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Ryan 2023-06-14 15:15:30 +08:00
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@ -1007,6 +1007,7 @@
- The instances of a potential subclass participate in a relationship unique to that subclass. - The instances of a potential subclass participate in a relationship unique to that subclass.
- DONE Block 3 - DONE Block 3
- DONE DB transaction management - DONE DB transaction management
- anomalies
- DONE ACID (Atomicity, Consistency, Isolation, Durability): A set of properties that guarantee the reliability and integrity of database transactions. - DONE ACID (Atomicity, Consistency, Isolation, Durability): A set of properties that guarantee the reliability and integrity of database transactions.
- Atomicity: The property that ensures a transaction is treated as a single, indivisible unit of work. It either executes all its operations successfully or rolls back to the initial state if any operation fails. - Atomicity: The property that ensures a transaction is treated as a single, indivisible unit of work. It either executes all its operations successfully or rolls back to the initial state if any operation fails.
- Consistency: The property that ensures a transaction transforms the database from one consistent state to another consistent state. It maintains data integrity and adheres to defined business rules. - Consistency: The property that ensures a transaction transforms the database from one consistent state to another consistent state. It maintains data integrity and adheres to defined business rules.
@ -1033,7 +1034,7 @@
validation checks, concurrency control mechanisms can ensure that validation checks, concurrency control mechanisms can ensure that
transactions are executed in a way that maintains data consistency and transactions are executed in a way that maintains data consistency and
serializability. serializability.
- DONE Recovery Control - ==DONE Recovery Control==
- DONE Some causes of database failure. - DONE Some causes of database failure.
- System crashes, resulting in loss of main memory. - System crashes, resulting in loss of main memory.
- Power failures - Power failures
@ -1103,14 +1104,13 @@
- Performance Transparency: must perform as if it were a centralized DBMS. - Performance Transparency: must perform as if it were a centralized DBMS.
- advantages and disadvantages of distributed databases - advantages and disadvantages of distributed databases
- DONE XML - DONE XML
collapsed:: true - LATER XML definition and basic concepts
- XML definition and basic concepts
collapsed:: true collapsed:: true
- 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.
- Relational model versus XML - LATER Relational model versus XML
collapsed:: true collapsed:: true
- SQL - SQL
collapsed:: true collapsed:: true
@ -1121,12 +1121,12 @@
- is a markup specification language - is a markup specification language
- You can: design ways of describing information (text or data), usually for storage, transmission, or processing by a program (you can use it in combination with a programming language). - You can: design ways of describing information (text or data), usually for storage, transmission, or processing by a program (you can use it in combination with a programming language).
- It says nothing about what you should do with the data (although your choice of element names may hint at what they are for). - It says nothing about what you should do with the data (although your choice of element names may hint at what they are for).
- Well-formed XML, Valid XML - LATER Well-formed XML, Valid XML
collapsed:: true collapsed:: true
- Adheres to basic structural requirements - Single root element - Adheres to basic structural requirements - Single root element
- Matched tags, proper nesting - Matched tags, proper nesting
- Unique attributes within elements - Unique attributes within elements
- DTD, XSD - LATER DTD, XSD
collapsed:: true collapsed:: true
- DTD: Defines the valid syntax of an XML document - DTD: Defines the valid syntax of an XML document
- XSD: a more comprehensive method of defining content model of - XSD: a more comprehensive method of defining content model of