Database Performance Tuning: Enhance Database Efficiency

Question 1

Which of the following is NOT an advantage of using an index in a database?

Accepted Answer

Increased data redundancy

Answer

Faster data retrieval

Answer

Improved query performance

Answer

Reduced storage space

Question 2

What is the key purpose of a clustered index?

Accepted Answer

To organize related data physically on disk for faster retrieval

Answer

To accelerate queries on frequently accessed columns

Answer

To ensure data integrity by enforcing unique values

Answer

To minimize the size of the database file

Question 3

Which database performance tuning technique involves modifying SQL queries to enhance their efficiency?

Accepted Answer

Query optimization

Answer

Indexing

Answer

Hardware upgrades

Answer

Data denormalization

Question 4

What is the primary role of a database buffer pool?

Accepted Answer

To store frequently accessed data in memory for faster access

Answer

To manage concurrent user access to the database

Answer

To log all database transactions

Answer

To ensure data integrity by performing regular backups

Question 5

What is the primary goal of database performance tuning?

Accepted Answer

To reduce query response times and enhance overall database efficiency

Answer

To minimize hardware costs associated with database operation

Answer

To ensure the confidentiality and integrity of sensitive data

Answer

To maximize the storage capacity of the database

Question 6

What is the primary responsibility of a database performance tuning specialist?

Accepted Answer

Optimizing database systems to achieve maximum performance and efficiency

Answer

Designing and implementing new database systems from scratch

Answer

Maintaining and troubleshooting database systems to ensure smooth operation

Answer

Training users on database management software and its functionalities

Question 7

Which concurrency control mechanism guarantees the highest level of isolation, ensuring that transactions are executed as if they were run one at a time?

Accepted Answer

Serializable

Answer

Read Uncommitted

Answer

Read Committed

Answer

Repeatable Read

Question 8

What is the primary purpose of creating an index on a database table?

Accepted Answer

To accelerate data retrieval

Answer

To guarantee data integrity

Answer

To minimize storage space

Answer

To enhance data security

Question 9

Which optimization technique involves reducing the amount of data processed by a query?

Accepted Answer

Query filtering

Answer

Indexing

Answer

Caching

Answer

Data partitioning

Question 10

Which transaction isolation level prioritizes data consistency over speed?

Accepted Answer

Serializable Isolation

Answer

Read Committed Isolation

Answer

Optimistic Concurrency Control

Question 11

What is the primary function of a database performance tuning advisor?

Accepted Answer

Analyze query performance and suggest optimizations

Answer

Create database backups and restore data

Answer

Manage user access to the database

Answer

Monitor database health and send alerts

Question 12

What are the two primary categories of database indexes?

Accepted Answer

Clustered and non-clustered

Answer

Primary and foreign

Answer

Unique and non-unique

Answer

Hash and B-tree

Question 13

Explain the difference between a clustered index and a non-clustered index.

Accepted Answer

A clustered index physically organizes the data in the table, while a non-clustered index only creates a logical index.

Answer

A non-clustered index physically organizes the data in the table, while a clustered index only creates a logical index.

Answer

A clustered index is always created on the primary key, while a non-clustered index can be created on any column.

Answer

A non-clustered index is always created on the primary key, while a clustered index can be created on any column.

Question 14

Describe the primary role of a database performance tuning expert.

Accepted Answer

Identify and resolve performance issues within database systems

Answer

Design and implement database systems

Answer

Manage user accounts and permissions

Answer

Provide technical support to database users

Question 15

Which indexing technique is most suitable for optimizing queries that include a WHERE clause condition on a specific column?

Accepted Answer

B-tree index

Answer

Clustered index

Answer

Hash index

Answer

Bitmap index

Question 16

Which query optimization technique involves decomposing complex queries into simpler, more efficient ones?

Accepted Answer

Query decomposition

Answer

Index utilization

Answer

Cache optimization

Answer

Data partitioning

Question 17

Identify a potential disadvantage of using clustered indexes:

Accepted Answer

Slower data insertion and deletion operations

Answer

Increased data fragmentation

Answer

Limited index cardinality

Answer

Higher memory consumption

Question 18

Which technique involves splitting data into smaller, manageable units to optimize performance?

Accepted Answer

Data partitioning

Answer

Query parallelization

Answer

Index optimization

Answer

Database normalization

Question 19

What is the fundamental goal of database performance tuning?

