USEFUL BOOKS 1Z0-084 PDF - ONLY IN DUMPSMATERIALS

Useful Books 1Z0-084 PDF - Only in DumpsMaterials

Useful Books 1Z0-084 PDF - Only in DumpsMaterials

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Oracle 1Z0-084 Certification Exam is an excellent way for database professionals to demonstrate their expertise in performance and tuning management. By passing 1Z0-084 exam, candidates can prove to potential employers that they possess the knowledge and skills needed to manage and optimize Oracle Database 19c performance. Additionally, earning this certification can lead to career advancement opportunities and higher salaries.

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Oracle 1Z0-084 Exam is divided into four main sections that cover a wide range of topics. The first section, Oracle Database Performance Tuning Concepts, covers the basics of Oracle Database 19c performance tuning architecture, memory, and storage management. The second section, Database Resource Management, covers topics such as the automatic database diagnostic monitor, Oracle database time model, and the Resource Manager.

Oracle Database 19c Performance and Tuning Management Sample Questions (Q24-Q29):

NEW QUESTION # 24
Database performance degraded between 23:15 and 23:30 for the last three nights. The awr snapshot interval is one hour. The AODM report contains nothing about this performance problem.
With which tool can you further analyze this problem?

  • A. SQL Tuning Advisor
  • B. AWR Compare Periods report
  • C. Active Session History report
  • D. SQL Performance Analyzer

Answer: C

Explanation:
The Active Session History (ASH) report is a tool that provides detailed information about active sessions for the time period specified. Since the AWR snapshot interval is one hour and does not capture the granularity needed for this issue, ASH reports aremore suitable as they contain more granular data for sessions that were active during the period of interest.
References:
* Oracle Database Performance Tuning Guide, 19c


NEW QUESTION # 25
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. Alert log
  • D. Session trace file SQL trace file automatically generated by the error

Answer: C

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 # 26
Which two types of performance problems are reported by ADDM for PDBS?

  • A. I/O capacity limits
  • B. Top SQL statements
  • C. SGA sizing issues
  • D. Excessive checkpoint writes
  • E. User I/O waits

Answer: A,E

Explanation:
The Automatic Database Diagnostic Monitor (ADDM) analyzes and reports on various types of performance problems. For Pluggable Databases (PDBs), it can identify issues such as I/O capacity limits which may hinder the overall performance by causing bottlenecks. Additionally, ADDM can report on user I/O waits, which can indicate performance issues related to the time it takes for user queries to read data from the disk.
References:
* Oracle Multitenant Administrator's Guide, 19c
* Oracle Database Performance Tuning Guide, 19c


NEW QUESTION # 27
You must write a statement that returns the ten most recent sales. Examine this statement:

Users complain that the query executes too slowly. Examine the statement's current execution plan:

What must you do to reduce the execution time and why?

  • A. Create an index on SALES.CUST_ID to force an INDEX RANGE SCAN on this index followed by a NESTED LOOP join between CUSTOMERS and SALES.
  • B. Collect a new set of statistics on PRODUCT, CUSTOMERS, and SALES because the current stats are inaccurate.
  • C. Create an index on SALES.TIME_ID to force the return of rows in the order specified by the ORDER BY clause.
  • D. Enable Adaptive Plans so that Oracle can change the Join method as well as the Join order for this query.
  • E. Replace the FETCH FIRST clause with ROWNUM to enable the use of an index on SALES.

Answer: C

Explanation:
The execution plan shows a full table access for theSALEStable. To reduce the execution time, creating an index onSALES.TIME_IDwould be beneficial as it would allow the database to quickly sort and retrieve the most recent sales without the need to perform a full table scan, which is I/O intensive and slower. By indexing TIME_ID, which is used in theORDER BYclause, the optimizer can take advantage of the index to efficiently sort and limit the result set to the ten most recent sales.
* B (Incorrect):ReplacingFETCH FIRSTwithROWNUMwould not necessarily improve the performance unless there is an appropriate index that the optimizer can use to avoid sorting the entire result set.
* C (Incorrect):There is no indication that the current statistics are inaccurate; hence, collecting new statistics may not lead to performance improvement.
* D (Incorrect):While adaptive plans can provide performance benefits by allowing the optimizer to adapt the execution strategy, the main issue here is the lack of an index on theORDER BYcolumn.
* E (Incorrect):Creating an index onSALES.CUST_IDcould improve join performance but would not address the performance issue caused by the lack of an index on theORDER BYcolumn.
References:
* Oracle Database SQL Tuning Guide:Managing Indexes
* Oracle Database SQL Tuning Guide:Using Indexes and Clusters


NEW QUESTION # 28
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. Lack of temporary tablespace space for sort operations can be prevented by using temporary tablespace groups.
  • C. When a global temporary table instantiation is too large to fit in memory, space is allocated in a temporary tablespace.
  • D. Temporary tablespaces setting Includes quotas to limit temporary space used by a session for that Temporary tablespace.
  • E. 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.

Answer: B,C

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 # 29
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