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Oracle Database 19c Performance and Tuning Management Sample Questions (Q46-Q51):

NEW QUESTION # 46
Which two options are part of a Soft Parse operation?

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

Answer: A

NEW QUESTION # 47
Which two statements are true about cursor sharing?

A. Setting cursor_sharing to EXACT prevents Adaptive Cursor Sharing from being used.
B. Adaptive Cursor Sharing guarantees that a suboptimal plan will never be used on any execution of a SQL statement.
C. Adaptive Cursor Sharing requires histograms on filtered columns, used in equality predicates, to allow different execution plans to be generated for statements whose bound values would normally generate different plans at hard parse time.
D. Setting optimizer_capture_sql_plan_baselines to TRUE loads all adaptive plans for the same statement into the cursor cache.
E. Setting Cursor_sharing to FORCE can result in a plan that is suboptimal for the majority of values bound to a bind variable when executing a cursor with one or more bind variables.

Answer: A,E

Explanation:
A: WhenCursor_sharingis set toFORCE, Oracle tries to avoid hard parses by replacing literals in SQL statements with bind variables, even if the original statement didn't include bind variables. This can lead to the use of a single execution plan for multiple executions of a statement with different literal values, which might not be optimal for all executions.
D: Settingcursor_sharingtoEXACTensures that SQL statements must match exactly for them to share a cursor. This setting prevents the use of Adaptive Cursor Sharing (ACS) since ACS relies on the ability to share cursors among similar statements that differ only in their literal values. WithEXACT, there's no cursor sharing for statements with different literals, hence no opportunity for ACS to operate.
References:
* Oracle Database SQL Tuning Guide, 19c
* Oracle Database Reference, 19c

NEW QUESTION # 48
Which three statements are true about server-generated alerts?

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

Answer: A,B,C

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 # 49
Which statement is true about DB time in V$$YS_TIME_MODEL?

A. DB time is organized as a simple list of statistics and any time period is attributable to only one statistic.
B. DB time can be many times greater than the elapsed time since the database instance started.
C. DB tine excludes the time spent waiting for a CPU in the operating system run queue.
D. DB time includes the time spent executing the RMAN backup and restore command.

Answer: B

Explanation:
DB time includes the time spent on user and background processes. It can be greater than the elapsed time because it accumulates the active time of all the processes. For example, if two sessions are each active for 2 seconds at the same time, DB time would accumulate 4 seconds, while the elapsed time would be only 2 seconds.References:
* Oracle Database Performance Tuning Guide, 19c
* Oracle Database Reference, 19c

NEW QUESTION # 50
Which two statements are true about session wait information contained in v$session or v$session_wait?

A. Rows for sessions that are not waiting always contain the total wait time since the session started.
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 displaying WAITED UNKNOWN TIME in the STATE column indicate that the session is still waiting.
D. Rows for sessions that are currently waiting have their wait time incremented every microsecond.
E. Rows for sessions that are currently waiting have a wait time of 0.

Answer: B,E

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 # 51
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