How do I clear the buffer cache in AWS RDS oracle?

To clear the buffer cache in AWS RDS Oracle, you can try running the following command as the RDS superuser:

EXEC rdsadmin.rdsadmin_util.flush_buffer_cache;

Note that this command requires superuser privileges, so you may need to grant yourself the necessary permissions before running it. Additionally, you may need to run the command in a specific schema, such as rdsadmin, to avoid the ORA-00900 error.

If you are unable to run the command or are still encountering errors, you can try using the ALTER SYSTEM command instead:

ALTER SYSTEM FLUSH BUFFER_CACHE;

This command may require the ALTER SYSTEM privilege, which you can grant to yourself using the GRANT statement. For example:

GRANT ALTER SYSTEM TO myuser;

Keep in mind that clearing the buffer cache can have a negative impact on database performance, so it should only be done as a last resort and under the guidance of a qualified DBA.