About of Database Systems and Information Technologies
Oracle Data Guard ensures high availability, data protection, and disaster recovery for enterprise data. Oracle Data Guard provides a comprehensive set of services that create, maintain, manage, and monitor one or more standby databases to enable production Oracle databases to survive disasters and data corruptions. Oracle Data Guard maintains these standby databases as copies of…
Oracle Data Guard ensures high availability, data protection, and disaster recovery for enterprise data. Oracle Data Guard provides a comprehensive set of services that create, maintain, manage, and monitor one or more standby databases to enable production Oracle databases to survive disasters and data corruptions. Oracle Data Guard maintains these standby databases as copies of…
Oracle Data Guard ensures high availability, data protection, and disaster recovery for enterprise data. Oracle Data Guard provides a comprehensive set of services that create, maintain, manage, and monitor one or more standby databases to enable production Oracle databases to survive disasters and data corruptions. Oracle Data Guard maintains these standby databases as copies of…
You can use flashback technology on standby side. If you want to make application test on database, you can use data guard as read write mode temporarily with flashback technology. You can create a restore point on standby side then you can do any transaction on standby side to test or any other purpose. After…
You can use the same steps to switchover for single data guard or multiple data guard configuration. Switchover operation will convert primary side to data guard and data guard to primary side. You have to control listeners whether it is running before switchover steps. Switchover Steps Primary Side SQL> alter system archive log current; SQL>…
Important situations of Oracle Data Guard Nologging or unrecoverable operations are not applied to standby – so be cautious in using those options. Alarming data block corruption error messages are reported if a user attempts to access any nologging or unrecoverable data blocks. ‘Drop tablespace’, ‘drop datafile’, ‘rename datafile’, and add/drop online redo log files…
If you want to use real-time apply Oracle Data Guard, you have to add standby logfile to standby database. Show Logfiles Before Add SQL> select * from gv$logfile; INST_ID GROUP# STATUS TYPE MEMBER IS_RECOVERY_DEST_FILE 1 3 ONLINE +DATA/testdb/onlinelog/group_3.14134123 NO 1 1 ONLINE +DATA/testdb/onlinelog/group_1.35116731 NO 1 2 ONLINE +DATA/testdb/onlinelog/group_2.32513245 NO 1 4 ONLINE +DATA/testdb/onlinelog/group_4.12255335 NO 1…