DAD 220 Introduction to SQL 2026/2027 | 10 Exam Questions & Answers | MySQL, DBMS, ACID Transactions & Database Architecture | SNHU

DAD 220 Introduction to SQL 2026/2027 is a concise 3-page exam preparation document containing 10 questions with verified answers covering foundational relational database and SQL concepts. The material focuses on open-source data, ACID transaction properties, database-system components, Structured Query Language (SQL), MySQL, database management systems (DBMS), database performance, two-tier architecture and MySQL account configuration. The direct question-and-answer format makes the resource especially suitable for rapid review, self-testing and preparation for early DAD 220 assessments. A central topic is relational database transaction management. The document identifies the four ACID properties—Atomicity, Consistency, Isolation and Durability—required for reliable transactions that modify relational data. It also tests students on important database-system components, including the query processor, storage manager and transaction manager, establishing the architectural foundation needed to understand how a DBMS receives queries, manages stored information and processes transactions. These concepts are consistent with the established treatment of transaction processing and database-system architecture in Silberschatz, Korth and Sudarshan's Database System Concepts. The resource also covers SQL and MySQL fundamentals. Students review SQL as a widely used language for communicating with database systems and the role of the MySQL command-line client in connecting to a MySQL server, performing administrative functions and executing SQL statements. The document further identifies the root account as the account for which a password must be entered during the referenced MySQL installation process. These subjects correspond with core MySQL concepts documented in the MySQL Reference Manual, including client-server operation, user accounts and SQL statement execution. Another section addresses DBMS architecture and performance. A database management system is defined as software supporting the organization of data in a database, while workload, throughput and available resources are identified as factors that can affect database performance. The document also tests understanding of two-tier architecture, identifying the client and server as its principal components. The material additionally introduces students to public and open-source data, referencing D, NYC Open Data and the National Cancer Institute as examples of sources through which public datasets may be accessed. This provides useful context for students learning how databases and data-management skills can be applied to real-world datasets in science, technology, engineering, mathematics and public-sector analysis. Relevant Students: This document is particularly relevant to Southern New Hampshire University (SNHU) students taking DAD 220 Introduction to SQL, as well as students studying introductory databases, SQL, data analytics, information technology, computer science, information systems and related programs. It is especially useful for learners reviewing the introductory DAD 220 material on relational databases, MySQL, transaction properties and database architecture. Keywords: DAD 220, DAD 220 Introduction to SQL, DAD 220 SNHU, DAD , DAD 220 exam questions and answers, SNHU DAD 220, Introduction to SQL exam, SQL questions and answers, MySQL questions and answers, relational database, database management system, DBMS, ACID properties, atomicity consistency isolation durability, database transactions, query processor, storage manager, transaction manager, MySQL command line client, MySQL root account, database architecture, two tier architecture, client server database, database performance, workload, throughput, SQL study guide, MySQL study guide, database exam preparation