|Exam Name||:||Oracle Database 12c: Performance Management and Tuning|
|Questions and Answers||:||84 Q & A|
|Updated On||:||January 22, 2018|
|PDF Download Mirror||:||[1Z0-064 Download Mirror]|
|Get Full Version||:||Pass4sure 1Z0-064 Full Version|
In theCUSTOMERStable, the values in theCUST_STATEcolumn are dependent on the values in theCOUNTRY_IDcolumn. You want to make the optimizer aware of this dependency when these columns are used together inWHEREclause predicates that contain equalities or in-lists. Which two methods achieve this?(Choose two.)
gathering statistics on theCUSTOMERStable and its dependent objects, and then locking the statistics
using SQL plan directives to generate an optimal plan
setting the dynamic statistics level to 4 and setting theOPTIMIZER_USE_PENDING_STATISTICSinitialization parameter to true
creating column group statistics, regatheringstatistics, and ensuring that histograms exist on both these columns
Examine the parameters set for a database instance:
The database supports a mixed workload. Users complain about the increased response time of a few DSS queries. During investigation, you execute the query:
Based on the output, which two are possible ways to improve the performance of the queries?(Choose two.)
Enable temporary undo.
Enable Automatic Memory Management.
Increase the number of DBWnprocesses.
Enable Automatic Shared Memory Management.
Increase the value of theSGA_TARGETparameter.
Increase the value of thePGA_AGGREGATE_TARGETparameter.
You are administering a database that supports a mixed workload. TheCURSOR_SHARINGparameter is set to the default value. While analyzing the latest Automatic Workload Repository (AWR) report, you find a large number ofcursor: pin S wait on X, cursor: pin X wait on S, andlibrary cache mutexwaits in the Top 10 foreground events section. Examine the Instance Efficiency Percentages section in the AWR report:
Which three statements are true in this scenario?(Choose three.)
Sessions are waiting for mutexes in share mode on cursorsbut other sessions are holding the mutexes in exclusive mode.
The CPU is spending more time in finding cursors in the library cache.
Cursors are not getting shared, resulting in a large number of hard parses.
Sessions are waiting for mutexes in exclusive mode on cursors but other sessions are holding the mutexes in share mode.
The buffers required by queries are not found in the buffer cache, thereby increasing expensive disk I/O.
Identify two effects of theDB_FILE_MULTIBLOCK_READ_COUNTparameter on the optimizer.(Choose two.)
Decreasing the value ofDB_FILE_MULTIBLOCK_READ_COUNTfrom the default increases the cost of index probes for DSS workloads.
A full table scan can become cheaper than index scans if the database instance has a high enoughDB_FILE MULTIBLOCK_READ_COUNTfor both OLTP and DSS workloads.
Increasing the value ofDB_FILE_MULTIBLOCK_READ_COUNTwithin OS limits
lowers the costingof an index probe that is done inconjunctionwith a nested loop for OLTP workloads.
In DSS workloads where full table scans may run in parallel and bypass the buffer cache, decreasing the value ofDB_FILE_MULTIBLOCK_READ_COUNTfrom the default increases the cost of full table scans.
Increasing the value ofDB_FILE_MULTIBLOCK_READ_COUNTwithin OS limits lowers the cost of full table scans and can result in the optimizer choosing a full table scan over an index scan for both OLTP and DSS workloads.
In your database, the measured 99thpercentile value is used as the maximum value. You set a warning threshold level of 110% of maximum trigger as an alert. What is the outcome?(Choose the best answer.)
It generates an error because the warning threshold cannot exceed 100%.
It generates an error because the percentage of maximum threshold cannot be set with a significance-level threshold value.
It generates an alert when an observed metric is 99% of the 99thpercentile value as measured over the moving window baseline.
It generates an alert when an observed metric is 110% of the 99thpercentile value as measured over the moving window baseline.
It generates an alert when 1 in 100 observations for an observed metric exceeds the 99thpercentile value as measured over the fixed baseline.
