Oracle 10053 Optimizer Trace: Seeing Inside the Cost-Based Optimizer : Introduction : Every time Oracle performs a hard parse of a SQL statement, the Cost-Based Optimizer (CBO) goes through a …

Oracle SQL Monitor : Real Time Execution Plan Monitoring : Introduction : SQL Monitor is a diagnostics tool that tracks long-running SQL statements while they are still executing. It does …

Oracle AWR Compare Periods Report : Diagnosing Database Performance Degradation   Introduction : AWR Compare Periods Report (officially “AWR Compare Periods”) is part of Oracle’s Diagnostics Pack. Its purpose is …

Oracle SQL Performance Analyzer (SPA) : Predicting the Impact of Changes on SQL Workloads Introduction As a DBA, you often face a decision: the database needs to be upgraded, an …

Introduction : A deadlock is a situation in which two or more sessions are waiting for each other to release locks, creating a circular dependency. Unlike simple blocking, where one …

Introduction : When you manage an Oracle database in production, performance problems are inevitable. A query suddenly slows down, users start complaining, and you need to figure out what went …

Introduction – Oracle Database Blocking Sessions In Oracle Database, blocking occurs when one session holds a lock on a resource (typically a row or table) and another session attempts to …

Oracle Flashback Database : A Practical Recovery Demonstration Introduction Oracle Flashback Database is a database recovery feature that allows a database to be rewound to an earlier point in time. …