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New 1Z0-084 Cram Materials & New 1Z0-084 Test Online

New 1Z0-084 Cram Materials & New 1Z0-084 Test Online

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Oracle Database 19c Performance and Tuning Management Sample Questions (Q38-Q43):

NEW QUESTION # 38
Which procedure gathers statistics that are always used in the generation of any execution plan?

  • A. DBMS_STATS.GATHER_FIXED_ OBJECTS_STATS
  • B. DBMS_STATS.GATHER_DICTIONARY_STATS
  • C. DBMS_STATS.GATHER_DATABASE_STATS
  • D. DBMS_STATS.GATHER_SYSTEM_STATS

Answer: C

Explanation:
TheDBMS_STATS.GATHER_DATABASE_STATSprocedure is used to gather statistics for all schema objects in the database that do not have up-to-date statistics. These statistics are essential for the optimizer to make informed decisions about the most efficient way to execute a query. The procedure collects statistics such as table and column statistics, index statistics, and system statistics, which are all used in the execution plan generation.
References:
* Oracle Database PL/SQL Packages and Types Reference, 19c
* Oracle Database Performance Tuning Guide, 19c


NEW QUESTION # 39
Examine these statements and output:

What parameter change activates the generation and use of SQL Plan Directives7

  • A. optimizer_dynamic_sampling=11
  • B. optimizer_features_enable=12.2.0.1
  • C. optimizer_capture_sql_plan_baselines_TRUE
  • D. optimizer_adaptive_plans=TRUE
  • E. optimizer_adaptive_statistics = TRUE

Answer: E

Explanation:
The optimizer_adaptive_statistics parameter, when set to TRUE, enables the optimizer to use adaptive statistics, such as SQL Plan Directives, to help improve plans by automatically adjusting them based on the actual execution statistics.
References:
* Oracle Database SQL Tuning Guide, 19c


NEW QUESTION # 40
You use SQL Tuning Advisor to tune a given SQL statement.
The analysis eventually results in the implementation of a SQL Profile.
You then generate the new SQL Profile plan and enforce it using a SQL PlanBaselinebut forget to disable the SQLProfile and a few days later you find out that the SQL Profile is generating a new execution plan.
Which two statements are true?

  • A. The existence of two concurrent plan stability methods generates a child cursor for every execution.
  • B. The execution plan is the one enforced by the SQL Plan Baseline.
  • C. The SQL Profiles as well as SQL Plan Baseline are implemented using hints, so they both generate the same plan.
  • D. The conflict between the two plan stability methods results in an error.
  • E. The SQL Plan Baseline must be accepted in order to be used for the execution plan.
  • F. The execution plan is the one enforced by the SQL Profile.

Answer: E,F

Explanation:
When both a SQL Profile and a SQL Plan Baseline are in place, the SQL Profile has a stronger preference and the optimizer is more likely to choose the execution plan from the SQL Profile.
C: A SQL Profile is generally more influential than a SQL Plan Baseline because it contains additional statistics and directives that help the optimizer to generate a more efficient execution plan. If both exist, the optimizer will use the profile's plan unless the baseline's plan is proven to be better through the SQL performance monitoring process.
E: SQL Plan Baselines must be accepted before they can be used by the optimizer. If a SQL Plan Baseline is not accepted, it will not be considered for generating the execution plan. Therefore, the presence of an unaccepted SQL Plan Baseline will not automatically force the optimizer to use its plan.
References:
* Oracle Database SQL Tuning Guide, 19c
* Oracle Database Administrator's Guide, 19c


NEW QUESTION # 41
An Oracle 19c database uses default values for all optimizer initialization parameters.
After a table undergoes partition maintenance, a large number of wait events occur for:
cursor: pin S wait on X
Which command reduces the number of these wait events?

  • A. ALTER SYSTEM SET CURSOR_SPACE_FOR_TIME - TRUE;
  • B. ALTER SYSTEM SET CURSOR_INVALIDATION = DEFERRED;
  • C. ALTER SYSTEM SET CURSOR_SHARING = FORCE;
  • D. ALTER SYSTEM SET SESSION CACHED CURSORS = 500;

Answer: B

Explanation:
The cursor: pin S wait on X wait event suggests contention for a cursor pin, which is associated with mutexes (a type of locking mechanism) that protect the library cache to prevent concurrent modifications.
This issue can often be alleviated by deferring the invalidation of cursors until the end of the call to reduce contention. The correct command to use would be:
* C (Correct): ALTER SYSTEM SET CURSOR_INVALIDATION=DEFERRED; This setting defers the invalidation of dependent cursors until the end of the PL/SQL call, which can reduce the cursor: pin S wait on X wait events.
The other options are incorrect in addressing this issue:
* A (Incorrect): Setting CURSOR_SHARING to FORCE makes the optimizer replace literal values with bind variables. It doesn't address the contention for cursor pins directly.
* B (Incorrect): CURSOR_SPACE_FOR_TIME=TRUE aims to reduce the parsing effort by keeping cursors for prepared statements open. It may increase memory usage but does not directly resolve cursor: pin S wait on X waits.
* D (Incorrect): Increasing SESSION_CACHED_CURSORS caches more session cursors but doesn't necessarily prevent the contention indicated by the cursor: pin S wait on X wait events.
References:
* Oracle Database Reference: CURSOR_INVALIDATION
* Oracle Database Performance Tuning Guide: Reducing Cursor Invalidation


NEW QUESTION # 42
A database supporting a mixed workload is hosted on a server with 64 CPUs.
A large number of free buffer waits and buffer busy waits occur affecting performance.
The buffer cache size was then increased but after a few hours, the same wait events occur more often than before the change.
Examine these parameter settings:

Which two actions can help reduce the number of these waits7

  • A. increasing the value of DB_FILE_MULTIBLOCK_READ_COUNT to 128
  • B. setting dbwr_io_slaves to 64
  • C. reducing the values of DB_FILE_MULTILOCK_READ_COUNT to 64
  • D. Increasing the size of MEMORYTARGET
  • E. increasing the value of DBWRITERPROCESSES to 64,

Answer: B,E

Explanation:
Given a server with 64 CPUs, if the buffer cache size increase did not alleviate free buffer waits and buffer busy waits, one can look into optimizing I/O and the efficiency of the DB writer processes.
C: Setting theDBWR_IO_SLAVESparameter to a non-zero value, such as the number of CPUs, would initiate I/O slave processes to assist the DB writer process. This can help reduce I/O contention when writing from the buffer cache to disk, particularly for systems without asynchronous I/O capabilities.
D: Increasing the value ofDBWRITERPROCESSESenables multiple DB writer processes to be active simultaneously. In a system with many CPUs, such as 64, increasing this value can improve the write throughput to disk and potentially reduce buffer busy waits.
References:
* Oracle Database Reference, 19c
* Oracle Database Performance Tuning Guide, 19c


NEW QUESTION # 43
......

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