(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...
static void ProcessWalSndrMessage(XLogRecPtr walEnd, TimestampTz sendTime) { WalRcvData *walrcv = WalRcv; TimestampTz lastMsgReceiptTime = GetCurrentTimestamp(); /* Update shared-memory status */ SpinLockAcquire(&walrcv->mutex); if (walrcv->latestWalEnd < walEnd) walrcv->latestWalEnd...
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...
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...
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; ...
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(...
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 ...
SELECT CURRENT_TIME; Output: current_time --- 21:02:13.648512-05 (1 row) Note that both CURRENT_TIMESTAMP and CURRENT_TIME return the current time with the time zone. To get the time of day in the string format, you use the timeofday() function. SELECT TIMEOFDAY(); timeofday ---...
ProcSleep ResolveRecoveryConflictWithLock if (GetCurrentTimestamp() >= ltime && ltime != 0) VirtualTransactionId *backends; backends = GetLockConflicts(&locktag, AccessExclusiveLock); ResolveRecoveryConflictWithVirtualXIDs(backends, PROCSIG_RECOVERY_CONFLICT_LOCK, false) VirtualTransactionId是什么?
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...