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

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

True

False

2 / 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

3 / 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

4 / 20

How do you see the trace files?

v$mystat

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

v$librarycache

using v$sysstat

5 / 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

6 / 20

What are the two types of optimizers?

Search Engine Optimizer and Cost-Based Optimizer

Rule-Based Optimizer and Search Engine Optimizer

Rule-Based Optimizer and Cost-Based Optimizer

Control-Based Optimizer and RAM-Based Optimizer

7 / 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

8 / 20

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

True

False

9 / 20

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

True

False

10 / 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

11 / 20

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

True

False

12 / 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

13 / 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

14 / 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

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

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

17 / 20

While configuring the snapshot data capture for your database, you have specified the snapshot level setting as 6.Which statistics would be captured by the Statspack report?

Memory statistics

Resource limit

Optimizer execution plans

All of the above

18 / 20

Which of the following is not an index scanning method.

INDEX FULL SCAN:

INDEX UNIQUE SCAN:

INDEX CREATE SCAN:

INDEX RANGE SCAN:

19 / 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

20 / 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

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!