Answer
PostgreSQL flushes WAL buffers using wal_writer and synchronous_commit settings. Extreme durability requires synchronous_commit=on, full_page_writes=on, fast NVMe storage, tuned WAL-segmentation, and aggressive archiving.
Quick Answer
WAL durability tuning: synchronous_commit=on ensures WAL flushed to disk before commit. wal_sync_method: fdatasync (default Linux), fsync, open_sync. Use hardware with battery-backed write cache for better performance without compromising durability. synchronous_standby_names with remote_apply ensures WAL applied on standby before commit. For extreme durability: synchronous replication + local journal sync = RPO of effectively 0.
S
SugharaIQ Editorial Team
Verified Answer
This answer has been peer-reviewed by industry experts holding senior engineering roles to ensure technical accuracy and relevance for modern interview standards.
Want to bookmark, take notes, or join discussions?
Sign in to access all features and personalize your learning experience.
Source: SugharaIQ