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NEW QUESTION NO: 9
In a database, the values for transactions per second are higher during working hours and lower during nonworking hours. You want to receive alerts in future time periods if the daytime performance varies compared to the captured daytime performance or the nighttime performance varies compared to the captured nighttime performance, over a repeating time period. This would permit the DBA to perform additional performance tuning operations. Which feature would you use to record this variation in performance statistics?
A. the Automatic Workload Repository (AWR) baseline template
B. the Automatic Workload Repository (AWR) baseline
C. SQL tuning set
D. SQL plan baselines
Answer: A
NEW QUESTION NO: 10
Your organization has purchased licenses for the Diagnostic Pack along with the Oracle Database 11g software.The application workload on your database is known to be stable between 10:00 PM and midnight every night, but the performance on a particular Thursday was poor between 10:00 PM and 11:00 PM. Which tool would you consider using first to diagnose the cause of the performance degradation?
A. Database Replay
B. AWR Compare Report
C. SQL Performance Analyzer
D. STATSPACK Report
Answer: B
NEW QUESTION NO: 11
You are a DBA in ABC Corp. You are working on an online transaction processing (OLTP) system.The applications running on the database use connection pooling to connect to the database to perform transactions.
The company wants to upgrade the CPU and the memory for the machine on which the database is running. To test the realistic workload on the new machine with increased CPU and memory, you identified the peak workload time for the database and captured the workload on the production system.
You set up the test machine with the upgraded CPU and memory and installed the database with the same version as production.
Which three actions would you perform to accomplish the realistic replay of the peak workload on the test machine? (Choose three.)
A. Set up as many replay clients as there are actual clients to the production system.
B. Resolve all external references such as database links, external tables, and directory objects.
C. Preprocess the captured workload for the specified target database version.
D. Set up all the replay clients on the same machine on which the test database is running.
E. Restore the replay database to match the capture database at the start of the workload capture.
Answer: B,C,E
NEW QUESTION NO: 12
You identified poorly performing SQL statements that use bind variables. You want to examine the execution plans for the most recently executed statements for further diagnosis. Which method would you recommend to view the execution plans?
A. EXPLAIN PLAN for SQL statements
B. the dbms.xplan package
C. SQL*Plus Autotrace
D. the SQL trace utility to generate trace files and read the formatted output using the tkprof utility
Answer: B
NEW QUESTION NO: 13
Examine the following block that executes a SQL Performance Analyzer task:
begin dbms_sqlpa.execute_analysis_task(task_name => 'SPA_SKD4', execution_type => 'TEST EXECUTE',
execution_name => 'before');
end;
Which two statements are true about the execution? (Choose two.)
A. The test plans are executed, but not generated if they are available in the plan baseline.
B. It executes only the query part of the DML statements.
C. The test plans are generated and added to plan baseline.
D. It generates execution plans and execution statistics.
Answer: B,D
NEW QUESTION NO: 14
Examine the initialization parameter values for the instance given below:
NAME TYPE VALUE
------------------------------------ ----------- ------------------
optimizer_capture_sql_plan_baselines boolean FALSE
optimizer_dynamic_sampling integer 2
optimizer_features_enable string 11.1.0.6
optimizer_index_caching integer 0
optimizer_index_cost_adj integer 100
optimizer_mode string ALL_ROWS
db_file_multiblock_read_count integer 64
The index created on the column used in the WHERE clause of the query. You notice that the query is not using the index. Instead of an index scan, a full table scan is used.
View the Exhibit and examine the autotrace output for a query.
What could be the reason for it? (Choose all that apply.)
A. The table has less than DB_FILE_MULTIBLOCK_READ_COUNT blocks under the high-water mark.
B. The statistics for the table and all the indexes associated with the table are not current.
C. The OPTIMIZER_INDEX_COST_ADJ initialization parameter has a low value.
D. The DB_FILE_MULTIBLOCK_READ_COUNT initialization parameter has a low value.
Answer: A,B
NEW QUESTION NO: 15
View the Exhibit.You decide to quickly configure the adaptive threshold. What would happen to the existing metric thresholds shown in the Exhibit?
A. Only the thresholds set with baselines other than the SYSTEM_MOVING_WINDOW baseline will remain in effect.
B. It would be overwritten.
C. It would remain in effect.
D. Only the thresholds set with the SYSTEM_MOVING_WINDOW baseline will remain in effect.
Answer: B
NEW QUESTION NO: 16
In which case is the database buffer cache NOT used?
A. when physical I/Os are performed to read from data files
B. when the server process writes sort data to the temporary tablespace
C. when the database writer process writes to the SYSTEM tablespace
D. when the database writer process writes undo data to the undo tablespace
Answer: B
NEW QUESTION NO: 17
You plan to collect statistics for an important table in your database to help improved query performance.
You are uncertain about the optimizer behavior after the statistics have been collected because currently there are no statistics for indexes or partitions on the table. You wish to test the performance effect of the newly collected statistics. How would you prevent the optimizer from using the newly collected statistics for other sessions immediately after statistics collection?
A. Set the OPTIMIZER_USE_SQL_PLAN_BASELINES parameter to FALSE for the session.
B. Set the OPTIMIZER_USE_PENDING_STATISTICS parameter to FALSE for the session.
C. Set the NO_VALIDATE preference to TRUE for the table.
D. Set the PUBLISH preference to FALSE for the table.
E. Set the OPTIMIZER_DYNAMIC_SAMPLING parameter to 0.
Answer: D
NEW QUESTION NO: 18
Which two statements are true about the database buffer cache? (Choose two.)
A. A buffer can be written to by many processes at the same time.
B. A buffer containing a block that is identical to the block on disk is called free buffer.
C. A buffer containing a block that is being accessed by a process is called dirty buffer.
D. A buffer available to be overwritten with a different database block at any time is called a dirty buffer.
E. A buffer can contain a different version of a block that is available in a different buffer of the same cache.
Answer: B,E
NEW QUESTION NO: 19
View the Exhibit and examine the Instance Efficiency Percentages that you got on generating an Automatic Workload Repository (AWR) report for your online transaction processing (OLTP) database.What can you deduce from this part of the AWR report? (Choose all that apply.)
A. A high Buffer Hit % indicates that required data blocks were found in the Buffer Cache memory, thereby avoiding expensive disk I/O.
B. A low Library Hit % indicates that cursors are not being reused.
C. A low Execute to Parse % indicates that most SQL statements are reusing the existing execution plans.
D. A high In-memory Sort % indicates that most sorts are being done in memory, thereby causing the performance to degrade.
Answer: A,B