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Published Jul. 2, 2025

Impact of deleting/cleaning up 'pg_largeobject' table on the Portal

Written By

Prarthana Jadhav

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Issue

  • After migration from DBstore to any other repository, how to delete the 'pg_large object' table from PostgreSQL.
  • Will the deletion of the pg_large table have any impact on the portal?

Environment

  • Liferay DXP 7.0
  • Database: PostgreSQL

Resolution

  • As the data will already be migrated to another repository apart from DBstore, the 'pg_largeobject' will have no relevance on the portal. Therefore, it can be deleted/cleared.  
  • However, Liferay does not recommend to manually perform any action in DB. Therefore, follow the below steps to clear the pg_largeobject table data:
    1)Migrate back to the DB Store by selecting "com.liferay.portal.store.db.DBstore". Shut down the server 
    2) Add the property "dl.store.impl=com.liferay.portal.store.db.DBStore" in portal-ext.properties and restart the server.
    3) Go to the Control panel ->Data Migration -> Migrate back to "respective repository" by selecting from the dropdown-> Make sure you check the option "Delete data from Previous repository". 

    migrate.PNG
  • By checking this option, the data will be deleted from the pg_large table safely.
  • Therefore, deleting this table will not impact the portal as it will not have any relation with the portal post migration.

Additional Information

  • Please note:
    1. Take the back up of the database before performing the migration task. 
    2. We highly recommend to test the above-suggested approach in a lower environment and then move it to production as per your discretion if you feel comfortable with it.
    3. As the above activity requires restart of the portal, perform the activity in server downtime.
  • Document Repository Configuration
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