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多选题
Which statements are true about checkpointing（）
A
The checkpoint frequency decreases with the smaller redo log file size.
B
It ensures that all committed data is written to the data files during normal shutdown.
C
The frequent full checkpoint in a database can cause the overall degradation of the database performance.
D
It prompts the Checkpoint （CKPT） process to write data to the data files and redo information to the onlineredo log files
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更多 “多选题Which statements are true about checkpointing（）AThe checkpoint frequency decreases with the smaller redo log file size.BIt ensures that all committed data is written to the data files during normal shutdown.CThe frequent full checkpoint in a database can cause the overall degradation of the database performance.DIt prompts the Checkpoint （CKPT） process to write data to the data files and redo information to the onlineredo log files” 相关考题
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Examine the following scenario:The target database instance is running. The most recent backup available for the target database was taken two days ago. Log files switches have occurred in last two days. The target database is duplicated on the same host, using the Recovery Manager (RMAN) duplicate command as follows:Which statement is true about the duplicate database in this scenario?（）A. It contains data till the last backupB. It contains all data from target database until the current timeC. It contains all data from only the committed transactions in the target databaseD. It contains all data except that which is used by the transactions in the current online redo file of target database
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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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Which statements are true about checkpointing（）A、The checkpoint frequency decreases with the smaller redo log file size.B、It ensures that all committed data is written to the data files during normal shutdown.C、The frequent full checkpoint in a database can cause the overall degradation of the database performance.D、It prompts the Checkpoint （CKPT） process to write data to the data files and redo information to the onlineredo log files
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After performing a clean shut down of the database instance for maintenance， you mount the database andthen execute a command to open the database：SQL ALTER DATABASE OPEN； Which two statements are true（）A、The online redo log files and online data files are opened.B、All the online data file headers are checked for consistency.C、Instance recovery is performed before opening the database.D、The path and existence of all the log file members are checked
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After performing a clean shut down of the database instance for maintenance， you mount thedatabase and then execute a command to open the database： SQL ALTER DATABASE OPEN； Which two statements are true（）A、The online redo log files and online data files are opened.B、All the online data file headers are checked for consistency.C、Instance recovery is performed before opening the database.D、The path and existence of all the log file members are checked
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You performed the RMAN database backup with the KEEP option.Which two statements are true about this backup?（） (Choose two)A、The KEEP option overrides the configured retention policyB、The KEEP option is an attribute of an individual backup pieceC、The backup contains only data files and archived redo log filesD、The backup contains data files, the server parameter file and the control file even if the control file auto backup is disabled
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Which two statements are true about checkpointing（）A、The checkpoint frequency decreases with the smaller redo log file size.B、It ensures that all committed data is written to the data files during normal shutdown.C、The frequent full checkpoint in a database can cause the overall degradation of the database performance.D、It prompts the Checkpoint （CKPT） process to write data to the data files and redo information to the online redo log files.
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Which three statements are true about the stages of database startup？（）A、Data files and redo log files can be renamed at the MOUNT stage.B、Control files are read at the OPEN stage for the location of data files.C、Control files are required to bring the database to the NOMOUNT stage.D、Data files and redo log files are made available to users at the OPEN stage.E、Data files and online redo log files are checked for consistency while opening the database
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The instance abnormally terminates because of a power outage. Which statement is true about redolog files during instance recovery（）A、Inactive and current redo log files are required to accomplish recovery.B、Online and archived redo log files are required to accomplish instance recovery.C、All redo log entries after the last checkpoint are applied from redo log files to data files.D、All redo log entries recorded in the current redo log file until the checkpoint position are applied to datafiles.
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Which two statements about the background process of the database writer are true（）A、It is possible to have multiple database writers in an Oracle instance.B、It writes dirty buffers， if any， to data files whenever a checkpoint occurs.C、It writes dirty buffers， if any， to data files whenever a transaction commits.D、It writes dirty buffers， if any， to data files before the log writer （LGWR） writes
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Your database performance has degraded due to frequent checkpointing. What would you do in this scenario？（）A、make redo log files smallerB、increase the size of the checkpoint fileC、make the changes as per the advice given by MTTR AdvisorD、make the changes as per the advice given by Checkpoint Advisor
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Which two statements about the background process of thedatabase writerare true（） A、It is possible to have multiple database writers in an Oracle instance.B、It writes dirty buffers， if any， to data files whenever a checkpoint occurs.C、It writes dirty buffers， if any， to data files whenever a transaction commits.D、It writes dirty buffers， if any， to data files before the log writer （LGWR） writes.
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Which statement is true regarding checkpoints and recovery？（）A、A checkpoint defines the highest system change number （SCN）.B、All redo entries higher or at the SCN are known to be written to the data files.C、Only the redo records containing SCNs higher then the checkpoint need to be applied during recovery.D、The LOG_CHECKPOINT_INTERVAL initialization parameter specifies the amount of time between incremental checkpoints.
