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1
by brian
clean slate |
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flush status;
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734
by Brian Aker
Merging Stewart (one fix to his test case to drop t1 if left from previous |
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drop table if exists t1;
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1
by brian
clean slate |
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select 1;
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1
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1
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show status like 'last_query_cost';
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Variable_name Value
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Last_query_cost 0.000000
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673.3.31
by Stewart Smith
status test: remove bits not applicable to Drizzle, explicitly use MyISAM in a few places to get stable costs |
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create table t1 (a int) engine=myisam;
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1
by brian
clean slate |
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insert into t1 values (1),(2),(3),(4),(5),(6),(7),(8),(9),(10);
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insert into t1 values (1),(2),(3),(4),(5),(6),(7),(8),(9),(10);
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insert into t1 values (1),(2),(3),(4),(5),(6),(7),(8),(9),(10);
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insert into t1 values (1),(2),(3),(4),(5),(6),(7),(8),(9),(10);
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insert into t1 values (1),(2),(3),(4),(5),(6),(7),(8),(9),(10);
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select * from t1 where a=6;
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a
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6
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6
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6
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6
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6
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show status like 'last_query_cost';
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Variable_name Value
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Last_query_cost 12.084449
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show status like 'last_query_cost';
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Variable_name Value
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Last_query_cost 12.084449
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select 1;
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1
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1
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show status like 'last_query_cost';
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Variable_name Value
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Last_query_cost 0.000000
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drop table t1;
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FLUSH STATUS;
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SHOW STATUS LIKE 'max_used_connections';
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Variable_name Value
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Max_used_connections 1
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SELECT * FROM INFORMATION_SCHEMA.SESSION_STATUS WHERE VARIABLE_NAME LIKE 'max_used_connections';
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VARIABLE_NAME VARIABLE_VALUE
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MAX_USED_CONNECTIONS 1
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673.3.31
by Stewart Smith
status test: remove bits not applicable to Drizzle, explicitly use MyISAM in a few places to get stable costs |
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SHOW STATUS LIKE 'max_used_connections';
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Variable_name Value
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Max_used_connections 3
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SELECT * FROM INFORMATION_SCHEMA.SESSION_STATUS WHERE VARIABLE_NAME LIKE 'max_used_connections';
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VARIABLE_NAME VARIABLE_VALUE
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MAX_USED_CONNECTIONS 3
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CREATE TABLE t1 ( a INT ) ENGINE=MyISAM;
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1
by brian
clean slate |
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INSERT INTO t1 VALUES (1), (2);
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SELECT a FROM t1 LIMIT 1;
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a
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1
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SHOW SESSION STATUS LIKE 'Last_query_cost';
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Variable_name Value
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Last_query_cost 2.402418
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EXPLAIN SELECT a FROM t1;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ALL NULL NULL NULL NULL 2
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SHOW SESSION STATUS LIKE 'Last_query_cost';
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Variable_name Value
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Last_query_cost 2.402418
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SELECT a FROM t1 UNION SELECT a FROM t1 ORDER BY a;
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a
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1
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2
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SHOW SESSION STATUS LIKE 'Last_query_cost';
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Variable_name Value
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Last_query_cost 0.000000
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EXPLAIN SELECT a FROM t1 UNION SELECT a FROM t1 ORDER BY a;
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id select_type table type possible_keys key key_len ref rows Extra
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1 PRIMARY t1 ALL NULL NULL NULL NULL 2
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2 UNION t1 ALL NULL NULL NULL NULL 2
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NULL UNION RESULT <union1,2> ALL NULL NULL NULL NULL NULL Using filesort
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SHOW SESSION STATUS LIKE 'Last_query_cost';
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Variable_name Value
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Last_query_cost 0.000000
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SELECT a IN (SELECT a FROM t1) FROM t1 LIMIT 1;
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a IN (SELECT a FROM t1)
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1
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SHOW SESSION STATUS LIKE 'Last_query_cost';
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Variable_name Value
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Last_query_cost 0.000000
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SELECT (SELECT a FROM t1 LIMIT 1) x FROM t1 LIMIT 1;
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x
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1
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SHOW SESSION STATUS LIKE 'Last_query_cost';
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Variable_name Value
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Last_query_cost 0.000000
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SELECT * FROM t1 a, t1 b LIMIT 1;
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a a
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1 1
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SHOW SESSION STATUS LIKE 'Last_query_cost';
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Variable_name Value
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Last_query_cost 4.805836
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DROP TABLE t1;
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