下列有关数据库的描述,正确的是( )。
A、数据库设计是指设计数据库管理系统
B、数据库技术的根本目标是要解决数据共享的问题
C、数据库是一个独立的系统,不需要操作系统的支持
D、数据库系统中,数据的物理结构必须与逻辑结构一致
相关试题
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Which two statements about MPLS label-switched paths (LSPs) are true? ()
ALSPs are bidirectional.
BLSPs are unidirectional.
CLSPs must follow the IGP's shortest path.
DLSPs can follow paths other than the IGP's shortest path.
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While attempting to load a base operating system to a machine, an administrator is receiving bootp timeout error messages. What steps should be followed to troubleshoot communications between the NIM master and the client machine?()
A、View debug logs on NIM master for errors or failures.
B、Boot the client machine to SMS, and view the POST Error log.
C、Boot the client machine to SMS, setup remote IPL, and execute a ping test.
D、Boot the client machine to diagnostics, and ping the client from the NIM master.
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Which two create an instance of an array?()
Aint ia = new int [15];
Bfloat fa = new float [20];
Cchar ca = “Some String”;
DObject oa = new float[20];
EInt ia = (4, 5, 6) (1, 2, 3)
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由核心家庭及其较近的亲戚组成,如叔叔、姑姑、姨妈等,属于()
A、核心家庭
B、主干家庭
C、联合家庭
D、兄弟姐妹组成的家庭
E、同性恋家庭
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To make audit information more productive, the DBA executes the following command before startingan audit operation: SQL> ALTER SYSTEM SET AUDIT_TRAIL=DB,EXTENDED SCOPE=SPFILE; Which statement is true regarding the audit record generated when auditing starts after restarting thedatabase()
A、It contains only the plan for the SQL statement executed by the user.
B、It contains the SQL text executed by the user and the bind variables used with it.
C、It contains the plan and statistics associated with the SQL statement executed by the user.
D、It contains the plan for the SQL statement executed by the user and the bind variables used with it.