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Which three statements are true about database recovery operations？（）A、Damaged or lost data files are restored from backups.B、Redo log file entries are used to roll forward the database.C、Undo segments are used to roll back any uncommitted transactions.D、Transactions that were active when the failure occurred are restarted.E、Transactions that were active when the failure occurred are automatically committed during the recover procedure.
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单选题The instance abnormally terminates because of a power outage. Which statement is true about redolog files during instance recovery（）A
Inactive and current redo log files are required to accomplish recovery.B
Online and archived redo log files are required to accomplish instance recovery.C
All redo log entries after the last checkpoint are applied from redo log files to data files.D
All redo log entries recorded in the current redo log file until the checkpoint position are applied to datafiles.
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多选题After performing a clean shut down of the database instance for maintenance， you mount the database andthen execute a command to open the database：SQL ALTER DATABASE OPEN； Which two statements are true（）AThe online redo log files and online data files are opened.BAll the online data file headers are checked for consistency.CInstance recovery is performed before opening the database.DThe path and existence of all the log file members are checked
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单选题In the instance of the PROD database， the checkpoint （CKPT） process runs after every minute. A database user updates the rows of the ORDERS table. Because of the configuration， the CKPT process gets initiated before the user commits the transaction. What would happen to the modified blocks when the CKPT process is started？（）A
The modified blocks would be written to the data files.B
The modified blocks would be written to the temp files.C
The modified blocks would be written to the control file.D
The modified blocks would be written to the redo log files.E
The modified blocks would be written to the archived redo log files.F
The modified blocks would be retained in the database buffer cache.
考题
单选题Which statement is true regarding checkpoints and recovery？（）A
A checkpoint defines the highest system change number （SCN）.B
All redo entries higher or at the SCN are known to be written to the data files.C
Only the redo records containing SCNs higher then the checkpoint need to be applied during recovery.D
The LOG_CHECKPOINT_INTERVAL initialization parameter specifies the amount of time between incremental checkpoints.
考题
多选题Which two statements about the background process of the database writer are true（）AIt is possible to have multiple database writers in an Oracle instance.BIt writes dirty buffers， if any， to data files whenever a checkpoint occurs.CIt writes dirty buffers， if any， to data files whenever a transaction commits.DIt writes dirty buffers， if any， to data files before the log writer （LGWR） writes
考题
多选题Which statements are true about checkpointing（）AThe checkpoint frequency decreases with the smaller redo log file size.BIt ensures that all committed data is written to the data files during normal shutdown.CThe frequent full checkpoint in a database can cause the overall degradation of the database performance.DIt prompts the Checkpoint （CKPT） process to write data to the data files and redo information to the onlineredo log files
考题
多选题Which three statements are true about the stages of database startup？（）AData files and redo log files can be renamed at the MOUNT stage.BControl files are read at the OPEN stage for the location of data files.CControl files are required to bring the database to the NOMOUNT stage.DData files and redo log files are made available to users at the OPEN stage.EData files and online redo log files are checked for consistency while opening the database
考题
单选题The instance abnormally terminates because of a power outage. Which statement is true about redo log filesduring instance recovery（）A
Inactive and current redo log files are required to accomplish recovery.B
Online and archived redo log files are required to accomplish instance recovery.C
All redo log entries after the last checkpoint are applied from redo log files to data files.D
All redo log entries recorded in the current redo log file until the checkpoint position are applied to data files
考题
多选题Which two statements are true about checkpointing（）AThe checkpoint frequency decreases with the smaller redo log file size.BIt ensures that all committed data is written to the data files during normal shutdown.CThe frequent full checkpoint in a database can cause the overall degradation of the database performance.DIt prompts the Checkpoint （CKPT） process to write data to the data files and redo information to the online redo log files.
考题
多选题You performed the RMAN database backup with the KEEP option.Which two statements are true about this backup?（） (Choose two)AThe KEEP option overrides the configured retention policyBThe KEEP option is an attribute of an individual backup pieceCThe backup contains only data files and archived redo log filesDThe backup contains data files, the server parameter file and the control file even if the control file auto backup is disabled
考题
多选题Which two statements about the background process of thedatabase writerare true（）AIt is possible to have multiple database writers in an Oracle instance.BIt writes dirty buffers， if any， to data files whenever a checkpoint occurs.CIt writes dirty buffers， if any， to data files whenever a transaction commits.DIt writes dirty buffers， if any， to data files before the log writer （LGWR） writes.
考题
多选题After performing a clean shut down of the database instance for maintenance， you mount thedatabase and then execute a command to open the database： SQL ALTER DATABASE OPEN； Which two statements are true（）AThe online redo log files and online data files are opened.BAll the online data file headers are checked for consistency.CInstance recovery is performed before opening the database.DThe path and existence of all the log file members are checked
考题
单选题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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