Database Performance Tuning: Enhance Database Efficiency

Question 1

Which of the following is not an advantage of creating indexes in a database?

Accepted Answer

Reduced storage space requirements

Answer

Improved performance for SELECT queries

Answer

Faster data retrieval

Answer

Enforced data uniqueness

Question 2

What is the main purpose of using the EXPLAIN keyword?

Accepted Answer

Display the execution plan of a query

Answer

Optimize the database schema

Answer

Create new indexes

Answer

Troubleshoot database performance issues

Question 3

What is the primary goal of database monitoring?

Accepted Answer

To identify and resolve performance problems

Answer

To track user activities

Answer

To ensure data integrity

Answer

To create backups

Question 4

What is the key difference between a clustered index and a non-clustered index?

Accepted Answer

Clustered index physically sorts data by the index key, while non-clustered index does not

Answer

Non-clustered index physically sorts data by the index key, while clustered index does not

Answer

Clustered index can only be created on a primary key, while non-clustered index can be created on any column

Answer

Non-clustered index can only be created on a primary key, while clustered index can be created on any column

Question 5

What is the primary function of a database log?

Accepted Answer

To record all changes made to the database

Answer

To store backup copies of data

Answer

To manage user access permissions

Answer

To optimize query performance

Question 6

Which of the following is not considered a best practice for database performance tuning?

Accepted Answer

Creating additional indexes to enhance performance

Answer

Regularly analyzing and rebuilding indexes

Answer

Utilizing temporary tables for large datasets

Answer

Avoiding unnecessary joins

Question 7

What is the primary function of a database optimizer?

Accepted Answer

Automatically tuning database performance

Answer

Creating and managing indexes

Answer

Troubleshooting database performance issues

Answer

Backing up and restoring databases

Question 8

Which of the following index types is commonly used to enhance query performance by organizing data in a hierarchical structure?

Accepted Answer

B-tree index

Answer

Hash index

Answer

Bitmap index

Answer

Spatial index

Question 9

What is the primary objective of query optimization?

Accepted Answer

To reduce the number of disk I/Os required to execute a query, optimizing its performance

Answer

To minimize the amount of memory used by a query, improving its efficiency

Answer

To improve the readability and maintainability of a query, making it easier to understand and modify

Answer

To reduce the latency of a query, shortening the time it takes to return results

Question 10

Which of the following query optimization techniques involves decomposing a complex query into smaller, simpler queries to enhance performance?

Accepted Answer

Query rewriting

Answer

Predicate pushing

Answer

Index merging

Answer

Materialized views

Question 11

When troubleshooting database performance issues, what is a key consideration?

Accepted Answer

Identifying the underlying root cause of the problem, ensuring effective resolution

Answer

Applying quick fixes without understanding the underlying causes, potentially leading to recurring issues

Answer

Ignoring error messages and warnings, which may provide valuable insights into the problem

Answer

Blaming the users for performance issues, which is unlikely to resolve the underlying technical causes

Question 12

What is the primary purpose of creating a materialized view?

Accepted Answer

To enhance the performance of frequently used and complex queries, improving data access speed

Answer

To reduce data redundancy and improve data consistency, ensuring data integrity

Answer

To provide a snapshot of data at a specific point in time, facilitating historical analysis

Answer

To enhance data security and prevent unauthorized access, protecting sensitive information

Question 13

Which of the following is a common factor that can contribute to slow database performance?

Accepted Answer

All of the above, highlighting the multifaceted nature of performance issues

Answer

Improper indexing, leading to inefficient data retrieval

Answer

Inefficient queries, consuming excessive resources

Answer

Hardware limitations, such as insufficient memory or slow storage

Question 14

What is the primary role of a primary key in a relational database?

Accepted Answer

To uniquely identify each row in a table, ensuring data integrity and uniqueness

Answer

To enforce referential integrity between tables, maintaining data consistency

Answer

To speed up data retrieval operations, optimizing performance

Answer

To prevent duplicate data from being inserted into a table, preserving data quality

Question 15

For queries that retrieve a range of values from a table, which index type is most suitable for optimizing performance?

Accepted Answer

B-tree index

Answer

Hash index

Answer

Bitmap index

Question 16

What is the primary goal of database monitoring and troubleshooting?

Accepted Answer

Identify and resolve performance bottlenecks

Answer

Maintain data security

Answer

Prevent data loss

Answer

Optimize storage utilization

Question 17

What is the purpose of a clustered index?

