{"Entry":{"collection":"metric","key":"pg_stat_io-extends","name":"pg_stat_io.extends","aliases":["extends","pg_stat_io"],"metadata":{"aliases":["extends","pg_stat_io"],"category":"pg_stat_io","content_hash":"40c4e3c820018a62faaaa7f6f2119d04db8c6de8b44f1eef509131e5d5aa9022","imported_at":"2026-09-30T00:40:45.65877+08:00","name":"pg_stat_io.extends","name_zh":"","slug":"pg_stat_io-extends","summary":"Number of relation extend operations."}},"Definition":{"Collection":"metric","Key":"pg_stat_io-extends","SourceDatabase":"center","Version":"18","SourceTable":"statistics_metric","SourceKey":"pg_stat_io-extends","SourceRevision":"555610c24d53e4316da5b7d3fc25c279d96856d5e0e23ee308c328c5fa881d9f","Facts":{"comparison_data":{"field":"extends","sql_type":"bigint","units_mentioned":[],"view":"pg_stat_io"},"comparison_hash":"a8c61e6befe5bf1e94bddeb4732ff9128bf7c177b8eac9cbad3c2a66ab8bf1ae","description":["Number of relation extend operations."],"documented":true,"facts":[{"label":"View","value":"pg_stat_io"},{"label":"Field","value":"extends"},{"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":"extends","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. 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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 extends 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}