A sequence is a database object that generates a sequence of unique Numbers.
序列是一个数据库对象，它生成一系列惟一的数字。
A trusted context is a database object defining the set of properties for a connection.
可信任上下文是一个数据库对象，定义了连接的属性。
When a database object is created, it is owned by the user ID that executed the DDL statement to create it.
创建一个数据库对象时，此对象归执行 DDL 语句创建它的那个用户 ID 所拥有。
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