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You can control instance recover performance by setting parameters to define targets for（）
- A、The size of the redo buffer in SGA.
- B、The instance that will perform recovery in Real Application Cluster database.
- C、The number of blocks to be read during instance recovery, or the time needed to complete instance recovery.
- D、The number of passes through the redo logs made by the recovery process to identify blocks needing recovery.
参考答案
更多 “You can control instance recover performance by setting parameters to define targets for（）A、The size of the redo buffer in SGA. B、The instance that will perform recovery in Real Application Cluster database. C、The number of blocks to be read during instance recovery, or the time needed to complete instance recovery. D、The number of passes through the redo logs made by the recovery process to identify blocks needing recovery.” 相关考题
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Which statement is true regarding the Archiver （ARCn） process，archived log files，and recovery？ （）A、A database backup, combined with archived redo log files, guarantees that all committed data can be recovered to the point of failure. B、During recovery the ARCn background process copies its redo entries identified for recovery by the control file to the data files. C、After each write to an archived log, the mandatory background process ARCn writes its log sequence number and the first and last SCN number within the log sequence to the control file. D、At database recover time, and archived redo log is uniquely identified for recovery use by its redo thread number and destination ID number retrieved from the control file.
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The database is running in the ARCHIVELOG mode. It has three redo log groups with one member each. One of the redo log groups has become corrupted. You have issued the following command during the recovery of a damaged redo log file： ALTER DATABASE CLEAR UNARCHIVED LOGFILE GROUP 3； Which action should you perform immediately after using this command？（） A、 You should perform a log switchB、 You should make a backup of the databaseC、 You should switch the database to the NONARCHIVELOG modeD、 You should shut down the database instance and perform a complete database recovery
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Automatic Shared Memory Management （ASMM） has been enabled for your database instance. Theinitialization parameters for the components that are managed by ASMM are not set. After observing theeffects of ASSM， you executed the following command： SQL ALTER SYSTEM SET DB_CACHE_SIZE = 100M； Which statement is true in this scenario（）A、The minimum memory size for the database buffer cache is set to 100 mb.B、The maximum memory size that can be obtained by the database buffer cache during ASMM is set to100 mbC、The minimum memory size allocated for a server process in the database buffer cache in dedicatedmode is set to 100 mb.D、The maximum memory size from the database buffer cache that can be released for dynamicdistribution during ASMM is set to 100 mb
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You want to use the automatic management of backup and recovery operations features for your database. Which configuration must you set？（）A、 Enable the flash recovery area and specify it as the archived redo log destination.B、 Disable the flash recovery area and start the database instance in ARCHIVELOG mode.C、 Enable the flash recovery area but do not specify it as the archived redo log destination. D、 Disable the flash recovery area and start the database instance in NOARCHIVELOG mode.
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Media recovery can sometimes be stopped by the inability to read past a certain point in the redo stream. This is often referred to as “stuck recovery”. Before Oracle9i， the Database Administrator had few options to deal with stuck recovery. If the corrupt redo could not be recovered from some other source， then all transactions that committed after the corrupt point in the redo steam would be lost. Oracle9i changes that with the Trial Recovery feature. Trial Recover is used to test the application of the redo logs to the database. What are three other characteristics of Trial Recovery（）A、Speeds up subsequent media recover actions.B、Writes any uncorrupted block to disk during the test recovery.C、Can be invoked by adding the TEST option to any RECOVER command.D、Allows the Administrator to determine how many blocks are affected by corruption.E、Marks blocks as corrupt in memory， allowing the test recover to proceed to completion.
