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...

Web Application Services adoacorectl.sh Failed (Complete Oracle E-Business Suite R12.1 Troubleshooting Guide) 📅 Last Updated: August 2026 This guide has been completely updated for Oracle E-Business Suite R12.1 environments running on Oracle Database 11g, 12c, 19c, and Oracle Linux. It explains adoacorectl.sh startup failures, OC4J architecture, OPMN services, persistence lock file issues, AutoConfig validation, production troubleshooting, and Oracle Apps DBA best practices. Important Note This article applies to Oracle E-Business Suite R12.1 , which uses the Oracle Containers for Java (OC4J) application server architecture. Oracle E-Business Suite R12.2 uses Oracle WebLogic Server , where adoacorectl.sh is no longer used for middleware service management. One of the common middleware issues encountered by Oracle Apps DBAs in Oracle E-Business Suite R12.1 is the failure of the oacore , oafm , or forms services to start using the adoacorectl.sh utility....