Accepted Answer

To physically order the data on the disk based on a specified key

Answer

To accelerate data retrieval based on any column

Answer

To prevent duplicate values from being inserted

Answer

To enforce referential integrity constraints

Question 18

What is the difference between a primary key and a unique index?

Accepted Answer

A primary key cannot be null, while a unique index can

Answer

A primary key is automatically created, while a unique index must be explicitly defined

Answer

A primary key can have duplicate values, while a unique index cannot

Answer

There is no functional difference between a primary key and a unique index

Question 19

In database performance tuning, which technique focuses on identifying and optimizing queries that consume the most time?

Accepted Answer

Query optimization

Answer

Index optimization

Answer

Database troubleshooting

Answer

Database performance tuning best practices

Question 20

Which of the following is a disadvantage of using indexes in a database?

Accepted Answer

Larger database size

Answer

Faster data retrieval

Answer

Reduced data duplication

Answer

Enhanced data integrity

Question 21

Which database monitoring tool is designed to capture information about database performance and activity?

Accepted Answer

Performance monitor

Answer

Query analyzer

Answer

Optimizer trace

Answer

Data profiler

Question 22

What is the central purpose of database normalization?

Accepted Answer

To reduce data redundancy and improve data integrity

Answer

To enhance database performance

Answer

To simplify database design

Question 23

How does a database buffer pool contribute to performance tuning?

Accepted Answer

By caching frequently accessed data and reducing disk I/O

Answer

By storing temporary data during query execution

Answer

By managing transactions and ensuring data consistency

Question 24

What is the primary objective of database scaling?

Accepted Answer

To increase the capacity and performance of a database system

Answer

To reduce the cost of database maintenance

Answer

To enhance database security

Question 25

What is the primary goal of a clustered index?

Accepted Answer

Stores data in a particular physical order

Answer

Accelerates data retrieval using multiple columns

Answer

Minimizes database size

Answer

Supports faster updates and insertions

Question 26

Which technique is commonly used for query optimization?

Accepted Answer

Utilizes indexes to avoid exhaustive table scans

Answer

Expands RAM capacity on the database server

Answer

Increases the number of database connections

Question 27

What is the primary function of a database monitoring tool?

Accepted Answer

Collects and examines performance statistics

Answer

Manages database backups

Answer

Troubleshoots database errors

Answer

Optimizes database queries

Question 28

Which approach is a standard database troubleshooting technique?

Accepted Answer

Reviewing database logs for error messages

Answer

Reinstalling database software

Answer

Deleting and recreating the database

Answer

Employing trial-and-error methods

Question 29

What is the intended purpose of a database performance tuning plan?

Accepted Answer

Recognizes and addresses performance bottlenecks

Answer

Documents the database architecture

Answer

Educates database administrators

Answer

Establishes automated database backups

Question 30

Which metric is crucial for evaluating database performance?

Accepted Answer

Query execution time

Answer

Number of active database connections

Answer

Database size

Answer

Available disk space

Question 31

What differentiates a clustered index from a non-clustered index?

Accepted Answer

A clustered index organizes data physically, while a non-clustered index does not

Answer

A clustered index is always unique, while a non-clustered index permits duplicates

Answer

A clustered index is restricted to a single column, while a non-clustered index works with multiple columns

Question 32

What advantage does a database monitoring tool provide?

Accepted Answer

Facilitates the detection of performance bottlenecks

Answer

Reduces database size

Answer

Automatically corrects database errors

Answer

Accelerates database queries

Question 33

What is the purpose of a database performance tuning test?

Accepted Answer

Measures database performance under varying conditions

Answer

Generates a database performance tuning plan

Answer

Troubleshoots database issues

Question 34

Which of the following is a benefit of indexing a database?

Accepted Answer

Improved query performance

Answer

Reduced storage space

Answer

Increased data redundancy

Question 35

The purpose of query optimization is to:

Accepted Answer

Rewrite queries to improve their efficiency

Answer

Identify slow-running queries

Answer

Create new queries that are more efficient

Question 36

Which of the following tools can be utilized to monitor database performance?

