RDS Oracle storage allocated larger than source instance

Hello.

It sounds like you're observing unexpected storage behavior with one of your Oracle RDS read replicas. Connect to the problematic read replica using an SQL client and execute the following query to check the size of each tablespace and its datafiles:

SELECT
    df.tablespace_name "Tablespace",
    ROUND(SUM(df.bytes) / 1024 / 1024) "Size (MB)",
    ROUND(MAX(df.bytes) / 1024 / 1024) "Max Datafile Size (MB)"
FROM
    dba_data_files df
GROUP BY
    df.tablespace_name;

Check for Backups and Snapshots: It's possible that backups or snapshots are consuming additional storage. Check the "Automated Backups" and "Snapshots" sections in the RDS dashboard for this replica.

Best regards, Andrii

Hello Andrii

It seems that datafiles are ok. I also run the commands to crosscheck the archives, and clear the bdump folder, and near 5 TB has been cleared. I think an application generates a lot of trace files. I set their retention to a minimum.

Thank you.

Could you please accept the answer if it helped for you? Regards, Andrii

Hello,

I am glad that by clearing the trace files you were able to reclaim the storage back. Trace and dump files can accumulate and consume disk space. By default, Amazon RDS purges trace and dump files that are older than seven days. You can always change the retention period to avoid high disk usage.

Kindly let me know if you have any other doubt/query.

Thanks and Regards, Nishant Kumar