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Oracle Database 19c Performance and Tuning Management Sample Questions (Q32-Q37):
NEW QUESTION # 32
Examine this statement and output:
Which three statements are true?
- A. Session 8779 may be waiting due to a network problem.
- B. Both 9822 and 8779 sessions are waiting for operating system resources.
- C. Session 9857 is not waiting.
- D. Session 9857 waited 1354 seconds for another process, which was also waiting for a transaction to end.
- E. Session 9822 will always stop waiting if the session that owns the TX enqueue issues a COMMIT statement as session 9822 is the first session in the transaction queue.
- F. Session 8779 may be waiting for a user or application response.
Answer: A,E,F
Explanation:
For this SQL statement and output, we can analyze theEVENTcolumn to understand the type of wait:
B: The event "SQL*Net message from client" typically indicates that the session is waiting for a response from the client. This can be due to a network issue, user response, or an application processing delay.
E: The event "SQL*Net message from client" also implies that the session is idle waiting for the client (a user or an application) to send a request to the server. This event usually indicates that the session is not actively working but is instead waiting for the next command.
F: The wait event "enq: TX - row lock contention" suggests that session 9822 is waiting for a row-level lock held by another session. If the holding session issues a COMMIT or ROLLBACK, the lock will be released, and session 9822 will stop waiting. Since this session is experiencing row lock contention, it implies it's waiting for a specific transaction to complete.
References:
* Oracle Database Reference, 19c
* Oracle Wait Events Documentation
NEW QUESTION # 33
Which two statements are true about the use and monitoring of Buffer Cache Hit ratios and their value in tuning Database I/O performance?
- A. The performance of workloads that primarily generate full table scans and fast full index scans are always affected by the cache hit ratio.
- B. A 99% cache hit ratio can be observed for database instances which have very poor I/O performance.
- C. A 60% cache hit ratio can be observed for database instances which have very good I/O performance.
- D. Both the RECYCLE and KEEP buffer caches should always have a very high cache hit ratio.
- E. The buffer cache advisory view v$db_cache_advice provides advice on cache hit ratios appropriate for the instance workload.
Answer: B,E
Explanation:
A high buffer cache hit ratio typically indicates that the database is effectively using the buffer cache and does not often need to read data from disk. However, this metric alone is not a reliable indicator of the I/O performance of the database for several reasons:
* Full table scans and fast full index scans (A) can bypass the buffer cache by design if the blocks are not
* deemed reusable shortly, which can impact the cache hit ratio.
* A high cache hit ratio (B) can be misleading if the database performance is poor due to other factors, such as inefficient queries or contention issues.
* The buffer cache advisory (C) is a more valuable tool for understanding the potential impact of different cache sizes on the database's I/O performance. It simulates scenarios with different cache sizes and provides a more targeted recommendation.
* The RECYCLE and KEEP buffer caches (D) are specialized caches designed for certain scenarios.
While high hit ratios can be beneficial, they are not universally required; some workloads might not be significantly impacted by lower hit ratios in these caches.
* A lower cache hit ratio (E) does not necessarily mean poor I/O performance. In some cases, a system with a well-designed storage subsystem and efficient queries might perform well even with a lower cache hit ratio.
References
* Oracle Database 19c Performance Tuning Guide - Buffer Cache Hit Ratio
* Oracle Database 19c Performance Tuning Guide - v$db_cache_advice
NEW QUESTION # 34
Which procedure gathers statistics that are always used in the generation of any execution plan?
- A. DBMS_STATS.GATHER_SYSTEM_STATS
- B. DBMS_STATS.GATHER_FIXED_ OBJECTS_STATS
- C. DBMS_STATS.GATHER_DATABASE_STATS
- D. DBMS_STATS.GATHER_DICTIONARY_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 # 35
Users complain about slowness and session interruptions. Additional checks reveal the following error in the application log:
Which file has additional information about this error?
- A. ASH report
- B. SQL trace file automatically generated by the error
- C. Session trace file SQL trace file automatically generated by the error
- D. Alert log
Answer: D
Explanation:
When an ORA-00060 deadlock error occurs, detailed information about the error and the deadlock graph are dumped into the alert log. This log contains a trace file name that you can use to find additional detailed information about the sessions involved in the deadlock and the SQL statements they were executing.
References:
* Oracle Database Administrator's Guide, 19c
* Oracle Database Error Messages, 19c
NEW QUESTION # 36
Which two actions can cause invalidation or loss of one or more results in the SQL Query Result Cache?
- A. One or more results were aged out of the result cache.
- B. A request was made by the RCBG background of a non-RAC database.
- C. result_cache_max_size is set dynamically to 0.
- D. A request was made by the RCBG background process in a physical standby database that is opened read only and whose primary has a result cache.
- E. Decreasing the value set for RESULT_CACHE_REMOTE_EXPIRATION.
Answer: A,C
Explanation:
The SQL Query Result Cache stores the results of queries and PL/SQL function calls for reuse. However, entries in the result cache can be invalidated or lost under certain conditions:
A: Results can be aged out of the cache when the cache becomes full and new results need to be stored. This process ensures that the cache does not exceed its allocated memory and that it contains the most recently used entries.
B: Setting theRESULT_CACHE_MAX_SIZEparameter to 0 will effectively disable the result cache and all cached results will be lost, as Oracle will no longer allocate any memory to the result cache.
References:
* Oracle Database Performance Tuning Guide, 19c
NEW QUESTION # 37
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