Accepted Answer

Performance dashboards

Answer

Calculators

Answer

Spreadsheets

Answer

Notepads

Question 37

The most frequent cause of slow database performance is usually:

Accepted Answer

Inefficient queries

Answer

User errors

Answer

Hardware limitations

Answer

Database corruption

Question 38

When creating indexes, it is recommended to:

Accepted Answer

Create indexes on frequently used columns

Answer

Create indexes on columns with unique values

Answer

Create indexes on all columns

Answer

Create indexes on rarely used columns

Question 39

The main purpose of database normalization is to:

Accepted Answer

Reduce data redundancy and improve data integrity

Answer

Make queries more efficient

Answer

Increase database size

Question 40

The database optimizer is responsible for:

Accepted Answer

Creating and optimizing execution plans for queries

Answer

Managing user permissions

Answer

Validating database syntax

Question 41

A widely used metric for measuring database performance is:

Accepted Answer

Query execution time

Answer

Amount of free disk space

Answer

Database size

Answer

Number of database users

Question 42

The database schema is used to:

Accepted Answer

Define the structure and relationships of data in a database

Answer

Manage user access to data

Answer

Store data in a specific format

Question 43

In the context of database performance tuning, what is the primary objective of query optimization?

Accepted Answer

To enhance the efficiency of Structured Query Language (SQL) queries

Answer

To minimize database storage space

Answer

To strengthen data security measures

Answer

To safeguard against data loss

Question 44

Among the following options, which tool is commonly used to monitor database performance?

Accepted Answer

A database management system (DBMS) performance dashboard

Answer

File management utilities

Answer

Anti-virus software

Question 45

What is the primary benefit of normalizing a database?

Accepted Answer

Reducing data redundancy while enhancing data integrity

Answer

Increasing database storage requirements

Answer

Boosting data security

Question 46

Compared to a flat file system, what advantage does a database management system (DBMS) offer?

Accepted Answer

Enhanced data integrity

Answer

Reduced storage costs

Answer

Increased data redundancy

Answer

Accelerated data access

Question 47

In a relational database, what is the primary purpose of a foreign key?

Accepted Answer

Enforcing referential integrity among tables

Answer

Enhancing query performance

Answer

Generating a unique identifier for each row

Answer

Storing additional information about a row

Question 48

When tuning database performance, which of the following is considered a best practice?

Accepted Answer

Creating indexes on frequently accessed columns

Answer

Executing queries repeatedly within a loop to improve performance

Answer

Avoiding the use of joins in queries

Answer

Distributing data across multiple tables to minimize storage space

Question 49

**Which of the following is the primary objective of database performance tuning?**

Accepted Answer

Improving the efficiency of database operations to meet performance requirements.

Answer

Reducing the amount of storage space required by the database.

Answer

Minimizing data loss and ensuring data integrity.

Question 50

**Which query optimization technique employs statistical information to estimate the cost of different execution plans?**

Accepted Answer

Cost-based optimization

Answer

Rule-based optimization

Answer

Heuristic optimization

Question 51

**What is the main purpose of database monitoring tools in performance tuning?**

Accepted Answer

Collecting and analyzing performance metrics to identify potential bottlenecks.

Answer

Performing regular database backups.

Answer

Managing user access and permissions.

Answer

Identifying and resolving security vulnerabilities.

Question 52

**When optimizing database performance, what should be the key priority?**

Accepted Answer

Identifying and addressing the root causes of performance problems.

Answer

Applying optimizations to every aspect of the database system.

Answer

Focusing solely on improving response times.

Answer

Implementing all possible optimization techniques regardless of their impact.

Question 53

**Which of the following is a primary advantage of using clustered indexes?**

Accepted Answer

Improved efficiency in retrieving data by physically organizing it in sequential order based on the index key.

Answer

Reduced storage space requirements.

Answer

Enhanced data security.

Answer

Increased concurrency for write operations.

Question 54

**What is the function of a histogram in query optimization?**

Accepted Answer

Dividing the data values into ranges (buckets) to provide statistical information for better query planning.

Answer

Identifying and removing duplicate data.

Answer

Caching frequently accessed data in memory.

Question 55

**Which of the following is a potential disadvantage of using materialized views?**

Accepted Answer

Increased storage overhead due to the duplication of data.

Answer

Improved query execution speed.

Answer

Reduced concurrency for data updates.

Answer

Enhanced data security.

Question 56

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

Accepted Answer

Generating efficient execution plans for queries by evaluating alternative plans and choosing the one with the lowest estimated cost.

Answer

Identifying design flaws in the database schema.

Answer

Optimizing the physical storage structures of data.

Answer

Monitoring database performance metrics and alerting administrators.