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 […]
oracle 12c
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 Disable Oracle Net Tracing without stopping server process
When Oracle Net server tracing is invoked using sqlnet.ora (see example below) tracing on the affected server processes will continue throughout the process lifetime. If tracing needs to be stopped without stopping the server process the following method can be used. Example: static server tracing using sqlnet.ora trace_level_server = 16 trace_directory_server = /tmp diag_adr_enabled = […]
Oracle 12c New Feature: LREG Background Process
Instance registration in Oracle Net 12c behaves differently. In 12c and higher, there is a new background process called ora_lreg_sid-name. In previous releases, PMON always handled instance registration logic. In 12c, LREG (Listener REGistration) now takes over with the instance registration logic. LREG (Listener REGistration) – Registers instance information with the listener. – It is […]
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. […]
How to Configure client connectivity in Oracle Data Guard configuration (Implement failover procedures)
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 […]