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NEW QUESTION: 1
Which of the following are correct about block media recovery? (Choose all that apply.)
A. Logical corruptions are repairable by BMR.
B. Physical corruptions are repairable by BMR.
C. ARCHIVELOG mode is not required if you have both a full and incremental backup for restore.
D. Physical and logical block corruption is recorded automatically in
V$DATABASE_BLOCK_CORRUPTION.
E. RMAN can use any backup for a BMR restore.
Answer: B,D
Explanation:
Explanation/Reference:
Explanation:
Overview of Block Media Recovery (link)
Basic Concepts of Block Media Recovery
Whenever block corruption has been automatically detected, you can perform block media recovery manually with the RECOVER ... BLOCK command. By default, RMAN first searches for good blocks in the real-time query physical standby database, then flashback logs and then blocks in full or level 0 incremental backups.
Identification of Corrupt Blocks
The V$DATABASE_BLOCK_CORRUPTION view displays blocks marked corrupt by database
components such as RMAN, ANALYZE, dbv, and SQL queries. The following types of corruption result in the addition of rows to this view: Physical corruption (sometimes called media corruption) The database does not recognize the block: the checksum is invalid, the block contains all zeros, or the block header is corrupt. Physical corruption checking is enabled by default. You can turn off checksum checking by specifying the NOCHECKSUM option of the BACKUP command, but other physical consistency checks, such as checks of the block headers and footers, cannot be disabled.
The block has a valid checksum, the header and footer match, and so on, but the contents are logically inconsistent. Block media recovery may not be able to repair all logical block corruptions. In these cases, alternate recovery methods, such as tablespace point-in-time recovery, or dropping and re-creating the affected objects, may repair the corruption. Logical corruption checking is disabled by default. You can turn it on by specifying the CHECK LOGICAL option of the BACKUP, RESTORE, RECOVER, and VALIDATE commands.
The database can detect some corruptions by validating relationships between blocks and segments, but cannot detect them by a check of an individual block. The V$DATABASE_BLOCK_CORRUPTION view does not record at this level of granularity.
Prerequisites for Block Media Recovery (link)
The following prerequisites apply to the RECOVER ... BLOCK command:
The target database must run in ARCHIVELOG mode and be open or mounted with a current control
file.
If the target database is a standby database, then it must be in a consistent state, recovery cannot be in
session, and the backup must be older than the corrupted file.
The backups of the data files containing the corrupt blocks must be full or level 0 backups and not
proxy copies.
If only proxy copy backups exist, then you can restore them to a nondefault location on disk, in which case RMAN considers them data file copies and searches them for blocks during block media recovery.
RMAN can use only archived redo logs for the recovery. RMAN cannot use level 1 incremental
backups. Block media recovery cannot survive a missing or inaccessible archived redo log, although it can sometimes survive missing redo records.
Flashback Database must be enabled on the target database for RMAN to search the flashback logs
for good copies of corrupt blocks.
If flashback logging is enabled and contains older, uncorrupted versions of the corrupt blocks, then RMAN can use these blocks, possibly speeding up the recovery. The target database must be associated with a real-time query physical standby database for RMAN to search the database for good copies of corrupt blocks.
NEW QUESTION: 2
In a cable HFC plant, what is a modulator?
A. Local head end
B. Fiber node
C. Diplex filter
D. Set top box
Answer: D
NEW QUESTION: 3
ルーティングテーブルのどのコンポーネントが、好みに応じてルーティングプロトコルをランク付けしますか？
A. ルーティングプロトコルコード
B. ネクストホップ
C. アドミニストレーティブディスタンス
D. メトリック
Answer: C