【单选题】Choose the phrase that is closest in meaning to the underlined part. A frame header is attached which contains information required to synchronize to and decode the encoded bit stream .
A.
necessary in synchronization, decoding, and encoding of the data bits
B.
required for the synchronization between the decoded and encoded bit stream
C.
needed to synchronize to the decoded data stream
D.
necessary for the encoded data stream to be synchronized and decoded
【多选题】The database Is configured in ARCHIVELOG mode. The database needs to be up 24 X 7. You want to perform user managed backup for the data files of the HR_DATA tablespace.To accomplish the task, you issu...
A.
No transaction on the tablespace is allowed but you can perform queries.
B.
The tablespace will automatically come out of backup mode when the file copy is complete.
C.
The checkpoint change number is frozen in headers of the data files until the file is removed from backup mode.
D.
The database writes the before image of an entire block to the redo stream before modifying. block tor the first time.