Removing Unused Tokens from the Database

As you use WSO2 API Manager, the number of revoked, inactive and expired tokens accumulates in the IDN_OAUTH2_ACCESS_TOKEN table. These tokens are kept in the database for logging and audit purposes, but they can have a negative impact on the server's performance over time. Therefore, it is recommended to clean them periodically as given in the instructions below:

1. Take a backup of the running database. 

2. Set up the database dump in a test environment and test it for any issues.

   For more information on setting up a database dump, go to the MySQL, SQL Server, and Oracle offical documentation.

   Tip: We recommend you to test the database dump before the cleanup task as the cleanup can take some time.

3. Depending on your database, select the appropriate token cleanup script from here and run it on the database dump. This takes a backup of the necessary tables, turns off SQL updates, and cleans the database of unused tokens.

   Select the `token-cleanup` script to clean up the tokens, the `sessiondata-cleanup` script to cleanup the session data and the `registry-cleanup` script to clean up the registry unused data.

4. Once the cleanup is over, start the API Manager pointing to the cleaned-up database dump and test thoroughly for any issues. 
   You can also schedule a cleanup task that will automatically run after a given period of time. Here's an example:

   Replace WSO2AM_DB with the name of your API Manager database in the above script.