postgres=#selectpg_sleep_for('10 seconds'); pg_sleep_for --- (1 row) postgres=#selectnow(),current_time,current_timestamp,localtime,localtimestamp,transaction_timestamp(); now |current_time|current_timestamp| localtime | localtimestamp | transaction_timestamp ---+---+---+---+---+...
postgres=# begin;BEGINpostgres=# select now(),current_time,current_timestamp,localtime,localtimestamp,transaction_timestamp();now|current_time|current_timestamp|localtime|localtimestamp|transaction_timestamp---+---+---+---+---+---2021-01-2216:50:46.917081+08|16:50:46.917081+08|2021-01-...
image: busybox:latest #因为busybox默认是启动的sh命令,我们可以给shell命令传递些参数。 command: (["/bin/sh","-c","sleep 20"]) 传递的参数可以使用[]来写,也可以用下面的形式来定义) - "/bin/sh" - "-c" - "sleep 3600" 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. ...
TimeUnit.SECONDS.sleep(5);// 修改// 语法:UPDATE [ ONLY ] 表名 [ * ] [ [ AS ] 别名 ] ...// int ret3 = stmt.executeUpdate("UPDATE TABLE tab1 SET name = 's.boot.modified' WHERE id = 3;");intret3=stmt.executeUpdate("UPDATE tab1 SET name = 's.boot.modified' WHERE id = ...
BEGIN; UPDATE messages SET status = 'archived'; SELECT pg_sleep(15); COMMIT; 将SQL执行延迟15秒的简单方法 现在,运行locksSQL 应该会返回类似的输出: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 relname | mode | query_snippet --- messages | RowExclusiveLock | UPDATE "messages" SET "stat...
但需要注意的是,此种方式由于比较直接,不管是否数据库有无IO情况,因此,备份的时候需要先停止数据库,恢复的时候要删除原数据库文件,重新覆盖回去后,才可以在启动数据库,如果在数据库启动的时候备份,那么,可能会造成数据备份不全,也可以理解为冷备方式。
digoal@digoal-Haier5000A-> pg_test_fsync 5 seconds per test O_DIRECT supported on this platform for open_datasync and open_sync. Compare file sync methods using one 8kB write: (in wal_sync_method preference order, except fdatasync is Linux's default) open_datasync 48690.840 ops/sec 21 ...
SQL2="select count(1) as delay_time from sr_delay where now()<(last_alive + interval '${sr_allowed_delay_time} seconds');"#SQL2="select count(1) as delay_time from sr_delay where now()<(last_alive + interval '100 seconds');" sleep $sr_allowed_delay_timedb_role=`echo $SQL1...
postgres@digoal-> psql -h 127.0.0.1 -p 1922 postgres=# select * from test1; id --- 1 2 3 4 5 6 7 8 9 10 (10 rows) 主实例执行检查点后,控制文件状态会改回生产状态。 psql -p 1921 postgres=# checkpoint; CHECKPOINT postgres@digoal-> pg_controldata |grep state Database cluster stat...
12:00:00,120000,12:00 8:00 AM,8:00 PM 时间间隔 interval [fields][(p)]我还是⽐较喜欢明确的时间间隔表⽰⽅法，如：1 year 2 months 3 days 4 hours 5 minutes 6 seconds 可以⽤单词复数，也可以不⽤ test=# select interval '1 year 2 months 3 days 4 hours 5 minutes 6 seconds'...