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Exam Information
Official specifications published by CompTIA
Exam Format
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Skills this practice test covers
- Compare relational, document, key-value and graph databases for a given workload.
- Write SQL with DDL, DML and TCL, and build views, stored procedures and triggers.
- Design a deployment for on-premises, cloud or hybrid hosting, then test it under load.
- Speed up slow queries with execution plans and better indexes.
- Protect data with encryption, data masking, role-based access control and SQL injection defenses.
- Plan backups, restores and high availability that meet a stated RTO and RPO.
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DS0-001 exam content
5 domains · 31 topics · 252 of 255 questions sorted by domain
Database Fundamentals24%66 questions
This domain is the base for the rest of the exam. Candidates compare relational and NoSQL designs, write and run SQL, choose between scripting methods, and explain how programming choices such as ORM tools affect a database.
Skills tested
- Choose a relational database or a document, key-value, column-oriented or graph store for a use case.
- Write CREATE, ALTER, SELECT, INSERT, UPDATE and DELETE statements, and end transactions with COMMIT or ROLLBACK.
- Explain atomicity, consistency, isolation and durability with a transaction example.
- Compare server-side and client-side scripts in PowerShell, Python and Bash.
- Describe how ORM tools such as Hibernate and Entity Framework create SQL and affect performance.
Official topics
- Database Structure Types
- SQL Code Development
- Scripting Methods
- Programming Impact on Databases
Database Deployment16%41 questions
This domain runs from requirements to a working database. Candidates plan and design the architecture, document it with ERDs and data dictionaries, and test it before users depend on it.
Skills tested
- Turn business and technical requirements into a capacity and scalability plan.
- Pick a cloud hosting model, such as IaaS, PaaS or SaaS, or an on-premises or hybrid design.
- Validate the schema, test connectivity and run stress tests before release.
- Install, configure and provision the database, including its service accounts.
Official topics
- Planning and Design
- Implementation and Testing
- Deployment Phases
Database Management and Maintenance25%56 questions
The largest domain covers the daily care of a running database. Candidates watch alerts, metrics and transaction logs, tune queries and indexes, apply patches, keep documentation current, and run data tasks such as archiving.
Skills tested
- Track performance metrics, resource use and connections to find a bottleneck.
- Read an execution plan and add, rebuild or drop indexes to speed up queries.
- Run integrity checks, apply patches and plan capacity.
- Keep data dictionaries, ERDs and standard operating procedures up to date.
- Use views and materialized views, manage redundancy, and archive old data.
Questions by topic
- Query Optimization and Indexing2
- Performance Tuning and Troubleshooting8
- Data Management Tasks10
- Concurrency Control2
- Performance Tuning5
- Index Optimization6
- Maintenance Processes11
- Data Migration Strategies1
- Documentation and Tools6
- Monitoring and Reporting3
- Migration and Connectivity Troubleshooting1
- Query Performance Analysis1
Data and Database Security23%55 questions
This domain protects data and the systems that hold it. Candidates apply encryption and masking, follow rules such as GDPR and PCI DSS, control access, secure the infrastructure, and defend against attacks such as SQL injection.
Skills tested
- Encrypt data in transit and at rest, and mask sensitive fields before others see them.
- Apply data classification, retention policies and data loss prevention to meet regulations.
- Grant access with role-based access control, service accounts and least privilege.
- Combine physical controls such as biometrics with logical ones such as firewalls and port security.
- Recognize SQL injection, brute-force and denial of service attacks, and pick the defense for each.
Questions by topic
- Access Control Mechanisms6
- Data Masking6
- Governance and Compliance6
- Infrastructure Security8
- Authentication and Authorization14
- Threat Mitigation3
- Data Security Concepts10
- Encryption Implementation1
- SQL Injection Prevention1
Business Continuity12%34 questions
The smallest domain is about surviving failures. Candidates plan backups and recovery, build high availability with clustering, replication and failover, and assess risk with an impact analysis.
Skills tested
- Compare full, differential and incremental backups, and set a retention policy.
- Restore a database to a point in time, and test restores on a schedule.
- Design high availability with clustering, replication, load balancing and failover.
- Set RTO and RPO targets from a business impact assessment.
Official topics
- Backup and Recovery
- High Availability
- Risk Assessment
Requirements
- No formal prerequisites: anyone can book the exam.
- Recommended: two to three years of hands-on database administration.
- Recommended: comfort writing SQL queries and small scripts, for example in Python or PowerShell.
About the DS0-001 exam
DS0-001 is the CompTIA exam for database administrators, and passing it earns the vendor-neutral CompTIA DataSys+ certification. It covers the whole life of a database: choosing a structure, writing SQL, deploying, monitoring, securing, and recovering after a failure. No formal prerequisite applies, though CompTIA recommends two to three years of hands-on database administration.