Accepted Answer

Minimizing query execution time

Answer

Ensuring data accuracy

Answer

Maintaining data confidentiality

Answer

Optimizing storage utilization

Question 20

Which of the following is NOT a primary type of database monitoring tool?

Accepted Answer

Configuration management tools

Answer

Query analyzers

Answer

Performance dashboards

Answer

Transaction logs

Question 21

For optimal database performance, which action is essential?

Accepted Answer

Regular Index Maintenance

Answer

Frequent Hardware Upgrades

Answer

Periodic Database Rebuilds

Answer

Data Denormalization

Question 22

How do query optimization techniques enhance database performance in real-world applications?

Accepted Answer

Minimize disk accesses for data retrieval.

Answer

Eliminate the need for indexing.

Answer

Speed up data insertion and deletion.

Answer

Reduce memory usage for data caching.

Question 23

In database performance tuning, which of the following techniques should be avoided?

Accepted Answer

Disabling indexes

Answer

Adding indexes

Answer

Upgrading hardware

Answer

Optimizing queries

Question 24

Which index type is ideal for optimizing range queries, allowing for efficient retrieval of data within a specified range?

Accepted Answer

B-Tree index

Answer

Full-text index

Answer

Bitmap index

Answer

Hash index

Question 25

What is the primary goal of database query optimization?

Accepted Answer

Minimize the number of input/output (I/O) operations required to execute a query, thereby improving efficiency

Answer

Enhance data security by encrypting sensitive information

Answer

Improve the readability and understandability of queries

Answer

Increase data redundancy to enhance data availability

Question 26

Which of the following is a widely used technique for query optimization?

Accepted Answer

Adding constraints to limit the data retrieved by a query, reducing the processing time and improving performance

Answer

Duplicating data across multiple tables, leading to data inconsistency and increased storage requirements

Answer

Disabling referential integrity, compromising data integrity and potentially leading to data loss

Question 27

Which storage option provides the highest performance for database workloads, enabling faster data access and retrieval?

Accepted Answer

Solid State Drive (SSD)

Answer

Hard Disk Drive (HDD)

Answer

Network Attached Storage (NAS)

Answer

Cloud storage

Question 28

What is the primary purpose of a database performance monitoring tool?

Accepted Answer

Identify performance issues and bottlenecks within the database system, allowing for targeted optimization

Answer

Manage user access and permissions to control data security and integrity

Answer

Back up and restore database contents to ensure data preservation and recovery

Question 29

Which metric is used to measure the time it takes for a database query to be processed and return results?

Accepted Answer

Latency

Answer

Concurrency

Answer

Throughput

Answer

Availability

Question 30

Explain the distinction between logical and physical database tuning.

Accepted Answer

Logical tuning focuses on optimizing query execution plans to improve query performance, while physical tuning involves adjusting hardware and storage configurations to enhance overall system performance.

Answer

Logical tuning requires specialized tools, while physical tuning can be done manually.

Question 31

What is a key benefit of database normalization?

Accepted Answer

Reduces data duplication and inconsistencies, improving data integrity and ensuring data accuracy

Answer

Increases query processing time due to the need for additional joins

Answer

Requires complex database structures that can be difficult to manage

Question 32

When designing a database, which indexing approach physically sorts table data in the order specified by the index key?

Accepted Answer

Clustered index

Answer

Non-clustered index

Answer

Hash index

Answer

Full-text index

Question 33

Which database performance optimization technique involves modifying a query to improve efficiency?

Accepted Answer

Query rewriting

Answer

Index creation

Answer

Data partitioning

Answer

Hardware upgrading

Question 34

Which of the following is a suggested practice when implementing performance tuning changes to a database system?

Accepted Answer

Testing changes in a controlled environment before applying them to production

Answer

Modifying the production database directly

Answer

Ignoring performance monitoring results

Answer

Implementing all changes at once

Question 35

What is the purpose of a database buffer pool?

Accepted Answer

Caching frequently used data for faster retrieval

Answer

Storing temporary data during query execution

Answer

Protecting database files from corruption

Answer

Enhancing data security

Question 36

What is the objective of a database performance tuning plan?

Accepted Answer

Identifying and resolving performance bottlenecks

Answer

Creating new database indexes

Answer

Monitoring database activity

Answer

Installing database software updates

Question 37

Which of the following is considered a disadvantage of indexing a database?

