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Question 1

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Which type of database management system organizes data into tables with rows and columns, enforces a predefined schema, and uses SQL as its primary query language?

Document database (NoSQL)

Relational database (RDBMS)

Key-value store

Graph database

to track

2026 Statistics

Key Facts: DataSys+ Exam

Max Questions

CompTIA

700/900

Passing Score

CompTIA (scaled)

90 min

Exam Duration

CompTIA

$370

Exam Fee

CompTIA

24%

Mgmt & Maintenance

Largest domain

3 years

Validity

Renewable via CEUs

The CompTIA DataSys+ exam has up to 90 questions in 90 minutes with a passing score of 700/900. Domains: Database Fundamentals (23%), Database Deployment (21%), Database Management and Maintenance (24%), Data and Database Security (16%), and Business Continuity (16%). Exam fee is $370 USD. Certification is valid for 3 years and renewable via CEUs. Available in-person at Pearson VUE or online proctored.

Sample DataSys+ Practice Questions

Try these sample questions to test your DataSys+ exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1Which type of database management system organizes data into tables with rows and columns, enforces a predefined schema, and uses SQL as its primary query language?

A.Document database (NoSQL)

B.Relational database (RDBMS)

C.Key-value store

D.Graph database

Explanation: A relational database management system (RDBMS) such as PostgreSQL, MySQL, Oracle, or SQL Server stores data in tables with rows (tuples) and columns (attributes), enforces a predefined schema, and uses SQL for data manipulation. Document databases like MongoDB store JSON-like documents; key-value stores like Redis pair keys with values; graph databases like Neo4j represent data as nodes and edges.

2Which NoSQL database type is best suited for storing user session data that requires sub-millisecond reads with simple lookups by a unique identifier?

A.Neo4j graph database

B.Cassandra wide-column store

C.Redis key-value store

D.Elasticsearch search engine

Explanation: Redis is an in-memory key-value store optimized for extremely fast lookups by a single key, making it ideal for session caching. Neo4j is optimized for relationship-heavy queries; Cassandra targets high-write time-series and wide-column workloads; Elasticsearch is for full-text search and log analytics.

3Which SQL statement retrieves data from one or more tables?

A.INSERT

B.UPDATE

C.SELECT

D.DELETE

Explanation: SELECT retrieves rows from one or more tables and is the primary Data Manipulation Language (DML) statement for querying. INSERT adds new rows, UPDATE modifies existing rows, and DELETE removes rows.

4Which JOIN type returns only the rows that have matching values in both tables?

A.LEFT JOIN

B.RIGHT JOIN

C.INNER JOIN

D.FULL OUTER JOIN

Explanation: INNER JOIN returns only rows where the join condition is satisfied in both tables. LEFT JOIN returns all rows from the left table plus matches; RIGHT JOIN does the opposite. FULL OUTER JOIN returns all rows from both tables, with NULLs where there is no match.

5A table contains repeating groups of phone numbers stored as a comma-separated list in a single column. To achieve First Normal Form (1NF), which change is required?

A.Split the phone numbers into a separate table with one row per number

B.Add a primary key constraint on the existing column

C.Create a foreign key pointing to itself

D.Add a CHECK constraint that validates the format

Explanation: 1NF requires atomic values — each column must hold a single, indivisible value and no repeating groups. Moving the phone numbers to a related table with one row per number eliminates the repeating group. A primary key, self-referencing FK, or CHECK constraint does not resolve a 1NF violation.

6Which property of ACID guarantees that once a transaction commits, its changes survive a subsequent system crash?

A.Atomicity

B.Consistency

C.Isolation

D.Durability

Explanation: Durability ensures committed changes are persisted to non-volatile storage (typically via the transaction log / WAL) and survive failures. Atomicity means all-or-nothing execution, Consistency means the database moves between valid states, and Isolation governs how concurrent transactions interact.

7A developer wants to retrieve the top 3 highest-salaried employees per department. Which SQL feature is most appropriate?

A.A simple ORDER BY with LIMIT

B.A window function with ROW_NUMBER() OVER (PARTITION BY department ORDER BY salary DESC)

C.A SELF JOIN with WHERE clause

D.A CROSS JOIN followed by GROUP BY

Explanation: Window functions like ROW_NUMBER() with PARTITION BY compute a ranking per group without collapsing rows. ORDER BY LIMIT only works on the full result set. A self join can approximate this but is harder to read and usually slower. CROSS JOIN produces a Cartesian product and is not appropriate.

8Which constraint ensures that a column cannot contain duplicate values across rows but, unlike PRIMARY KEY, does allow one NULL (in most RDBMSs)?

A.CHECK

B.UNIQUE

C.FOREIGN KEY

D.NOT NULL

Explanation: A UNIQUE constraint prohibits duplicate values in a column but typically allows a single NULL (behavior varies by engine). PRIMARY KEY additionally disallows NULLs. CHECK enforces a Boolean expression, FOREIGN KEY references another table, and NOT NULL only prevents NULLs without enforcing uniqueness.

9Which database model is OPTIMAL for representing and querying highly interconnected social-network data where friendship paths of up to six degrees must be traversed efficiently?

