单选题What purpose would you achieve by enabling the block change tracking feature？（）A Eliminate the necessity for backups.B Perform optimized image copy backups.C Perform optimized incremental backups.D Enable checkpoint （CKPT） to perform checkpointing at every block change.E Enable database writer （DBWn） to write changed blocks to data files faster.
单选题
What purpose would you achieve by enabling the block change tracking feature？（）
A
Eliminate the necessity for backups.
B
Perform optimized image copy backups.
C
Perform optimized incremental backups.
D
Enable checkpoint （CKPT） to perform checkpointing at every block change.
E
Enable database writer （DBWn） to write changed blocks to data files faster.
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单选题The datafiles of your database are ASM files. You are performing a check for datafile block corruption by using the DBVERIFY utility. What is a prerequisite for checking block corruption on an ASM datafile by using the DBVERIFY utility？（）A The block change tracking feature must be enabled.B OMF must be configured on your database.C The database must be in ARCHIVELOG mode.D A USERID must be supplied.