drop user和drop user cascade的区别
2015-01-26 13:28
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1.oracle数据库中删除用户有两种命令,一种是 drop user xxx;另外一个种是drop user xxx cascade;
2.官方的说明如下:
Dropping a Database User: Example If user Sidney's schema contains no objects, then you can drop sidney by issuing the statement:
DROP USER sidney; --sidney为用户名,用sys登录执行该语句
If Sidney's schema contains objects, then you must use the CASCADE clause to drop sidney and the objects:
DROP USER sidney CASCADE; --sidney为用户名,用sys登录执行该语句
就是说drop user xxx必须是这个用户下面没有任何对象,这样才可以使用这个命令,否则就会报错;如果用户下面有对象,就得用drop user xxx cascade来删除这个用户以及这个用户下的所有对象了。
2.官方的说明如下:
Dropping a Database User: Example If user Sidney's schema contains no objects, then you can drop sidney by issuing the statement:
DROP USER sidney; --sidney为用户名,用sys登录执行该语句
If Sidney's schema contains objects, then you must use the CASCADE clause to drop sidney and the objects:
DROP USER sidney CASCADE; --sidney为用户名,用sys登录执行该语句
就是说drop user xxx必须是这个用户下面没有任何对象,这样才可以使用这个命令,否则就会报错;如果用户下面有对象,就得用drop user xxx cascade来删除这个用户以及这个用户下的所有对象了。
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