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

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

True

False

2 / 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

3 / 20

Which of the following is not a type of tuning?

Fine Tuning

Memory Tuning

Application Tuning

Database Tuning

4 / 20

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

True

False

5 / 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

6 / 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

7 / 20

Which of the following tuning techniques will NOT reduce the disk I/O for an Oracle query?

Created a clustered table

Run parallel query against the table

Add blocks to the SGA buffer pool

Create tables with redundant columns from other tables

8 / 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

9 / 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

10 / 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

11 / 20

Which of the following database design features is most important to SQL performance?

The introduction of non-first normal form relations

The introduction of SQL*Plus

Removal of data redundancy

The introduction of data redundancy

12 / 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

13 / 20

Which of the following is not an index scanning method.

INDEX FULL SCAN:

INDEX UNIQUE SCAN:

INDEX CREATE SCAN:

INDEX RANGE SCAN:

14 / 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

15 / 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

16 / 20

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

True

False

17 / 20

You analyze an Automatic Database Diagnostic Monitor (ADDM) report to identify the component that contributes most to the database time. Which is the correct description of database time?

It is the time spent in processing the input/output (I/O) request by users

It is the difference between the wait time and the CPU time of all nonidle sessions

It is the sum of wait time and the CPU time of all nonidle sessions

It is the sum of the CPU time of all nonidle sessions

18 / 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

19 / 20

What best describes the relationship between indexes and SQL performance?

Indexes are used to make table storage more efficient

Indexes exist solely to improve query speed

Indexes rarely make a difference in SQL performance

Indexes are only used in special cases

20 / 20

All else being equal, which of the following tuning tasks is least likely to provide an improvement in performance?

Moving Oracle data files from hot disks onto cool disks

Eliminating full-table scans from SQL queries

Adding additional storage to the SGA shared pool

De-normalization of the logical 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!