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 tr
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_start |state_change |wait_event_type|wait_event |state |backend_xid|backend_xmin|query |backend_type | ...
waitstart|-[RECORD 2]---+---locktype|virtualxiddatabase|relation|page|tuple|virtualxid|3/3920transactionid|classid|objid|objsubid|virtualtransaction|3/3920pid|967262mode|ExclusiveLock granted|t fastpath|t waitstart| 输出将提供有关PostgreSQL中所有锁的信息。这可以帮助您诊断当不同的进程请求对相同...
a.wait_event_type || ': ' || a.wait_event AS wait_event, current_timestamp-a.state_change time_in_state, current_timestamp-a.xact_start time_in_xact, l.relation::regclass relname, l.locktype, l.mode, l.page, l.tuple, pg_blocking_pids(l.pid) blocking_pids, (pg_blocking_pids(...
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 ## 事务三查看锁等待 ## 可以看到28363会话正在等待27152会话 db1=# select pid,pg_blocking_pids(pid),wait_event_type,wait_event,query from pg_stat_activity ; ...
Wait Event Type Wait Event Name Description 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. Pr...
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 = '...
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...
CDW PG作为分布式数据库，执行query需要多个CN和DN交互运行，对于复杂查询，甚至会出现多层调用的情况。CN...
This event occurs when a query is waiting to acquire a lock on a table or view that's currently locked by another transaction. Lock:transactionid This event occurs when a transaction is waiting for a row-level lock. Lock:tuple This event occurs when a backend process is waiting to acquire...