With the widespread adoption of Oracle Multitenant Architecture in enterprise environments, understanding how Data Guard operates with Container Databases (CDBs) and Pluggable Databases (PDBs) is critical. Oracle 19c, being a Long-Term Support (LTS) release, offers mature support for CDB-based Data Guard configurations. However, DBAs and architects must factor in specific considerations to ensure a robust, […]
When a specific query in Oracle runs unusually slow, systematic diagnostics can help identify the root cause. Below is a step-by-step methodology to troubleshoot and optimize the query effectively. 1. Check the Execution Plan (Explain Plan) Use EXPLAIN PLAN FOR or DBMS_XPLAN.DISPLAY_CURSOR to examine how Oracle is executing the query. EXPLAIN PLAN FOR<your-query>;SELECT * FROM […]
When an application team approaches you with a complaint of performance degradation on an Oracle Database, a structured and methodical troubleshooting approach is paramount. Below is a strategic, end-to-end diagnostic framework to identify and remediate the root cause: Step 1: Preliminary Assessment – Framing the Problem Before diving into deep diagnostics, it’s imperative to clearly […]
When a database is originally created with the Global Database Name <database>, its db_name and db_unique_name are the same. The CRS (Cluster Ready Services) database resource is named as ora.<database>.db. Changing the db_unique_name involves a complete database restart and requires careful coordination of steps. Step 1: Remove the Database, Instance, and Service Resources from CRS […]