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Oracle Database 19c Performance and Tuning Management Sample Questions (Q33-Q38):

NEW QUESTION # 33
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: HW - contention
D. enq: TX - allocate ITL entry

Answer: C

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 # 34
Which two options are part of a Soft Parse operation?

A. Semantic Check
B. Syntax Check
C. Shared Pool Memory Allocation
D. SQL Optimization
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 # 35
Which two statements are true about space usage in temporary tablespaces?

A. When a global temporary table instantiation is too large to fit in memory, space is allocated in a temporary tablespace.
B. When a session consumes all temporary tablespace storage, then the session would hang until the temporary space used by that session is cleared.
C. Temporary tablespaces setting Includes quotas to limit temporary space used by a session for that 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: A,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 # 36
Examine this statement and its corresponding execution plan:

Which phase introduces the CONCATENATION step?

A. SQL Semantic Check
B. SQL Execution
C. SQL Transformation
D. SQL Adaptive Execution
E. SQL Row Source Generation

Answer: C

Explanation:
The CONCATENATION step in an execution plan is introduced during the SQL Transformation phase. This phase is part of the optimizer's query transformations which can include various techniques to rewrite the query for more efficient execution. The CONCATENATION operation is used to combine the results of two separate SQL operations, typically when there is an OR condition in the WHERE clause, as seen in the provided query.
References:
* Oracle Database SQL Tuning Guide, 19c
* Oracle Database Concepts, 19c

NEW QUESTION # 37
Which two options are part of a Soft Parse operation?

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

Answer: A

NEW QUESTION # 38
......

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