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Disk I/O Semantics: O_DIRECT, fsync, and Page Cache

Learning Objectives

•OS page cache buffering behavior
•fsync vs fdatasync durability guarantees
•O_DIRECT bypassing page cache

Weekly Outcome

Master the core concepts of write-ahead logging (wal) & crash recovery.

Resources

PostgreSQL: Documentation: 18: 28.3. Write-Ahead Logging (WAL)SQLite WAL: Write-Ahead Logging Explained - SQL Docs Write Ahead Logs : But Why ??. Write-Ahead Logging (WAL) is...