{"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","derived_content_hash":"093656d1cfc72b30999ccaddd43285a63ea396e19017c156f39a1520ee4e4c29","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"],"description_zh":"因不在缓冲池中而预取的块数","description_zh_html":"\u003cp\u003epg_stat_recovery_prefetch.prefetch 统计字段。\u003c/p\u003e\u003cdl\u003e\u003cdt\u003e视图\u003c/dt\u003e\u003cdd\u003e\u003ccode\u003epg_stat_recovery_prefetch\u003c/code\u003e\u003c/dd\u003e\u003cdt\u003e字段\u003c/dt\u003e\u003cdd\u003e\u003ccode\u003eprefetch\u003c/code\u003e\u003c/dd\u003e\u003cdt\u003eSQL 类型\u003c/dt\u003e\u003cdd\u003e\u003ccode\u003ebigint\u003c/code\u003e\u003c/dd\u003e\u003c/dl\u003e\u003ch3\u003e同版本中文手册定义\u003c/h3\u003e\u003cp\u003e因不在缓冲池中而预取的块数\u003c/p\u003e\u003cp\u003e\u003ca href=\"/zh/docs/18/monitoring-stats.html#\"\u003e查看完整中文手册与上下文\u003c/a\u003e。\u003c/p\u003e","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"}],"facts_zh":[{"label":"视图","value":"pg_stat_recovery_prefetch"},{"label":"字段","value":"prefetch"},{"label":"SQL 类型","value":"bigint"},{"label":"字段定义记载的单位","value":"blocks"},{"label":"重置条件","value":"这些统计上次重置的时间"}],"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"}],"sections_zh":[{"paragraphs":["pg_stat_recovery_prefetch 视图仅包含一行。wal_distance、block_distance 和 io_depth 列显示当前值，其他列为累计计数器，可通过 pg_stat_reset_shared 函数重置。"],"title":"视图语义"},{"paragraphs":["pg_stat_recovery_prefetch 视图将只包含一行。 wal_distance 、 block_distance 和 io_depth 列显示当前值，其他列显示可以使用 pg_stat_reset_shared 函数重置的累积计数器。"],"title":"采集与重置语义"},{"code":"SELECT prefetch FROM pg_catalog.pg_stat_recovery_prefetch;","paragraphs":["示例查询；不表示已执行，也不提供实测值。"],"title":"查看此字段"}],"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":[],"tables_zh":[],"units_mentioned":["blocks"],"view":"pg_stat_recovery_prefetch","zh_from":{"authored_translation":"source-derived-structured-summary","body_sha256":"14e06fabaaff02ccb627aba1437002abfd0f52d2144aef6adc1031054f61b8c1","kind":"same-version-chinese-manual-with-source-derived-structured-summary","manual":{"anchor":"","build_id":107,"column":"prefetch","extraction":"exact-catalog-field","locale":"zh-Hans","page_key":"monitoring-stats.html","source_hash":"0274aac7991450316bcf7be44635653b6d896fb00e321242c1b6674cb05c2e53","source_revision":"unknown:rendered-translation-baseline","translation_revision":"git:b1b500221dbe5437cfca004d6b04d3f6e422765d;html-sha256:08e987a66af27b98444a8057c256314eafa13611a3fb9e888214fc436824244b","url":"/zh/docs/18/monitoring-stats.html#","version":"18"},"runtime_rerun":false,"source_facts_revision":"555610c24d53e4316da5b7d3fc25c279d96856d5e0e23ee308c328c5fa881d9f"}},"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":"en","Fallback":false,"Versions":["15","16","17","18","19","20"],"Locales":["en","zh-Hans"],"Signatures":null,"Spellings":null,"SQLState":null,"Evidence":null}