ARCHIVELOG DELETION POLICY TO APPLIED ON STANDBY

Introduction

In Oracle databases, enabling archiving is crucial for data protection and disaster recovery. Archive logs contain a record of all changes made to the database, which allows for point-in-time recovery in case of failures. However, managing archive logs and applying deletion policies is important to prevent the archive log destination from filling up.

In this article, we will explore how to set up an archivelog deletion policy to be applied on a standby database in an Oracle Data Guard environment. We will walk through the steps of configuring the deletion policy and provide code examples to help you implement this feature effectively.

Setting up Archivelog Deletion Policy on Standby

To set up an archivelog deletion policy on a standby database, you can use the RMAN (Recovery Manager) utility to configure the policy. This allows you to automatically delete archive logs based on certain criteria such as age or redundancy.

Here's a step-by-step guide to configuring the archivelog deletion policy:

  1. Connect to the standby database using RMAN:
$ rman target sys/password@standby
  1. Set the archivelog deletion policy using the CONFIGURE ARCHIVELOG DELETION POLICY command:
RMAN> CONFIGURE ARCHIVELOG DELETION POLICY TO APPLIED ON STANDBY;
  1. Verify the deletion policy settings:
RMAN> SHOW ARCHIVELOG DELETION POLICY;
  1. Optionally, you can also specify additional criteria for archivelog deletion, such as redundancy or time-based retention:
RMAN> CONFIGURE ARCHIVELOG DELETION POLICY TO APPLIED ON STANDBY BACKED UP 1 TIMES TO DISK RECOVERY WINDOW OF 7 DAYS;

By applying the deletion policy to standby, you ensure that archive logs are only deleted once they have been applied to the standby database, preventing any data loss in case the logs are needed for recovery.

Gantt Chart for Archivelog Deletion Policy Implementation

gantt
    title Archivelog Deletion Policy Implementation

    section Configuration
    Connect to Standby: done, 2022-01-01, 1d
    Set Deletion Policy: done, after Connect to Standby, 1d
    Verify Policy Settings: done, after Set Deletion Policy, 1d
    Specify Additional Criteria: done, after Verify Policy Settings, 1d

Conclusion

Setting up an archivelog deletion policy to be applied on a standby database is a critical aspect of managing archive logs in an Oracle Data Guard environment. By configuring the deletion policy, you can ensure that archive logs are properly managed and deleted based on specific criteria, preventing the archive log destination from becoming full.

In this article, we have provided a guide on how to configure the archivelog deletion policy using RMAN and highlighted the importance of applying the policy on the standby database. By following these steps and implementing the deletion policy effectively, you can ensure the integrity and reliability of your data protection and disaster recovery strategies in Oracle databases.