Oracle uses the alter user DDL statement to register proxy users.

Oracle 使用 alter user DDL 语句注册代理用户。

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Ideally a user should be able to alter some data with one device, pick up another device, and instantly see their changes.

理想状态下，用户应该可以在一台设备上更改数据，然后拿起另一台设备立即看到刚才的更改结果。

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Because this restriction is removed, even if the database is not created in UTF-8, a user can alter a table to add an XML column or create a new table with XML columns.

由于去掉了这个限制，即使数据库不是用utf - 8格式创建的，用户也可以更改一个表以添加xml列，或者创建一个包含xml列的新表。

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