Oracle Drop User使用说明

最新推荐文章于 2025-09-10 20:00:00 发布

转载最新推荐文章于 2025-09-10 20:00:00 发布 · 1.7k 阅读

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本文详细介绍了在Oracle数据库中如何使用DROP USER命令删除用户及其相关对象。包括仅删除用户本身，以及通过CASCADE选项删除用户的所有对象，如表、索引、触发器等，并解释了这些操作对数据库的影响。

在搭建测试DB时，常用到删除用户及其对象的命令，也即drop user

drop user xxx;  // 仅删掉用户xxx

drop user xxx cascade; // 会删除用户及用户对应的schema下所有对象

user
Specify the user to be dropped. Oracle Database does not drop users whose schemas
contain objects unless you specify CASCADE or unless you first explicitly drop the
user's objects.

CASCADE
Specify CASCADE to drop all objects in the user's schema before dropping the user. You
must specify this clause to drop a user whose schema contains any objects.

使用cascade参数可以删除该用户的全部objects。要说明的如下：

1 If the user's schema contains tables, then Oracle Database drops the tables and
automatically drops any referential integrity constraints on tables in other schemas
that refer to primary and unique keys on these tables.

如果用户的schema中有表，则在删除表的时候自动删除与该表相关的主键和外键。

2 If this clause results in tables being dropped, then the database also drops all
domain indexes created on columns of those tables and invokes appropriate drop
routines.
如果用户的schema中有表，则在删除表的时候自动删除与该表相关的索引。

3 Oracle Database invalidates, but does not drop, the following objects in other
schemas:
删除用户时，下列在其他用户中的objects不会被删除，只会被置为无效

1 Views or synonyms for objects in the dropped user's schema
视图，同义词

2 Stored procedures, functions, or packages that query objects in the dropped
user's schema
存储过程，函数，包

4 Oracle Database does not drop materialized views in other schemas that are based
on tables in the dropped user's schema. However, because the base tables no
longer exist, the materialized views in the other schemas can no longer be
refreshed.
其他用户建立的基于被删除用户的物化视图不会被删除，只是不能在刷新了。

5 Oracle Database drops all triggers in the user's schema.
用户模式下的所有触发器全部被删除

6 Oracle Database does not drop roles created by the user.
被删除用户建立的其他用户不会被删除

以上文章转自（有部分修改）：http://blog.youkuaiyun.com/hexiankang1984/article/details/6925180