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Questions and Answers
What is a defining characteristic of an intentional event in a database context?
What is a defining characteristic of an intentional event in a database context?
The deferred update method immediately reflects transaction operations in the physical database.
The deferred update method immediately reflects transaction operations in the physical database.
False
What are the three key characteristics of big data?
What are the three key characteristics of big data?
Volume, Velocity, Variety
A key-value database stores data as a collection of ______ pairs.
A key-value database stores data as a collection of ______ pairs.
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Match the following database types with their descriptions:
Match the following database types with their descriptions:
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What is the primary responsibility of a Data Administrator (DA)?
What is the primary responsibility of a Data Administrator (DA)?
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Database Administrators (DBA) are only responsible for database design.
Database Administrators (DBA) are only responsible for database design.
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What command is used to remove privileges from a user in a database?
What command is used to remove privileges from a user in a database?
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The _____ log is used to keep track of all transactions that update the database.
The _____ log is used to keep track of all transactions that update the database.
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Match the following SQL security concepts with their definitions:
Match the following SQL security concepts with their definitions:
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Which of the following is NOT a fixed-database role?
Which of the following is NOT a fixed-database role?
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A checkpoint helps to permanently store previous logs.
A checkpoint helps to permanently store previous logs.
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What must be considered when performing database backups?
What must be considered when performing database backups?
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Study Notes
Database Administration and Security
- Data Administrator (DA) is a management role overseeing corporate data resources (computerized and manual).
- DAs determine database contents and boundaries.
- Database Administrator (DBA) maintains database environments, ensuring data security and successful operations.
- DBAs design, implement, maintain, and secure database structures.
Characteristics of Data Administrator & Database Administrator
- DA has a managerial role, focusing on business data needs. They analyze and define policies, naming conventions, and standards.
- DBA has a technical role, handling data volumes and enforcement of policies. They maintain databases and programming standards.
SQL Security Concepts
- Users: Individuals or programs interacting with database objects.
- Objects: Database elements like tables, columns, indexes, and views, defined by SQL standards.
- Privileges: User permissions to manipulate database objects (e.g., SELECT, INSERT, DELETE, UPDATE).
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Roles: Named collections of access privileges that allow users to connect and utilize system resources.
- GRANT: A command used to provide access privileges to users on specific database objects.
- REVOKE: A command used to remove user privileges for actions on database objects.
- There are fixed-database roles (predefined) and user-defined roles (customizable).
Transaction Log & Checkpoints
- Transaction log records database updates.
- Checkpoints remove log entries, storing them permanently.
- Convenient & safe backup storage is crucial for multiple backups in different locations.
Database Recovery
- Database recovery restores a database to a previous state.
- Human-caused incidents (unintentional or intentional) can harm data. (e.g. deleting wrong rows, pressing wrong keys, shutting down database system).
- Deferred update recovers by transaction operations not immediately updating the database.
NoSQL Database Concepts
- Volume: Large data quantity stored in a database (characteristic of big data).
- Velocity: Big data's high input rate and data processing speed.
- Variety: Data comes in various formats and structures.
- Key-value (KV) databases store data as key-value pairs.
- Graph databases utilize graph theory to represent data (nodes, edges, properties) useful for social media data (e.g. facebook, twitter, instagram).
MongoDB
- MongoDB is a cross-platform, open-source, document-oriented database providing high performance, availability, and ease of scaling.
- SQL and MongoDB comparisons: show how database types have different conceptual layouts (tables, columns, rows in SQL vs. databases, collections, documents in MongoDB).
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Description
Explore the roles of Data Administrators and Database Administrators, from overseeing corporate data resources to ensuring database security. This quiz covers key concepts related to SQL security, user permissions, and database objects critical for effective data management.
