In a recent Automatic Workload Repository (AWR) report for your database, you notice a high number of buffer busy waits. The database consists of locally managed tablespaces with free list managed segments.On further investigation, you find that buffer busy waits is caused by contention on data blocks.Which option would you consider first to decrease the wait event immediately、

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• 1The following parameter are set for your Oracle 12c database instance:OPTIMIZER_CAPTURE_SQL_PLAN_BASELINES=FALSEOPTIMIZER_USE_SQL_PLAN_BASELINES=TRUEYou want to manage the SQL plan evolution task manually. Examine the following steps:1. Set the evolve task parameters.2. Create the evolve task by using the DBMS_SPM.CREATE_EVOLVE_TASK function.3. Implement the recommendations in the task by using theDBMS_SPM.IMPLEMENT_EVOLVE_TASK function.4. Execute the evolve task by using the DBMS_SPM.EXECUTE_EVOLVE_TASK function.5. Report the task outcome by using the DBMS_SPM.REPORT_EVOLVE_TASK function.Identify the correct sequence of steps:

  A.2, 4, 5

  B.2, 1, 4, 3, 5

  C.1, 2, 3, 4, 5

  D.1, 2, 4, 5

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• 2Your database supports a DSS workload that involves the execution of complex queries: Currently, the library cache contains the ideal workload for analysis. You want to analyze some of the queries for an application that are cached in the library cache.What must you do to receive recommendations about the efficient use of indexes and materialized views to improve query performance、

  A.Create a SQL Tuning Set (STS) that contains the queries cached in the library cache and run the SQL Tuning Advisor (STA) on the workload captured in the STS.

  B.Run the Automatic Workload Repository Monitor (ADDM).

  C.Create an STS that contains the queries cached in the library cache and run the SQL Performance Analyzer (SPA) on the workload captured in the STS.

  D.Create an STS that contains the queries cached in the library cache and run the SQL Access Advisor on the workload captured in the STS.

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• 3Identify two valid options for adding a pluggable database (PDB) to an existing multitenant container database (CDB).

  A.Use the CREATE PLUGGABLE DATABASE statement to create a PDB using the files from the SEED.

  B.Use the CREATE DATABASE . . . ENABLE PLUGGABLE DATABASE statement to provision a PDB by copying file from the SEED.

  C.Use the DBMS_PDB package to clone an existing PDB.

  D.B.Use the CREATE DATABASE . . . ENABLE PLUGGABLE DATABASE statement to provision a PDB by copying file from the SEED.C.Use the DBMS_PDB package to clone an existing PDB.D.Use the DBMS_PDB package to plug an Oracle 12c non-CDB database into an existing CDB.

  E.Use the DBMS_PDB package to plug an Oracle 11 g Release 2 (11.2.0.3.0) non-CDB database into an existing CDB.

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• 4A new report process containing a complex query is written, with high impact on thedatabase. You want to collect basic statistics about query, such as the level of parallelism, total database time, and the number of I/O requests.For the database instance STATISTICS_LEVEL, the initialization parameter is set to TYPICAL and the CONTROL_MANAGEMENT_PACK_ACCESS parameter is set to DIAGNOSTIC+TUNING.What should you do to accomplish this task、

  A.Execute the query and view Active Session History (ASH) for information about the query.

  B.Enable SQL trace for the query.

  C.Create a database operation, execute the query, and use theDBMS_SQL_MONITOR.REPORT_SQL_MONITOR function to view the report.

  D.Use the DBMS_APPLICATION_INFO.SET_SESSION_LONGOPS procedure to monitor query execution and view the information from the V$SESSION_LONGOPS view.

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• 5Your multitenant container database (CDB) contains three pluggable database (PDBs).You find that the control file is damaged. You plan to use RMAN to recover the control file. There are no startup triggers associated with the PDBs.Which three steps should you perform to recover the control file and make the database fully operational、

  A.Mount the container database (CDB) and restore the control file from the control file auto backup.

  B.Recover and open the CDB in NORMAL mode.

  C.Mount the CDB and then recover and open the database, with the RESETLOGS option.

  D.Open all the pluggable databases.

  E.C.Mount the CDB and then recover and open the database, with the RESETLOGS option.D.Open all the pluggable databases.E.Recover each pluggable database.

  F.Start the database instance in the nomount stage and restore the control file from control file auto backup.

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• 6Examine this command:SQL > exec DBMS_STATS.SET_TABLE_PREFS (‘SH’, ‘CUSTOMERS’, ‘PUBLISH’, ‘false’);Which three statements are true about the effect of this command、

  A.Statistics collection is not done for the CUSTOMERS table when schema stats are gathered.

  B.Statistics collection is not done for the CUSTOMERS table when database stats are gathered.

  C.Any existing statistics for the CUSTOMERS table are still available to the optimizer at parse time.

  D.B.Statistics collection is not done for the CUSTOMERS table when database stats are gathered.C.Any existing statistics for the CUSTOMERS table are still available to the optimizer at parse tim

  E.D.Statistics gathered on the CUSTOMERS table when schema stats are gathered are stored as pendingE.Statistics gathered on the CUSTOMERS table when database stats are gathered are stored as pending statistics.

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• 7Which two are true concerning a multitenant container database with three pluggable database、

  A.All administration tasks must be done to a specific pluggable database.

  B.The pluggable databases increase patching time.

  C.The pluggable databases reduce administration effort.

  D.The pluggable databases are patched together.

  E.Pluggable databases are only used for database consolidation.

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• 8Examine the current value for the following parameters in your database instance:SGA_MAX_SIZE = 1024MSGA_TARGET = 700MDB_8K_CACHE_SIZE = 124MLOG_BUFFER = 200MYou issue the following command to increase the value of DB_8K_CACHE_SIZE:SQL> ALTER SYSTEM SET DB_8K_CACHE_SIZE=140M;Which statement is true、

  A.It fails because the DB_8K_CACHE_SIZE parameter cannot be changed dynamically.

  B.It succeeds only if memory is available from the autotuned components if SGA.

  C.It fails because an increase in DB_8K_CACHE_SIZE cannot be accommodated within SGA_TARGET.

  D.It fails because an increase in DB_8K_CACHE_SIZE cannot be accommodated within SGA_MAX_SIZ

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• 9Which three statements are true concerning unplugging a pluggable database (PDB)、

  A.The PDB must be open in read only mode.

  B.The PDB must be dosed.

  C.The unplugged PDB becomes a non-CDB.

  D.C.The unplugged PDB becomes a non-CDB.D.The unplugged PDB can be plugged into the same multitenant container database (CDB)

  E.B.The PDB must be dosed.C.The unplugged PDB becomes a non-CDB.D.The unplugged PDB can be plugged into the same multitenant container database (CDB)E.The unplugged PDB can be plugged into another CDB.

  F.The PDB data files are automatically removed from disk.

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• 10Examine the following command:CREATE TABLE (prod_id number(4),Prod_name varchar2 (20),Category_id number(30),Quantity_on_hand number (3) INVISIBLE);Which three statements are true about using an invisible column in the PRODUCTS table、

  A.The %ROWTYPE attribute declarations in PL/SQL to access a row will not display the invisible column in the output.

  B.The DESCRIBE commands in SQL *Plus will not display the invisible column in the output.

  C.Referential integrity constraint cannot be set on the invisible column.

  D.The invisible column cannot be made visible and can only be marked as unused.

  E.A primary key constraint can be added on the invisible column.

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