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You are using an Automatic Storage Management （ASM） instance to manage the files of your production database. While studying the parameter file of the ASM instance， you find the following entry： ASM_DISKSTRING = /devices/* What could be the reason for this setting？（）A、to enable the ASM instance to identify the alert log fileB、to enable the ASM instance to identify the server parameter fileC、to enable the ASM instance to define the locations for Oracle Managed Files （OMF）D、to enable the ASM instance to identify all disks that can be accessed by it in the /devices directory
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Immediately after adding a new disk to or removing an existing disk from an Automatic Storage Management （ASM） instance， you find that the performance of the database decreases initially， until the addition or removal process is completed. Performance then gradually returns to normal levels. Which two activities could you perform to maintain a consistent performance of the database while adding or removing disks？（）A、 increase the number of checkpoint processesB、 define the POWER option while adding or removing the disksC、 increase the number of DBWR processes by setting up a higher value for DB_WRITER_PROCESSESD、 increase the number of slave database writer processes by setting up a higher value for DBWR_IO_SLAVESE、 increase the number of ASM Rebalance processes by setting up a higher value for ASM_POWER_LIMIT during the disk addition or removal
考题
What is true regarding a shared， server-side parameter file for a Real Application Cluster database？ （）A、It can contain parameters with distinct values for each distance.B、It can contain only parameters with identical values for each instance.C、It must contain an IFILE parameter for each instance’s individual parameter file.D、It must be located in the default location for the primary instance’s parameter file.
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You work as a database administrator for Certkiller .com. Users in the Certkiller PROD database complain about the slow response when accessing the database. In the Active Session Waiting： Configuration page you find that the majority of the wait time is for the redo log buffer.Further investigation using the Run Queue graph and operating system tools reveals that the redo log files are on the same disks， and that the disk I/O for the redo log files is the reason for the performance degradation. Which two actions would you take to gain performance？（）A、Increase the size of redo log filesB、Increase the size of redo log bufferC、Increase the number of redo log filesD、Place the redo log files on a separate diskE、Decrease the number of redo log groups to twoF、Increate the number Log Writer （LGWR） process
考题
You work as a database administrator for Supportcenter.cn. You added atablespaceto your database. Because of the changes to the physical structure of your database， you performed a backup of the control file to trace. After this， you lost only the control files and the instance aborted due to a hardware failure. How would you proceed to recover the database？（）A、Start the instance and open the database， instance recovery automatically recoverscontrol filesB、Create a file based on the contents of the trace file and save it to the control file locations and start the databaseC、Re-create the database （The recovery of the control file is not possible because you have lost all the control files.）D、Start the instance， in the NOMOUNTstate，re-create the control file using the CREATE CONTROLFILE command stored in the trace file.E、Start the instance and MOUNT the database， then re-create the control file using the CREATE CONTROLFILE command stored in the trace file.
考题
Why can setting too low a value for the FAST_START_MTTR_TARGET parameter reduce your overall database performance？（）A、Data blocks have to be written more frequently by DBWR. B、Redo blocks have to be written more frequently by LGWR. C、You need to substantially increase the size of your database buffer cache to hold the additional checkpoint records. D、You need to substantially increase the size of your redo buffer cache to hold the additional checkpoint records.
