You issued the following statement to monitor the usage of the index: SQL> ALTER INDEX SCOTT.EMP_IDX MONITORING USAGE; Which view will you query to ensure that the index is being monitored?()
第1题:
An index called ORD_CUSTNAME_IX has been created on the CUSTNAME column in the ORDERS table using the following command:SQL>CREATE INDEX ord_custname_ix ON orders(custname);The ORDERS table is frequently queried using the CUSTNAME column in the WHERE clause.You want to check the impact on the performance of the queries if the index is not available. You do not want the index to be dropped or rebuilt to perform this test.Which is the most efficient method of performing this task?()
A. disabling the index
B. making the index invisible
C. making the index unusable
D. using the MONITORING USAGE clause for the index
第2题:
You moved the index EMP_NO_INDX from one tablespace to another and then issued the following command to rebuild the index EMP_NO_INDX: SQL> ALTER INDEX EMP_NO_INDX REBUILD ONLINE; Which table allows the users to access the EMP_NO_INDX index while performing the rebuild operation?()
第3题:
( 31 )下列 SQL 语句中,哪一(些)组包含了不正确的定义语句?
I . CREATE TABLE … CREATE VIEW … CREATE INDEX …
II . DROP TABLE … DROP VIEW … DROP INDEX …
III . ALTER TABLE … ALTER VIEW … ALTER INDEX …
A )只有 I
B )只有 II
C )只有 III
D ) I 和 II
第4题:
You executed the following procedure to collect statistics regarding an index: SQL>ANALYZE INDEX EMP_ID VALIDATE STRUCTURE; Which view will you use to determine whether you need to rebuild the index or not?()
第5题:
An index called ORD_CUSTNAME_IX has been created on the CUSTNAME column in the ORDERS table using the following command: SQL>CREATE INDEX ord_custname_ix ON orders(custname); The ORDERS table is frequently queried using the CUSTNAME column in the WHERE clause. You want to check the impact on the performance of the queries if the index is not available. You do not want the index to be dropped or rebuilt to perform this test. Which is the most efficient method of performing this task?()
第6题:
View the Exhibit for some of the parameter settings. You start a session and issue the following command:SQL>CREATE INDEX emp_ename ON emp(ename) TABLESPACE users INVISIBLE;What is the outcome of the above command?()
A. The index is not used by the optimizer but is maintained during DML operations.
B. The index is not used by the optimizer and is not maintained during DML operations.
C. The index is used by the optimizer only if a hint is specified in the query statement and is maintained during DML operations.
D. The index is used by the optimizer only if a hint is specified in the query statement but is not maintained during DML operations.
第7题:
You are a DBA of your company. You created a database named SALES on an Oracle 10g instance. You have defined an index named INDEX1 on the database table named INVENTORY. Users are complaining that queries accessing the INVENTORY table are running slow. Upon investigation you determine that the tablespace where the index is located is experiencing high I/O and you decide to relocate the index to another tablespace. Which of these will be the best way to accomplish this objective?()
第8题:
(32)下列 SQL 的数据定义语句组中,( )包含了不正确的数据定义语句。
Ⅰ.CREATE TABLE? CREATE VIEW? CREATE INDEX?
Ⅱ.DROP TABLE? DROP VIEW? DROP INDEX?
Ⅲ.ALTER TABLE? ALTER VIEW? ALTER INDEX?
A)仅Ⅰ
B)仅Ⅱ
C)仅Ⅲ
D)都包含
第9题:
You have many users complaining about slow inserts into a large table. While investigating the reason, you find that the number of indexes on the table is high. You want to find out which indexes are not being used. Which method would you follow to achieve this?()
第10题:
The EMPLOYEES table has six indexes and DML operations are slow. Which command begins monitoring the EMPLOYEE_IDX_FK index to determine whether it has been used by an execution plan?()