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Database Performance and Tuning Essentials 2015

Question No: 21

Which functionality should be used to recommend materialized views and view logs, indexes, SQL profiles,and partitions for a specific workload use?

  1. SQL Performance Analyzer

  2. Top SQL

  3. SQL Tuning Advisor

  4. SQL Access Advisor

  5. Workload Advisor

Answer: D

Reference: http://docs.oracle.com/cd/E25054_01/fusionapps.1111/e14496/monitor_db.htm (12.2.4.5 Using SQL Access Advisor)

Question No: 22

To analyze all database instances in an Oracle Real Application Cluster, in which mode would you run Automatic Database Diagnostic Monitor?

  1. INSTANCE

  2. DATABASE

  3. FULL

  4. CLUSTER

  5. PARTIAL

  6. ALL

Answer: A

Reference: http://docs.oracle.com/cd/E25178_01/server.1111/e16638/diag.htm

Question No: 23

Which are two characteristics of “invisible” index functionality that would help tune a database having thousands of legacy indexes?

  1. An invisible index is ignored by the optimizer.

  2. After an index becomes invisible, it is no longer maintained during insertsand updates.

  3. I/O bottlenecks are easy to spot when invisible indexes are used.

  4. An index only needs to be rebuilt for it to be visible again.

  5. The session or system parameter needs to be changed toOPTIMIZER_USE_INVISIBLE_INDEXEStoTRUEfor an invisible index to become visible to the Optimizer.

Answer: A,E

Question No: 24

Which is used to preserve SQL execution plans of existing statements when moving from one version of the database to another?

  1. SQLHints

  2. Stored Outlines

  3. Stored Profiles

  4. SQL Plan Management

  5. SQL Profiles

Answer: C Explanation:

SQL statement, or migrate an existing stored outline by loading the quot;outlinedquot; plan as a fixed plan.

Reference: https://docs.oracle.com/cd/E18283_01/server.112/e16638/optplanmgmt.htm

Question No: 25

Which are two kinds of statistics collected and processed by the Automatic Workload Repository (AWR) you would utilize when tuning an Oracle Database instance?

  1. Wait Event statistics

  2. Session and System statistics

  3. User privileges statistics

  4. Standby Database throughput statistics

  5. Interconnect statistics

Answer: A,D

Reference: https://docs.oracle.com/cd/E11882_01/server.112/e41573/autostat.htm#PFGRF027

Question No: 26

An Oracle Database customer#39;s VP of Development mentions that they#39;ve moved to AGILE development methodology and DevOps requires an ability to view, test, or validate performance in their own development environment. Which two do you implement?

  1. Oracle Application Infrastructure Tester

  2. Oracle Application Testing Suite

  3. SQL Developer

  4. Oracle Real Application Testing

  5. APEX and SQL Developer

  6. Oracle Testing Pack

Answer: B,D

Question No: 27

What are three reasons an implementation of an Oracle Database Performance and Tuning solution is superior to that of scripts or third-party tools?

  1. It is a part of the database, which means no added installations, configurations, extra user accounts,privilege granting, etc.

  2. It eliminates the need to reverify compatibility, upgrade third-party tools, or rewrite scripts after a patch ordatabase upgrade.

  3. It has the largest library of custom scripts and procedures and includes an assembly builder to maintainthem and add more.

  4. Results come from the Oracle Database Optimizer and not rules or heuristics trying to predict what theoptimizer may do.

  5. It is the most inexpensive tool in the market.

Answer: B,D,E

Question No: 28

For which two capabilities would you implement Segment Advisor in order to aid a customer trying to find and fix performance issues related to database space?

  1. to determine if objects have unusedspace that can be released

  2. to advise if materialized views can be used to reduce size of views

  3. to review space usage of individual schema objects or tablespaces

  4. to advise if there are any duplicate indexes and automate their removal

  5. to identify any fragmentation in the database cache or swap space

Answer: A,C

Question No: 29

Upon migration to Oracle Database 12c, a customer asked that monitoring at an individualdatabase level be disabled in favor of database performance monitoring consolidated and centralized across their enterprise.

Which are two actions you would take to meet the customer#39;s requirements?

  1. Disable Oracle Enterprise Manager Database Express by setting the HTTP Port to 0.

  2. For the always active Oracle Enterprise Manager Database Express process, create a script that willdisable that process upon database boot.

  3. Using the appropriate architectureimplement Oracle Enterprise Manager.

  4. Delete the “express” directory in Oracle Home to disable Oracle Enterprise Manager Database Express.

  5. Changes permissions of the “express” directory to real only by root.

  6. Enable SNMP and configure MIBS on each databaseand forward database monitoring SNMP traps.

Answer: B,E

Question No: 30

As of Oracle Database 12c, which functionality to access database diagnostic and performance has been superseded by Oracle Enterprise Manager Database Express?

  1. SQL Developer

  2. SQL Plus

  3. Database console

  4. SQL Express

  5. Grid Control

Answer: C

Reference: http://dbaora.com/enterprise-manager-database-express-oracle-database-12c- release-1-12-1/

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