datname:用户所连接数据库的名称。 wait_event:进程正在等待的事件的名称(如果有)。如果进程处于活动状态并且存在wait_event,则表示查询当前被系统的其他部分阻塞。 wait_event_type:进程正在等待的事件的类别。 pid:进程的进程号。 query_start:对于活动查询,当前查询开始的时间戳。 xact_start:如果进程正在执行事务,...
Wait Event TypeWait Event NameDescription LWLock ShmemIndexLock Waiting to find or allocate space in shared memory. OidGenLock Waiting to allocate or assign an OID. XidGenLock Waiting to allocate or assign a transaction id. ProcArrayLock Waiting to get a snapshot or clearing a transaction id ...
This wait event is experienced whenever the database needs to open a file. Wait time is recorded beginning just prior to when the open request is issued until the time the request is returned, having Oracle 数据库 OraclecursorpinSwaitonX等待事件说明 这个等待事件也算一个常见的等待事件。 在...
select pid,pg_blocking_pids(pid),wait_event_type,wait_event,query from pg_stat_activity ; pid : 当前会话,被阻塞者 pg_blocking_pids(pid) : 阻塞者 wait_event_type : 会话状态,Lock表示被阻塞无法获取锁资源 wait_event : 等待事件 query : 会话执行相关查询 ...
select pid,now()-query_start as "执行时间",wait_event_type,wait_event,query from pg_stat_activity; 上面两个SQL执行的效果是一致的,直接查看整个视图信息会较全,但是比较多,可使用第二个视图,其中,wait_event wait_event_type 字段代表等待事件。不同的等待事件代表不同的含义。
,a2.datname,a2.usename,a2.application_name,a2.client_addr,a2.wait_event_type,a2.wait_event,a2.state --,a2.backend_start,a2.xact_start,a2.query_start from tmp3 a0 left outer join (select distinct '/'||id||'/' as prefix_id,id ...
wait_event_type "wait_event_type(等待类型)" --,a.wait_event "wait_event(等待事件)" --,a.state "state(状态)" --,a.query "sql(执行的sql)" --,a.backend_type "backend_type(后端类型)" from pg_stat_activity a left join pg_roles b on (a.usesysid = b.oid) where a.state = '...
EXPLAIN命令现在会显示本地块读写I/O耗时,并包含两个新选项:SERIALIZE和MEMORY,可以显示用于网络传输的数据转换耗时以及使用的内存量。 PostgreSQL 17 现在还会报告索引 VACUUM 的进度, 并添加了新的系统视图pg_wait_events,在与pg_stat_activity视图结合使用时可以更深入地了解活动会话的等待原因。其他功能...
select wait_event_type,wait_event,state,query,a.* from pg_stat_activity a where query like 'insert%'; 1. wait_event_type|wait_event|state |query |datid |datname|pid |leader_pid|usesysid|usename|application_name |client_addr |client_hostname|client_port|backend_start |xact_start |query...
This wait event occurs when operations write to the temporary files. For more information, see IO:BufFileRead and IO:BufFileWrite. IO:ControlFileRead A process is waiting for a read from the pg_control file. IO:ControlFileSync A process is waiting for the pg_control file to reach durable...