考题
You are working on a test database where instance recovery takes a considerable amount of time.How can reduce the recovery time？（）A、By multiplexing the control filesB、By multiplexing the redo log filesC、By decreasing the size of redo log filesD、By configuring mean time to recover （MTTR） to a lower valueE、By setting the UNDO_RETENTION parameter to a higher value
考题
In the parameter file of your production database， the FAST_START_MTTR_TARGET parameter is set to 300 to optimize instance recovery. While observing the performance of the database during instance recovery， you find that the redo log files are not sized properly to support this activity. Which two sources could you use to determine the optimal size of the redo log files？（）A、the V$LOG viewB、the V$DBFILE viewC、the V$LOGFILE viewD、the V$INSTANCE_RECOVERY viewE、Oracle Enterprise Manager Database Control
考题
You are maintaining your database in Oracle10g. You have set the value of the STATISTICS_LEVEL initialization parameter to TYPICAL and the value of the FAST_START_MTTR_TARGET parameter to 900 seconds. To increase the performance of the database， you want to determine the log file size that should equal the minimum size of all the online redo log files. Which column will enable you to perform the desired task？（）A、 the WRITES_LOGFILE_SIZE column of the V$INSTANCE_RECOVERY viewB、 the column of the V$INSTANCE_RECOVERY viewC、 the OPTIMAL_LOGFILE_SIZE column of the V$INSTANCE_RECOVERY viewD、 the LOG_FILE_SIZE_REDO_BLKS column of the V$INSTANCE_RECOVERY view
考题
You lost the PRODSTD tablespace， which was read/write. The tablespace was read/x7fonly when the last backup was performed. How would you recover the tablespace？（）A、restore the tablespace from the backup; there is no need to apply the redo information B、restore the full database to recover the data up to the point when you performed the backup C、restore the tablespace from the backup， and then perform a recovery using the backup control fileD、restore the tablespace from the backup， and then recover the tablespace; all the redo information from the point when the tablespace was made read/write is applied
考题
You work as a database administrator for Certkiller .com. You added atablespaceto your database. Because of the changes to the physical structure of your database， you performed a backup of the control file to trace. After this， you lost only the control files and the instance aborted due to a hardware failure. How would you proceed to recover the database？（）A、Start the instance and open the database, instance recovery automatically recovers control files B、Create a file based on the contents of the trace file and save it to the control file locations and start the database C、Re-create the database (The recovery of the control file is not possible because you have lost all the control files.) D、Start the instance, in the NOMOUNTstate,re-create the control file using the CREATE CONTROLFILE command stored in the trace file. E、Start the instance and MOUNT the database, then re-create the control file using the CREATE CONTROLFILE command stored in the trace file.
考题
You lost the PRODSTD tablespace， which was read/write. The tablespace was read-only when the last backup was performed. How would you recover the tablespace？（）A、 restore the tablespace from the backup； there is no need to apply the redo informationB、 restore the full database to recover the data up to the point when you performed the backupC、 restore the tablespace from the backup and then perform a recovery using the backup control fileD、 restore the tablespace from the backup and then recover the tablespace； all the redo information from the point when the tablespace was made read/write is applied
考题
You work in a company which uses SQL Server 2008. You are the administrator of the company database. Now you are in charge of a SQL Server 2008 instance which is named Instance01. Instance01 contains a database which is named Dworks. The bulk-logged recovery mode is used by the Dworks database. You log ship the Dworks database through a WAN link. A scheduled job rebuilds the indexes of the Dworks database. You find that the size of the log backups for log shipping has been enlarged by the job. Now you have to reduce the size of the log backup. So what action should you perform to achieve this goal？（） A、You should recreate the indexes. B、You should compress the log file backups C、You should make the Dworks database use the Full recovery mode D、You should make the Dworks database use the Simple recovery mode.
考题
多选题You are working on a test database where instance recovery takes a considerable amount of time.How can reduce the recovery time？（）ABy multiplexing the control filesBBy multiplexing the redo log filesCBy decreasing the size of redo log filesDBy configuring mean time to recover （MTTR） to a lower valueEBy setting the UNDO_RETENTION parameter to a higher value
考题
单选题You work as a database administrator for Supportcenter.cn. You started the instance using theinit.orafile. You have two control files and three redo log groups in your database. You decided to protect the database against failures by adding one more control file. Which file is the appropriate way to perform this task？（）A
Shut down the instance， copy the control file to the third location and open the database.B
Abort the instance， copy the control file to the third location， modify the CONTROL_FILES parameter in theinit.orafile and open the database.C
Copy the control file to the third location， modify the CONTROL_FILES parameter in theinit.orafile， restart the instance and open the database.D
Shut down the instance， copy the control file to the third location， modify the CONTROL_FILES parameter in theinit.orafile and open the database.E
Shut down the instance， startup in the mount state， copy the control file to the third location， modify the CONTROL_FILES parameter ininit.oraand open the database.
