Question: How to identify if Active Data Guard (ADG) is enabled on a Standby database? The concept of an Active Data Guard, also known as Real-Time Query, is when it allows read-only access on the Physical standby node at the same time as applying archived transactions from the Primary node. For that to happen, the […]
Data Guard
How to Clone a Pluggable Database from an RMAN Container Database Backup
The following steps will show you how to perform a backup of a container database (CDB), including only the pieces required to migrate a subset of pluggable databases (PDB) with no disruption of application activity to the source PDBs. The backup and all datafiles contained in it will be consistent to a single point in […]
Oracle 12c: Unplug/Plug PDB to new CDB using RMAN Active Database Duplication
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 PDB application activity can continue while the cloning and incremental applies are being performed. To get the datafiles in […]
Oracle 12c: Migrate non-CDB and Convert to a PDB using 12c RMAN Active Database Duplication
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 […]
How to move a Datafile to a different Location on a Physical Standby Database
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 […]
Oracle Data Guard Security Enhancement – SYSDG Administration Privilege
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: […]
Oracle Data Guard 12c – Creating a Physical Standby from Primary
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 […]
Oracle 12C Enhancements for Cascaded Standby Databases
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 […]
How to Optimize a Data Guard Configuration
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) […]
Patching and Upgrading Databases in Oracle Data Guard Configuration
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. […]