Oracle SQL Tuning Tips for Beginners

 Introduction

SQL tuning improves query performance and reduces load on your database. Here are simple tips for beginners.

Tips:

1. Use EXPLAIN PLAN

EXPLAIN PLAN FOR SELECT * FROM employees WHERE department_id=10;

SELECT * FROM TABLE(DBMS_XPLAN.DISPLAY);

2. **Avoid SELECT ***

Only fetch required columns.

3. Use Indexes

Create indexes on columns used in WHERE clauses.

4. Use Bind Variables

Prevents hard parsing and improves performance.

5. Monitor with AWR Reports

@$ORACLE_HOME/rdbms/admin/awrrpt.sql

Conclusion

Following these tips helps beginners write efficient SQL queries and improve database performance.