Oracle Database Error Solutions & DBA Guide

Unable to Start Oracle HTTP Server (OHS): Error While Loading Shared Libraries libdb.so.2 (Complete Oracle EBS Troubleshooting Guide) 📅 Last Updated: August 2026 This guide has been fully updated for Oracle E-Business Suite R12.1.x, R12.2.x, Oracle HTTP Server (OHS), Oracle Fusion Middleware 11g/12c, Oracle Linux, Red Hat Enterprise Linux (RHEL), and CentOS. It explains how to diagnose and resolve Oracle HTTP Server startup failures caused by the missing libdb.so.2 shared library using Oracle and Linux administration best practices. Oracle HTTP Server (OHS) is one of the most important components of the Oracle E-Business Suite application tier. Every user request from a web browser passes through Oracle HTTP Server before reaching Oracle WebLogic Server and the EBS application services. If Oracle HTTP Server cannot start because a required shared library such as libdb.so.2 is missing, the entire Oracle EBS web application becomes unavailable. Users cannot acces...

How to Reset or Change the SYS User Password in Oracle Database (Complete DBA Guide) 📅 Last Updated: August 2026 This guide has been fully updated for Oracle Database 11g, 12c, 18c, 19c, 21c, and Oracle Database 23ai. It explains how to safely reset or change the SYS user password using Oracle-supported methods, understand password file authentication, verify Oracle security settings, and troubleshoot common SYSDBA authentication issues in production environments. The SYS account is the most privileged administrative account in Oracle Database. It owns the Oracle data dictionary and is responsible for managing internal database objects, startup and shutdown operations, recovery, upgrades, and many critical administrative tasks. Because of its elevated privileges, changing the SYS password requires careful planning. Oracle provides multiple supported methods depending on the database configuration, authentication mode, and whether the database uses a password fi...

How to Change the Default Port of Oracle Database Listener (Complete Oracle Net Services Guide) 📅 Last Updated: August 2026 This guide has been completely updated for Oracle Database 11g, 12c, 18c, 19c, 21c, and Oracle Database 23ai. It explains how to safely change the default Oracle Listener port, update Oracle Net Services configuration files, verify database registration, troubleshoot connectivity issues, and validate client connections using Oracle Database administration best practices. The Oracle Listener is one of the most critical components of Oracle Net Services. Every remote client connection to an Oracle Database passes through the Listener before a database session is established. By default, Oracle configures the Listener to listen on TCP port 1521 , which has become the industry-standard Oracle Database port. Although port 1521 works well for most installations, database administrators may need to change it due to security policies, firewall requi...

ORA-39213: Metadata Processing is not Available – Complete Oracle Data Pump Troubleshooting Guide 📅 Last Updated: August 2026 This guide has been completely updated for Oracle Database 11g, 12c, 18c, 19c, 21c, and Oracle Database 23ai. It explains how to diagnose and resolve ORA-39213: Metadata Processing is not Available , understand the Oracle Data Pump Metadata API, reload XSL stylesheets, validate database components, and restore Data Pump functionality using Oracle Database administration best practices. Oracle Data Pump is the recommended utility for high-speed logical backup, migration, upgrade, and data movement in Oracle Database environments. Database administrators rely on EXPDP and IMPDP to export and import schemas, tablespaces, databases, transportable tablespaces, and metadata. One of the less common but critical Data Pump errors is ORA-39213: Metadata Processing is not Available . This error indicates that Oracle Data Pump cannot access the Meta...

APPS Login Failed with Error HTTP 404 in Oracle E-Business Suite R12 (Complete Troubleshooting Guide) 📅 Last Updated: August 2026 This guide has been completely updated for Oracle E-Business Suite Release 12.1 and 12.2. It explains how to troubleshoot the HTTP 404 error during Oracle EBS login , understand the underlying Oracle Application Server architecture, identify incorrect file ownership issues, review application logs, and restore application availability using Oracle Applications DBA best practices. Oracle E-Business Suite (EBS) is one of the world's most widely deployed enterprise ERP systems. Thousands of organizations rely on Oracle EBS every day to manage Finance, Supply Chain, Procurement, Human Resources, Manufacturing, Projects, and numerous other mission-critical business processes. One of the more frustrating issues Oracle Applications DBAs encounter is when users successfully reach the Oracle EBS login page, enter valid credentials, and then...