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Wiki / 锁

SHARE

Conflicts with the ROW EXCLUSIVE, SHARE UPDATE EXCLUSIVE, SHARE ROW EXCLUSIVE, EXCLUSIVE, and ACCESS EXCLUSIVE lock modes. This mode protects a table against concurrent data changes. Acquired by CREATE INDEX (without CONCURRENTLY).

当前阅读 PG 18·选择有来源记录的版本

此版本暂无所选语言的定义,以下显示原始英文内容。

兼容性

比较不同事务持有同一对象的锁 表锁.

查看完整兼容性矩阵

取得此锁模式的命令

SQL 命令对象、阶段与条件
CREATE INDEX (without CONCURRENTLY)Lock the indexed table, preventing concurrent writes. 来源
REINDEX (parent table)Ordinary REINDEX takes SHARE on the table and ACCESS EXCLUSIVE on the index itself. The index lock is not an ACCESS EXCLUSIVE lock on the whole table. 来源
LOCK TABLE … IN SHARE MODERequest this table mode explicitly. Omitting IN MODE defaults to ACCESS EXCLUSIVE. 来源

其他锁模式

conflicts
row-exclusive, share-update-exclusive, share-row-exclusive, exclusive, access-exclusive
summary
Conflicts with the ROW EXCLUSIVE, SHARE UPDATE EXCLUSIVE, SHARE ROW EXCLUSIVE, EXCLUSIVE, and ACCESS EXCLUSIVE lock modes. This mode protects a table against concurrent data changes.

版本定义 PG 18

Conflicts with the ROW EXCLUSIVE, SHARE UPDATE EXCLUSIVE, SHARE ROW EXCLUSIVE, EXCLUSIVE, and ACCESS EXCLUSIVE lock modes. This mode protects a table against concurrent data changes. Acquired by CREATE INDEX (without CONCURRENTLY).

比较版本

完整来源事实

commands

map[label:CREATE INDEX (without CONCURRENTLY) note:Lock the indexed table, preventing concurrent writes. slug:create-index source:map[kind:documentation path:doc/src/sgml/mvcc.sgml revision:753057e340da8f22e57c9a409ea7a235fd6a46bd sha256:4b7bf77ee0af4b86052330ff2421d567df3604b75fe7d4f522bec84fdea87340 url:https://raw.githubusercontent.com/postgres/postgres/753057e340da8f22e57c9a409ea7a235fd6a46bd/doc/src/sgml/mvcc.sgml] source_url:https://www.postgresql.org/docs/18/explicit-locking.html variant:4fb8b98d99e5], map[label:REINDEX (parent table) note:Ordinary REINDEX takes SHARE on the table and ACCESS EXCLUSIVE on the index itself. The index lock is not an ACCESS EXCLUSIVE lock on the whole table. slug:reindex source:map[kind:source path:src/backend/catalog/index.c revision:753057e340da8f22e57c9a409ea7a235fd6a46bd sha256:98a4156a5c21ae856a3b583b633cdeb578a5b69910386c9f166d69fcb04ba2d0 url:https://raw.githubusercontent.com/postgres/postgres/753057e340da8f22e57c9a409ea7a235fd6a46bd/src/backend/catalog/index.c] source_url:https://github.com/postgres/postgres/blob/753057e340da8f22e57c9a409ea7a235fd6a46bd/src/backend/catalog/index.c variant:b693e4d33c3d], map[label:LOCK TABLE … IN SHARE MODE note:Request this table mode explicitly. Omitting IN MODE defaults to ACCESS EXCLUSIVE. slug:lock source:map[kind:documentation path:doc/src/sgml/mvcc.sgml revision:753057e340da8f22e57c9a409ea7a235fd6a46bd sha256:4b7bf77ee0af4b86052330ff2421d567df3604b75fe7d4f522bec84fdea87340 url:https://raw.githubusercontent.com/postgres/postgres/753057e340da8f22e57c9a409ea7a235fd6a46bd/doc/src/sgml/mvcc.sgml] source_url:https://www.postgresql.org/docs/18/explicit-locking.html variant:08d1f5a928d3]

provenance

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来源引用

完整定义与证据 JSON

定义来源

center · PostgreSQL 18 · 10:f4e8f137bfb08a664c8288824c1e36b5143ac875;11:170e416034ec0231d9e9238f2577eeb76ca8d181;12:3f302f0ed06f69c5ebd33d4df95895323a3cbef6;13:05f6c9ec2c475fae8fdd56ae40bd01afcf70d1f2;14:fba35c7c28a567839faba867db0808564c0a66db;15:0351991b8e7c7b64382e2f30ce581a8f276590a6;16:dcc37b7099a9f3cf2c75167d8dc92e75f96bc1fa;17:163288afd32a448244c8df75b3c33181aadd7f20;18:753057e340da8f22e57c9a409ea7a235fd6a46bd;19:b73d13c32c834a2c8e1c60cb92f79530376cedf1;20:2c10c2ce4d7bcd57543a49ab402af02a39724e0a

正文语言: en · 10:f4e8f137bfb08a664c8288824c1e36b5143ac875;11:170e416034ec0231d9e9238f2577eeb76ca8d181;12:3f302f0ed06f69c5ebd33d4df95895323a3cbef6;13:05f6c9ec2c475fae8fdd56ae40bd01afcf70d1f2;14:fba35c7c28a567839faba867db0808564c0a66db;15:0351991b8e7c7b64382e2f30ce581a8f276590a6;16:dcc37b7099a9f3cf2c75167d8dc92e75f96bc1fa;17:163288afd32a448244c8df75b3c33181aadd7f20;18:753057e340da8f22e57c9a409ea7a235fd6a46bd;19:b73d13c32c834a2c8e1c60cb92f79530376cedf1;20:2c10c2ce4d7bcd57543a49ab402af02a39724e0a