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多选题Which three are direct benefits of the multiprocess, multithreaded architecture of Oracle Database 12cwhen it is enabled?()AReduced logical I/OBReduced virtual memory utilizationCImproved parallel Execution performanceDImproved Serial Execution performanceEReduced physical I/OFReduced CPU utilization
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多选题What are three purposes of the RMAN “FROM” clause?()Ato support PUSH-based active database duplicationBto support synchronization of a standby database with the primary database in a Data environmentCTo support PULL-based active database duplicationDTo support file restores over the network in a Data Guard environmentETo support file recovery over the network in a Data Guard environment
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多选题Which three statements are true about SQL plan directives?()AThey are tied to a specific statement or SQL id.BThey instruct the maintenance job to collect missing statistics or perform dynamic sampling to generate a more optimal plan.CThey are used to gather only missing statistics.DThey are created for a query expression where statistics are missing or the cardinality estimates by the optimizer are incorrect.EThey instruct the optimizer to create only column group statistics.FImprove plan accuracy by persisting both compilation and execution statistics in the SYSAUX tablespace.
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多选题Which two statements are true about Oracle Managed Files (OMF)?()AOMF cannot be used in a database that already has data files created with user-specified directions.BThe file system directions that are specified by OMF parameters are created automatically.COMF can be used with ASM disk groups, as well as with raw devices, for better file management.DOMF automatically creates unique file names for table spaces and control files.EOMF may affect the location of the redo log files and archived log files.
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多选题Which two statements are true about the Oracle Direct Network File system (DNFS)?()AIt utilizes the OS file system cache.BA traditional NFS mount is not required when using Direct NFS.COracle Disk Manager can manage NFS on its own, without using the operating kernel NFS driver.DDirect NFS is available only in UNIX platforms.EDirect NFS can load-balance I/O traffic across multiple network adapters.
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单选题In your multitenant container database (CDB) containing pluggable database (PDBs), you granted theCREATE TABLE privilege to the common user C # # A_ADMIN in root and all PDBs. You execute thefollowing command from the root container:SQL REVOKE create table FROM C # # A_ADMIN;What is the result?()A
It executes successfully and the CREATE TABLE privilege is revoked from C # # A_ADMIN in root only.B
It fails and reports an error because the CONTAINER=ALL clause is not used.C
It excludes successfully and the CREATE TABLE privilege is revoked from C # # A_ADMIN in root and all PDBs.D
It fails and reports an error because the CONTAINER=CURRENT clause is not used.E
It executes successfully and the CREATE TABLE privilege is revoked from C # # A_ADMIN in all PDBs.
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单选题Examine the parameter for your database instance: You generated the execution plan for the following query in the plan table and noticed that the nested loop join was done. After actual execution of the query, you notice that the hash join was done in the execution plan: Identify the reason why the optimizer chose different execution plans.()A
The optimizer used a dynamic plan for the query.B
The optimizer chose different plans because automatic dynamic sampling was enabled.C
The optimizer used re-optimization cardinality feedback for the query.D
The optimizer chose different plan because extended statistics were created for the columns used.
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多选题Which two partitioned table maintenance operations support asynchronous Global Index Maintenance inOracle database 12c?()AALTER TABLE SPLIT PARTITIONBALTER TABLE MERGE PARTITIONCALTER TABLE TRUNCATE PARTITIONDALTER TABLE ADD PARTITIONEALTER TABLE DROP PARTITIONFALTER TABLE MOVE PARTITION
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多选题You performed an incremental level 0 backup of a database: RMAN BACKUP INCREMENTAL LEVEL 0 DATABASE; To enable block change tracking after the incremental level 0 backup, you issued this command: SQL ALTER DATABASE ENABLE BLOCK CHANGE TRACKING USING FILE ‘ /mydir/rman_change_track.f’; To perform an incremental level 1 cumulative backup, you issued this command: RMAN BACKUP INCREMENTAL LEVEL 1 CUMULATIVE DATABASE; Which three statements are true?()ABackup change tracking will sometimes reduce I/O performed during cumulative incremental backups.BThe change tracking file must always be backed up when you perform a full database backup.CBlock change tracking will always reduce I/O performed during cumulative incremental backups.DMore than one database block may be read by an incremental backup for a change made to a single block.EThe incremental level 1 backup that immediately follows the enabling of block change tracking will not read the change tracking file to discover changed blocks.
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多选题In your Database, the TBS PERCENT USED parameter is set to 60 and the TBS PERCENT FREE parameter is set to 20. Which two storage-tiering actions might be automated when using information Lifecycle Management (ILM) to automate data movement?()AThe movement of all segments to a target tablespace with a higher degree of compression, on a different storage tier, when the source tablespace exceeds TBS PERCENT USEDBSetting the target tablespace to read-onlyCThe movement of some segments to a target tablespace with a higher degree of compression, on a different storage tier, when the source tablespace exceeds TBS PERCENT USEDDSetting the target tablespace offlineEThe movement of some blocks to a target tablespace with a lower degree of compression, on a different storage tier, when the source tablespace exceeds TBS PERCENT USED
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多选题In your Database, the TBS PERCENT USED parameter is set to 60 and the TBS PERCENT FREE parameter is set to 20. Which two storage-tiering actions might be automated when using information Lifecycle Management (ILM) to automate data movement?()AThe movement of all segments to a target tablespace with a higher degree of compression, on a different storage tier, when the source tablespace exceeds TBS PERCENT USEDBSetting the target tablespace to read-onlyCThe movement of some segments to a target tablespace with a higher degree of compression, on a different storage tier, when the source tablespace exceeds TBS PERCENT USEDDSetting the target tablespace offlineEThe movement of some blocks to a target tablespace with a lower degree of compression, on a different storage tier, when the source tablespace exceeds TBS PERCENT USED