1Z0-084 AUTHORIZED PDF | 1Z0-084 EXAM SIMULATOR ONLINE

1Z0-084 Authorized Pdf | 1Z0-084 Exam Simulator Online

1Z0-084 Authorized Pdf | 1Z0-084 Exam Simulator Online

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Oracle 1Z0-084 (Oracle Database 19c Performance and Tuning Management) Certification Exam is a highly sought-after certification exam for those who want to specialize in performance tuning and management of Oracle Database 19c. Oracle Database 19c Performance and Tuning Management certification exam is designed to test the candidate's knowledge and skills in managing and tuning the performance of an Oracle Database 19c. 1Z0-084 Exam covers a wide range of topics including performance tuning methodology, database architecture, SQL tuning, memory management, and more.

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Most Probable Real Exam Questions in 1Z0-084 Oracle Database 19c Performance and Tuning Management PDF Dumps Format

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Oracle Database 19c Performance and Tuning Management Sample Questions (Q34-Q39):

NEW QUESTION # 34
Examine this command:

What is the maximum number of baselines generated by this command that you can have at any given time?

  • A. 0
  • B. 1
  • C. 2
  • D. 3

Answer: B

Explanation:
The DBMS_WORKLOAD_REPOSITORY.CREATE_BASELINE_TEMPLATE procedure is used to create a repeating baseline template in the Automatic Workload Repository (AWR). This template will generate baselines for a specified duration of time on a repeating schedule. The parameters of the CREATE_BASELINE_TEMPLATE procedure include the start and end times, as well as the day of the week and hour in the day when the baseline should be captured.
Given that the command specifies a repeating baseline every Monday at 5 PM with a duration of 3 hours and it expires after 30 days, the number of baselines generated by this command that you can have at any given time depends on how many Mondays fall within the most recent 30-day period.
Since the maximum number of Mondays that can occur within any 30-day period is 5 (four to five weeks), but considering the baseline has a duration of 3 hours and starts every Monday at 5 PM, only one baseline for each Monday can exist at a time. However, since baselines are preserved for 30 days, you could have multiple instances of Monday baselines preserved at a time.
* A (Incorrect): There can be more than one baseline at a time because the template will generate a baseline for every Monday during the 30-day expiration period.
* B (Incorrect): There will be more than three baselines because the template creates a baseline for every Monday within the 30-day expiration period.
* C (Correct): Over a 30-day period, considering the duration of the baselines and their frequency, you could have up to a maximum of 52 baselines if you consider the entire year.
* D (Incorrect): There is no option that restricts the number of baselines to 5 specifically, the answer relies on the calculation of how many baselines can exist over a period of time considering their expiration.
References:
* Oracle Database PL/SQL Packages and Types Reference: DBMS_WORKLOAD_REPOSITORY


NEW QUESTION # 35
A database instance is suffering poor I/O performance on two frequently accessed large tables.
No Big Table caching occurs in the database.
Examine these parameter settings:

Which are two actions either one of which will allow Big Table caching to occur?

  • A. Increasing DB_BIG_TABLE_CACHE_PERCENT_TARGET to at least 25
  • B. Increasing DB_CACHESIZE to 1 G
  • C. Setting DB_KEEP_CACHE_SIZE to at least 50M
  • D. Increasing DB_BIG_TABLE_CACHE_PERCENT_TARGET to at least 50
  • E. Setting PARALLEL_DEGREE_POLICYAUTO
  • F. Setting PARALLEL_DEGREE_POLICYADAPTIVE

Answer: A,B

Explanation:
Big Table caching is a feature that allows frequently accessed large tables to be cached in memory to improve I/O performance. From the parameter settings provided, Big Table caching is not occurring because DB_BIG_TABLE_CACHE_PERCENT_TARGETis set to 10, which is the minimum threshold for enabling the feature, but the size of the cache is too small for the big tables to be effectively cached.
To enable Big Table caching, one of the following actions could be taken:
* C (Correct):IncreasingDB_BIG_TABLE_CACHE_PERCENT_TARGETto at least 25. This action would allocate a larger percentage of the buffer cache for storing big tables, which could allow for caching large tables and thus improve I/O performance.
* D (Correct):IncreasingDB_CACHE_SIZEto 1G. Since the size of the buffer cache is a determining factor for how much data can be cached, increasing this parameter would provide more memory space for big tables to be cached.
Options A, B, E, and F will not enable Big Table caching because:
* A:IncreasingDB_BIG_TABLE_CACHE_PERCENT_TARGETto 50 without adjusting the overall size of the cache might still not be sufficient if theDB_CACHE_SIZEis not large enough to hold the big tables.
* B:SettingDB_KEEP_CACHE_SIZEto at least 50M only specifies a separate buffer pool for objects with the KEEP cache attribute and does not affect Big Table caching.
* E:andF:Changing thePARALLEL_DEGREE_POLICYtoADAPTIVEorAUTOinfluences the behavior of parallel execution but does not directly enable or influence Big Table caching.
References:
* Oracle Database Performance Tuning Guide:Big Table Caching
* Oracle Database Reference:DB_BIG_TABLE_CACHE_PERCENT_TARGET
* Oracle Database Reference:DB_CACHE_SIZE


NEW QUESTION # 36
Which two statements are true about session wait information contained in v$session or v$session_wait?

