分析作业是否被阻塞

操作步骤

1. 查看阻塞的查询语句及阻塞查询的表、模式信息。

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   SELECT w.query as waiting_query, w.pid as w_pid, w.usename as w_user, l.query as locking_query, l.pid as l_pid, l.usename as l_user, t.schemaname || '.' || t.relname as tablename from pg_stat_activity w join pg_locks l1 on w.pid = l1.pid and not l1.granted join pg_locks l2 on l1.relation = l2.relation and l2.granted join pg_stat_activity l on l2.pid = l.pid join pg_stat_user_tables t on l1.relation = t.relid where w.waiting;

   该查询返回线程ID、用户信息、查询状态，以及导致阻塞的表、模式信息。

2. 使用如下命令结束相应的会话。其中，139834762094352为线程ID。

   1	SELECT PG_TERMINATE_BACKEND(139834762094352);

   显示类似如下信息，表示结束会话成功。

    PG_TERMINATE_BACKEND
   ----------------------
    t
   (1 row)

   显示类似如下信息，表示用户正在尝试结束当前会话，此时仅会重连会话，而不是结束会话。

   FATAL:  terminating connection due to administrator command
   FATAL:  terminating connection due to administrator command
   The connection to the server was lost. Attempting reset: Succeeded.

   

   gsql客户端使用PG_TERMINATE_BACKEND函数终止本会话后台线程时，客户端不会退出而是自动重连。