An index called ORD_CUSTNAME_IX has been created on the CUSTNAME column in the ORDERS table using the following command： SQLCREATE 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 indexB、 making the index invisibleC、 making the index unusableD、 using the MONITORING USAGE clause for the index
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
相关考题：
Examine the structure of the EMPLOYEES table:Column name Data type RemarksEMPLOYEE_ID NUMBER NOT NULL, Primary KeyLAST_NAME VARCNAR2(30)FIRST_NAME VARCNAR2(30)JOB_ID NUMBERSAL NUMBERMGR_ID NUMBER References EMPLOYEE_ID column DEPARTMENT_ID NUMBERYou need to create an index called NAME_IDX on the first name and last name fields of the EMPLOYEES table. Which SQL statement would you use to perform this task? （）A. CREATE INDEX NAME _IDX (first_name, last_name);B. CREATE INDEX NAME _IDX (first_name, AND last_name)C. CREATE INDEX NAME_IDX ON (First_name, last_name);D. CREATE INDEX NAME_IDX ON employees (First_name, AND last_name);E. CREATE INDEX NAME_IDX ON employees (First_name, last_name);F. CREATE INDEX NAME_IDX FOR employees (First_name, last_name);
变量定义语句Dim Index与下面的______等价。 ( )A．Dim Index As LongB．Dim Index As IntegerC．Dim Index As SingleD．Dim Index As Double
Examine the following output： SQL SELECT index_name，status FROM dba_indexes WHERE status=’UNUSABLE’； INDEX_NAME STATUS------------------------------ ----------- EIND UNUSABLE Which two statements about the above index are true（）A、It is ignored by the query optimizer.B、It is not used while the index is being rebuilt.C、The index cannot be rebuilt， and has to be re-created.D、The index is automatically rebuilt when used the next time
下列属于：eq（index）与：nth-child（index）的区别的有（）。A、：eq（index）只匹配一个元素，而：nth-child（index）将为每一个符合条件的父元素匹配子元素B、：eq（index）的index从0开始，而：nth-child（index）的index从1开始C、：eq（index）的index从1开始，而：nth-child（index）的index从0开始D、：eq（index）匹配多个元素，而：nth-child（index）将为每一个符合条件的父元素匹配子元素
为了监视索引的空间使用效率，可以首先分析该索引的结构，使用（）语句，然后查询INDEX_STATE视图。A、SELECT INDEX … VALIDATE STRUCTUREB、ANALYZE INDEX … VALIDATE STRUCTUREC、UPDATE INDEX … VALIDATE STRUCTURED、REBUILD INDEX … VALIDATE STRUCTURE
An index called ORD_CUSTNAME_IX has been created on the CUSTNAME column in the ORDERS table using the following command: SQLCREATE 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 indexB、making the index invisibleC、making the index unusableD、using the MONITORING USAGE clause for the index
A bitmap join index is defined as（）.A、An index used to join two bitmap indexes on a table.B、A bitmap index created for the join of two or more tables.C、A bitmap index created on the join of two or more indexes.D、A bitmap index created on the join of two or more indexed-organized tables.
You have altered a non-unique index to be invisible to determine if queries execute within an acceptable response time without using this index. Which two are possible if table updates are performed which affect the invisible index columns?（）A、The index remains invisible.B、The index is not updated by the DML statements on the indexed table.C、The index automatically becomes visible in order to have it updated by DML on the table.D、The index becomes unusable but the table is updated by the DML.E、The index is updated by the DML on the table.
单选题An index-organized table （IOT） called SPARSE has had many records deleted. Which command reorganizes the IOT so that the empty space is removed， while minimizing the impact for users？（）AEXPORT with TABLES and IMPORT with the INDEX and IGNORE options.BALTER TABLE … COALESCE ；CALTER INDEX …REBUILD ONLINE；DCREATE TABLE …AS SELECT_ONLINE；
多选题In which scenarios would you rebuild an index？（）Awhen you need to disable the index usageBwhen you need to change storage optionsCwhen you need to enable index monitoringDwhen you need to move the index to another tablespace
单选题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？（）A Rebuild the index.B Coalesce the index.C Drop and re-create the index in the new tablespace.D Relocate the index using the ALTER INDEX...MOVE statement.
单选题为了监视索引的空间使用效率，可以首先分析该索引的结构，使用（）语句，然后查询INDEX_STATE视图。ASELECT INDEX … VALIDATE STRUCTUREBANALYZE INDEX … VALIDATE STRUCTURECUPDATE INDEX … VALIDATE STRUCTUREDREBUILD INDEX … VALIDATE STRUCTURE
单选题An index called ORD_CUSTNAME_IX has been created on the CUSTNAME column in the ORDERS table using the following command： SQLCREATE 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 indexB making the index invisibleC making the index unusableD using the MONITORING USAGE clause for the index
多选题You have altered a non-unique index to be invisible to determine if queries execute within an acceptable response time without using this index. Which two are possible if table updates are performed which affect the invisible index columns?（）AThe index remains invisible.BThe index is not updated by the DML statements on the indexed table.CThe index automatically becomes visible in order to have it updated by DML on the table.DThe index becomes unusable but the table is updated by the DML.EThe index is updated by the DML on the table.
单选题Youre performing tablespace point-in-time recovery on a tablespace called USERS. If an object in that tablespace has a foreign key constraint owned by another object in the INDEX_TBS which statement is true？（）A You cannot perform the TSPITR with the constraints enabled.B You must perform the TSPITR recovery of both tablespaces for it to be successful.C You can perform TSPITR only on the USERS tablespace.D RMAN will determine if the INDEX_TBS tablespace must also be duplicated and will duplicate it automatically.E The TSPITR will only be successful if the constraint is enabled.
单选题Examine the structure of the EMPLOYEES table: Column name Data type Remarks EMPLOYEE_ID NUMBER NOT NULL, Primary Key LAST_NAME VARCNAR2(30) FIRST_NAME VARCNAR2(30) JOB_ID NUMBER SAL NUMBER MGR_ID NUMBER References EMPLOYEE_ID column DEPARTMENT_ID NUMBER You need to create an index called NAME_IDX on the first name and last name fields of the EMPLOYEES table. Which SQL statement would you use to perform this task?（）ACREATE INDEX NAME _IDX (first_name, last_name);BCREATE INDEX NAME _IDX (first_name, AND last_name)CCREATE INDEX NAME_IDX ON (First_name, last_name);DCREATE INDEX NAME_IDX ON employees (First_name, AND last_name);ECREATE INDEX NAME_IDX ON employees (First_name, last_name);FCREATE INDEX NAME_IDX FOR employees (First_name, last_name);