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...
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 ...
wait_event_type表示进程正在等待的事件类型,如果没有等待显示为空;可能的取值包括 LWLock、Lock、BufferPin、Activity、Extension、Client、IPC、Timeout 以及 IO; wait_event表示进程正在等待的事件名称,如果没有等待显示为空; query是进程最后一次执行的查询语句。对于 active 状态,显示正在执行的查询;其他状态显示上一...
wait_event_type | wait_event | IO | DataFileRead --这是在官网找到的,是在等待数据读到PostgreSQL的内部缓存。 再接下来,background worker的两条SQL语句消失了,client backend的SQL语句变成在等待BgWorkerShutdown | IPC | BgWorkerShutdown 查询数据的SQL语句中有两个子查询,对照pg_stat_activity的输出推测,...
This type of event occurs when Aurora PostgreSQL is keeping a session open to complete multiple transactions that involve the same row in a table. The wait event denotes which aspect of multiple transaction processing is generating the wait event, that is, LWLock:MultiXactOffsetSLRU, LWLock:MultiX...
等待的对象的锁的值(Lock在wait_event_type列)。 等待轻量级锁 ( LWLock)。 等待缓冲引脚 ( BufferPin)。 但是进程也可以等待其他事件: IO当进程需要读取或写入数据时,等待输入/输出 ( ) 发生。 进程可以等待来自客户端 ( Client) 或另一个进程 ( IPC)所需的数据。
wait_event将标识特定的等待点。 IPC服务器进程正在等待来自服务器中另一个进程的某种活动。wait_event将标识特定的等待点。 Timeout服务器进程正在等待超时发生。wait_event将标识特定的等待点。 IO服务器进程正在等待IO完成。wait_event将标识特定的等待点。 wait_event text 如果后端当前正在等待,则是等待事件的...
wait_event将标识特定的等待点。 IPC服务器进程正在等待来自服务器中另一个进程的某种活动。wait_event将标识特定的等待点。 Timeout服务器进程正在等待超时发生。wait_event将标识特定的等待点。 IO服务器进程正在等待IO完成。wait_event将标识特定的等待点。 wait_event text 如果后端当前正在等待,则是等待事件的...
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...
6、引起epoch_wait的PG调用WaitEventSetWait src/backend/storage/ipc/latch.c /* * Wait for events added to the set to happen, or until the timeout is * reached. At most nevents occurred events are returned. * * If timeout = -1, block until an event occurs; if 0, check sockets for...