{"Entry":{"collection":"metric","key":"pg_stat_replication-replay_lag","name":"pg_stat_replication.replay_lag","aliases":["replay_lag","pg_stat_replication"],"metadata":{"aliases":["replay_lag","pg_stat_replication"],"category":"pg_stat_replication","content_hash":"848d8b7fd73909caa2d79bac152823cb0e68727c4aed6a402c45f74ec1ecd267","imported_at":"2026-09-30T00:40:46.080482+08:00","name":"pg_stat_replication.replay_lag","name_zh":"","slug":"pg_stat_replication-replay_lag","summary":"Time elapsed between flushing recent WAL locally and receiving notification that this standby server has written, flushed and applied it. This can be used to gauge the delay that synchronous_commit level remote_apply incurred while committing if this server was configured as a synchronous standby."}},"Definition":{"Collection":"metric","Key":"pg_stat_replication-replay_lag","SourceDatabase":"center","Version":"18","SourceTable":"statistics_metric","SourceKey":"pg_stat_replication-replay_lag","SourceRevision":"555610c24d53e4316da5b7d3fc25c279d96856d5e0e23ee308c328c5fa881d9f","Facts":{"comparison_data":{"field":"replay_lag","sql_type":"interval","units_mentioned":[],"view":"pg_stat_replication"},"comparison_hash":"97052561d644196937057eebf96b5d5b3a43e3afacf041e0c1f4ceed6f66ea5e","description":["Time elapsed between flushing recent WAL locally and receiving notification that this standby server has written, flushed and applied it. This can be used to gauge the delay that synchronous_commit level remote_apply incurred while committing if this server was configured as a synchronous standby."],"documented":true,"facts":[{"label":"View","value":"pg_stat_replication"},{"label":"Field","value":"replay_lag"},{"label":"SQL type","value":"interval"},{"label":"Units named in the field definition","value":"Not specified"},{"label":"Reset observation","value":"No stats_reset field is documented for this view"}],"field":"replay_lag","manual_html":"","manual_path":"/docs/18/monitoring-stats.html","related":[{"label":"pg_stat_replication columns","url":"/wiki/catalog/pg_stat_replication/?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_replication view will contain one row per WAL sender process, showing statistics about replication to that sender's connected standby server. Only directly connected standbys are listed; no information is available about downstream standby servers."],"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 replay_lag FROM pg_catalog.pg_stat_replication;","paragraphs":["Example query; no execution result or measured value is asserted."],"title":"Inspect this field"}],"signature":"SELECT replay_lag FROM pg_catalog.pg_stat_replication;","source_only":false,"sources":[{"label":"PostgreSQL 18 English manual","path":"monitoring-stats.html","sha256":"aa979eed08627fbf715a9d792094a162a73671db5af810f3ab2aad3e073d5722","url":"/docs/18/monitoring-stats.html#PG-STAT-REPLICATION-VIEW"}],"sql_type":"interval","tables":[],"units_mentioned":[],"view":"pg_stat_replication"},"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-REPLICATION-VIEW"}]},"MeasuredEvidence":{}},"Text":{"Collection":"metric","Key":"pg_stat_replication-replay_lag","SourceDatabase":"center","Version":"18","Locale":"en","Title":"pg_stat_replication.replay_lag","Summary":"Time elapsed between flushing recent WAL locally and receiving notification that this standby server has written, flushed and applied it. This can be used to gauge the delay that synchronous_commit level remote_apply incurred while committing if this server was configured as a synchronous standby.","BodyHTML":"\u003cp\u003eTime elapsed between flushing recent WAL locally and receiving notification that this standby server has written, flushed and applied it. This can be used to gauge the delay that synchronous_commit level remote_apply incurred while committing if this server was configured as a synchronous standby.\u003c/p\u003e","SourceRevision":"555610c24d53e4316da5b7d3fc25c279d96856d5e0e23ee308c328c5fa881d9f","ContentHash":"5e6e62799ccc63ef5d8a69cb32aa4331f8de05d3440d13662e9b6a0277c90586","Payload":{"description":["Time elapsed between flushing recent WAL locally and receiving notification that this standby server has written, flushed and applied it. This can be used to gauge the delay that synchronous_commit level remote_apply incurred while committing if this server was configured as a synchronous standby."],"manual_html":"","related":[{"label":"pg_stat_replication columns","url":"/wiki/catalog/pg_stat_replication/?v=18"},{"label":"Statistics collection and reset functions","url":"/docs/18/monitoring-stats.html"}],"sections":[{"paragraphs":["The pg_stat_replication view will contain one row per WAL sender process, showing statistics about replication to that sender's connected standby server. Only directly connected standbys are listed; no information is available about downstream standby servers."],"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 replay_lag FROM pg_catalog.pg_stat_replication;","paragraphs":["Example query; no execution result or measured value is asserted."],"title":"Inspect this field"}],"tables":[]}},"RequestedLocale":"zh-Hans","Fallback":true,"Versions":["10","11","12","13","14","15","16","17","18","19","20"],"Locales":["en"],"Signatures":null,"Spellings":null,"SQLState":null,"Evidence":null}