{"id":53045,"date":"2022-11-10T17:19:57","date_gmt":"2022-11-10T17:19:57","guid":{"rendered":"https:\/\/dbtut.com\/?p=53045"},"modified":"2022-11-10T17:20:12","modified_gmt":"2022-11-10T17:20:12","slug":"delayed-application-of-redos-on-the-standby-side","status":"publish","type":"post","link":"https:\/\/dbtut.com\/index.php\/2022\/11\/10\/delayed-application-of-redos-on-the-standby-side\/","title":{"rendered":"Delayed Application of Redos on the Standby Side"},"content":{"rendered":"

It may not be required to apply Redos to the Standby side immediately. In this case, the DelayMins in the Broker and the Delay parameter in the LOG_ARCHOVE_DEST_n are set and the Redos are applied late to the Standby side.<\/p>\n

LET’S TEST<\/h4>\n

1. The parameter is updated in the database where Redos are requested to be applied after a certain delay.<\/p>\n

DGMGRL> edit database 'physical' set property 'DelayMins'=1;\r\nProperty \"DelayMins\" updated\r\n<\/pre>\n
2. When the parameter is updated, the LOGs that fall into ALERT LOGs are as follows.<\/p>\n[Physical]—–>ALERT LOG<\/p>\n
ALTER DATABASE RECOVER MANAGED STANDBY DATABASE CANCEL\r\nSat Mar 04 23:21:12 2017\r\nMRP0: Background Media Recovery cancelled with status 16037\r\nSat Mar 04 23:21:12 2017\r\nErrors in file \/u01\/app\/oracle\/diag\/rdbms\/physical\/physical\/trace\/physical_pr00_17506.trc:\r\nORA-16037: user requested cancel of managed recovery operation\r\nManaged Standby Recovery not using Real Time Apply\r\nRecovery interrupted!\r\nRecovered data files to a consistent state at change 2324478\r\nSat Mar 04 23:21:12 2017\r\nErrors in file \/u01\/app\/oracle\/diag\/rdbms\/physical\/physical\/trace\/physical_pr00_17506.trc:\r\nORA-16037: user requested cancel of managed recovery operation\r\nSat Mar 04 23:21:12 2017\r\nMRP0: Background Media Recovery process shutdown (physical)\r\nSat Mar 04 23:21:13 2017\r\nManaged Standby Recovery Canceled (physical)\r\nCompleted: ALTER DATABASE RECOVER MANAGED STANDBY DATABASE CANCEL\r\nALTER DATABASE RECOVER MANAGED STANDBY DATABASE DISCONNECT  USING ARCHIVED LOGFILE\r\nSat Mar 04 23:21:13 2017\r\nAttempt to start background Managed Standby Recovery process (physical)\r\nStarting background process MRP0\r\nSat Mar 04 23:21:13 2017\r\nMRP0 started with pid=53, OS id=17538 \r\nSat Mar 04 23:21:13 2017\r\nMRP0: Background Managed Standby Recovery process started (physical)\r\nSat Mar 04 23:21:18 2017\r\n Started logmerger process\r\nSat Mar 04 23:21:18 2017\r\nManaged Standby Recovery not using Real Time Apply\r\nSat Mar 04 23:21:18 2017\r\nParallel Media Recovery started with 4 slaves\r\nSat Mar 04 23:21:18 2017\r\nWaiting for all non-current ORLs to be archived...\r\nSat Mar 04 23:21:18 2017\r\nAll non-current ORLs have been archived.\r\nSat Mar 04 23:21:18 2017\r\nMedia Recovery Waiting for thread 1 sequence 95 (in transit)\r\nCompleted: ALTER DATABASE RECOVER MANAGED STANDBY DATABASE DISCONNECT  USING ARCHIVED LOGFILE\r\nSat Mar 04 23:21:20 2017\r\nArchived Log entry 105 added for thread 1 sequence 95 ID 0x69ce60a7 dest 1:\r\nRFS[11]: Selected log 4 for thread 1 sequence 96 dbid 1775091820 branch 937609135\r\nSat Mar 04 23:21:20 2017\r\nMedia Recovery Log \/u01\/app\/oracle\/fast_recovery_area\/PHYSICAL\/archivelog\/2017_03_04\/o1_mf_1_95_dcpcyjl7_.arc\r\nMedia Recovery Waiting for thread 1 sequence 96 (in transit)\r\nSat Mar 04 23:21:21 2017\r\nArchived Log entry 106 added for thread 1 sequence 96 ID 0x69ce60a7 dest 1:\r\nSat Mar 04 23:21:21 2017\r\nPrimary database is in MAXIMUM PERFORMANCE mode\r\nRFS[12]: Assigned to RFS process (PID:17566)\r\nRFS[12]: Selected log 4 for thread 1 sequence 97 dbid 1775091820 branch 937609135\r\nSat Mar 04 23:21:21 2017\r\nMedia Recovery Log \/u01\/app\/oracle\/fast_recovery_area\/PHYSICAL\/archivelog\/2017_03_04\/o1_mf_1_96_dcpcykon_.arc\r\nMedia Recovery Waiting for thread 1 sequence 97 (in transit)\r\n<\/pre>\n
Thus, we can see what the RFS process is that meets the Redos on the standby side.<\/p>\n
