Data Guard

This method takes advantage of a new feature of RMAN in 12c allowing you to clone database files and apply incrementals to those files from an active database without requiring staging areas. In addition, the source non-CDB application activity can continue while the cloning and incremental applies are being performed. When ready to perform the […]

Sometimes it is necessary to move a Datafile to another Location (eg. Mountpoint, ASM Diskgroup) due to Space issues, Hardware Replacement, or Performance Reasons. There are several Possibilities to perform this Task explained below: Physical Standby Database is mounted We can copy and rename the Datafile while Managed Recovery is stopped. If the Physical Standby […]

Starting with Oracle 12c you can grant the ‘SYSDG’ Administration Privilege to a User so they can perform Data Guard-related operations including using Data Guard Broker. It is no longer necessary to use SYS or SYSDBA for Data Guard Administration. Just grant this Privilege to a User in SQL*PLUS: SQL> grant sysdg to [USER]; Example: […]

For the purposes of this post, the following environment is used as an example to describe the procedure: Primary db_name and db_unique_name: BOSTON Standby db_name: BOSTON (same as primary db_name) Standby db_unique_name: CHICAGO Directory: /u01/app/oracle Note: We cannot create a physical standby at PDB(plugable Database) level. It should be at CDB(Container Database) level i.e entire […]

This post explains the Enhancements for Cascaded Standby Databases in Oracle 12c. There are new Possibilities for cascading Standby Databases in Oracle 12c. The main Differents between Oracle 12c and the previous Releases are: Real-Time Cascading Far Sync Standby Database Data Guard Broker now supports cascaded Standby Database However, you can still only cascade a […]

In this post, we will see how to monitor the configuration performance of data guard along with optimization of SQL apply and redo transport for best performances. Monitoring Configuration Performance by Using Enterprise Manager Cloud Control Graphical charts on the Performance Overview page: Redo Generation Rate: Shows the redo generation rate (in KB per second) […]

Data Guard Standby-First Patch Apply A typical database patch consists of two main steps: step 1) patch installation consisting of patching the Oracle Database Home or Grid Infrastructure Home or both. step 2) patch post-installation consisting of running SQL scripts or SQL commands. A Standby-First Patch only executes step 1 to a physical standby environment. […]

Connecting to the Appropriate Environment A physical standby database not using Active Data Guard maintains the database in a mounted mode and would not normally allow listener connections for normal users. However, with Active Data Guard, the database is open read-only to allow reporting against the physical standby. Also, the addition of logical standby databases […]

Using RMAN to Back Up and Restore Files in a Data Guard Configuration Recovery Manager (RMAN) can be used to back up and recover a standby database. Backups that you make on a physical standby database are usable at a primary database or another standby database. A recovery catalog is required when you use RMAN […]

Fast-start failover enables the Data Guard broker to rapidly and automatically failover to a previously chosen standby database without requiring manual intervention. This feature increases the availability of your database in the event of a disaster by reducing the need for you to perform a failover operation manually. Fast-start failover can only be used in […]