{"Entry":{"collection":"metric","key":"pg_stat_recovery_prefetch-prefetch","name":"pg_stat_recovery_prefetch.prefetch","aliases":["prefetch","pg_stat_recovery_prefetch"],"metadata":{"aliases":["prefetch","pg_stat_recovery_prefetch"],"category":"pg_stat_recovery_prefetch","content_hash":"4fc215742e542622a8cb76d4b732c7b08b4a82506a8ac2240ab1ed0210cec615","imported_at":"2026-09-30T00:40:46.03857+08:00","name":"pg_stat_recovery_prefetch.prefetch","name_zh":"","slug":"pg_stat_recovery_prefetch-prefetch","summary":"Number of blocks prefetched because they were not in the buffer pool"}},"Definition":{"Collection":"metric","Key":"pg_stat_recovery_prefetch-prefetch","SourceDatabase":"center","Version":"18","SourceTable":"statistics_metric","SourceKey":"pg_stat_recovery_prefetch-prefetch","SourceRevision":"555610c24d53e4316da5b7d3fc25c279d96856d5e0e23ee308c328c5fa881d9f","Facts":{"comparison_data":{"field":"prefetch","sql_type":"bigint","units_mentioned":["blocks"],"view":"pg_stat_recovery_prefetch"},"comparison_hash":"d343259225970f8a295315ed24ac64bd06fcd728014758b1600eb570ad68751a","description":["Number of blocks prefetched because they were not in the buffer pool"],"documented":true,"facts":[{"label":"View","value":"pg_stat_recovery_prefetch"},{"label":"Field","value":"prefetch"},{"label":"SQL type","value":"bigint"},{"label":"Units named in the field definition","value":"blocks"},{"label":"Reset observation","value":"Time at which these statistics were last reset"}],"field":"prefetch","manual_html":"","manual_path":"/docs/18/monitoring-stats.html","related":[{"label":"pg_stat_recovery_prefetch columns","url":"/wiki/catalog/pg_stat_recovery_prefetch/?v=18"},{"label":"Statistics collection and reset functions","url":"/docs/18/monitoring-stats.html"}],"release":{"channel":"stable","label":"18.6","major":"18","ref":"https://ftp.postgresql.org/pub/source/v18.6/postgresql-18.6.tar.bz2","revision":"555610c24d53e4316da5b7d3fc25c279d96856d5e0e23ee308c328c5fa881d9f"},"sections":[{"paragraphs":["The pg_stat_recovery_prefetch view will contain only one row. The columns wal_distance, block_distance and io_depth show current values, and the other columns show cumulative counters that can be reset with the pg_stat_reset_shared function."],"title":"View semantics"},{"paragraphs":["The pg_stat_recovery_prefetch view will contain only one row. The columns wal_distance , block_distance and io_depth show current values, and the other columns show cumulative counters that can be reset with the pg_stat_reset_shared function."],"title":"Collection and reset context"},{"code":"SELECT prefetch FROM pg_catalog.pg_stat_recovery_prefetch;","paragraphs":["Example query; no execution result or measured value is asserted."],"title":"Inspect this field"}],"signature":"SELECT prefetch FROM pg_catalog.pg_stat_recovery_prefetch;","source_only":false,"sources":[{"label":"PostgreSQL 18 English manual","path":"monitoring-stats.html","sha256":"aa979eed08627fbf715a9d792094a162a73671db5af810f3ab2aad3e073d5722","url":"/docs/18/monitoring-stats.html#PG-STAT-RECOVERY-PREFETCH-VIEW"}],"sql_type":"bigint","tables":[],"units_mentioned":["blocks"],"view":"pg_stat_recovery_prefetch"},"ManualEvidence":{"manual_path":"/docs/18/monitoring-stats.html","release":{"channel":"stable","label":"18.6","major":"18","ref":"https://ftp.postgresql.org/pub/source/v18.6/postgresql-18.6.tar.bz2","revision":"555610c24d53e4316da5b7d3fc25c279d96856d5e0e23ee308c328c5fa881d9f"},"sources":[{"label":"PostgreSQL 18 English manual","path":"monitoring-stats.html","sha256":"aa979eed08627fbf715a9d792094a162a73671db5af810f3ab2aad3e073d5722","url":"/docs/18/monitoring-stats.html#PG-STAT-RECOVERY-PREFETCH-VIEW"}]},"MeasuredEvidence":{}},"Text":{"Collection":"metric","Key":"pg_stat_recovery_prefetch-prefetch","SourceDatabase":"center","Version":"18","Locale":"en","Title":"pg_stat_recovery_prefetch.prefetch","Summary":"Number of blocks prefetched because they were not in the buffer pool","BodyHTML":"\u003cp\u003eNumber of blocks prefetched because they were not in the buffer pool\u003c/p\u003e","SourceRevision":"555610c24d53e4316da5b7d3fc25c279d96856d5e0e23ee308c328c5fa881d9f","ContentHash":"87abd50d224eed20ec4f48e0825b7538cbf0064a693040d1eed8df658c5867f6","Payload":{"description":["Number of blocks prefetched because they were not in the buffer pool"],"manual_html":"","related":[{"label":"pg_stat_recovery_prefetch columns","url":"/wiki/catalog/pg_stat_recovery_prefetch/?v=18"},{"label":"Statistics collection and reset functions","url":"/docs/18/monitoring-stats.html"}],"sections":[{"paragraphs":["The pg_stat_recovery_prefetch view will contain only one row. The columns wal_distance, block_distance and io_depth show current values, and the other columns show cumulative counters that can be reset with the pg_stat_reset_shared function."],"title":"View semantics"},{"paragraphs":["The pg_stat_recovery_prefetch view will contain only one row. The columns wal_distance , block_distance and io_depth show current values, and the other columns show cumulative counters that can be reset with the pg_stat_reset_shared function."],"title":"Collection and reset context"},{"code":"SELECT prefetch FROM pg_catalog.pg_stat_recovery_prefetch;","paragraphs":["Example query; no execution result or measured value is asserted."],"title":"Inspect this field"}],"tables":[]}},"RequestedLocale":"zh-Hans","Fallback":true,"Versions":["15","16","17","18","19","20"],"Locales":["en"],"Signatures":null,"Spellings":null,"SQLState":null,"Evidence":null}