postgresql select for update

相關問題 & 資訊整理

postgresql select for update

You must have SELECT privilege on each column used in a SELECT command. The use of FOR NO KEY UPDATE, FOR UPDATE, FOR SHARE or FOR KEY ... ,PostgreSQL doesn't remember any information about modified rows in memory, so there is no limit on the number of rows locked at one time. However, locking a row might cause a disk write, e.g., SELECT FOR UPDATE modifies selected rows to mark them lock,FOR UPDATE and FOR SHARE. Although FOR UPDATE appears in the SQL standard, the standard allows it only as an option of DECLARE CURSOR. PostgreSQL allows it in any SELECT query as well as in sub-SELECTs, but this is an extension. The FOR SHARE variant, and,The WITH clause allows you to specify one or more subqueries that can be referenced by name in the UPDATE query. See Section 7.8 and SELECT for details. ,You must have SELECT privilege on each column used in a SELECT command. The use of FOR NO KEY UPDATE, FOR UPDATE, FOR SHARE or FOR KEY ... ,If FOR UPDATE or FOR SHARE is specified, the SELECT statement locks the selected rows against concurrent updates. (See FOR UPDATE/FOR SHARE ... , Does it matter which columns I select? No, it doesn't matter. Even if SELECT 1 FROM table WHERE ... FOR UPDATE is used, the query locks all ..., Other transactions can update or delete the data you just queried. PostgreSQL offers additional select statements that lock on read and provide ...

相關軟體 PostgreSQL 資訊

PostgreSQL
PostgreSQL 是一個跨平台的對象關係型數據庫管理系統,自 1995 年首次發布以來,已經成長為國際知名的解決方案,可幫助管理員輕鬆創建,組織,管理和部署各種形狀和大小的項目數據庫。這當然包括對運行 SQL 查詢,觸發管理,屬性管理以及其他企業級數據庫管理系統當前正在使用的所有功能的全面控制。為使日常管理多個作業和項目組件的管理員更容易訪問,PostgreSQL 符合大多數 SQL 2008... PostgreSQL 軟體介紹

postgresql select for update 相關參考資料
PostgreSQL: Documentation: 9.5: SELECT

You must have SELECT privilege on each column used in a SELECT command. The use of FOR NO KEY UPDATE, FOR UPDATE, FOR SHARE or FOR KEY ...

https://www.postgresql.org

PostgreSQL: Documentation: 9.4: Explicit Locking

PostgreSQL doesn't remember any information about modified rows in memory, so there is no limit on the number of rows locked at one time. However, locking a row might cause a disk write, e.g., SEL...

https://www.postgresql.org

PostgreSQL: Documentation: 9.0: SELECT

FOR UPDATE and FOR SHARE. Although FOR UPDATE appears in the SQL standard, the standard allows it only as an option of DECLARE CURSOR. PostgreSQL allows it in any SELECT query as well as in sub-SELECT...

https://www.postgresql.org

PostgreSQL: Documentation: 9.5: UPDATE

The WITH clause allows you to specify one or more subqueries that can be referenced by name in the UPDATE query. See Section 7.8 and SELECT for details.

https://www.postgresql.org

PostgreSQL: Documentation: 9.6: SELECT

You must have SELECT privilege on each column used in a SELECT command. The use of FOR NO KEY UPDATE, FOR UPDATE, FOR SHARE or FOR KEY ...

https://www.postgresql.org

PostgreSQL: Documentation: 9.1: SELECT

If FOR UPDATE or FOR SHARE is specified, the SELECT statement locks the selected rows against concurrent updates. (See FOR UPDATE/FOR SHARE ...

https://www.postgresql.org

postgresql - Postgres SELECT ... FOR UPDATE in functions - Stack ...

Does it matter which columns I select? No, it doesn't matter. Even if SELECT 1 FROM table WHERE ... FOR UPDATE is used, the query locks all ...

https://stackoverflow.com

Selecting for Share and Update in PostgreSQL - Shiroyasha

Other transactions can update or delete the data you just queried. PostgreSQL offers additional select statements that lock on read and provide ...

http://shiroyasha.io