PgStartTime = GetCurrentTimestamp(); /* *在postmaster.pid文件中记录postmaster状态,以告知pg_ctl */ AddToDataDirLockFile(LOCK_FILE_LINE_PM_STATUS, PM_STATUS_STARTING); /* * 启动数据库并记录pid、设置状态 */ StartupPID = StartupDataBase(); Assert(StartupPID != 0); StartupStatus = START...
Returns zero (a time safely in the past) if we are willing to wait forever. */ static TimestampTz GetStandbyLimitTime(void) { TimestampTz rtime; bool fromStream; /* * The cutoff time is the last WAL data receipt time plus the appropriate delay variable. Delay of -1 means wait foreve...
(4) 用case()函数进行类型转换。 Select cast(current_timestamp(0) as timestamp without time zone) (5) 对精度进行对比可以看到(p)是精度 Select current_timestamp(2)::timestamp without time zone Select current_timestamp(6)::timestamp without time zone...
TimestampTz lastMsgReceiptTime = GetCurrentTimestamp(); /* Update shared-memory status */ SpinLockAcquire(&walrcv->mutex); if (walrcv->latestWalEnd < walEnd) walrcv->latestWalEndTime = sendTime; // 如果发送过来的消息有xlog,则最近接收xlog的时间latestWalEndTime需要更新 walrcv->latestWalEnd...
temp_loint,--最低温度temp_hiint,--最高温度prcpreal,--湿度date date ); 二、创建触发器函数 createorreplacefunctiontable_update_notify()returnstriggeras$$beginperform pg_notify('table_update',json_build_object('table',TG_TABLE_NAME,'timestamp',current_timestamp)::text);returnnew;end; ...
ResolveRecoveryConflictWithLockif(GetCurrentTimestamp()>=ltime&<ime!=0)VirtualTransactionId*backends;backends=GetLockConflicts(&locktag,AccessExclusiveLock);ResolveRecoveryConflictWithVirtualXIDs(backends,PROCSIG_RECOVERY_CONFLICT_LOCK,false) VirtualTransactionId是什么?
s->state=TRANS_PREPARE;prepared_at=GetCurrentTimestamp(); 构造GlobalTransactionData:MarkAsPreparing 加锁:TwoPhaseStateLock freelist中取一个Data:gxact = TwoPhaseState->prepXacts[i]; 构造Data、补全MYPROC、MyLockedGxact指向当前Data:MarkAsPreparingGuts ...
recovery_target_time (timestamp) This parameter specifies thetimestamp uptowhich recovery will proceed. At most oneofrecovery_target_time, recovery_target_nameorrecovery_target_xid can be specified. Thedefaultistorecovertotheendofthe WALlog. ...
lock.locktag_lockmethodid, lockmode); TimestampDifference(get_timeout_start_time(DEADLOCK_TIMEOUT), GetCurrentTimestamp(), &secs, &usecs); msecs = secs * 1000 + usecs / 1000; usecs = usecs % 1000; if (deadlock_state == DS_SOFT_DEADLOCK) ereport(LOG, (errmsg(...
Code:设置完成General就可以开始设置Code选项,这个就是我们定时任务要执行的语句,这个语句可以是非常简单的,想我们的查询当前时间select current_timestamp;也可以是非常复杂的SQL,如定时汇总数据并插入到另一张表。 第三步:设置 Schedules 设置好了具体的任务信息之后,就可以设置任务的定时调度。Schedules页签与Steps页...