{"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","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."],"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."}],"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"}],"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":[],"units_mentioned":[],"view":"pg_stat_io"},"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":"zh-Hans","Fallback":true,"Versions":["16","17","18","19","20"],"Locales":["en"],"Signatures":null,"Spellings":null,"SQLState":null,"Evidence":null}