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Oracle 19c Active Data Guard DML Redirection Feature

19c Active DataGuard DML Redirection

ACTIVE DATAGUARD DML REDIRECTION is a new feature in Oracle 19c which enables the Data Manipulation Language (DML) operations on the Standby Server to be redirected and run on the production (Primary) database.

The updated data will be streamed back to standby to maintain redundancy.

Whenever DML we fire on standby database that operations actually executing on Primary. It might be impacted database performance so we need to avoid too many DML operation execution on standby.

 

Steps to Understand DML Redirection on Standby Database, Listed below

  1. Once DML executes on an open standby database.
  2. DML automatically redirects to the primary DB.
  3. The DML is executed on the primary DB.
  4. Then updated data is streamed back to the standby DB.
  5. Now data is available for the client.

Oracle 19c Active DataGuard DML Redirection

We have two methods to configure DML Redirection with the help of ADG_REDIRECT_DML.

  • SYSTEM-LEVEL
  • SESSION LEVEL

How to Enable DML Redirection

Using the below commands you can enable DML Redirection in Oracle 19c Active Data Guard.

Enable SYSTEM LEVEL DML Redirection

SQL> alter system set ADG_REDIRECT_DML=TRUE scope=both;

Enable SESSION LEVEL DML Redirection

SQL>alter session enable adg_redirect_dml; 

Note:- You must be remembered, the session-level redirection overwrites the system-level redirection.

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About Syed Saad Ali

As a certified and experienced Oracle Database Administrator with Almost 12 Years of Experience I am able to perform all levels of database maintenance and am fully qualified to do Oracle updates as well. Capitalizing on my interest in Business & IT both, I chose to navigate my career towards Enterprise Solutions, which has enabled me to excel in the combination of both. I have developed exceptional analytical skills that allow me to diagnose and take care of issues immediately. Extremely skilled in planning and execution of special projects in time- critical environments. Extensive knowledge in directing, coordinating and exercising concern authority for planning, organization, control and successful completions. Very skilled at solving customer relations issues by seeking first to understand and then to be understood. Effectively able to communicate with customers, vendors and management.

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