A.Relational database with many-to-many junction tables

B.Graph database such as Neo4j

C.Columnstore data warehouse

D.Time-series database

Explanation: Graph databases like Neo4j store nodes and edges natively and traverse relationships in constant time per hop, making them ideal for multi-hop social network queries. Relational many-to-many joins become exponentially expensive at deep traversal. Columnstore warehouses are for analytics, and time-series databases are for metric-style data.

10In an OLTP workload of thousands of small, concurrent credit-card transactions, which characteristic is MOST important?

A.High-throughput bulk aggregation over months of data

B.Low-latency, high-concurrency reads and writes with strict ACID guarantees

C.Full-text relevance scoring across documents

D.Eventual consistency across global regions

Explanation: OLTP (Online Transaction Processing) systems like banking platforms require low-latency, high-concurrency ACID transactions to maintain correct balances. Bulk aggregation is an OLAP concern; relevance scoring is a search engine concern; eventual consistency is typical of globally distributed NoSQL rather than financial OLTP.

About the DataSys+ Exam

The CompTIA DataSys+ (DS0-001) certification validates foundational database administration skills across relational and NoSQL platforms. It covers database fundamentals (SQL, normalization, ACID), database deployment and migration, management and maintenance, data and database security, and business continuity — providing a vendor-neutral credential for aspiring database administrators.

Questions

90 scored questions

Time Limit

90 minutes

Passing Score

700/900 (scaled)

Exam Fee

$370 (CompTIA / Pearson VUE)

DataSys+ Exam Content Outline

23%

Database Fundamentals

DBMS types (relational, document, key-value, graph, wide-column), SQL DML/DDL, JOINs, normalization (1NF, 2NF, 3NF, BCNF), ACID vs BASE, data types, OLTP vs OLAP

21%

Database Deployment

Installation, configuration, schemas, environments (dev/staging/prod), IaC (Terraform/CloudFormation), cloud databases (RDS, Azure SQL, Cosmos DB), migration strategies, ETL vs ELT

24%

Database Management and Maintenance

Indexes (B-tree, hash, bitmap, columnstore), query plans, stored procedures, triggers, views, transactions, isolation levels, locks, deadlocks, performance monitoring, partitioning

16%

Data and Database Security

Authentication, authorization, least privilege, RLS, TDE, TLS, data masking, auditing, SQL injection prevention, compliance (GDPR, HIPAA, PCI DSS), data sovereignty

16%

Business Continuity

Backup types (full, differential, log, incremental), RPO/RTO, replication (sync/async), HA (clustering, Always On AGs, streaming replication), DR strategies, sharding, PITR

How to Pass the DataSys+ Exam

What You Need to Know

Passing score: 700/900 (scaled)
Exam length: 90 questions
Time limit: 90 minutes
Exam fee: $370

Keys to Passing

Complete 500+ practice questions
Score 80%+ consistently before scheduling
Focus on highest-weighted sections
Use our AI tutor for tough concepts

DataSys+ Study Tips from Top Performers

1Focus on Management and Maintenance (24%) and Database Fundamentals (23%) - together they are ~47% of the exam

2Memorize the ACID properties and the four isolation levels - READ UNCOMMITTED, READ COMMITTED, REPEATABLE READ, SERIALIZABLE

3Know normalization forms - 1NF (atomic values), 2NF (no partial dependency), 3NF (no transitive dependency), BCNF (every determinant is a superkey)

4Master backup types - full, differential, transaction log, copy-only, and how they chain together for PITR

5Understand HA options - SQL Server Always On AGs, PostgreSQL streaming replication, MySQL replication

6Practice SQL JOINs (INNER/LEFT/RIGHT/FULL/CROSS), window functions, and CTEs - expect scenario-based questions

7Know SQL injection defenses - parameterized queries / prepared statements are the gold standard

Frequently Asked Questions

What is the CompTIA DataSys+ exam?

The CompTIA DataSys+ (DS0-001) exam validates foundational database administration skills. It is a vendor-neutral certification covering relational and NoSQL databases, SQL, normalization, security, backup/recovery, replication, and high availability, preparing candidates for entry-level database administrator roles.

How many questions are on the DataSys+ exam?

The CompTIA DataSys+ exam has up to 90 multiple-choice and performance-based questions in 90 minutes. The passing score is 700 out of 900 (scaled). Exam fee is $370 USD.

Are there prerequisites for the DataSys+ exam?

No formal prerequisites are required. CompTIA recommends 2-3 years of database administration experience or equivalent knowledge, along with Network+ or Data+ level understanding, but these are suggestions rather than hard requirements.

What is the largest domain on the DataSys+ exam?

Database Management and Maintenance is the largest domain at 24%. It covers indexes, query plans, stored procedures, triggers, views, transactions, isolation levels, concurrency (locks and deadlocks), performance monitoring, and partitioning.

How should I prepare for the DataSys+ exam?

Plan for 80-120 hours of study over 8-12 weeks. Combine CompTIA's official CertMaster Learn, hands-on work in PostgreSQL/MySQL/SQL Server, practice with SQL queries, and 100+ practice questions. Focus on Management and Maintenance (24%) and Database Fundamentals (23%), which together total nearly half the exam.

What jobs can I get with DataSys+ certification?

DataSys+ targets entry-level roles including Database Administrator, Database Analyst, Data Operations Specialist, Junior Database Developer, and Data Support roles. It also serves as a stepping stone to vendor-specific certs like Oracle, Microsoft Azure Database, or AWS Database Specialty.