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dev.test-vacuum-freq Calculator
Calculates optimal PostgreSQL autovacuum frequency from table update rate, dead tuple threshold, and performance impact in a software testing and quality assurance context. Postgres MVCC never overwrites rows in-place — dead tuples accumulate until vacuumed, and above 20% dead tuples, query performance degrades noticeably.
Inputs
Tps
Reference formula or conversion factor shown for context.
Dead Pct
Reference formula or conversion factor shown for context.
Rows
Reference formula or conversion factor shown for context.
Results
dead tuples/s
Rate of dead (logically deleted) rows accumulating in PostgreSQL. High rates require frequent VACUUM runs to prevent table bloat.
vacuum threshold
Reference formula or conversion factor shown for context.
vacuum interval
Sample size or count used in the calculation.
vacuums/day
Number of VACUUM operations run per day. Too few allows bloat; too many wastes I/O. Auto-vacuum should handle most cases automatically.