Download Oracle Database 12c: Performance Management and Tuning.1z0-064.BrainDumps.2018-10-05.51q.vcex

Vendor: Oracle
Exam Code: 1z0-064
Exam Name: Oracle Database 12c: Performance Management and Tuning
Date: Oct 05, 2018
File Size: 2 MB
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Demo Questions

Question 1
Which two actions can reduce library cache latch contention for an OLTP application that repeatedly executes queries containing a mix of literals and bind variables? (Choose two.)
  1. setting the OPEN_CURSORS parameter to hold a sufficient number of concurrently open cursors
  2. coding the application such that a frequently executed statement is parsed only once and executed repeatedly as required
  3. setting the CURSOR_SHARING parameter to EXACT
  4. avoiding the granting of privileges on objects associated with cursors during peak load
  5. enabling Automatic Memory Management and allocating at least 50% of the available memory for SHARED_POOL_SIZE 
  6. configuring shared server connections
Correct answer: CE
Explanation:
Reference: http://docs.oracle.com/cd/B28359_01/server.111/b28274/memory.htm
Reference: http://docs.oracle.com/cd/B28359_01/server.111/b28274/memory.htm
Question 2
You are administering a database that supports multiple applications, which make dedicated connections to the database instance by using different services. 
You execute the command to enable tracing of the ORCL1 service:
  
Which two statements are true? (Choose two.) 
  1. A single trace file is generated for all sessions mapped to the ORCL1 service.
  2. SQL trace is enabled for all modules and actions for sessions mapped to the ORCL1 service.
  3. An SQL trace file is generated for each session that maps to the ORCL1 service.
  4. An SQL trace file is generated for each of the modules using the ORCL1 service.
  5. SQL trace is not enabled for the service because a module name is not specified.
Correct answer: AC
Question 3
In which three situations can dynamic statistics be used? (Choose three.)
  1. when the sampling time is a small fraction of the total time for a query
  2. when an execution plan is suboptimal because of complex predicates
  3. when extended statistics are not available for SQL statements that use complex predicates
  4. when a query is on a partitioned table with a global index
  5. when index statistics are missing on a column that is used in SQL statements with highly selective filters
Correct answer: BCD
Explanation:
Reference: https://docs.oracle.com/database/121/TGSQL/tgsql_statscon.htm#TGSQL341
Reference: https://docs.oracle.com/database/121/TGSQL/tgsql_statscon.htm#TGSQL341
Question 4
You want to generate statistics for new objects added to an OLTP application without affecting old statistics and the sessions that currently use them. 
Which two tasks would you perform to test the new statistics? (Choose two.)
  1. Set the OPTIMIZER_USE_PENDING_STATISTICS initialization parameter to TRUE for the session.
  2. Set the STALE_PERCENT statistics preference to zero and then gather statistics.
  3. Set the PUBLISH statistics preference to FALSE and then gather statistics.
  4. Use the DBMS_STATS.PUBLISH_PENDING_STATS procedure to make pending statistics the current statistics. 
  5. Set the NO_INVALIDATE statistics preference to FALSE and gather statistics without affecting old statistics.
Correct answer: AB
Question 5
You recently joined a new team administering a database. 
You notice that full table scans are performing poorly compared with full table scans on the databases you administered in a previous job. 
You decide that performance problems are caused by a misconfiguration of factors affecting full table scans. 
Which three factors should you investigate to determine the cause of the poorly performing Full Table Scans (FTS)? (Choose three.)
  1. value of DB_FILE_MULTIBLOCK_READ_COUNT
  2. storing query results in the result cache
  3. setting of the DISK_ASYNC_IO parameter to TRUE
  4. setting of the OPTIMIZER_MODE parameter to ALL_ROWS
  5. use of parallel queries
  6. block size of the tablespaces in which the tables being scanned are stored
  7. value of the OPTIMIZER_DYNAMIC_SAMPLING parameter
Correct answer: ABC
Question 6
Examine the Time Model Statistics section of an AWR report:
  
Which two inferences can be definitely derived from this section? (Choose two.)
  1. The available CPU resources were not utilized to their maximum capacity.
  2. All sequence numbers used during this AWR time interval were cached.
  3. A large number of connected user sessions were idle.
  4. New child cursors were created because of new bind values or usage of literal values as well as different bind types or sizes.
  5. The DB CPU time was not spent exclusively for processing SQL statements.
Correct answer: DE
Explanation:
Question 7
Examine the partial TOP 10 Foreground Events by Total Wait Time section of an AWR report:
  
What should you examine to diagnose the cause of the top three wait events? (Choose the best answer.) 
  1. the V$ACTIVE_SESSION_HISTORY view
  2. the Time Model Statistics section of the AWR report
  3. the SQL statements based on elapsed time from the AWR report
  4. the Latch Activity section
  5. the Segment Statistics section of the AWR report 
Correct answer: B
Question 8
Examine the partial AWR report taken for a time period of 60 minutes:
  
Which two inferences can you draw from this report? (Choose two.)
  1. The database user calls are issuing frequent explicit commits. 
  2. The CPUs are busy executing server processes and background processes for a considerable amount of CPU time.
  3. The database user calls are spending most of their time in I/O for single block reads.
  4. The database user calls are spending most of their time waiting for sessions that are in more important consumer groups.
Correct answer: BC
Question 9
For your database some users complain about not being able to execute transactions. Upon investigation, you find that the problem is caused by some users performing long-running transactions that consume huge amounts of space in the UNDO tablespace. 
You want to control the usage of the UNDO tablespace only for these user sessions. 
How would you avoid the issue from repeating in future? (Choose the best answer.)
  1. Create a profile for the users with the LOGICAL_READS_PER_SESSION and LOGICAL_READS_PER_CALL limits defined.
  2. Create external roles to restrict the usage of the UNDO tablespace and assign them to the users.
  3. Set the threshold for UNDO tablespace usage for the users.
  4. Implement a Database Resource Manager plan by mapping the users to a resource consumer group with limits defined for UNDO tablespace usage.
Correct answer: D
Question 10
Which two actions should you take to monitor the throughput generated by the modules of an application? (Choose two.)
  1. Use the Resource Manager.
  2. Enable SQL Trace at the session level.
  3. Create a service.
  4. Use a dedicated server configuration. 
  5. Use the DBMS_APPLICATION_INFO package to define the current module and action so that they appear in V$SESSION.
Correct answer: AB
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