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
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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单选题Which statement is true regarding checkpoints and recovery？（）AA checkpoint defines the highest system change number （SCN）.BAll redo entries higher or at the SCN are known to be written to the data files.COnly the redo records containing SCNs higher then the checkpoint need to be applied during recovery.DThe LOG_CHECKPOINT_INTERVAL initialization parameter specifies the amount of time between incremental checkpoints.
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
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
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
单选题The instance abnormally terminates because of a power outage. Which statement is true about redo log filesduring instance recovery（）AInactive and current redo log files are required to accomplish recovery.BOnline and archived redo log files are required to accomplish instance recovery.CAll redo log entries after the last checkpoint are applied from redo log files to data files.DAll redo log entries recorded in the current redo log file until the checkpoint position are applied to data files
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.
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
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.
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
单选题Which statement is true regarding the Archiver （ARCn） process，archived log files，and recovery？ （）AA database backup, combined with archived redo log files, guarantees that all committed data can be recovered to the point of failure. BDuring recovery the ARCn background process copies its redo entries identified for recovery by the control file to the data files. CAfter 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. DAt 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.