Introduction Oracle Application Express (APEX) is one of the most widely adopted low-code development platforms in the Oracle ecosystem. As organizations scale their APEX deployments, the need for robust monitoring and troubleshooting capabilities becomes critical. This article provides SQL queries that DBAs and developers can use to monitor, diagnose, and optimize their APEX environments. What makes monitoring APEX unique is the three-tier architecture it operates on: the Oracle Database at the data layer, APEX at the application layer, and Oracle REST Data Services (ORDS) as the middleware. Understanding how sessions flow through these three layers is the key to effective monitoring. Architecture Overview Layer Component Version Role Database Oracle DB 19.28 Stores data, executes SQL, manages sessions Application Oracle AP...
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