write-ahead logging (WAL)
Persist the recovery log before the corresponding data pages.
Use this when A database must recover committed changes after a crash without flushing every changed page at commit.
without the term
“Explain how committed database changes survive a crash before the changed data pages are saved.”
with the term · How do you ask a model for write-ahead logging (WAL)?
Check WAL durability settings. Verify crash recovery against the writes that were acknowledged before the crash.
What is write-ahead logging (WAL)?
WAL records changes before the affected data pages are written. Durable log records allow recovery to redo changes; the configured flush and acknowledgement policy determines what survives a failure.
Why does write-ahead logging (WAL) matter when vibe coding?
An agent can disable durable flushing for speed and still claim committed writes survive a crash.
How do you do write-ahead logging (WAL)?
Inspect log flush and commit settings. Run a crash-recovery drill on a disposable instance and reconcile acknowledged commits with recovered data.
What goes wrong with write-ahead logging (WAL)?
WAL is not a standalone backup. Losing required log segments or the underlying durable storage can prevent recovery.
Sources for this entry
- PostgreSQL: Write-ahead logging
Log records reach durable storage before the corresponding data changes; redo supports crash recovery.
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