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You have configured flash recovery area in your database and you set the following Initialization parameters for your database instance：  
LOG_ARCHIVE_DEST 1 = ，，LOCATION=/disk1/arch MANDATORY’ 
LOG _ARCHIEVE_DEST 2 = ，，LOCATION=/disk2/arch’
LOG_ARCHIVK_DEST_3 = ，，LOCATION=/diSk3/arch 
LOG_ARCH1VK_DEST_4 = ’ LOCATION=/disk4/arch’ 
LOG_ARCHIVE_MIN-SUCCEED_DEST = 2  
While the database instance is functional，you realized that the destination set by the 
LOG_ARCHIVE_DEST_I parameter Is not available for the archived redo log file to be created in. All redo log groups have been used. 
What happens in an event of log switch？（）  

While designing your database， you have created the EMPLOYEES table as an index­organized table （IOT）. You want to create a bitmap index on the JOB_ID column to make queries faster. Which task must have been completed so that you are able to create the bitmap index？（） A primary key must have been created.。 A mapping table must have been created.。 An overflow tablespace must have been specified.。 The PCTTHRESHOLD option must have been specified.。 王威《走进心灵，师爱无痕》提出：我们的教育是面向全体的教育，是对天下学子（）的关怀，是因材施教的智慧和胸襟。 A Microsoft Exchange mobile messaging solution uses Microsoft Windows Mobile 5.0 with  Microsoft Messaging and Security Feature Pack. You deploy the solution by using front-end and back-end servers. Microsoft Exchange Server 2003 Service Pack 2 is installed on the front-end server.   You need to use the remote wipe feature.   What should you do？（） Install Microsoft Windows Server 2003 Service Pack 2 on all domain controllers. 。 Install Microsoft Exchange Server 2003 Service Pack 2 on the back-end server. 。 Install Microsoft Exchange Server ActiveSync Web Administration Tool on the front-end server.。 Install Microsoft Exchange Server ActiveSync Web Administration Tool on the back-end server.Reset Instructions Calculator.&e。 You are working on a CATDB database that contains an Oracle Database version 11.1 catalog schema owned by the user RCO11. The INST1 database contains an Oracle Database version 10.1 catalog schema owned by the user RCAT10. You want the RMAN to import metadata for database IDs 1423241 and 1423242, registered in RCAT10, into the recovery catalog owned by RCO11. You executed the following RMAN commands: RMAN> CONNECT CATALOG rco11/password@catdb RMAN> IMPORT CATALOG rcat10/oracle@inst1; What happens when you execute the above commands?（） They deregister all databases registered in the RCAT10 catalog.。 They import metadata for all registered databases in the RCAT10 database.。 They register all the RCAT10-catalog registered databases in the RCO11 catalog.。 They overwrite all stored scripts in the RCO11 catalog with the same name as that in the RCAT10 catalog.。 设备从开始使用到报废为止经过的时间是设备的（）。 物质寿命。 经济寿命。 技术寿命。 折旧寿命。

You have configured flash recovery area in your database and you set the following Initialization parameters for your database instance：  
LOG_ARCHIVE_DEST 1 = ，，LOCATION=/disk1/arch MANDATORY’ 
LOG _ARCHIEVE_DEST 2 = ，，LOCATION=/disk2/arch’
LOG_ARCHIVK_DEST_3 = ，，LOCATION=/diSk3/arch 
LOG_ARCH1VK_DEST_4 = ’ LOCATION=/disk4/arch’ 
LOG_ARCHIVE_MIN-SUCCEED_DEST = 2  
While the database instance is functional，you realized that the destination set by the 
LOG_ARCHIVE_DEST_I parameter Is not available for the archived redo log file to be created in. All redo log groups have been used. 
What happens in an event of log switch？（）