{"Entry":{"collection":"metric","key":"pg_stat_activity-xact_start","name":"pg_stat_activity.xact_start","aliases":["xact_start","pg_stat_activity"],"metadata":{"aliases":["xact_start","pg_stat_activity"],"category":"pg_stat_activity","content_hash":"40bbd472f9fd429b7bb3fa6b35c855a8f29bb24f9ec78fa0fa552c918337e3ea","derived_content_hash":"bffac72f1296ddcaa2f30c17b7226edb24ad93f2e59cd8054af00a745365f761","imported_at":"2026-09-30T00:40:45.309486+08:00","name":"pg_stat_activity.xact_start","name_zh":"","slug":"pg_stat_activity-xact_start","summary":"Time when this process' current transaction was started, or null if no transaction is active. If the current query is the first of its transaction, this column is equal to the query_start column."}},"Definition":{"Collection":"metric","Key":"pg_stat_activity-xact_start","SourceDatabase":"center","Version":"18","SourceTable":"statistics_metric","SourceKey":"pg_stat_activity-xact_start","SourceRevision":"555610c24d53e4316da5b7d3fc25c279d96856d5e0e23ee308c328c5fa881d9f","Facts":{"comparison_data":{"field":"xact_start","sql_type":"timestamp with time zone","units_mentioned":[],"view":"pg_stat_activity"},"comparison_hash":"4762a441445fb0a2e1bd0aeb5fd77224702a17702709e3ef679129eed3914c3f","description":["Time when this process' current transaction was started, or null if no transaction is active. If the current query is the first of its transaction, this column is equal to the query_start column."],"description_zh":"这个进程的当前事务被启动的时间，如果没有活动事务则为空值。如果当前查询是其事务中的第一个查询，这一列等于 query_start 列。","description_zh_html":"\u003cp\u003epg_stat_activity.xact_start 统计字段。\u003c/p\u003e\u003cdl\u003e\u003cdt\u003e视图\u003c/dt\u003e\u003cdd\u003e\u003ccode\u003epg_stat_activity\u003c/code\u003e\u003c/dd\u003e\u003cdt\u003e字段\u003c/dt\u003e\u003cdd\u003e\u003ccode\u003exact_start\u003c/code\u003e\u003c/dd\u003e\u003cdt\u003eSQL 类型\u003c/dt\u003e\u003cdd\u003e\u003ccode\u003etimestamp with time zone\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这个进程的当前事务被启动的时间，如果没有活动事务则为空值。如果当前查询是其事务中的第一个查询，这一列等于 query_start 列。\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_activity"},{"label":"Field","value":"xact_start"},{"label":"SQL type","value":"timestamp with time zone"},{"label":"Units named in the field definition","value":"Not specified"},{"label":"Reset observation","value":"No stats_reset field is documented for this view"}],"facts_zh":[{"label":"视图","value":"pg_stat_activity"},{"label":"字段","value":"xact_start"},{"label":"SQL 类型","value":"timestamp with time zone"},{"label":"字段定义记载的单位","value":"未指定"},{"label":"重置条件","value":"手册未为此视图记载 stats_reset 字段"}],"field":"xact_start","manual_html":"","manual_path":"/docs/18/monitoring-stats.html","related":[{"label":"pg_stat_activity columns","url":"/wiki/catalog/pg_stat_activity/?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_activity view will have one row per server process, showing information related to the current activity of that process."],"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 xact_start FROM pg_catalog.pg_stat_activity;","paragraphs":["Example query; no execution result or measured value is asserted."],"title":"Inspect this field"}],"sections_zh":[{"paragraphs":["pg_stat_activity 视图每个服务器进程将有一行，显示与该进程当前活动相关的信息。"],"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 xact_start FROM pg_catalog.pg_stat_activity;","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 xact_start FROM pg_catalog.pg_stat_activity;","source_only":false,"sources":[{"label":"PostgreSQL 18 English manual","path":"monitoring-stats.html","sha256":"aa979eed08627fbf715a9d792094a162a73671db5af810f3ab2aad3e073d5722","url":"/docs/18/monitoring-stats.html#PG-STAT-ACTIVITY-VIEW"}],"sql_type":"timestamp with time zone","tables":[],"tables_zh":[],"units_mentioned":[],"view":"pg_stat_activity","zh_from":{"authored_translation":"source-derived-structured-summary","body_sha256":"a46b734e352131e784f11cc6063a21793dcdc344098e448257b033f26f5f95d6","kind":"same-version-chinese-manual-with-source-derived-structured-summary","manual":{"anchor":"","build_id":107,"column":"xact_start","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-ACTIVITY-VIEW"}]},"MeasuredEvidence":{}},"Text":{"Collection":"metric","Key":"pg_stat_activity-xact_start","SourceDatabase":"center","Version":"18","Locale":"en","Title":"pg_stat_activity.xact_start","Summary":"Time when this process' current transaction was started, or null if no transaction is active. If the current query is the first of its transaction, this column is equal to the query_start column.","BodyHTML":"\u003cp\u003eTime when this process\u0026#39; current transaction was started, or null if no transaction is active. If the current query is the first of its transaction, this column is equal to the query_start column.\u003c/p\u003e","SourceRevision":"555610c24d53e4316da5b7d3fc25c279d96856d5e0e23ee308c328c5fa881d9f","ContentHash":"807fa8423aac553e9e7ffe64ad4768819ec216474e56faa53c355e8a3bdb2f92","Payload":{"description":["Time when this process' current transaction was started, or null if no transaction is active. If the current query is the first of its transaction, this column is equal to the query_start column."],"manual_html":"","related":[{"label":"pg_stat_activity columns","url":"/wiki/catalog/pg_stat_activity/?v=18"},{"label":"Statistics collection and reset functions","url":"/docs/18/monitoring-stats.html"}],"sections":[{"paragraphs":["The pg_stat_activity view will have one row per server process, showing information related to the current activity of that process."],"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 xact_start FROM pg_catalog.pg_stat_activity;","paragraphs":["Example query; no execution result or measured value is asserted."],"title":"Inspect this field"}],"tables":[]}},"RequestedLocale":"en","Fallback":false,"Versions":["10","11","12","13","14","15","16","17","18","19","20"],"Locales":["en","zh-Hans"],"Signatures":null,"Spellings":null,"SQLState":null,"Evidence":null}