Schema definition:

模式定義：

By executing set of data definition statements, DBA creates the original database schema in DDL. It stores the structure of the database and provides the method to access definitions.

通過執行一組數據定義語句，DBA在DDL中創建原始數據庫模式。 它存儲數據庫的結構，并提供訪問定義的方法。

Schema and physical-organization modification:

架構和物理組織修改：

To replicate the changing needs of the organization or to modify the physical organization to advance its performance, DBA brings out changes in the schema.

為了復制組織不斷變化的需求或修改物理組織以提高其性能，DBA會在架構中進行更改。

Granting of authorization for data access:

授予數據訪問授權：

To access various parts of the database by different users, authorization needs to be granted, which can be done through DBA. The information about the authorization is kept private within the special system structure such that when an attempt is made to access the data in the system, the database system consults it with DBA.

要由不同的用戶訪問數據庫的各個部分，需要授予授權，可以通過DBA進行授權。 有關授權的信息在特殊的系統結構中保持私有狀態，這樣，當嘗試訪問系統中的數據時，數據庫系統將與DBA進行協商。

Routine maintenance:

例行維修：

Routine maintenance activities can be done through various methodology:

日常維護活動可以通過多種方法完成：