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V$DATAGUARD_STATS视图提供了重做传输和重做应用进程落后多远的信息。
在物理备库执行以下SQL脚本:
COL NAME FOR A13
COL VALUE FOR A20
COL UNIT FOR A30
SET LINES 122
SELECT NAME,VALUE,UNIT,TIME_COMPUTED
FROM V$DATAGUARD_STATS
WHERE NAME IN ('transport lag','apply lag');
SQL> COL NAME FOR A13
SQL> COL VALUE FOR A20
SQL> COL UNIT FOR A30
SQL> SET LINES 122
SQL> SELECT NAME,VALUE,UNIT,TIME_COMPUTED
2 FROM V$DATAGUARD_STATS
3 WHERE NAME IN ('transport lag','apply lag');
SQL> select name,value,unit,time_computed from v$dataguard_stats
2 where name in('transport lag','apply lag')
3 ;
NAME VALUE UNIT TIME_COMPUTED
-------------------------------- ------------------------------ ------------------------------ ------------------------------
transport lag +00 00:00:00 day(2) to second(0) interval 11/28/2023 15:25:44
apply lag +00 00:00:40 day(2) to second(0) interval 11/28/2023 15:25:44
transport lag的00:00:00传输滞后值表明,从主数据库到物理备库的重做数据传输落后0秒。
如果主数据库上发生了灾难,您失去了主站点,就要容忍损失0秒的数据,没有数据丢失;或者,如果想要执行切换,需要等待0秒,无需等待。
注意,应用滞后值00:00:40表明,应用滞后了40秒钟。应用滞后值反应了ARCHIVE_LOG_DEST_n参数中30分钟的DELAY特性。
还可以用这条语句查询dg延迟监控
SQL> select to_char(sysdate,'yyyymmdd hh24:mi:ss') ctime,name,value,unit,time_computed from v$dataguard_stats;
CTIME NAME VALUE UNIT TIME_COMPUTED
----------------- -------------------------------- ------------------------------ ------------------------------ ------------------------------
20231128 15:25:48 transport lag +00 00:00:00 day(2) to second(0) interval 11/28/2023 15:25:48
20231128 15:25:48 apply lag +00 00:00:44 day(2) to second(0) interval 11/28/2023 15:25:48
20231128 15:25:48 apply finish time +00 00:00:00.058 day(2) to second(3) interval 11/28/2023 15:25:48
20231128 15:25:48 estimated startup time 10 second 11/28/2023 15:25:48
SQL> select process,status,thread#,sequence#,block#,blocks from v$managed_standby;
PROCESS STATUS THREAD# SEQUENCE# BLOCK# BLOCKS
--------- ------------ ---------- ---------- ---------- ----------
ARCH CLOSING 1 117249 1 24
ARCH CLOSING 1 117252 192512 1095
ARCH CLOSING 1 117251 32768 337
ARCH CONNECTED 0 0 0 0
RFS IDLE 0 0 0 0
RFS IDLE 1 117253 48576 344
RFS IDLE 0 0 0 0
MRP0 WAIT_FOR_LOG 1 117253 0 0
RFS IDLE 0 0 0 0
9 rows selected.
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