This video explores the Write-Ahead Log (WAL), a fundamental concept in database systems. We'll delve into how WAL ensures data durability, how it works with checkpoints and recovery mechanisms, and its crucial role in maintaining data consistency. Whether you're a database enthusiast or just curious about how databases work, this video will provide a clear and concise understanding of Write-Ahead Logging. Before explaining WAL it explains the fundamentals and trade-offs to explain the concept used to design WAL.
Here is what you will learn in this video -
- Understanding the problem - Disk Writes
- Understanding the basics
- How data flows between client ⟶ database
- What are the storage options and understanding the trade-off
- Pages and Extents
- Problems and possible solutions from first principle & trade-offs
- Understanding the requirement
- Crash Recovery
- Undo
- Redo
- Optimize Disk I/O
- Batching
- Cache Pages
- Async Writes
- Atomicity
- Concurrency Control
- Database policies
- Steal / No-Steal
- Force / No-Force
- Write Ahead Logging
- Explanation
- Log Structure
- Checkpoint
- Point in time recovery
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