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- Transaction Transparency: Ensures that all distributed transactions maintain distributed database’s integrity and consistency. - Transaction Transparency: Ensures that all distributed transactions maintain distributed database’s integrity and consistency.
- Performance Transparency: must perform as if it were a centralized DBMS. - Performance Transparency: must perform as if it were a centralized DBMS.
- LATER advantages and disadvantages of distributed databases - LATER advantages and disadvantages of distributed databases
- Advantages
- • Reflects organizational structure
• Improved shareability and local autonomy
• Improved availability
• Improved reliability
• Improved performance
• Economics
• Modular growth
- Disadbantages
- • Complexity
• Cost
• Security
• Integrity control more difficult
• Lack of standards
• Lack of experience
• Database design more complex
- DONE XML - DONE XML
- LATER XML definition and basic concepts #flashcard - DONE XML definition and basic concepts #flashcard
id:: 648974ba-afab-457e-9633-488450e9e16f id:: 648974ba-afab-457e-9633-488450e9e16f
- eXtensible Markup Language - eXtensible Markup Language
- A meta-language (i.e. a language for describing other languages) that - A meta-language (i.e. a language for describing other languages) that
enables designers to create their own customised tags to provide enables designers to create their own customised tags to provide
functionality not available with HTML. functionality not available with HTML.
- LATER Relational model versus XML #flashcard - DONE Relational model versus XML #flashcard
id:: 648974ba-d417-4eef-be28-46cd5894c5c7 id:: 648974ba-d417-4eef-be28-46cd5894c5c7
- SQL - SQL
- is a special-purpose programming language - is a special-purpose programming language