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
28
29
30
31
32
33
34
35
36
37
38
39
40
|
CREATE PROCEDURE prepare_data(IN val INT)
BEGIN
DECLARE i INT DEFAULT 1;
WHILE i < val DO
INSERT INTO t1 (b) VALUES (i);
SET i = i + 1;
END WHILE;
END|
CREATE TABLE t1 (a INT NOT NULL PRIMARY KEY AUTO_INCREMENT, b INT);
SET GLOBAL innodb_monitor_enable = module_sampling;
SELECT NAME,COUNT FROM INFORMATION_SCHEMA.INNODB_METRICS WHERE NAME='sampled_pages_read';
NAME COUNT
sampled_pages_read 0
CALL prepare_data(30000);
ANALYZE TABLE t1 UPDATE HISTOGRAM ON b WITH 50 BUCKETS;
Table Op Msg_type Msg_text
test.t1 histogram status Histogram statistics created for column 'b'.
SELECT SCHEMA_NAME, TABLE_NAME, COLUMN_NAME FROM information_schema.column_statistics WHERE COLUMN_NAME = 'b';
SCHEMA_NAME TABLE_NAME COLUMN_NAME
test t1 b
DROP TABLE t1;
SELECT NAME,COUNT FROM INFORMATION_SCHEMA.INNODB_METRICS WHERE SUBSYSTEM='sampling';
NAME COUNT
sampled_pages_read XX
sampled_pages_skipped XX
SET GLOBAL innodb_monitor_disable = module_sampling;
SET GLOBAL innodb_monitor_reset_all = "module_sampling";
#
# Cleanup
#
SET GLOBAL innodb_monitor_enable = default;
Warnings:
Warning 1230 Default value is not defined for this set option. Please specify correct counter or module name.
SET GLOBAL innodb_monitor_disable = default;
Warnings:
Warning 1230 Default value is not defined for this set option. Please specify correct counter or module name.
SET GLOBAL innodb_monitor_reset_all = default;
Warnings:
Warning 1230 Default value is not defined for this set option. Please specify correct counter or module name.
DROP PROCEDURE prepare_data;
|
