How to fix the Oracle error ORA-19905: log_archive_format must contain %s, %t and %r?

In this post, you’ll learn more about the Oracle ErrorORA-19905: log_archive_format must contain %s, %t and %r with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

ORA-19905: log_archive_format must contain %s, %t and %r

Reason for the Error ORA-19905: log_archive_format must contain %s, %t and %r

log_archive_format is missing a mandatory format element. Starting with Oracle 10i, archived log file names must contain each of the elements %s(sequence), %t(thread), and %r(RESETLOGS ID) to ensure that all archived log file names are unique.

How to fix the Error ORA-19905: log_archive_format must contain %s, %t and %r ?

You can fix this error in Oracle by following the below steps

Add the missing format elements to log_archive_format.