Oracle Performance Tuning Techniques: Expert-Level Quiz

Oracle Performance Tuning Techniques Quiz

Welcome to the "Oracle Performance Tuning Techniques" quiz! This quiz aims to enhance your understanding of optimizing Oracle Database performance. You’ll explore techniques for improving query execution, resource management, and response times, covering topics like indexing strategies and execution plan analysis. Whether you’re preparing for a database role or looking to refine your skills, this quiz is a great opportunity to assess and expand your expertise. Let’s get started!

1 / 20

Which of the following is an important feature of relational databases and SQL?

Powerful GUI front-end

Independence of table relationships

Easy to install and use

High speed of SQL

2 / 20

Which statements are true about performance analysis by SQL Performance Analyzer?

It produces results that can be used to create the SQL plan baseline.

It generates recommendations to run SQL Tuning Advisor to tune regressed SQL statements.

It detects changes in SQL execution plans

All of the above

3 / 20

Which of the following is not an index scanning method.

INDEX FULL SCAN:

INDEX UNIQUE SCAN:

INDEX CREATE SCAN:

INDEX RANGE SCAN:

4 / 20

In which scenarios would you recommend using RAID level 5 as an option for database storage?

For a database in which performance is the primary goal of the database because applications are demanding in terms of I/O operations

For a database with lower recovery (MTTR) overhead

For a database in which the applications primarily perform read operations and predominantly sequential I/O is performed

None of the above

5 / 20

During a proactive database performance monitoring routine, on examining the AWR report you find that log file sync appears among the top 5 wait events. What does this event indicate?

Frequent commits or rollbacks are taking place in the application

Frequent logfile switches are occurring

Frequent incremental checkpoints are taking place in the database.

Redo is generated faster than LGWR can write it out

6 / 20

What indicates that the rate of writing data blocks to the disk is very slow?

Very high cache-hit ratio

Increasing number of buffer busy waits

Waits on latch: cache buffers chains event

Increasing number of free buffer waits

7 / 20

In which case is the database buffer cache NOT used?

When the database writer process writes to the SYSTEM tablespace

When the server process writes sort data to the temporary tablespace

When physical I/Os are performed to read from data files

When the database writer process writes undo data to the undo tablespace

8 / 20

What areas of Oracle tuning have the most impact on system performance?

Physical design tuning

SGA tuning

Logical design tuning

SQL tuning

9 / 20

Which of the following is not a type of tuning?

Fine Tuning

Memory Tuning

Application Tuning

Database Tuning

10 / 20

Optimizer is a mechanism that will make the execution plan of an SQL statement. True or False?

True

False

11 / 20

Identify the correct statement about the Active Session History (ASH) data.

All ASH data in memory are flushed to disk by MMNL process whenever the buffer is full.

All ASH data in memory are flushed to disk by MMON in every 3 seconds.

A part of SGA memory is used to store ASH data as rolling buffer.

None of the above

12 / 20

Identify the reason why chained or migrated rows in a table cause performance degradation when you access them.

Because it is not possible to use indexes to retrieve these rows

Because the ROWID changes for these rows

Because these rows make existing indexes invalid

Because retrieving these rows requires more than one data block to be accessed

13 / 20

How do you see the trace files?

v$mystat

using tkprof — usage: tkprof allllle.trc llkld.txt

v$librarycache

using v$sysstat

14 / 20

Oracle has introduced a flashback technology to recover the past states of database objects. True or False?

True

False

15 / 20

How do you get the index of a table and on which column the index is?

cursor_sharing=force

by going v$session_longops

dba_indexes and dba_ind_columns

alter system flush shared_pool

16 / 20

Primary key constraint can contain null value, But Unique key constraints should be not null. True or False?

True

False

17 / 20

Rebuilding an index never has an influence on the clustering factor but instead requires a table re-organization. True or False?

True

False

18 / 20

Why is searching for large-table full-table scans critical to SQL tuning?

The full-table scan should be normalized from the database design

A full-table scan is always sub-optimal

They indicate an optimized execution plan

They may be able to be tuned to use an index

19 / 20

Which of the following is not an important Oracle tuning metric?

Library cache hit ratio

Buffer busy waits

Full-table scans

Buffer hit ratio

20 / 20

Which of the following is an important consideration when tuning an SQL statement?

The quality of the SQL optimization

The number of CPUs on the server

The use of bitmap indexes

The degree of parallelism on the tables

Your score is

The average score is 0%

Oracle performance tuning techniques focus on optimizing the performance of Oracle databases. This involves identifying and resolving bottlenecks in query execution, optimizing SQL statements, and efficiently managing database resources like memory, CPU, and storage.

Key techniques include using indexes effectively to analyze execution plans, adjust database parameters, and implement partitioning and parallel process strategies.

This quiz should help you test your Oracle performance tuning techniques.

Good luck!