{"Entry":{"collection":"oid","key":"xid8","name":"xid8","aliases":[],"metadata":{"aliases":[],"category":"Transaction and row identifiers","content_hash":"0f1b788cd324f2406f1c461f19c76f0ce72fee217e8e373e2e7e4f89721144cb","derived_content_hash":"bbb72e1ba2b5479a40d26c02f40e756da29646e4c0b2fc4e4502d7d416dd7364","imported_at":"2026-09-27T17:57:59.12847+08:00","name":"xid8","name_zh":"xid8","repair_provenance":{"original_source_revision":"","receipt_sha256":"f60e04587aede4659ae5fd7068e08927c66ac4ad07258149f5b9257a0e41ba0c","repair":"wiki-repair-20261023"},"slug":"xid8","source_rev":"wiki-repair-20261023:194e767bda4c5dbd6d28f9b9ba3d33df66c4fcb3f5c69a1c54d7aae4580d82d5","summary":"Another identifier type used by the system is xid , or transaction (abbreviated xact ) identifier. This is the data type of the system columns xmin and xmax . Transaction identifiers are 32-bit quantities. In some contexts, a 64-bit variant xid8 is used. Unlike xid values, xid8 values increase strictly monotonically and cannot be reused in the lifetime of a database cluster. See Section 67.1 for more details."}},"Definition":{"Collection":"oid","Key":"xid8","SourceDatabase":"center","Version":"18","SourceTable":"oid_type","SourceKey":"xid8","SourceRevision":"8b3360302225f08ae72716ce1804596de95b568e5d31f788cb4597427b28cc38","Facts":{"description":["Another identifier type used by the system is xid , or transaction (abbreviated xact ) identifier. This is the data type of the system columns xmin and xmax . Transaction identifiers are 32-bit quantities. In some contexts, a 64-bit variant xid8 is used. Unlike xid values, xid8 values increase strictly monotonically and cannot be reused in the lifetime of a database cluster. See Section 67.1 for more details."],"description_zh":"系统使用的另一种标识符类型是 xid，即事务 ID（事务缩写为 xact）。这是系统列 xmin 和 xmax 的数据类型。事务 ID 是 32 位量。在某些上下文中会使用 64 位变体 xid8。与 xid 值不同，xid8 值严格单调递增，并且在数据库集簇的生命周期内不会被重用。更多细节见第 67.1 节。","description_zh_html":"\u003cp\u003e\n    系统使用的另一种标识符类型是 \u003ccode class=\"type\"\u003exid\u003c/code\u003e，即事务 ID（事务缩写为 \u003cabbr class=\"abbrev\"\u003exact\u003c/abbr\u003e）。这是系统列\n    \u003ccode class=\"structfield\"\u003exmin\u003c/code\u003e 和 \u003ccode class=\"structfield\"\u003exmax\u003c/code\u003e\n    的数据类型。事务 ID 是 32 位量。在某些上下文中会使用 64 位变体 \u003ccode class=\"type\"\u003exid8\u003c/code\u003e。与 \u003ccode class=\"type\"\u003exid\u003c/code\u003e 值不同，\u003ccode class=\"type\"\u003exid8\u003c/code\u003e 值严格单调递增，并且在数据库集簇的生命周期内不会被重用。更多细节见\u003ca class=\"xref\" href=\"/zh/docs/18/transaction-id.html\" title=\"67.1. 事务与标识符\"\u003e第 67.1 节\u003c/a\u003e。\n    \u003c/p\u003e","facts":[],"related":[{"label":"Section 67.1","url":"/docs/18/transaction-id.html"},{"label":"Section 5.6","url":"/docs/18/ddl-system-columns.html"}],"release":{"channel":"stable","label":"18.6","major":"18","ref":"PostgreSQL 18.6 Documentation","revision":"8b3360302225f08ae72716ce1804596de95b568e5d31f788cb4597427b28cc38"},"sections":[],"sources":[{"label":"PostgreSQL 18.6 Documentation","sha256":"8b3360302225f08ae72716ce1804596de95b568e5d31f788cb4597427b28cc38","url":"/docs/18/datatype-oid.html#DATATYPE-OID"},{"label":"PostgreSQL 18 online manual","url":"https://www.postgresql.org/docs/18/datatype-oid.html#DATATYPE-OID"}],"translation_provenance":{"inputs":[{"kind":"current-pgdoc-translation","path":"/Users/vonng/pgsty/pgdoc/zh/18/html/datatype-oid.html","sha256":"f7769489aed6ea9bae7befeda7d9264ccc2752ef906f9137b4d08dd3569bba21"}],"kind":"same-version-pgdoc","locale":"zh-Hans","source_revision":"b1b500221dbe5437cfca004d6b04d3f6e422765d","version":"18"},"zh_from":"same-version-pgdoc"},"ManualEvidence":{"release":{"channel":"stable","label":"18.6","major":"18","ref":"PostgreSQL 18.6 Documentation","revision":"8b3360302225f08ae72716ce1804596de95b568e5d31f788cb4597427b28cc38"},"sources":[{"label":"PostgreSQL 18.6 Documentation","sha256":"8b3360302225f08ae72716ce1804596de95b568e5d31f788cb4597427b28cc38","url":"/docs/18/datatype-oid.html#DATATYPE-OID"},{"label":"PostgreSQL 18 online manual","url":"https://www.postgresql.org/docs/18/datatype-oid.html#DATATYPE-OID"}]},"MeasuredEvidence":{}},"Text":{"Collection":"oid","Key":"xid8","SourceDatabase":"center","Version":"18","Locale":"en","Title":"xid8","Summary":"Another identifier type used by the system is xid , or transaction (abbreviated xact ) identifier. This is the data type of the system columns xmin and xmax . Transaction identifiers are 32-bit quantities. In some contexts, a 64-bit variant xid8 is used. Unlike xid values, xid8 values increase strictly monotonically and cannot be reused in the lifetime of a database cluster. See Section 67.1 for more details.","BodyHTML":"\u003cp\u003eAnother identifier type used by the system is xid , or transaction (abbreviated xact ) identifier. This is the data type of the system columns xmin and xmax . Transaction identifiers are 32-bit quantities. In some contexts, a 64-bit variant xid8 is used. Unlike xid values, xid8 values increase strictly monotonically and cannot be reused in the lifetime of a database cluster. See Section 67.1 for more details.\u003c/p\u003e","SourceRevision":"8b3360302225f08ae72716ce1804596de95b568e5d31f788cb4597427b28cc38","ContentHash":"d4581158f331e49bc5cdbebfb7e259dca5113d0196a02c25bf96cbcd213a9df9","Payload":{"description":["Another identifier type used by the system is xid , or transaction (abbreviated xact ) identifier. This is the data type of the system columns xmin and xmax . Transaction identifiers are 32-bit quantities. In some contexts, a 64-bit variant xid8 is used. Unlike xid values, xid8 values increase strictly monotonically and cannot be reused in the lifetime of a database cluster. See Section 67.1 for more details."],"related":[{"label":"Section 67.1","url":"/docs/18/transaction-id.html"},{"label":"Section 5.6","url":"/docs/18/ddl-system-columns.html"}],"sections":[]}},"RequestedLocale":"en","Fallback":false,"Versions":["13","14","15","16","17","18","19","20"],"Locales":["en","zh-Hans"],"Signatures":null,"Spellings":null,"SQLState":null,"Evidence":null}