blob: f951428abc7520a3db919c780b9ffce60ac3deec (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
|
set GLOBAL query_cache_size=1355776;
flush query cache;
flush query cache;
reset query cache;
flush status;
DROP TABLE IF EXISTS t;
CREATE TABLE t(id INT, number INT);
INSERT INTO t VALUES (0,1);
INSERT INTO t VALUES (1,2);
INSERT INTO t VALUES (2,3);
SELECT number from t where id > 0;
number
2
3
SET SESSION debug="+d,status_wait_query_cache_mutex_sleep";
SELECT number from t where id > 0;
SET SESSION debug="+d,status_wait_query_cache_mutex_sleep";
SELECT number from t where id > 0;
SET SESSION debug="+d,status_wait_query_cache_mutex_sleep";
SHOW PROCESSLIST;
Id User Host db Command Time State Info Rows_sent Rows_examined Rows_read
Id root localhost test Sleep Time NULL Rows_sent Rows_examined Rows_read
Id root localhost test Query Time Waiting on query cache mutex SELECT number from t where id > 0 Rows_sent Rows_examined Rows_read
Id root localhost test Query Time Waiting on query cache mutex SELECT number from t where id > 0 Rows_sent Rows_examined Rows_read
Id root localhost test Query Time NULL SHOW PROCESSLIST Rows_sent Rows_examined Rows_read
DROP TABLE t;
set GLOBAL query_cache_size=0;
|
