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Questions and Answers
What major technological advancement characterized the 1990s?
What major technological advancement characterized the 1990s?
- The development of open-source databases
- The introduction of XQuery for database queries
- The rise of XML technologies
- The explosive growth of the World Wide Web (correct)
Which database technology emerged in the early 2000s as a significant trend?
Which database technology emerged in the early 2000s as a significant trend?
- Increased use of flat-file databases
- Adoption of XML and XQuery (correct)
- Shift towards exclusively NoSQL databases
- Relational databases becoming obsolete
What does the term 'metadata' refer to in the context of databases?
What does the term 'metadata' refer to in the context of databases?
- The final processed results derived from raw data
- The structured information used for data analysis
- Data that describe the properties and context of end-user data (correct)
- The raw data before any processing
Which of the following statements about the 2000s is true?
Which of the following statements about the 2000s is true?
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What does 24×7 availability mean in the context of database systems?
What does 24×7 availability mean in the context of database systems?
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Study Notes
The 1990s
- The 1990s saw the explosive growth of the World Wide Web.
- Databases were deployed more extensively than ever before.
- Database systems were required to support very high transaction-processing rates.
- Database systems needed to support very high reliability and 24/7 availability.
- Database systems also had to support Web interfaces to data.
The 2000s
- XML and the associated XQuery emerged as a new database technology.
- XML is used for data exchange and storing complex data types.
- Relational databases remain at the core of most large-scale database applications.
- "Autonomic computing/auto-admin" techniques gained traction to reduce system administration effort.
- Open-source database systems, like PostgreSQL and MySQL, saw significant growth in usage.
Basic Concepts and Definitions
- Data is raw, unprocessed information stored in a computer media.
- Information is derived from analyzing data.
- Metadata describes the properties and context of data.
- Metadata typically includes data names, definitions, length, and allowable values.
- Metadata is also known as "data about data".
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