Oracle Database Error Solutions & DBA Guide

REP-0501 ORA-01017: Unable to Connect to the Specified Database – Complete Oracle Reports Troubleshooting Guide 📅 Last Updated: August 2026 This guide has been completely updated for Oracle Reports 6i, Oracle Reports 10g, Oracle Reports 11g, Oracle Database 10g, 11g, 12c, 18c, 19c, 21c, and Oracle Database 23ai. It covers REP-0501, ORA-01017 authentication failures, Oracle Reports architecture, Linux migration issues, password case sensitivity, production troubleshooting, and Oracle DBA best practices. The error REP-0501: Unable to connect to the specified database is one of the most common Oracle Reports errors encountered during report execution, application upgrades, database migrations, password changes, and Oracle Database upgrades. In most cases, REP-0501 is accompanied by the Oracle Database error ORA-01017: invalid username/password; logon denied , indicating that Oracle Reports could not authenticate successfully with the target Oracle Database. Al...

Auto Startup and Shutdown of Oracle Database in Linux – Complete Oracle DBA Guide 📅 Last Updated: August 2026 This guide has been completely updated for Oracle Database 11g, 12c, 18c, 19c, 21c, and 23ai running on Oracle Linux, Red Hat Enterprise Linux (RHEL), Rocky Linux, AlmaLinux, CentOS, Ubuntu, and other Linux distributions. It covers traditional dbstart/dbshut , /etc/oratab , modern systemd service configuration, production troubleshooting, and Oracle DBA best practices. Oracle databases host mission-critical business applications and are expected to become available automatically after planned maintenance, server reboots, or unexpected operating system restarts. Without automatic startup and shutdown, database administrators must manually start the Oracle Listener, Oracle Database, and related services after every reboot. This increases recovery time, delays application availability, and raises the risk of operational errors. Oracle provides the dbst...