No Redo Logs = Data Loss | Oracle DBA Must Know This

Описание: Redo log files are the backbone of Oracle Database recovery — and if you don’t understand them, you cannot call yourself an Oracle DBA.

In Day 7 of the 100-Day Oracle DBA Challenge, we break down Redo Log Files in Oracle in a clear, beginner-friendly way while explaining the internal behavior every professional DBA must understand.

In this video, you will learn:

What redo log files are and why Oracle depends on them

How Oracle guarantees durability using the redo buffer and redo logs

The difference between online redo logs and archived redo logs

How redo log groups and redo log members work

The role of LGWR and ARCn background processes

What happens during redo log switching

Best practices for redo log sizing and multiplexing

How redo logs protect committed transactions during crashes

Redo logs record every database change — inserts, updates, deletes, and structural operations. Oracle uses them to recover committed transactions during instance failure, system crashes, and media failures. Without properly configured redo logs, recovery becomes impossible.

This lesson is essential if you are:

Learning Oracle Database from scratch

Preparing for an Oracle DBA role or certification

Transitioning from MySQL, SQL Server, or PostgreSQL

Improving your backup, recovery, and performance tuning skills

Redo logs are often called the heartbeat of Oracle recovery. If they are sized, multiplexed, and monitored correctly, your database survives failures. If they are ignored, data loss becomes a real risk.

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Day 7 Topic: Oracle Redo Log Files Explained
Series: 100-Day Oracle DBA Challenge
Level: Beginner to Intermediate Oracle DBA