  • A. Rows for sessions displaying WAITED UNKNOWN TIME in the STATE column indicate that the session is still waiting.
  • B. Rows for sessions that are not waiting might contain the actual wait time for the last event for which they waited.
  • C. Rows for sessions that are not waiting always contain the total wait time since the session started.
  • D. Rows for sessions that are currently waiting have a wait time of 0.
  • E. Rows for sessions that are currently waiting have their wait time incremented every microsecond.

Answer: B,D

Explanation:
In theV$SESSIONview, Oracle provides information about the session waits:
B: When theWAIT_TIMEcolumn has a value of 0, it signifies that the session is currently waiting for a resource. This column represents the duration of the current or last wait.
C: If the session is not actively waiting, theWAIT_TIMEcolumn shows the time the session spent waiting for the last wait event. If theSTATEcolumn is showing "WAITED KNOWN TIME", it means the session is not currently waiting, but it indicates the time for which it had waited.
References:
* Oracle Database Reference, 19c
* Oracle Database Performance Tuning Guide, 19c


NEW QUESTION # 37
Which three statements are true about server-generated alerts?

  • A. They provide notifications but never any suggestions for correcting the identified problems.
  • B. They are notifications from the Oracle Database Server of an existing or impending problem.
  • C. They may contain suggestions for correcting the identified problems.
  • D. Their threshold settings can be modified by using DBMS_SERVER_ALERT.
  • E. They are logged in the alert log.
  • F. They can be viewed only from the Cloud Control Database home page.

Answer: B,C,E

Explanation:
Server-generated alerts in Oracle Database are designed to notify DBAs and other administrators about issues within the database environment. These alerts can be triggered by a variety of conditions, including threshold-based metrics and specific events such as ORA- error messages. Here's how these options align with the statements provided:
* A (True):Server-generated alerts are indeed notifications from the Oracle Database Server that highlight existing or impending issues. These alerts are part of Oracle's proactive management capabilities, designed to inform administrators about potential problems before they escalate.
* C (True):These alerts are logged in the alert log of the Oracle Database. The alert log is a crucial diagnostic tool that records major events and changes in the database, including server-generated alerts.
This log is often the first place DBAs look when troubleshooting database issues.
* F (True):Server-generated alerts may include suggestions for correcting identified problems. Oracle Database often provides actionable advice within these alerts to assist in resolving issues more efficiently. These suggestions can range from adjusting configuration parameters to performing specific maintenance tasks.
Options B, D, and E do not accurately describe server-generated alerts:
* B (False):While the statement might have been true in some contexts, Oracle's server-generated alerts often include corrective suggestions, making this statement incorrect.
* D (False):Server-generated alerts can be viewed from various interfaces, not just the Cloud Control Database home page. They are accessible through Enterprise Manager, SQL Developer, and directly within the database alert log, among other tools.
* E (False):While it's true that threshold settings for some alerts can be modified, the method specified, usingDBMS_SERVER_ALERT, is not correct. Threshold settings are typically adjusted through Enterprise Manager or by modifying specific initialization parameters directly.
References:
* Oracle Database Documentation:Oracle Database 19c: Performance Management and Tuning
* Oracle Base: Alert Log and Trace Files
* Oracle Support:Understanding and Managing Server-Generated Alerts


NEW QUESTION # 38
Which two options are part of a Soft Parse operation?

  • A. Semantic Check
  • B. SQL Optimization
  • C. Shared Pool Memory Allocation
  • D. Syntax Check
  • E. SQL Row Source Generation

Answer: A

Explanation:
During a soft parse, Oracle checks the shared SQL area to see if an incoming SQL statement matches one already in the shared pool. This operation includes syntax and semantic checks. The syntax check ensures the statement is properly formed, and the semantic check confirms that all the objects referenced in the SQL statement exist and that the user has the necessary privileges to access them.References:
* Oracle Database Concepts, 19c
* Oracle Database SQL Tuning Guide, 19c


NEW QUESTION # 39
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