{"Entry":{"collection":"metric","key":"pg_stat_io-writebacks","name":"pg_stat_io.writebacks","aliases":["writebacks","pg_stat_io"],"metadata":{"aliases":["writebacks","pg_stat_io"],"category":"pg_stat_io","content_hash":"cb565ff8836dc74331397f5638206508a1413ac158a962f3b62255c2c4cc5c44","derived_content_hash":"3bde04d2e5cf240ad44bb388cdc42f4d10e43bc5b77fa77c4085647107c72264","imported_at":"2026-09-30T00:40:45.707831+08:00","name":"pg_stat_io.writebacks","name_zh":"","slug":"pg_stat_io-writebacks","summary":"Number of units of size BLCKSZ (typically 8kB) which the process requested the kernel write out to permanent storage."}},"Definition":{"Collection":"metric","Key":"pg_stat_io-writebacks","SourceDatabase":"center","Version":"18","SourceTable":"statistics_metric","SourceKey":"pg_stat_io-writebacks","SourceRevision":"555610c24d53e4316da5b7d3fc25c279d96856d5e0e23ee308c328c5fa881d9f","Facts":{"comparison_data":{"field":"writebacks","sql_type":"bigint","units_mentioned":[],"view":"pg_stat_io"},"comparison_hash":"63a9965c58806f6cf5a6c041f7ea9cc859b807e7094e0cbf2fc089c3fca10dc7","description":["Number of units of size BLCKSZ (typically 8kB) which the process requested the kernel write out to permanent storage."],"description_zh":"进程请求内核写出到永久存储的、大小为 BLCKSZ（通常为 8kB）的单位数量。","description_zh_html":"\u003cp\u003epg_stat_io.writebacks 统计字段。\u003c/p\u003e\u003cdl\u003e\u003cdt\u003e视图\u003c/dt\u003e\u003cdd\u003e\u003ccode\u003epg_stat_io\u003c/code\u003e\u003c/dd\u003e\u003cdt\u003e字段\u003c/dt\u003e\u003cdd\u003e\u003ccode\u003ewritebacks\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进程请求内核写出到永久存储的、大小为 BLCKSZ（通常为 8kB）的单位数量。\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_io"},{"label":"Field","value":"writebacks"},{"label":"SQL type","value":"bigint"},{"label":"Units named in the field definition","value":"Not specified"},{"label":"Reset observation","value":"Time at which these statistics were last reset."}],"facts_zh":[{"label":"视图","value":"pg_stat_io"},{"label":"字段","value":"writebacks"},{"label":"SQL 类型","value":"bigint"},{"label":"字段定义记载的单位","value":"未指定"},{"label":"重置条件","value":"这些统计信息上次被重置的时间。"}],"field":"writebacks","manual_html":"","manual_path":"/docs/18/monitoring-stats.html","related":[{"label":"pg_stat_io columns","url":"/wiki/catalog/pg_stat_io/?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_io view will contain one row for each combination of backend type, target I/O object, and I/O context, showing cluster-wide I/O statistics. Combinations which do not make sense are omitted.\n\nCurrently, I/O on relations (e.g. tables, indexes) and WAL activity are tracked. However, relation I/O which bypasses shared buffers (e.g. when moving a table from one tablespace to another) is currently not tracked."],"title":"View semantics"},{"paragraphs":["Read the same-version statistics collection and view documentation below for reset scope and visibility. No per-field reset rule is inferred from the field name."],"title":"Collection and reset context"},{"code":"SELECT writebacks FROM pg_catalog.pg_stat_io;","paragraphs":["Example query; no execution result or measured value is asserted."],"title":"Inspect this field"}],"sections_zh":[{"paragraphs":["pg_stat_io 视图为后端类型、目标 I/O 对象和 I/O 上下文的每种组合提供一行，显示整个集群的 I/O 统计信息；无意义的组合会省略。目前跟踪关系（如表、索引）的 I/O 和 WAL 活动，但不跟踪绕过共享缓冲区的关系 I/O（例如将表从一个表空间移动到另一个表空间）。"],"title":"视图语义"},{"paragraphs":["重置范围和可见性请参阅下方同版本的统计信息收集与视图文档。不根据字段名称推断各字段的重置规则。"],"title":"采集与重置语义"},{"code":"SELECT writebacks FROM pg_catalog.pg_stat_io;","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 writebacks FROM pg_catalog.pg_stat_io;","source_only":false,"sources":[{"label":"PostgreSQL 18 English manual","path":"monitoring-stats.html","sha256":"aa979eed08627fbf715a9d792094a162a73671db5af810f3ab2aad3e073d5722","url":"/docs/18/monitoring-stats.html#PG-STAT-IO-VIEW"}],"sql_type":"bigint","tables":[],"tables_zh":[],"units_mentioned":[],"view":"pg_stat_io","zh_from":{"authored_translation":"source-derived-structured-summary","body_sha256":"cec7877d4db1eb5feecd25d0b065f4c47d69c697eda5f2b7dd14e5e5a91b33b7","kind":"same-version-chinese-manual-with-source-derived-structured-summary","manual":{"anchor":"","build_id":107,"column":"writebacks","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-IO-VIEW"}]},"MeasuredEvidence":{}},"Text":{"Collection":"metric","Key":"pg_stat_io-writebacks","SourceDatabase":"center","Version":"18","Locale":"en","Title":"pg_stat_io.writebacks","Summary":"Number of units of size BLCKSZ (typically 8kB) which the process requested the kernel write out to permanent storage.","BodyHTML":"\u003cp\u003eNumber of units of size BLCKSZ (typically 8kB) which the process requested the kernel write out to permanent storage.\u003c/p\u003e","SourceRevision":"555610c24d53e4316da5b7d3fc25c279d96856d5e0e23ee308c328c5fa881d9f","ContentHash":"1fdad0216c5d916a559c0ae39033e7237d484da357f64d1562ff71d6a2071c56","Payload":{"description":["Number of units of size BLCKSZ (typically 8kB) which the process requested the kernel write out to permanent storage."],"manual_html":"","related":[{"label":"pg_stat_io columns","url":"/wiki/catalog/pg_stat_io/?v=18"},{"label":"Statistics collection and reset functions","url":"/docs/18/monitoring-stats.html"}],"sections":[{"paragraphs":["The pg_stat_io view will contain one row for each combination of backend type, target I/O object, and I/O context, showing cluster-wide I/O statistics. Combinations which do not make sense are omitted.\n\nCurrently, I/O on relations (e.g. tables, indexes) and WAL activity are tracked. However, relation I/O which bypasses shared buffers (e.g. when moving a table from one tablespace to another) is currently not tracked."],"title":"View semantics"},{"paragraphs":["Read the same-version statistics collection and view documentation below for reset scope and visibility. No per-field reset rule is inferred from the field name."],"title":"Collection and reset context"},{"code":"SELECT writebacks FROM pg_catalog.pg_stat_io;","paragraphs":["Example query; no execution result or measured value is asserted."],"title":"Inspect this field"}],"tables":[]}},"RequestedLocale":"en","Fallback":false,"Versions":["16","17","18","19","20"],"Locales":["en","zh-Hans"],"Signatures":null,"Spellings":null,"SQLState":null,"Evidence":null}