Log Archive Destination Full How to Handle the Situation

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In the world of database management, running into issues with log archive destination full is a common occurrence. The moment your database hangs due to an archive destination being filled to capacity, your entire system can grind to a halt. So, how do you handle this situation and get your database up and running smoothly again? In this article, we will explore the most commonly used solutions to address this issue, step by step.

The Common Issues

Before we dive into the solutions, let’s first understand the common issues that can arise when facing a log archive destination full scenario. There are three main scenarios:

  1. When the log archive destination is full, preventing any further transactions.
  2. When the database hangs due to the archive destination being full.
  3. When the Flash Recovery Area (FRA) is full, causing obstacles in the functioning of the database.

The Four Common Solutions

To tackle these issues, there are four commonly used solutions that we will discuss in detail.

1. Delete Older Archives

If you no longer need older archive logs, one of the simplest solutions is to delete them. You can connect to your admin point and delete the archives that are no longer required. This will free up space in the Flash Recovery Area (FRA) and allow your database to continue functioning smoothly.

2. Increase Archive Destination Size

If your mount point still has some extra space available, you can increase the size of your archive destination. By doing so, you provide more storage capacity for your archive logs to be generated. This will prevent your database from becoming hung and ensure the smooth flow of transactions.

3. Change Archive Destination

Sometimes, the archive destination itself is full, with no archive logs that can be deleted. In such cases, the best solution is to change the archive destination to another mount point that has enough space. By redirecting the archive logs to a new location, you can resolve the hang and enable your database to function normally.

4. Temporarily Move Archives

In rare cases where none of the above solutions work, you can resort to moving the archives temporarily using the OS command. By executing an OS command, you can move the archives to a temporary location, freeing up space in the archive destination. Once the space issue is resolved, you can move the archives back to their original location.

Step-by-Step Demonstration

Now, let’s walk through each of these solutions in a step-by-step manner to better understand how to implement them effectively.

Solution 1: Deleting Older Archives

  1. Connect to your admin point and locate the archive log files that you wish to delete.
  2. Using the admin command, cross-check for any expired archives or absolute backups.
  3. Delete any expired backup and archive logs by running the relevant admin command.
  4. Verify that the space has been released in the Flash Recovery Area.

Solution 2: Increasing Archive Destination Size

  1. Check the usage of the Flash Recovery Area using the v$recovery_area view.
  2. Determine the current space used and calculate the space required to accommodate the archive logs.
  3. Increase the size of the archive destination using the ALTER SYSTEM command.
  4. Verify the new size of the archive destination and monitor the usage in the alert log.

Solution 3: Changing Archive Destination

  1. Identify a mount point that has sufficient space to accommodate the archive logs.
  2. Alter the archive destination to the new mount point using the ALTER SYSTEM command.
  3. Verify the new archive destination configuration and ensure that transactions can now be processed smoothly.

Solution 4: Temporarily Moving Archives

  1. Execute an OS command to temporarily move the archives from the archive destination to a different location.
  2. Resolve the space issue in the original archive destination by freeing up space.
  3. Move the temporarily stored archives back to the archive destination location.

Conclusion

Dealing with log archive destination full scenarios can be a challenging task, but armed with the right knowledge and solutions, you can quickly and effectively resolve the issue. By following the step-by-step process outlined in this article, you can ensure the smooth functioning of your database and avoid any downtime or interruptions to your operations.

Remember, regularly monitoring and managing your archive destination is essential to prevent this issue from occurring in the first place. By staying proactive and implementing the appropriate solutions, you can ensure the optimal performance and reliability of your database system.