[单选]

You performed the RMAN database backup having a backupset key number 231 with the KEEP FOREVER option. After some days, you want to change the status of the database backup and you issued the following command:
RMAN>CHANGE BACKUPSET 231 NOKEEP;
What is the implication of this command?（）

请简述变桨系统的功能. You want to configure the Flashback Database feature and retain flashback logs for three days.  Presently the database is open and configured in ARCHIVELOG mode. The following steps must be performed in the correct sequence to do this：   1. Set the retention target：  SQL> ALTER SYSTEM SET DB_FLASHBACK_RETENTION_TARGET=4320；  2. Enable Flashback Database：  SQL> ALTER DATABASE FLASHBACK ON；  3. Mount the database：  SQL> STARTUP MOUNT EXCLUSIVE  4. Shutdown the instance： SQL> SHUTDOWN IMMEDIATE  5. Open the database：  SQL> ALTER DATABASE OPEN；   Choose the correct sequence.（）  4， 1， 3， 2， 5。  4， 3， 1， 2， 5。  2， 4， 3， 5， 1。  4， 2， 5， 3， 1。 在普通型人寿保险中，储蓄性极强的险种是（） 终身寿险。 定期寿险。 生存保险。 两全保险。 Which of the following commands should be used to monitor the number of bytes read on any given disk？（）  tprof。  topas。  filemon。  vmstat。 An  administrator  performs  an  audit  on  the  /usr  filesystem  and  finds  the  following  permissions：  -rwsr-xr-x  1  root  sys  514288  Jun  18  09：40  /usr/local/bin/nmon  Which  of  the  following  methods  can  the  administrator use to remove a potential security risk（） rm /usr/local/bin/nmon。 chmod u-s /usr/local/bin/nmon。 Reinstall the file from the appropriate fileset。 chmod go-rx /usr/local/bin/nmo。

You performed the RMAN database backup having a backupset key number 231 with the KEEP FOREVER option. After some days, you want to change the status of the database backup and you issued the following command:
RMAN>CHANGE BACKUPSET 231 NOKEEP;
What is the implication of this command?（）