SHOW PROFILE [type [, type] ... ]
[FOR QUERY n]
[LIMIT row_count [OFFSET offset]]
type: {
ALL
| BLOCK IO
| CONTEXT SWITCHES
| CPU
| IPC
| MEMORY
| PAGE FAULTS
| SOURCE
| SWAPS
}
SHOW PROFILE
和SHOW PROFILES
语句显示分析信息,这些信息指示在当前会话过程中执行的语句的资源使用情况。每个会话启用分析后,当会话结束时,其分析信息将丢失。
SHOW PROFILE
和SHOW PROFILES
已经被弃用了,未来将不使用这个。The
SHOW PROFILE
andSHOW PROFILES
statements are deprecated; expect them to be removed in a future MySQL release. Use the Performance Schema instead; see Section 29.19.1, “Query Profiling Using Performance Schema”.
#设置为1,开启性能分析
mysql> SET profiling = 1;
#查看配置
mysql> SELECT @@profiling;
+-------------+
| @@profiling |
+-------------+
| 0 |
+-------------+
1 row in set (0.00 sec)
#开启分析
mysql> SET profiling = 1;
Query OK, 0 rows affected (0.00 sec)
#执行任意的sql语句
mysql> DROP TABLE IF EXISTS t1;
Query OK, 0 rows affected, 1 warning (0.00 sec)
mysql> CREATE TABLE T1 (id INT);
Query OK, 0 rows affected (0.01 sec)
## 查看执行过的sql 的QUERYID,Duration持续时间
mysql> SHOW PROFILES;
+----------+----------+--------------------------+
| Query_ID | Duration | Query |
+----------+----------+--------------------------+
| 0 | 0.000088 | SET PROFILING = 1 |
| 1 | 0.000136 | DROP TABLE IF EXISTS t1 |
| 2 | 0.011947 | CREATE TABLE t1 (id INT) |
+----------+----------+--------------------------+
3 rows in set (0.00 sec)
#最近一个查询的 profile 信息
mysql> SHOW PROFILE;
+----------------------+----------+
| Status | Duration |
+----------------------+----------+
| checking permissions | 0.000040 |
| creating table | 0.000056 |
| After create | 0.011363 |
| query end | 0.000375 |
| freeing items | 0.000089 |
| logging slow query | 0.000019 |
| cleaning up | 0.000005 |
+----------------------+----------+
7 rows in set (0.00 sec)
mysql> SHOW PROFILE FOR QUERY 1;
+--------------------+----------+
| Status | Duration |
+--------------------+----------+
| query end | 0.000107 |
| freeing items | 0.000008 |
| logging slow query | 0.000015 |
| cleaning up | 0.000006 |
+--------------------+----------+
4 rows in set (0.00 sec)
mysql> SHOW PROFILE CPU FOR QUERY 2;
+----------------------+----------+----------+------------+
| Status | Duration | CPU_user | CPU_system |
+----------------------+----------+----------+------------+
| checking permissions | 0.000040 | 0.000038 | 0.000002 |
| creating table | 0.000056 | 0.000028 | 0.000028 |
| After create | 0.011363 | 0.000217 | 0.001571 |
| query end | 0.000375 | 0.000013 | 0.000028 |
| freeing items | 0.000089 | 0.000010 | 0.000014 |
| logging slow query | 0.000019 | 0.000009 | 0.000010 |
| cleaning up | 0.000005 | 0.000003 | 0.000002 |
+----------------------+----------+----------+------------+
7 rows in set (0.00 sec)
SHOW PROFILES 显示最近发送到服务器的语句的列表。列表的大小由profiling_history_size会话变量控制,该变量的默认值为15。最大值为100。将该值设置为0具有禁用分析的实际效果。
分析信息也可从INFORMATION_SCHEMA PROFILING表中获得。请参见第28.3.24节“INFORMATION_SCHEMA PROFILING表”。例如,以下查询是等效的:
SHOW PROFILE FOR QUERY 2;
SELECT STATE, FORMAT(DURATION, 6) AS DURATION
FROM INFORMATION_SCHEMA.PROFILING
WHERE QUERY_ID = 2 ORDER BY SEQ;
标签:PROFILE,rows,SHOW,0.00,sec,mysql
From: https://www.cnblogs.com/bigorang/p/18261090