[oracle@physical ~]$ ps -ef | grep rfs\r\noracle   17702 16688  0 23:26 pts\/3    00:00:00 grep rfs\r\n[oracle@physical ~]$ ps -ef | grep 17566\r\noracle   17566     1  0 23:21 ?        00:00:00 oraclephysical (LOCAL=NO)\r\noracle   17707 16688  0 23:26 pts\/3    00:00:00 grep 17566\r\n<\/pre>\n
3. Tests are passed. A table belonging to the user TEST is deleted. First, the user’s existing tables are queried.<\/p>\n
[Primary - 04-03-2017 23:34:58] SQL> select table_name from dba_tables where owner='TEST';\r\n\r\nTABLE_NAME\r\n--------------------------------------------------------------------------------\r\nDEPARTMENTS_YEDEK\r\nJOBS_YEDEK\r\nLOCATIONS_YEDEK\r\nREGIONS_YEDEK\r\nEMPLOYEES_YEDEK\r\n<\/pre>\n
[Physical - 04-03-2017 23:34:58] SQL> select table_name from dba_tables where owner='TEST';\r\n\r\nTABLE_NAME\r\n--------------------------------------------------------------------------------\r\nDEPARTMENTS_YEDEK\r\nJOBS_YEDEK\r\nLOCATIONS_YEDEK\r\nREGIONS_YEDEK\r\nEMPLOYEES_YEDEK\r\n<\/pre>\n
[Logical - 04-03-2017 23:34:58] SQL> select table_name from dba_tables where owner='TEST';\r\n\r\nTABLE_NAME\r\n--------------------------------------------------------------------------------\r\nDEPARTMENTS_YEDEK\r\nLOCATIONS_YEDEK\r\nREGIONS_YEDEK\r\nJOBS_YEDEK\r\nEMPLOYEES_YEDEK\r\n<\/pre>\n
4. We DROP one of the tables.<\/p>\n
[Primary - 04-03-2017 23:35:03] SQL> drop table test.DEPARTMENTS_YEDEK;\r\n\r\nTable dropped.\r\n\r\n[Primary - 04-03-2017 23:35:17] SQL> select table_name from dba_tables where owner='TEST';\r\n\r\nTABLE_NAME\r\n--------------------------------------------------------------------------------\r\nJOBS_YEDEK\r\nLOCATIONS_YEDEK\r\nREGIONS_YEDEK\r\nEMPLOYEES_YEDEK\r\n<\/pre>\n
[Physical - 04-03-2017 23:35:03] SQL> select table_name from dba_tables where owner='TEST';\r\n\r\nTABLE_NAME\r\n--------------------------------------------------------------------------------\r\nDEPARTMENTS_YEDEK\r\nJOBS_YEDEK\r\nLOCATIONS_YEDEK\r\nREGIONS_YEDEK\r\nEMPLOYEES_YEDEK\r\n<\/pre>\n
[Logical - 04-03-2017 23:35:03] SQL> select table_name from dba_tables where owner='TEST';\r\n\r\nTABLE_NAME\r\n--------------------------------------------------------------------------------\r\nLOCATIONS_YEDEK\r\nREGIONS_YEDEK\r\nJOBS_YEDEK\r\nEMPLOYEES_YEDEK\r\n<\/pre>\n
Even if we wait a few minutes, the Physical Standby shows that the table is not DROP. The reason is that Real-Time APPLY is disabled. Archive Apply is activated.<\/p>\n
5. By performing the Log Switch operation, Redo, which hosts the DROP operation, is transferred to the Stanbdy side.<\/p>\n
[Primary - 04-03-2017 23:38:11] SQL> alter system switch logfile;\r\n\r\nSystem altered.\r\n<\/pre>\n[Physical]—–>ALERT LOG<\/p>\n
Sat Mar 04 23:38:30 2017\r\nArchived Log entry 107 added for thread 1 sequence 97 ID 0x69ce60a7 dest 1:\r\nSat Mar 04 23:38:30 2017\r\nARC5: Archive log thread 1 sequence 97 available in 1 minute(s)\r\nSat Mar 04 23:38:30 2017\r\nRFS[12]: Selected log 4 for thread 1 sequence 98 dbid 1775091820 branch 937609135\r\nSat Mar 04 23:38:30 2017\r\nMedia Recovery Delayed for 1 minute(s) (thread 1 sequence 97)\r\n<\/pre>\n
6. After 1 minute, we check if the table is DROP.<\/p>\n
[Physical - 04-03-2017 23:41:48] SQL> select table_name from dba_tables where owner='TEST';\r\n\r\nTABLE_NAME\r\n--------------------------------------------------------------------------------\r\nJOBS_YEDEK\r\nLOCATIONS_YEDEK\r\nREGIONS_YEDEK\r\nEMPLOYEES_YEDEK\r\n<\/pre>\n[Physical]—–>ALERT LOG<\/p>\n
Sat Mar 04 23:39:30 2017\r\nMedia Recovery Log \/u01\/app\/oracle\/fast_recovery_area\/PHYSICAL\/archivelog\/2017_03_04\/o1_mf_1_97_dcpdyp23_.arc\r\nResize operation completed for file# 3, old size 778240K, new size 788480K\r\nMedia Recovery Waiting for thread 1 sequence 98 (in transit)\r\n\r\n\r\n<\/pre>\n
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<\/div>\n","protected":false},"excerpt":{"rendered":"
It may not be required to apply Redos to the Standby side immediately. In this case, the DelayMins in the Broker and the Delay parameter in the LOG_ARCHOVE_DEST_n are set and the Redos are applied late to the Standby side. LET’S TEST 1. The parameter is updated in the database where Redos are requested to …<\/p>\n
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