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Questions and Answers
What is the primary function of transaction management in a database?
What is an instance in the context of a database?
What type of independence allows modifying the physical schema without changing the logical schema?
What component is responsible for handling business logic and communicating with the database server in a three-tier architecture?
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What type of database system is designed to improve performance by using multiple processors and storage devices in a shared memory or shared disk configuration?
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What is the function of a DDL compiler in a database system?
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Which component is responsible for query optimization in a database system?
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What is the primary function of the storage manager in a database system?
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What is the primary function of a Database Administrator (DBA)?
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In which era did SQL emerge as an industrial standard?
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What is the main characteristic of NoSQL systems?
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What is the term for a collection of operations that performs a single logical function?
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What is responsible for translating DML statements into low-level instructions?
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What type of database application involves managing production, inventory, orders, and supply chain?
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What is a disadvantage of storing data in multiple file formats?
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What is responsible for executing a query and producing the desired result?
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Study Notes
Database Management Systems
- Transaction management ensures that the database remains in a consistent state despite failures.
- An instance is the snapshot of the data stored in the database at a specific moment in time.
Data Independence
- Physical data independence allows modifying the physical schema without changing the logical schema.
Database Architecture
- In a three-tier architecture, the application server communicates directly with the database system.
- Parallel databases are designed to improve performance by using multiple processors and storage devices in a shared memory or shared disk configuration.
Database Components
- The query processor is responsible for query optimization.
- The storage manager handles the storage, retrieval, and updating of data.
Database Administration
- The main function of a database administrator (DBA) is managing the database schema and storage structure.
Database Types
- NoSQL systems are designed for big data storage.
Database Applications
- Examples of database applications include enterprise information, manufacturing, banking and finance, and universities.
- Manufacturing involves managing production, inventory, orders, and supply chain.
Transactions
- A transaction is a collection of operations that performs a single logical function in a database application.
Database Issues
- Data redundancy and inconsistency occur when data is stored in multiple file formats.
- Data redundancy and inconsistency can lead to duplication and inconsistency across different files.
Data Definition Language (DDL)
- The main purpose of DDL is to define the database schema.
Relational Model
- In a relational model, data is stored in various tables.
- A primary key in a database is a field that uniquely identifies a row in a table.
Data Manipulation Language (DML)
- Declarative DML requires specifying what data are needed without specifying how to get those data.
- A DML compiler translates DML statements into low-level instructions.
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Description
Quiz about database management systems, covering topics such as transaction management and database instances.
