Oracle 11G OCP 1Z0-053 52
Check for logical self-consistency of data blocks when modified in memory.
Checksums are calculated before and after the block change.
Checks are performed for the lost writes to the physical standby database.
Which method would help you perform the above checks automatically?
A. Set the DB_SECUREFILE parameter to PERMITTED.
B. Set the DB_ULTRA_SAFE parameter to DATA_ONLY.
C. Set the DB_LOCK_CHECKSUM parameter to TYPICAL.
D. Set the DB_LOST_WRITE_PROTECT parameter to TYPICAL.
答案:(B)
解析:
該引數設定其它引數的預設值來控制保護的級別
DB_ULTRA_SAFE = {OFF | DATA_ONLY | DATA_AND_INDEX}
1. OFF,當DB_BLOCK_CHECKING, DB_BLOCK_CHECKSUM, DB_LOST_WRITE_PROTECT任何一個被顯示設定時,不會有任何改變.
2. DATA_ONLY
DB_BLOCK_CHECKING = MEDIUM
DB_BLOCK_CHECKSUM = FULL
DB_LOST_WRITE_PROTECT = TYPICAL
3. DATA_AND_INDEX
DB_BLOCK_CHECING = FULL
DB_BLOCK_CHECKSUM = FULL
DB_LOST_WRITE_PROTECT = TYPICAL
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