Automatic Shared Memory Management is disabled for your database instance. You realize that there arecases of SQL statements performing poorly because of repeated parsing activity， resulting in degradation ofperformance. What would be your next step to improve performance（）
A、Run the SQL Access Advisor
B、Run the Memory Advisor for the sga.
C、Run the Memory Advisor for the pga.
D、Run the Memory Advisor for the shared pool.
E、Run the Memory Advisor for the buffer cache
关于时差的描述，除了哪一个以外都是正确的？（）
A、总时差指的是一个活动不影响项目完工日期的条件下自它的最早开工可以延迟的时间量
B、随着项目的进展和项目计划的变更，时差也随之变化
C、自由时差指的是一个活动不影响任何紧后活动的最早开工的条件下可以延迟的时间量
D、总时差也叫做闲散时间，分享时差或路径时差
婴儿服用维生素D预防佝偻病，每日剂量为（）
A、100U
B、400U
C、1000U
D、5000U
E、10000U
Which syntax turns an existing constraint on?（）
A、ALTER TABLE table_name ENABLE constraint_name;
B、ALTER TABLE table_name STATUS = ENABLE CONSTRAINT constraint _ name;
C、ALTER TABLE table_name ENABLE CONSTRAINT constraint _ name;
D、ALTER TABLE table_name TURN ON CONSTRAINT constraint _ name;
当前图层（）被关闭，（）被冻结。
A、不能，可以
B、不能，不能
C、可以，可以
D、可以，不能
View the Exhibit and examine the user information. The user has been granted CONNECT and RESOURCEroles and no individual system privileges. The SL_REP user executes this command to create a table:SQL> CREATE TABLE orders(oid number(6), odate date, ccode number(4), oamt number(10,2))TABLESPACE purchase_space; The PURCHASE_SPACE tablespace already exists in the database. Which statement describes the effect ofthe command（）
A、 The command executes successfully and creates the table in the USERS tablespace.
B、 The command executes successfully and creates the table in the PURCHASE_SPACE tablespace.
C、 The command produces an error because the user does not have the privilege to create the table.
D、 The command produces an error because the user does not have quota in the PURCHASE_SPACEtablespace.