Accepted Answer

Increased storage space requirements

Answer

Reduced table size

Answer

Faster query execution

Answer

Improved data integrity

Question 38

Which of the following is NOT a factor that can affect database performance?

Accepted Answer

Number of database administrators

Answer

Hardware resources

Answer

Database design

Answer

Query complexity

Question 39

What is the purpose of an index in a database?

Accepted Answer

To speed up data retrieval

Answer

To store duplicate data

Answer

To delete unnecessary data

Answer

To ensure data integrity

Question 40

Which of the following query optimization techniques involves breaking down complex queries into smaller, more efficient ones?

Accepted Answer

Query decomposition

Answer

Query filtering

Answer

Query indexing

Answer

Query caching

Question 41

Which indexing technique is most efficient for searching for a specific value within a large table?

Accepted Answer

B-tree index

Answer

Full table scan

Answer

Hash index

Question 42

What is the primary purpose of a query optimizer?

Accepted Answer

To determine the most efficient execution plan for a query

Answer

To ensure data integrity

Answer

To create indexes for tables

Question 43

Which of the following SQL clauses can significantly improve query performance by limiting the amount of data processed?

Accepted Answer

WHERE

Answer

FROM

Answer

SELECT

Answer

ORDER BY

Question 44

Which hardware component has the most direct impact on database performance?

Accepted Answer

RAM

Answer

CPU

Answer

Hard drive

Answer

Network interface card

Question 45

What is the most appropriate strategy for tuning a database experiencing frequent table scans?

Accepted Answer

Create appropriate indexes for frequently queried columns

Answer

Increase RAM allocation for the database

Answer

Upgrade to a faster CPU

Question 46

Which of the following is NOT a common database performance monitoring tool?

Accepted Answer

MS Paint

Answer

SQL Server Management Studio

Answer

MySQL Workbench

Answer

Oracle Enterprise Manager

Question 47

How does database normalization typically impact performance?

Accepted Answer

It can improve performance by reducing data redundancy

Answer

It usually degrades performance due to increased joins

Answer

It has no significant impact on performance

Question 48

What is the primary purpose of database caching?

Accepted Answer

To store frequently accessed data in memory for faster retrieval

Answer

To compress data to reduce storage space

Answer

To encrypt sensitive data

Question 49

You notice a significant drop in database performance after a recent software upgrade. Which of the following is the most likely cause?

Accepted Answer

The upgrade may have introduced new performance bottlenecks or inefficiencies

Answer

The upgrade probably improved the database's security features

Answer

The upgrade likely increased the amount of data stored in the database

Question 50

Which of the following is NOT a type of index?

Accepted Answer

Clustered index

Answer

Bitmap index

Answer

Full-text index

Answer

Hash index

Question 51

What is the purpose of query optimization?

Accepted Answer

To improve the efficiency of query execution

Answer

To enhance data security

Answer

To reduce the cost of query execution

Answer

To ensure data integrity

Question 52

Which hardware component is most critical for database performance?

Accepted Answer

CPU

Answer

Hard disk

Answer

Network card

Answer

RAM

Question 53

What is the benefit of using a clustered index?

Accepted Answer

It improves data retrieval speed and reduces disk I/O

Answer

It simplifies data deletion

Answer

It reduces the size of the database

Question 54

What is the difference between a hash index and a B-tree index?

Accepted Answer

Hash index uses hashing to locate data, while B-tree index uses a hierarchical structure

Answer

B-tree index is more efficient for range queries

Answer

Hash index is faster than B-tree index

Question 55

Which of the following query optimization techniques does NOT involve modifying the query itself?

Accepted Answer

Denormalization

Answer

Query rewriting

Answer

Index creation

Question 56

What is the role of a query optimizer in database performance tuning?

Accepted Answer

It analyzes queries and generates an optimized execution plan

Answer

It indexes data based on query patterns

Answer

It monitors database performance and detects bottlenecks

Question 57

Which of the following is a benefit of hardware upgrades for database performance?

Accepted Answer

Increased CPU speed and memory capacity

Answer

Reduced data redundancy

Answer

Simplified data maintenance

Answer

Improved data security

Question 58

What is the primary goal of database performance tuning?

Accepted Answer

To optimize database performance and minimize resource consumption

Answer

To simplify database administration

Answer

To ensure data accuracy and reliability