Postgres FM
Index maintenance
Sep 23, 2022
The podcast discusses the importance of index maintenance in PostgreSQL databases, exploring bloat analysis, redundant indexes, and the relationship between index usage and bloat. The hosts emphasize the negative impact of not using indexes, caution against certain tools due to potential bugs, and highlight the use of vacuum in parallel and the importance of partitioning for efficient database maintenance.
32:41
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Quick takeaways
- Regular index maintenance is necessary to maintain database performance and reduce bloat, even with aggressive vacuuming.
- Estimation scripts for analyzing index bloat should be regarded as estimates, and tools like PG_SAT_TUPLE or vacuum full on a clone database provide accurate measurements.
Deep dives
Importance of Index Maintenance
Regular index maintenance is crucial for maintaining database performance and reducing bloat. While auto vacuum helps to some extent, it won't completely eliminate the need for manual index maintenance. Even with aggressive vacuuming, some bloat will still accumulate, especially in heavily loaded systems. Observing other database systems like SQL Server, it becomes clear that index maintenance is essential. Therefore, periodically recreating indexes is necessary, as it not only reduces the frequency of bloat accumulation but also helps improve system performance.
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