This event occurs when a thread is active in CPU or is waiting for CPU. IO:BufFileRead and IO:BufFileWrite These events occur when Aurora PostgreSQL creates temporary files. IO:DataFileRead This event occurs when a connection waits on a backend process to read a required page from storage ...
IO:BufFileRead When operations require more memory than the amount defined by working memory parameters, the engine creates temporary files on disk. This wait event occurs when operations read from the temporary files. For more information, see IO:BufFileRead and IO:BufFileWrite. IO:BufFileWrite...
Wait Event TypeWait Event NameDescription LWLock ShmemIndexLock Waiting to find or allocate space in shared memory. OidGenLock Waiting to allocate or
Waiting for a read from a buffered file. BufFileWrite Waiting for a write to a buffered file. ControlFileRead Waiting for a read from the control file. ControlFileSync Waiting for the control file to reach stable storage. ControlFileSyncUpd...
IO BufFileRead 正等待从缓存的文件中读取。 BufFileWrite 正等待向缓存的文件中写入。 ControlFileRead 正等待从控制文件中读取。 ControlFileSync 正等待控制文件到达稳定存储。 ControlFileSyncUpdate 正等待对控制文件的更新到达稳定存储。 ControlFileWrite 正等待对控制文件的写入。 ControlFileWriteUpdate 正等待写操...
IO BufFileRead 正等待从缓存的文件中读取。 BufFileWrite 正等待向缓存的文件中写入。 ControlFileRead 正等待从控制文件中读取。 ControlFileSync 正等待控制文件到达稳定存储。 ControlFileSyncUpdate 正等待对控制文件的更新到达稳定存储。 ControlFileWrite 正等待对控制文件的写入。 ControlFileWriteUpdate 正等待写操...
io = false; lrq->completed++; break; } lrq->head++; if (lrq->head == lrq->size) lrq->head = 0; } } /* * A callback that examines the next block reference in the WAL, and possibly * starts an IO so that a later read will be fast. * * Returns LRQ_NEXT_AGAIN if no ...
=seekpos;// 写入FileWrite(v->mdfd_vfd,buffer,BLCKSZ,WAIT_EVENT_DATA_FILE_EXTEND);}else{...}TerminateBufferIO(bufHdr,false,BM_VALID);...returnBufferDescriptorGetBuffer(bufHdr);}
SELECT pid, wait_event_type, wait_event FROM pg_stat_activity; 备注:通过以上表格, wait_event_type 主要分类四类: LWLockNamed:表示backend后台进程等待某种特定的轻量级锁; LWLockTranche:表示backend后台进程等待一组相关轻量级锁; Lock:表示backend后台进程等待重量级的锁,通常是指 relation、tuple、page、transac...
4、recoveryWakeupLatch在epoll_wait的时候,等的是Pipe的读端,应用了上面提到的self-pipe trick。 LF 等锁WaitLatchOrSocket流程总结: 0、(补充)WL_LATCH_SET时在AddWaitEventToSet中要监听的fd是selfpipe_readfd,也就是上面创建的管道读端,应用self-pipe trick ...