I received the following error in a primary database's alert log that I was supporting recently. ORA-00312: online log 5 thread 1: '+DATA/db_name/onlinelog/group_5.297.846947859' ORA-00338: log 5 of thread 1 is more recent than control file The database has a DataGuard environment as well and below are the steps that I took to resolve the issue. 1. First, I checked the status of the redo logs and their current sizes and status. SQL> select group#,bytes/1024/1024,status from v$log; GROUP# BYTES/1024/1024 STATUS ---------- --------------- ---------------- 1 50 INACTIVE 2 50 INACTIVE 3 50 INACTIVE 4 250 INACTIVE 5 250 INACTIVE 6 250 CURRENT 2. As you can see, groups 1, 2, 3 have 50 MB redo log group sizes while group 4, 5, 6 are 250 MB redo log group sizes. This is something that I highly suspect was/is the issue. So I
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