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+title = "什么是慢SQL且如何查看慢SQL" 
+
+date = "2022-08-11" 
+
+tags = ["什么是慢SQL且如何查看慢SQL"] 
+
+archives = "2022-04" 
+
+author = "张翠娉" 
+
+summary = "什么是慢SQL且如何查看慢SQL"
+
+img = "/zh/post/zhangcuiping/title/img.png" 
+
+times = "10:20"
+
++++
+
+# 什么是慢SQL且如何查看慢SQL？
+
+
+
+## **介绍**
+
+某个SQL执行时间超过指定时间时称为慢SQL。我们可以查看慢SQL，包括历史慢SQL以及当前慢SQL。
+
+## 查看历史慢SQL
+
+首先要设置log_min_duration_statement，记录慢SQL。  
+
+然后在参数log_directory 指定的目录中查看日志。  
+
+进入数据库的数据目录，找到postgresql.conf配置文件，设置log_min_duration_statement参数。
+
+```bash
+cd /opt/mogdb/data
+```
+
+## 查看当前慢SQL
+
+例如查询执行时间超过1秒的SQL 
+
+``` sql
+MogDB=# select * from pg_stat_activity where state<>'idle' and now()-query_start > interval '1 s' order by query_start; 
+ datid | datname  |      pid       |   sessionid    | usesysid | usename | application_name | client_addr | client_hostname | client_port |         back
+end_start         |          xact_start           |          query_start          |         state_change          | waiting | enqueue | state  | resourc
+e_pool | query_id |                 query                  | connection_info | unique_sql_id | trace_id 
+-------+----------+----------------+----------------+----------+---------+------------------+-------------+-----------------+-------------+-------------
+------------------+-------------------------------+-------------------------------+-------------------------------+---------+---------+--------+--------
+-------+----------+----------------------------------------+-----------------+---------------+----------
+ 16019 | postgres | 70396694860272 | 70396694860272 |       10 | ommdoc  | workload         |             |                 |             | 2022-07-25 1
+5:15:34.954987+08 | 2022-07-25 15:15:34.957823+08 | 2022-07-25 15:15:34.957823+08 | 2022-07-25 15:15:34.959476+08 | f       |         | active | default
+_pool  |        0 | WLM fetch collect info from data nodes |                 |             0 | 
+(1 row)
+
+MogDB=# 
+```
+
+