VCE 1Z0-084 FREE - 1Z0-084 NEW BRAINDUMPS PDF

Vce 1Z0-084 Free - 1Z0-084 New Braindumps Pdf

Vce 1Z0-084 Free - 1Z0-084 New Braindumps Pdf

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Oracle 1Z0-084 certification exam consists of 75 multiple-choice questions that must be answered in 120 minutes. 1Z0-084 exam is computer-based and can be taken at authorized testing centers worldwide. Candidates must score at least 63% to pass the exam and earn the certification. 1Z0-084 exam fee is $245 USD, and candidates can register for the exam on the Oracle website.

Oracle 1Z0-084 certification exam is an excellent opportunity for professionals to enhance their skills and knowledge in performance tuning and management of Oracle Database 19c. It is a valuable certification that can help them to advance their career in database administration. 1Z0-084 Exam covers various topics that are essential for professionals working in this field, and passing it can increase their credibility and marketability.

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Oracle Database 19c Performance and Tuning Management Sample Questions (Q44-Q49):

NEW QUESTION # 44
A Standard Edition production database has performance problems for two hours on the same day each week.
Which tool must you use to diagnose the problem?

  • A. AWR Compare Periods report
  • B. Statspack report
  • C. Database Replay
  • D. SQL Performance Analyzer

Answer: B

Explanation:
For a Standard Edition production database, the Statspack tool is available to diagnose performance problems.
The Automatic Workload Repository (AWR) and its related tools like AWR Compare Periods report and SQL Performance Analyzer are features of the Oracle Database Enterprise Edition and are not available in Standard Edition. Database Replay is also a feature of the Enterprise Edition. Statspack is a performance diagnostic tool provided for earlier versions and Standard Editions of the Oracle Database to collect, store, and analyze performance data.
References
* Oracle Database 19c Administrator's Guide - Using Statspack to Diagnose Database Performance Issues


NEW QUESTION # 45
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. Both the RECYCLE and KEEP buffer caches should always have a very high cache hit ratio.
  • B. A 99% cache hit ratio can be observed for database instances which have very poor I/O performance.
  • C. The performance of workloads that primarily generate full table scans and fast full index scans are always affected by the cache hit ratio.
  • D. A 60% cache hit ratio can be observed for database instances which have very good I/O performance.
  • E. The buffer cache advisory view v$db_cache_advice provides advice on cache hit ratios appropriate for the instance workload.

Answer: B,E


NEW QUESTION # 46
Which two types of performance problems are reported by ADDM for PDBS?

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

Answer: C,E

Explanation:
ADDM (Automatic Database Diagnostic Monitor) is a key Oracle diagnostic tool that analyzes performance data captured by AWR (Automatic Workload Repository) and provides insights into performance issues. In a PDB (Pluggable Database), ADDM can provide recommendations for various types of performance issues.
Why A. I/O capacity limits is correct:
* ADDM evaluates the performance of a database and identifies I/O bottlenecks that could be impacting query performance.
* I/O capacity limits occur when the database cannot handle the I/O workload effectively, which could be due to disk contention, inadequate I/O throughput, or hardware limitations.
* ADDM reports such issues and suggests remedies like tuning SQL queries, redistributing I/O workloads, or upgrading storage systems.
Why D. Top SQL statements is correct:
* One of the critical capabilities of ADDM is identifying high-resource-consuming SQL statements (Top SQL) that are impacting database performance.
* For PDBs, ADDM provides specific recommendations to optimize these SQL statements, such as improving execution plans, adding indexes, or rewriting queries.
Why Other Options Are Incorrect:
* B. Excessive checkpoint writes:
* While excessive checkpoint writes can occur, ADDM typically focuses on higher-level performance problems like I/O issues or top SQL rather than specific low-level operational events like checkpointing. Excessive checkpoint writes are not commonly reported directly for PDBs by ADDM.
* C. SGA sizing issues:
* ADDM does not directly analyze or provide recommendations for SGA (System Global Area) sizing issues at the PDB level because SGA is managed at the CDB (Container Database) level.
PDBs share the SGA of the CDB.
* E. User I/O waits:
* While user I/O waits are captured in performance metrics, ADDM typically groups them under broader issues like I/O capacity limits. It does not specifically report on "user I/O waits" as a standalone problem.
Key Features of ADDM for PDBs:
* Identifying Top SQL Statements impacting performance.
* Reporting I/O issues, including capacity limits and contention.
* Highlighting inter-PDB resource contention within the same CDB.
References to Oracle Documentation:
* Oracle Database 19c Performance Tuning Guide:
* Section: Using ADDM for Pluggable Databases.
* Details the types of performance issues ADDM reports for PDBs.
* Automatic Database Diagnostic Monitor (ADDM) Concepts:
* Highlights ADDM's ability to analyze I/O, SQL performance, and resource utilization.


NEW QUESTION # 47
Which three types of statistics are captured by statspack with snap level 6?

  • A. Parent and child latches
  • B. Segment-level statistics
  • C. Parent and child latches
  • D. Optimizer execution plans
  • E. Plan usage data
  • F. Enqueue statistics

Answer: A,B,F

Explanation:
Statspack is a performance diagnostic tool provided by Oracle prior to the introduction of the Automatic Workload Repository (AWR). At snap level 6, Statspack captures the following types of statistics:
* A (Correct):Parent and child latches are captured. Latch statistics provide information about contention for latches, which are low-level serialization mechanisms used by Oracle.
* E (Correct):Enqueue statistics, which provide information on the waits for locks that manage the concurrency between users.
* F (Correct):Segment-level statistics, which provide detailed information on database segments such as tables, indexes, etc., to identify I/O and contention issues.
* C (Incorrect):While optimizer execution plans are an essential aspect of performance tuning, detailed execution plan capture is not part of the Statspack report at level 6.
* D (Incorrect):Plan usage data refers to how frequently a plan is being used, which is more associated with AWR and not typically captured in Statspack reports.
References:
* Oracle Database Performance Tuning Guide:Using Statspack


NEW QUESTION # 48
Which two options are part of a Soft Parse operation?

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

Answer: C

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 # 49
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