ORA-10564: Tablespace UNDOTBS1 – Complete Oracle Undo Corruption Recovery Guide The ORA-10564 error is a serious Oracle Database corruption and recovery issue commonly associated with corrupted undo blocks, damaged undo tablespaces, or media recovery failures. This error frequently appears together with: ORA-01110 ORA-10561 ORA-00600 ORA-01578 ORA-00376 In many production environments, ORA-10564 occurs when Oracle attempts to access corrupted undo segments during database startup, transaction recovery, RMAN recovery, or rollback operations. Undo corruption is one of the most dangerous Oracle issues because undo data is essential for: Transaction rollback Read consistency Crash recovery Flashback operations Instance recovery In this complete Oracle DBA recovery guide, you will learn: What ORA-10564 means How undo corruption occurs How to identify corrupted undo segments How to recover damaged undo tablespaces How to create a new UNDO tablespace Step-by...

EBS R12 Web Application Services adoacorectl.sh failed Applies to:             Oracle Enterprise Linux – Version: 7             Oracle EBS R12 Description:             Oracle EBS R12 Application services cannot start successfully adoacorectl.sh going to failed. I have restarted all the services of application and database but the problem is same. I have also restarted the whole machine/server but still the same issue. I found in log file that all OC4J services (oacore, oafm, form) going to fail with timeout error. Solution:             After some research I found that need to clean out the lock files. Following the steps to resolve the above issue: 1-       Stop all application services      ...