考题
单选题You can control instance recover performance by setting parameters to define targets for（）A
The size of the redo buffer in SGA. B
The instance that will perform recovery in Real Application Cluster database. C
The number of blocks to be read during instance recovery, or the time needed to complete instance recovery. D
The number of passes through the redo logs made by the recovery process to identify blocks needing recovery.
考题
单选题What is true regarding a shared， server-side parameter file for a Real Application Cluster database？ （）A
It can contain parameters with distinct values for each distance.B
It can contain only parameters with identical values for each instance.C
It must contain an IFILE parameter for each instance’s individual parameter file.D
It must be located in the default location for the primary instance’s parameter file.
考题
多选题Media recovery can sometimes be stopped by the inability to read past a certain point in the redo stream. This is often referred to as “stuck recovery”. Before Oracle9i， the Database Administrator had few options to deal with stuck recovery. If the corrupt redo could not be recovered from some other source， then all transactions that committed after the corrupt point in the redo steam would be lost. Oracle9i changes that with the Trial Recovery feature. Trial Recover is used to test the application of the redo logs to the database. What are three other characteristics of Trial Recovery（）ASpeeds up subsequent media recover actions.BWrites any uncorrupted block to disk during the test recovery.CCan be invoked by adding the TEST option to any RECOVER command.DAllows the Administrator to determine how many blocks are affected by corruption.EMarks blocks as corrupt in memory， allowing the test recover to proceed to completion.
考题
单选题You are using an Automatic Storage Management （ASM） instance to manage the files of your production database. While studying the parameter file of the ASM instance， you find the following entry： ASM_DISKSTRING = /devices/* What could be the reason for this setting？（）A
to enable the ASM instance to identify the alert log fileB
to enable the ASM instance to identify the server parameter fileC
to enable the ASM instance to define the locations for Oracle Managed Files （OMF）D
to enable the ASM instance to identify all disks that can be accessed by it in the /devices directory
考题
单选题You work as a database administrator for Certkiller .com. You added atablespaceto your database. Because of the changes to the physical structure of your database， you performed a backup of the control file to trace. After this， you lost only the control files and the instance aborted due to a hardware failure. How would you proceed to recover the database？（）A
Start the instance and open the database, instance recovery automatically recovers control files B
Create a file based on the contents of the trace file and save it to the control file locations and start the database C
Re-create the database (The recovery of the control file is not possible because you have lost all the control files.) D
Start the instance, in the NOMOUNTstate,re-create the control file using the CREATE CONTROLFILE command stored in the trace file. E
Start the instance and MOUNT the database, then re-create the control file using the CREATE CONTROLFILE command stored in the trace file.
考题
单选题Automatic Shared Memory Management （ASMM） has been enabled for your database instance. Theinitialization parameters for the components that are managed by ASMM are not set. After observing theeffects of ASSM， you executed the following command： SQL ALTER SYSTEM SET DB_CACHE_SIZE = 100M； Which statement is true in this scenario（）A
The minimum memory size for the database buffer cache is set to 100 mb.B
The maximum memory size that can be obtained by the database buffer cache during ASMM is set to100 mbC
The minimum memory size allocated for a server process in the database buffer cache in dedicatedmode is set to 100 mb.D
The maximum memory size from the database buffer cache that can be released for dynamicdistribution during ASMM is set to 100 mb
考题
多选题In the parameter file of your production database， the FAST_START_MTTR_TARGET parameter is set to 300 to optimize instance recovery. While observing the performance of the database during instance recovery， you find that the redo log files are not sized properly to support this activity. Which two sources could you use to determine the optimal size of the redo log files？（）Athe V$LOG viewBthe V$DBFILE viewCthe V$LOGFILE viewDthe V$INSTANCE_RECOVERY viewEOracle Enterprise Manager Database Control
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