Answer
Increasing shared_buffers improves caching but may cause slow checkpoints or reduce OS cache efficiency. A balanced configuration is required.
Quick Answer
shared_buffers is the main PostgreSQL cache for table and index pages. Increasing it reduces disk I/O for frequently accessed data. Recommended starting point: 25% of RAM (OS also caches, so more than 40% has diminishing returns). Too small: constant disk I/O. Too large: leaves insufficient RAM for OS cache and sorts. Monitor buffer hit ratio in pg_statio_user_tables - target >99% hit rate.
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.
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Source: SugharaIQ