 = t5.c51 and t5.c52 = t6.c61 and t6.c62 = t7.c71;
|
||||
id select_type table type possible_keys key key_len ref rows Extra
|
||||
1 SIMPLE t1 ALL NULL NULL NULL NULL 3
|
||||
@ -603,7 +603,7 @@ id select_type table type possible_keys key key_len ref rows Extra
|
||||
1 SIMPLE t7 eq_ref PRIMARY PRIMARY 4 test.t6.c62 1 Using index
|
||||
show status like 'Last_query_cost';
|
||||
Variable_name Value
|
||||
Last_query_cost 2696.338350
|
||||
Last_query_cost 2445.013350
|
||||
explain select t1.c11 from t1, t2, t3, t4, t5, t6, t7 where t1.c11 = t2.c21 and t1.c12 = t3.c31 and t1.c13 = t4.c41 and t1.c14 = t5.c51 and t1.c15 = t6.c61 and t1.c16 = t7.c71;
|
||||
id select_type table type possible_keys key key_len ref rows Extra
|
||||
1 SIMPLE t2 ALL NULL NULL NULL NULL 6
|
||||
@ -615,7 +615,7 @@ id select_type table type possible_keys key key_len ref rows Extra
|
||||
1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where; Using join buffer (flat, BNL join)
|
||||
show status like 'Last_query_cost';
|
||||
Variable_name Value
|
||||
Last_query_cost 1559.791393
|
||||
Last_query_cost 1330.797643
|
||||
explain select t1.c11 from t7, t6, t5, t4, t3, t2, t1 where t1.c11 = t2.c21 and t1.c12 = t3.c31 and t1.c13 = t4.c41 and t1.c14 = t5.c51 and t1.c15 = t6.c61 and t1.c16 = t7.c71;
|
||||
id select_type table type possible_keys key key_len ref rows Extra
|
||||
1 SIMPLE t2 ALL NULL NULL NULL NULL 6
|
||||
@ -627,7 +627,7 @@ id select_type table type possible_keys key key_len ref rows Extra
|
||||
1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where; Using join buffer (flat, BNL join)
|
||||
show status like 'Last_query_cost';
|
||||
Variable_name Value
|
||||
Last_query_cost 1559.791393
|
||||
Last_query_cost 1330.797643
|
||||
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
|
||||
@ -639,7 +639,7 @@ id select_type table type possible_keys key key_len ref rows Extra
|
||||
1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where; Using join buffer (flat, BNL join)
|
||||
show status like 'Last_query_cost';
|
||||
Variable_name Value
|
||||
Last_query_cost 1563.335143
|
||||
Last_query_cost 1334.341393
|
||||
explain select t1.c11 from t7, t6, t5, t4, t3, t2, t1 where t1.c11 = t2.c21 and t1.c12 = t3.c31 and t1.c13 = t4.c41 and t1.c14 = t5.c51 and t1.c15 = t6.c61 and t1.c16 = t7.c71 and t2.c22 = t3.c32 and t2.c23 = t4.c42 and t2.c24 = t5.c52 and t2.c25 = t6.c62 and t2.c26 = t7.c72 and t3.c33 = t4.c43 and t3.c34 = t5.c53 and t3.c35 = t6.c63 and t3.c36 = t7.c73 and t4.c42 = t5.c54 and t4.c43 = t6.c64 and t4.c44 = t7.c74 and t5.c52 = t6.c65 and t5.c53 = t7.c75 and t6.c62 = t7.c76;
|
||||
id select_type table type possible_keys key key_len ref rows Extra
|
||||
1 SIMPLE t2 ALL NULL NULL NULL NULL 6
|
||||
@ -651,7 +651,7 @@ id select_type table type possible_keys key key_len ref rows Extra
|
||||
1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where; Using join buffer (flat, BNL join)
|
||||
show status like 'Last_query_cost';
|
||||
Variable_name Value
|
||||
Last_query_cost 1563.335143
|
||||
Last_query_cost 1334.341393
|
||||
drop table t1,t2,t3,t4,t5,t6,t7;
|
||||
CREATE TABLE t1 (a int, b int, d int, i int);
|
||||
INSERT INTO t1 VALUES (1,1,1,1);
|
||||
|
||||
Reference in New Issue
Block a user