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[多选] Which two statements are true regarding B-tree index()

A . The leaf blocks in the index are doubly linked.
B . The leaf node stores a bitmap for each key value.
C . The rows with NULL value in key columns also have entries in the index.
D . The deletion of a row from the table causes a logical deletion in index leaf block and the space becomes available for the new leaf entry.

Which of the following is a compelling reason to deploy IBM Systems Director Active Energy Manager (AEM) in a data center with high energy utilization?() Removes the requirement for Intelligent PDUs。 Monitor and balance disk speeds according to utilization needs。 Is a required element for EnergyStar certification of the server/data center。 Monitor and report power and thermal trending to optimize energy consumptio。 数据库管理系统 You created the ORDERS table in your database by using the following code:   SQL> CREATE TABLE ORDERS (ORDER_DATE TIMESTAMP(0) WITH TIME ZONE);   Then, you inserted data in the ORDERS table and saved it by issuing the following statements:SQL> INSERT INTO ORDERS VALUES(’18-AUG-00 10:26:44 PM America/New_York’);   SQL> INSERT INTO ORDERS VALUES(’23-AUG-02 12:46:34 PM America/New_York’);   SQL> COMMIT;   Next, you issued the following statement to change the time zone for the database:   SQL> ALTER DATABASE SET TIME_ZONE=’Europe/London’;   What will be the result of executing the above statement?()    The statement will fail.。  The statement will be executed successfully, and the new time zone will be set for the database.。  The statement will be executed successfully, but the new time zone will be set for the current session.。 The statement will be executed successfully, but the new time zone will neither be set for the database nor for a specific session.。 While querying the EMPLOYEES table, you receive an ORA-01578 message indicating block corruption in File# 1201 and Block# 1968. You analyze the table and the corruption is verified.  Which RMAN command do you use to perform BMR and repair the corrupt block?()    RECOVER FILE=1201 BLOCK=1968。  RECOVER CORRUPTION LIST。  RECOVER DATAFILE 1201 BLOCK 1968。  RECOVER BLOCK CORRUPTION LIST。  None of the above。 直流他励电动机重载运行时,若不慎将励磁回路断开,电机转速将()。 升至新的稳定值。 增至不允许的值,即“飞车”。 减速至新的稳定值。 迅速减少直至停止。 Which two statements are true regarding B-tree index()
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