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

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

Physical design tuning

SGA tuning

Logical design tuning

SQL tuning

3 / 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

4 / 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

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

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

7 / 20

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

True

False

8 / 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

9 / 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

10 / 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

11 / 20

How do you see the trace files?

v$mystat

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

v$librarycache

using v$sysstat

12 / 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

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

Which of the following is not a type of tuning?

Fine Tuning

Memory Tuning

Application Tuning

Database Tuning

15 / 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

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

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

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

19 / 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

20 / 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

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!