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2021 Jun 1z0-054 Study Guide Questions:
Q111. You work as a DBA for a company and you have the responsibility of managing one of its online transaction processing (OLTP) systems. The database encountered performance-related problems and you generated an Automatic Workload Repository (AWR) report to investigate it further. View the Exhibits and examine the AWR report.
What could be the problem in this database?
A. Java pool is not configured.
B. The CPU in the system is slow.
C. The shared pool size is inadequate.
D. The database buffer cache is inadequate.
E. The OPEN_CURSORS parameter is set to a small value.
Q112. View the Exhibit and examine the sample Automatic Database Diagnostic Monitor (ADDM) report.
Which statement is true about the report?
A. The sum of impacts under recommendations in Finding 2 cannot exceed 100%.
B. It is possible that the sum of impacts under recommendations in Finding 2 can exceed 100%.
C. The recommendations regarding "buffer busy" wait cannot appear more than once in the report.
D. The sum of impacts of recommendation 2 in Finding 1 and recommendation 2 in Finding 2 cannot exceed 100%.
Q113. As part of a proactive tuning activity, you have the Automatic Workload Repository (AWR) and ADDM enabled for your database with the default setting of snapshot retention as 8 days and snapshot interval as 60 minutes.
Which performance issue does NOT appear in the ADDM and needs alternative tools for investigation?
A. suboptimal parameter settings
B. application-level block contention
C. performance issues related to the Resource Manager
D. short-lived or intermittent performance issues lasting for less than 5 minutes
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Q114. You upgraded database from the Oracle Database 10g to Oracle Database 11g. To test the performance SQL on the upgraded database. You want to build the before-change performance data by using SQL Performance Analyzer.
Which method would allow the task to execute quickly?
A. the EXPLAIN PLAN method
B. the TEST EXECUTE method
C. the COMPARE PERFORMANCE method
D. the OPTIMIZER_USE_SQL_PLAN_BASELINE parameter set to TRUE
Q115. Examine the output of the following query:
SQL>; SELECT c.name,a.addr,a.gets,a.misses,a.sleeps,
3 FROM v$latch a, v$latchholder b, v$latchname c
4 WHERE a.addr = b.laddr(+) and a.latch# = c.latch#
5 AND c.name LIKE '%latch_name%' ORDER BY a.latch#;
LATCH NAME ADDR GETS MISSES SLEEPS IMMEDIATE_GETS IMMEDIATE_MISSES
------------ -------- -------- ------- ------ -------------- ----------------
shared pool 20016544 8520540 14112 3137 0 0
Which two conclusions can you draw from this? (Choose two.)
A. The latch was requested in no wait mode.
B. The latch was requested in willing-to-wait mode.
C. The shared pool operations to allocate and free memory in it caused the misses.
D. Automatic Memory Management is not enabled because the IMMEDIATE_GETS and IMMEDIATE_MISSES columns have zero in them.
Q116. View the Exhibit that shows your investigation of performance degradation in your database. You also know that there are a few tablespaces using automatic segment-space management in the database.
What could be the problem?
A. There are excessive disk sorts.
B. There are excessive memory sorts.
C. There is a contention due to free list management.
D. The tablespace that contains the segments on which waits are occurring is full.
E. The server process is processing buffers at a rate that is faster than the rate at which the I/O system can return the buffers.
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Q117. While diagnosing performance problems for a database, you find Buffer Busy wait is the reason from V$ views. But the Automatic Database Diagnostic Monitor (ADDM) report does not reflect the Buffer Busy findings.
Why does the Buffer Busy finding not appear in the ADDM report?
A. because an ADDM filter has been set
B. because the he USE_INDIRECT_DATA_BUFFERS parameter has been set to TRUE
C. because the DBIO_EXPECTED default task parameter for ADDM has been set to zero
D. because the CONTROL_MANAGEMENT_PACK_ACCESS parameter has been set to DIAGNOSTIC
Q118. 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 production 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 performed the following operations for replay:
1) You preprocessed the captured workload.
2) You restored the replay database to match the capture database at the start of the workload capture.
3) You resolved all external references.
4) You set up replay clients.
You have the following replay considerations:
1) load testing to be performed
2) all the sessions to connect immediately
3) user waits between issuing calls to be kept to a minimum
What replay options would you choose to accomplish the replay?
A. SYNCHRONIZATION = FALSE, THINK_TIME_SCALE = 0,
CONNECT_TIME_SCALE = 0 and THINK_TIME_AUTO_CORRECT = FALSE
B. SYNCHRONIZATION = TRUE, THINK_TIME_SCALE = 100,
CONNECT_TIME_SCALE = 0 and THINK_TIME_AUTO_CORRECT = FALSE
C. SYNCHRONIZATION = FALSE, THINK_TIME_SCALE = 100, CONNECT_TIME_SCALE = 100 and
THINK_TIME_AUTO_CORRECT = TRUE
D. SYNCHRONIZATION = TRUE, THINK_TIME_SCALE = 100,
CONNECT_TIME_SCALE = 100 and
THINK_TIME_AUTO_CORRECT = FALSE
Q119. 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. STATSPACK Report
C. AWR Compare Report
D. SQL Performance Analyzer
Q120. You are working on an online transaction processing (OLTP) system. You detected free buffer waits events for your database instance running in a machine that has multiple CPUs. You increased the database buffer cache size as the first step. After a few hours of work on the database, further investigation shows that the same event is being recorded.
What would be your next step to avoid this event in future?
A. Decrease the value of the DBWR_IO_SLAVES parameter.
B. Set the USE_INDIRECT_DATA_BUFFERS parameter to TRUE.
C. Increase the value of the DB_WRITER_PROCESSES parameter.
D. Increase the value of the DB_FILE_MULTIBLOCK_READ_COUNT parameter.