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on commit delete rows and on commit preserve rows

原创 Linux操作系统 作者:tolywang 时间:2007-08-24 00:00:00 0 删除 编辑

ON COMMIT
The ON COMMIT clause is relevant only if you are creating a temporary table. This clause specifies whether the data in the temporary table persists for the duration of a transaction or a session.




DELETE ROWS
Specify DELETE ROWS for a transaction-specific temporary table (this is the default). Oracle will truncate the table (delete all its rows) after each commit.

PRESERVE ROWS
Specify PRESERVE ROWS for a session-specific temporary table. Oracle will truncate the table (delete all its rows) when you terminate the session.

http://download-west.oracle.com/docs/cd/B10501_01/server.920/a96540/statements_73a.htm#2159530

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