Oracle Database Error Solutions & DBA Guide

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....

Forms Server Not Starting Up – Forms Listener Servlet Connection Error (Complete Oracle Forms & Oracle E-Business Suite Troubleshooting Guide) 📅 Last Updated: August 2026 This guide has been completely updated for Oracle Forms 11g, Oracle Forms 12c, Oracle E-Business Suite R12.1 and R12.2 running on Oracle Database 11g, 12c, 19c, 21c, and Oracle Database 23ai. It covers Forms Listener Servlet connection errors, Forms Managed Server startup failures, WebLogic troubleshooting, AutoConfig validation, log analysis, and production-ready Oracle Apps DBA troubleshooting procedures. One of the most common Oracle Forms issues encountered by Oracle Apps DBAs is the failure of the Forms Server to start successfully. Users may receive a Forms Listener Servlet connection error , encounter a blank page, or experience application startup failures while launching Oracle Forms from Oracle E-Business Suite. Although the error often appears to be related only to Oracle Forms, t...

Oracle EBS Cloning with File System Synchronization (Complete Oracle Apps DBA Guide) 📅 Last Updated: August 2026 This guide has been completely updated for Oracle E-Business Suite R12.1 and R12.2 running on Oracle Database 11g, 12c, 19c, 21c, and Oracle Database 23ai. It explains Oracle Rapid Clone, file system synchronization, Oracle EBS dual file system architecture (fs1/fs2), AutoConfig, WebLogic considerations, post-clone validation, and production best practices for Oracle Apps DBAs. Oracle E-Business Suite cloning is one of the most common administrative tasks performed by Oracle Apps DBAs. Organizations regularly clone production environments to development, testing, quality assurance, disaster recovery, and training systems. Although Oracle Rapid Clone automates most of the cloning process, a successful clone involves much more than copying database files and application binaries. Oracle EBS administrators must ensure that configuration files, context fil...

FNDCPASS – Change SYSADMIN and APPS Passwords in Oracle E-Business Suite (Complete Oracle Apps DBA Guide) 📅 Last Updated: August 2026 This guide has been completely updated for Oracle E-Business Suite R12.1 and R12.2 running on Oracle Database 11g, 12c, 19c, 21c, and Oracle Database 23ai. It covers the legacy FNDCPASS utility, Oracle's recommended AFPASSWD utility, APPS/APPLSYS password synchronization, SYSADMIN password management, AutoConfig, WebLogic considerations, security best practices, and production troubleshooting. Managing passwords securely is one of the most important responsibilities of an Oracle E-Business Suite (EBS) Applications DBA. Password changes are required during system hardening, security audits, user administration, cloning activities, password expiration, and compliance with organizational security policies. Oracle E-Business Suite provides the FNDCPASS utility for changing passwords of application users, the APPS/APPLSYS account...