Write-Ahead Logging ·
Log first, then data
un
seel
.com · LSN · fsync · redo / undo
Log records
0
Pages flushed
0
State
—
Dirty page (memory)
Log record (WAL)
Durable on disk
Crash / lost
▶ Play
←
→
🔇 Unmute
Reset
Un
seel
.com · Write-Ahead Logging