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When Redo Log Files Are All Missing

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If your redo logs are all missing, then you have to know you will lose some data and no longer to recover it. Now let's mount the database, I mean you can only startup the database to mount state, and let the control file knows all the situation.
SQL> startup mount;
ORACLE instance started.
Database mounted.

Recover the database until cancel
SQL> recover database until cancel;

Open the database with resetlogs which implies that we discard all of the missing redo logs and  try to start it over.
SQL> alter database open resetlogs;

Database altered.

Check the redo logs again
[oracle@test ~]$ ll /u01/app/oracle/oradata/compdb
-rw-r-----. 1 oracle oinstall  52429312 Apr 13 19:05 redo01.log
-rw-r-----. 1 oracle oinstall  52429312 Apr 13 19:04 redo02.log
-rw-r-----. 1 oracle oinstall  52429312 Apr 13 19:04 redo03.log

The database recreates all required redo log files when opens with resetlogs.

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