The PlanetCert practice test covers all five domains, with the most questions in Database Fundamentals and in Database Management and Maintenance. Explanations matter most where two choices sound close, such as differential and incremental backups, or encryption at rest and in transit. The SQL statement families and the four ACID properties are good material for Flashcard Mode. Brainy AI Assistant can walk through a slow query's execution plan, or compare RTO and RPO for a recovery plan.
How to earn the certification
- Earns
- CompTIA DataSys+Intermediate
CompTIA DataSys+ is valid for three years and renews through CompTIA's continuing education program.
- After
- 1z0-071 Oracle Database SQL
Oracle's SQL exam, a vendor-specific next step for administrators who run Oracle Database.
- DP-900 Azure Data Fundamentals
Microsoft's exam on core data concepts and Azure data services, for administrators who move databases to Azure.
- 1z0-071 Oracle Database SQL
How to prepare for DS0-001
- 1
Install two kinds of database
Set up one relational database and one NoSQL database on a laptop or a small cloud instance. Load the same small data set into both, and note what each model makes easy or hard.
- 2
Write SQL until it feels routine
Create tables with DDL, change rows with DML, and wrap the changes in transactions with COMMIT and ROLLBACK. Then add a view, a stored procedure and a trigger, and script one task in Python or PowerShell.
- 3
Tune a query with its execution plan
Database Management and Maintenance is the largest domain. Load enough rows to make a query slow, read its execution plan, add an index, and compare the plan again.
- 4
Rehearse a restore, not only a backup
Take a full backup, then incremental or differential backups, and restore to a point in time. Note how long the restore took and how much data was lost, then compare that with a target RTO and RPO.
- 5
Drill each domain, then time it
Work through the DS0-001 practice test one domain at a time in Study Mode, then take a full run in Timed Mode. Ask Brainy AI Assistant to explain each missed security or backup question with an example.
Start a timed DS0-001run
For DS0-001, CompTIA offers CertMaster Learn, CertMaster Labs and CertMaster Practice for DataSys+, and publishes an official DataSys+ study guide.
Who DS0-001 is for
- Database administrators who want a vendor-neutral certification for their daily work.
- IT support and network staff who are taking on database duties.
- Developers and data analysts who write SQL and now help run the database behind it.
- System engineers who host databases on servers or cloud platforms.
Typical job titles: Database administrator · Cloud database administrator · Database analyst · Data systems administrator · Systems engineer
DS0-001 glossary
18 terms from the exam objectives and the vendor's official material, each defined in a sentence.
- ACID principles
- Atomicity, consistency, isolation and durability: the four properties that keep database transactions reliable.
- Data definition language (DDL)
- SQL statements such as CREATE, ALTER and DROP that define or change database objects like tables.
- Data dictionaries
- Documents that describe each table and column in a database: its name, data type, meaning and rules.
- Data loss prevention (DLP)
- Tools and rules that detect sensitive data and stop it from leaving the organization, for example by email or upload.
- Data manipulation language (DML)
- SQL statements such as SELECT, INSERT, UPDATE and DELETE that read or change the rows in tables.
- Data masking
- Replacing real values, such as card numbers, with realistic fake ones, so people can work with the data without seeing the originals.
- Entity relationship diagrams (ERDs)
- Diagrams that show a database's tables, their columns and how the tables relate to each other.
- Incremental backups
- Backups that copy only the changes since the last backup of any kind. Each one is small, but a restore needs the whole chain.
- Materialized views
- Views that store the result of their query. Reads are fast, but the stored result must be refreshed when the data changes.
- NoSQL
- Non-relational databases, such as document, key-value, column-oriented and graph stores, which do not require a fixed schema of related tables.
- Object-relational mapping (ORM)
- A software layer, such as Hibernate or Entity Framework, that maps program objects to tables and writes the SQL for the developer.
- Point-in-time recovery
- Restoring a database to its state at a chosen moment, using a backup plus the transaction logs written after it.
- Recovery point objective (RPO)
- The largest amount of recent data, measured in time, that the business accepts losing after a failure.
- Recovery time objective (RTO)
- The longest time the business accepts a system being down before it must work again.
- Role-based access control
- Giving permissions to roles, such as analyst or administrator, and then giving each user only the roles the job needs.
- SQL injection
- An attack that hides SQL code in an input field, so the database runs commands the application never intended.
- Stored procedures
- Named blocks of SQL kept in the database, which applications call instead of sending their own statements.
- Transaction control language (TCL)
- SQL statements such as COMMIT and ROLLBACK that end a transaction by saving or undoing its changes.