How to Check TEMP Usage in Oracle Database
Temporary tablespace management is a critical aspect of Oracle Database administration. When TEMP tablespace fills up, it can cause queries to fail, sessions to…
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323 articles
Can You Delete a Primary Key in SQL?
Short answer: Yes, absolutely. Surprising answer: Most developers don’t know this is even possible. Here’s the thing—primary keys feel permanent. You set them when…
5 SQL Primary Key Mistakes That Kill Database Performance (+ Fixes)
You’re building a user registration system. Everything works fine with 100 users. Then you hit 10,000 users and your database grinds to a halt.…
Understanding and Resolving ORA-30012: A Comprehensive Guide to UNDO Tablespace Issues
Introduction The ORA-30012 error, which indicates “undo tablespace does not exist or is of wrong type,” is one of the most frequently encountered yet…
How to Create and Configure ASM Disk Groups on Oracle Exadata Database Machine
Oracle Automatic Storage Management (ASM) serves as the foundational storage management layer for Oracle Exadata environments. By organizing grid disks into logical disk groups,…
Oracle Database Patching – Complete Interview Preparation Guide
Quick Summary Oracle database patching is a critical DBA responsibility involving applying updates to fix bugs, security vulnerabilities, and add new features.This guide covers…
Oracle Data Guard Interview Questions – Complete DBA Guide
Quick Summary Oracle Data Guard is Oracle’s disaster recovery (DR) and high availability (HA) solution that maintains one or more standby databases as synchronized…
Oracle Database Architecture Interview Questions – Complete DBA Guide
Introduction Preparing for an Oracle DBA interview?Interviewers often focus on database architecture fundamentals and real production scenarios rather than just textbook definitions. This comprehensive…
How to Monitor System Load Average Periodically in Linux
Monitoring system performance is a critical task for system administrators and developers. While the top command provides comprehensive resource information, sometimes you need a…
How to Multiplex Control Files in Oracle Database (Linux & Windows)
What Is Control File Multiplexing in Oracle? Control file multiplexing in Oracle is the process of maintaining multiple synchronized copies of the control file…
Resolving Invalid DBMS_AUDIT_UTIL Package in Oracle Database
Overview The DBMS_AUDIT_UTIL package plays a key role in Oracle Database by managing audit operations. However, when this package becomes invalid, it can affect…
How to Enable Trace 10053 for a SQL Query in Oracle
Oracle execution plans often show what plan was chosen, but not why.When a query performs poorly and the plan looks correct, trace 10053 helps…