Youwant to capture AWR data to monitor performance variation every Monday between 9:00 AM and 12:00 PM for three months and automatically remove the older AWR data every fortnight. How would you achieve this?(Choose the best answer.)
Create AWR baselines.
Create SQL plan baselines.
Create repeating baseline templates.
Create database services and make sure that user connections use them to connect to the database instance.
Create a single baseline template.
Examine the command to change a parameter value from the default to 50: SQL> ALTER SYSTEM SET OPTIMIZER_INDEX_COST_ADJ = 50; What is the effect of changing the value of the parameter?(Choose the best answer.)
It influences the optimizer to use full table scans instead of index scans as the estimated cost of full table scan is reduced.
It influences the optimizer to use bitmap indexes as the estimated cost of conversion from bitmap to rowid is reduced.
It influences the optimizer to always use fast full index scans as the estimated cost of using an index is reduced.
It influences the optimizer to use indexes instead of full table scans as the estimated cost of using an index is reduced.
Your database supports a DSS workload. In an application, a few complex queries that contain multiple functions and expressions are using materialized views. You notice that some queries are performing poorly because they are not benefiting from query rewrites. Which three actions would you take to improve the performance of queries?(Choose three.)
Create an SQL Tuning Set (STS) and submit as input to the SQL Access Advisor to generate recommendations about query rewrite and fast refresh for materialized views.
Use theDBMS_MVIEW.EXPLAIN_REWRITEprocedure to analyze why a query failed to rewrite.
Create an STS and submit as input to the SQL Performance Analyzer to get recommendations about improving the performanceof queries.
Use theDBMS_ADVISOR.TUNE_MVIEWprocedureto get recommendations about rewritingmaterialized views.
Use theDBMS_ADVISOR.QUICK_TUNEprocedure to analyze queries based on the usage of query rewrite with materialized views.
You have been asked to assess if using column store compression (previously known as hybrid columnar compression or HCC) would help improve the performance of queries on
some large tables. Which three aspects should you consider before you choose this compression method?(Choose three.)
Check whether direct path load operations are used to insert rows in the table.
Check whether the table is frequently queried using fulltablescans as column store compression only minimizes I/O during full table scans.
Check whether the table is frequently updated because it will have overhead for insert and update operations.
Check whether the table has LOB columns as it will minimize I/O for the queries.
Check whether the table blocks aresparselypopulated as this will defragment the blocks.
You execute this query twice in a session:
Then you queryV$SQL_SHARED_CURSORfor details about child cursors as shown.
Which two statements are true?(Choose two.)
No statistics were collected during the first execution of the query.
A subsequent execution of the query in this session is likely to undergo a soft parse.
The second execution of the query was hard parsed because the estimated cardinality was inaccurate.
A subsequent execution of the query in this session will undergo a hard parse.
The second execution of the query was hard parsed because extended statistics were collected after the first execution of the query.
Examine the initialization parameters set for a database instance:
The database supports an OLTP workload. Applications connect to the instance using shared server connections and perform small, random I/Os. All the data files are on the same disk. You notice free buffer wait events for sessions in the database instance. To solve the problem, you increase the size of the buffer cache. But after some time, you notice sessions waiting again on free buffer waits. What will you recommend to alleviate the issue? (Choose the best answer.)
Run the I/O calibration tool.
Configure the database instance to make asynchronous I/O available to DBWR.
Spread the data files over multiple disks, controllers, and I/O buses to ensure that there are no hotspots in the I/O subsystem.
Configure dedicated server connections for the applications.
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 theUNDOtablespace. You want to control the usage of theUNDOtablespace only for these user sessions. How would you avoid the issue from repeating in future?(Choose the best answer.)
Create a profile for the users with theLOGICAL_READS_PER_SESSIONandLOGICAL_READS_PER_CALLlimits defined.
Create external roles to restrict the usage of theUNDOtablespace and assign them to the users.
Set the threshold forUNDOtablespace usage for the users.
Implement a Database Resource Manager plan by mapping the users to a resource consumer group with limits defined forUNDOtablespace usage.
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