156、
156.What is the effect of increasing the value of the ASM_POWER_LIMIT parameter? A. The number of DBWR processes increases B. The number of ASMB processes increases C. The number of DBWR_TO_SLAVES increases D. The rebalancing operation in an ASM instance completes more quickly, but can result in higher I/O overhead
Answer: D The ASM_POWER_LIMITinitialization parameter specifies the default power for disk rebalancing in a disk group. The range of values is 0to 1024. The default value is 1. A value of 0disables rebalancing. Higher numeric values enable the rebalancing operation to complete more quickly, but might result in higher I/O overhead and more rebalancing processes.
157、
157.The DB_BLOCK_CHECKING initialization parameter is set to OFF. Which block checking would be performed? A. The Oracle database will perform block checking for the index blocks only B. The Oracle database will not perform block checking for any of the data blocks C. The Oracle database will perform block checking for the default permanent tablespace only D. The Oracle database will perform block checking for the data blocks in all user tablespaces E. The Oracle database will perform block checking for the data blocks in the SYSTEM tablespace only
Answer: E DB_BLOCK_CHECKING OFF or FALSE No block checking is performed for blocks in user tablespaces. However, semantic block checking for SYSTEMtablespace blocks isalways turned on.
158、
158.You create two resource plans, one for data warehouse loading jobs at night and the other for application jobs at day time. You want the resource plans to activate automatically so that the resource allocation is optimum as desired by the activity. How would you achieve this? A. Implement job classes B. Implement Scheduler windows C. Implement the mapping rule for the consumer groups D. Set the SWITCH_TIME resource plan directive for both the resource plans
Answer: B
159、
159.Which package provides API's for the SQL Tuning Advisor? A. DBMS_MONITOR B. DBMS_STATS C. DBMS_SQLTUNE D. DBMS_ADVISOR
Answer: C
160、
160.Which two statements are true about the duplexing of the backups taken by RMAN? (Choose two.) A. It's only supported for the backups performed on the tape B. It is not supported for backup operations that produce image copies C. Duplex backups need a parallelism for the device to be equal to number of copies D. Duplex backups can be performed to either disk or tape, but cannot be performed on tape and disk simultaneously
Answer: BD oracle多重备份 官方文档： You can use the CONFIGURE ... BACKUP COPIEScommand to specify how many copies of each backup piece should be created on the specified device type for the specified type of file. This type of backup is known as a duplexed backup set. The CONFIGURE settings for duplexing only affect backups of data files, control files, and archived logs into backup sets, and do not affect image copies. RMAN can duplex backups to either disk or tape, but cannot duplex backups to tape and disk simultaneously. When backing up totape, ensure that the number of copies does not exceed the number of available tape devices.