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子模式DDL用来描述()。
A.数据库的总体逻辑结构
B.数据库的局部逻辑结构
C.数据库的物理存储结构
D.数据库的概念结构
B.数据库的局部逻辑结构
C.数据库的物理存储结构
D.数据库的概念结构
参考答案
参考解析
解析:数据库模式定义语言DDL,是用于描述数据库中要存储的现实世界实体的语言。一个数据库模式包含该数据库中所有实体的描述定义。子模式DDL用来描述数据库的局部逻辑结构。
更多 “子模式DDL用来描述()。A.数据库的总体逻辑结构 B.数据库的局部逻辑结构 C.数据库的物理存储结构 D.数据库的概念结构” 相关考题
考题
Examine the following command;ALTER SYSTEM SET enable_ddl_logging = TRUE;Which statement is true?()
A. Only the data definition language (DDL) commands that resulted in errors are logged in the alert log file.B. All DDL commands are logged in the alert log file.C. All DDL commands are logged in a different log file that contains DDL statements and their execution dates.D. Only DDL commands that resulted in the creation of new segments are logged.E. All DDL commands are logged in XML format in the alert directory under the Automatic Diagnostic Repository (ADR) home.
考题
单选题Examine the following command; ALTER SYSTEM SET enable_ddl_logging = TRUE; Which statement is true?()A
Only the data definition language (DDL) commands that resulted in errors are logged in the alert log file.B
All DDL commands are logged in the alert log file.C
All DDL commands are logged in a different log file that contains DDL statements and their execution dates.D
Only DDL commands that resulted in the creation of new segments are logged.E
All DDL commands are logged in XML format in the alert directory under the Automatic Diagnostic Repository (ADR) home.
考题
单选题Examine the following command:ALTER SYSTEM SET enable_ddl_logging=FALSE;Which statement is true?()A
None of the data definition language (DDL) statements are logged in the trace file.B
Only DDL commands that resulted in errors are logged in the alert log file.C
A new log.xml file that contains the DDL statements is created, and the DDL command details are removed from the alert log file.D
Only DDL commands that resulted in the creation of new database files are logged.
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