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(zhí)行一組數(shù)據(jù)定義語句，DBA在DDL中創(chuàng)建原始數(shù)據(jù)庫模式。 它存儲數(shù)據(jù)庫的結(jié)構(gòu)，并提供訪問定義的方法。

Schema and physical-organization modification:

架構(gòu)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(fù)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(gòu)中進(jìn)行更改。

Granting of authorization for data access:

授予數(shù)據(jù)訪問授權(quán)：

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(shù)據(jù)庫的各個(gè)部分，需要授予授權(quán)，可以通過DBA進(jìn)行授權(quán)。 有關(guān)授權(quán)的信息在特殊的系統(tǒng)結(jié)構(gòu)中保持私有狀態(tài)，這樣，當(dāng)嘗試訪問系統(tǒng)中的數(shù)據(jù)時(shí)，數(shù)據(jù)庫系統(tǒng)將與DBA進(jìn)行協(xié)商。

Routine maintenance:

例行維修：

Routine maintenance activities can be done through various methodology:

日常維護(hù)活動可以通過多種方法完成：