buffer_hit

Buffer cache hits

Dimensions:None

Available on:

Datadog

postgresql.buffer_hit

The number of times disk blocks were found in the buffer cache, preventing the need to read from the database. This metric is tagged with db.

Dimensions:None

Sources

Technical Annotations (9)

Configuration Parameters (1)

shared_buffers

size of PostgreSQL buffer cache in memory

CLI Commands (2)

ALTER SYSTEM SET shared_buffers = '16GB';remediation

SELECT pg_reload_conf();remediation

Technical References (6)

shared_bufferscomponentOS Page CachecomponentCache Hit Ratioconceptbuffer cachecomponentDjango Debug Toolbarcomponentcache panelcomponent

Cache hit ratio below optimal causes excessive disk I/Owarning

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Cache hit ratio below 99% indicates undersized shared_buffers or high disk I/Owarning

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Buffer cache hit ratio below 95% causes excessive disk I/Owarning

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Low cache hit ratio indicates ineffective cache configurationinfo

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