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所谓LRU页面置换算法，是指（)A．将驻留在主存中的页面随便挑选一页淘汰B．将驻留在主存中的时间最

所谓LRU页面置换算法，是指()

A．将驻留在主存中的页面随便挑选一页淘汰

B．将驻留在主存中的时间最长的一页淘汰

C．将驻留在主存中近期最不常用的页面淘汰

D．将驻留在主存中最不常用页面淘汰

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更多“所谓LRU页面置换算法，是指（)A．将驻留在主存中的页面随便…”相关的问题

第1题

The DBA issues this SQL command: CREATE USER scott IDENTIFIED by tiger; What privileges does the user Scott have at this point？（）

A. no privileges

B. only the SELECT privilege

C. only the CONNECT privilege

D. all the privileges of a default user

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第2题

The DBA issues this SQL command:What privileges does the user Scott have at this point？（）

A. No privileges.

B. Only the SELECT privilege.

C. Only the CONNECT privilege.

D. All the privileges of a default user.

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第3题

View the Exhibit for some of the current parameter settings. A user logs in to the HR sche

ma and issues the following commands:SQL> CREATE TABLE emp(empno NUMBER(3),ename VARCHAR2(20),sal NUMBER(8,2));SQL> INSERT INTO emp(empno,ename) VALUES(1,‘JAMES‘);At this moment, a second user also logs in to the HR schema and issues the following command:SQL> ALTER TABLE emp MODIFY sal NUMBER(10,2);What happens in the above scenario？（）

A. The second user‘s session immediately produces the resource busy error.

B. The second user‘s command executes successfully.

C. The second user‘s session waits for a time period before producing the resource busy error.

D. A deadlock is created.

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第4题

The user Sue issues this SQL statement:GRANT SELECT ON sue. EMP TO alice WITH GRANT OPTION

; The user Alice issues this SQL statement:GRANT SELECT ON sue. EMP TO reena WITH GRANT OPTION; The user Reena issues this SQL statement:GRANT SELECT ON sue. EMP TO timber;The user Sue issues this SQL statement:REVOKE select on sue. EMP FROM alice;For which users does the revoke command revoke SELECT privileges on the SUE.EMP table？（）

A. Alice only

B. Alice and Reena

C. Alice, Reena, and Timber

D. Sue, Alice, Reena, and Timber

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第5题

The user Sue issues this SQL statement:GRANT SELECT ON sue. EMP TO alice WITH GRANT OPTION

;The user Alice issues this SQL statement:GRANT SELECT ON sue. EMP TO reena WITH GRANT OPTION;The user Reena issues this SQL statement:GRANT SELECT ON sue. EMP TO timber;The user Sue issues this SQL statement:REVOKE select on sue. EMP FROM alice;For which users does the revoke command revoke SELECT privileges on the SUE.EMP table？（）

A. Alice only

B. Alice and Reena

C. Alice, Reena, and Timber

D. Sue, Alice, Reena, and Timber

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第6题

创建SQL Server登录帐户的SQL语句是（）。

A．CREATE LOGIN

B． CREATE USER

C． ADD LOGIN

D． ADD USER

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第7题

User A issues the command: LOCK TABLES pets READ; Which command can User B execute against the pets table？（）

A.UPDATE pets…

B.SELECT….FROM pets

C.INSERT INTO pets…

D.ALTER TABLE pets…

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第8题

Scott issues the SQL statements:CREATE TABLE dept（deptno NUMBER（2),dname VARCHAR2（14),loc

Scott issues the SQL statements:CREATE TABLE dept(deptno NUMBER(2),dname VARCHAR2(14),loc VARCHAR2(13)};GRANT SELECTON DEPTT0 SUE;If Sue needs to select from Scott‘s DEPT table, which command should she use？（）

A.SELECT*FROMDEPT；

B.SELECT*FROMSCOTT.DEPT；

C.SELECT*FROMDBASCOTTDEPT；

D.SELECT*FROMALL_USERSWHEREUSER_NAME=‘；SCOTT‘；ANDTABLENAME=‘；DEPT‘；；

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第9题

当需要返回当前用户的名字，可以执行如下（）SQL语句。

A.SELECT user FROM V$DBA

B.SELECT user FROM dual

C.SELECT name FROM dual

D.SELECT name FROM V$DBA

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