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...
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...
(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...
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...
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; ...
postgres=# drop table t_ret; DROP TABLE postgres=# create table t_ret(id int, info text, crt_time timestamp); CREATE TABLE postgres=# insert into t_ret values (1,’digoal’,now()), (2,’DIGOAL’,now()), (3,’digoal’,now()), (4,’abc’,now()); INSERT 0 4 postgres=# ...
select pg_last_xact_replay_timestamp(); 创建还原点: select pg_create_restore_point('20201111'); 查看表的数据文件路径,filenode: select pg_relation_filepath('test'::regclass); select pg_relation_filenode('test'); 查看表的oid: select 'test'::regclass::oid; ...
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(...
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 ---...
SELECT CURRENT_TIMESTAMP; 对比:MySQL使用NOW(),PostgreSQL使用CURRENT_TIMESTAMP。 27. 更新多个表(多表更新) MySQL UPDATE users u, orders o SET u.name = 'Updated', o.amount = 100 WHERE u.id = o.user_id AND u.id = 1; PostgreSQL ...