Reliable 1Z0-084 Test Braindumps & Valid 1Z0-084 Test Materials
Reliable 1Z0-084 Test Braindumps & Valid 1Z0-084 Test Materials
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Oracle Database 19c Performance and Tuning Management Sample Questions (Q40-Q45):
NEW QUESTION # 40
Which two statements are true about space usage in temporary tablespaces?
- A. When a session consumes all temporary tablespace storage, then the session would hang until the temporary space used by that session is cleared.
- B. Temporary tablespaces setting Includes quotas to limit temporary space used by a session for that Temporary tablespace.
- C. When a global temporary table instantiation is too large to fit in memory, space is allocated in a temporary tablespace.
- D. A sort will fail if a sort to disk requires more disk space and no additional extent can be found/allocated in/for the sort segment.
- E. Lack of temporary tablespace space for sort operations can be prevented by using temporary tablespace groups.
Answer: C,E
Explanation:
Regarding space usage in temporary tablespaces, the following statements are true:
* A (Correct): When a global temporary table or a sort operation exceeds the available memory, Oracle Database allocates space in a temporary tablespace to store the temporary data or intermediate results.
* E (Correct): Using temporary tablespace groups can prevent insufficient temporary tablespace for sort operations by providing a collective pool of space from multiple temporary tablespaces, which can be used for user sorting operations.
The other options provided have inaccuracies:
* B (Incorrect): Oracle does not provide a mechanism for setting quotas on temporary tablespaces.
Quotas can be set for permanent tablespaces but not for temporary ones.
* C (Incorrect): A sort operation may fail due to insufficient space, but Oracle will attempt to allocate space in the temporary tablespace dynamically. If no space can be allocated, an error is returned rather than a sort failure.
* D (Incorrect): If a session consumes all available temporary tablespace storage, Oracle will not hang the session; it will return an error to the session indicating that it has run out of temporary space.
References:
* Oracle Database Administrator's Guide: Managing Space for Schema Objects
* Oracle Database Concepts: Temporary Tablespaces
NEW QUESTION # 41
Which application lifecycle phase could be managed reactively?
- A. Production
- B. Upgrade or migration
- C. Design and development
- D. Testing
- E. Deployment
Answer: A
Explanation:
The production phase of the application lifecycle is often managed reactively. While proactive measures and performance tuning are essential, unforeseen issues can arise in production that require immediate attention and resolution. Reactive management involves monitoring performance and responding to issues as they occur, ensuring the application maintains acceptable performance levels for end-users.
References
* Oracle Database 19c Performance Tuning Guide - Reactive Tuning
NEW QUESTION # 42
Multiple sessions are inserting data concurrently into a table that has an LOB column.
At some point in time, one of the sessions cannot find available space in the LOB segment and needs to allocate a new extent.
Which wait event will be raised in the other sessions that need space in the LOB column?
- A. enq: SQ - contention
- B. enq: TM - contention
- C. enq: TX - allocate ITL entry
- D. enq: HW - contention
Answer: D
Explanation:
When sessions concurrently insert data into a table with an LOB column and one session needs to allocate a new extent because it cannot find available space, the wait event associated with this contention is "enq: HW - contention". The HW stands for High Water Mark which is related to space allocation in the database segment. When a session needs to allocate a new extent, it may raise this wait event in other sessions that are also attempting to allocate space in the same LOB segment.
References
* Oracle Database 19c Reference Guide - enq: HW - contention
NEW QUESTION # 43
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 conflict between the two plan stability methods results in an error.
- B. The existence of two concurrent plan stability methods generates a child cursor for every execution.
- C. The execution plan is the one enforced by the SQL Profile.
- D. The execution plan is the one enforced by the SQL Plan Baseline.
- E. The SQL Plan Baseline must be accepted in order to be used for the execution plan.
- F. The SQL Profiles as well as SQL Plan Baseline are implemented using hints, so they both generate the same plan.
Answer: C,E
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 # 44
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_INVALIDATION = DEFERRED;
- B. ALTER SYSTEM SET CURSOR_SHARING = FORCE;
- C. ALTER SYSTEM SET SESSION CACHED CURSORS = 500;
- D. ALTER SYSTEM SET CURSOR_SPACE_FOR_TIME - TRUE;
Answer: A
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 # 45
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