The Backend Engineering Show with Hussein Nasser
Database Torn pages
Feb 29, 2024
Exploring torn pages in databases, including Oracle and MySQL solutions. Comparison of file system block and database pages. Postgres full page writes.
15:33
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Quick takeaways
- File systems use fixed-size blocks while databases manage fixed-size pages, causing torn page issues.
- Strategies like double write buffers and full page writes prevent data loss and ensure data integrity.
Deep dives
Database System Challenges and Resolution
Database systems encounter challenges due to fixed-size pages and file system limitations. The concept of page abstraction in databases simplifies data handling but interacts with OS file systems that have fixed block sizes. This mismatch can lead to torn page issues where data gets partially written, increasing the risk of corruption. Solutions like recovery managers in Oracle, double write buffers in MySQL, and full page writes in Postgres address torn page problems by maintaining backup copies and ensuring data integrity.
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