数据库管理器创建和维护两组系统编目视图，这些视图是在基本系统编目表之上定义的。
The database manager creates and maintains two sets of system catalog views that are defined on top of the base system catalog tables.
数据库管理器创建和维护两组系统编目视图，这些视图是在基本系统编目表之上定义的。
The database manager creates and maintains two sets of system catalog views that are defined on top of the base system catalog tables.
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