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- LATER advantages and disadvantages of distributed databases
- DONE XML
- LATER XML definition and basic concepts #flashcard
id:: 648974ba-afab-457e-9633-488450e9e16f
- eXtensible Markup Language
- A meta-language (i.e. a language for describing other languages) that
enables designers to create their own customised tags to provide
functionality not available with HTML.
- LATER Relational model versus XML #flashcard
id:: 648974ba-d417-4eef-be28-46cd5894c5c7
- SQL
- is a special-purpose programming language
- You can: manage data in a relational databases.
@ -1145,6 +1147,7 @@
- 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).
- LATER Well-formed XML, Valid XML #flashcard
id:: 648974ba-fb70-4207-8010-a8ddda35ccf7
- Adheres to basic structural requirements - Single root element
- Matched tags, proper nesting
- Unique attributes within elements
@ -1155,40 +1158,50 @@
- LATER Practice reading and writing XML, XSD
- DONE Data Mining
- concept #flashcard
id:: 648974ba-bf4c-4046-b7ce-510596ad421a
- The process of extracting valid, previously unknown, comprehensible,
and actionable information from large databases and using it to make
crucial business decisions.
- different applications #flashcard
id:: 648974ba-7440-4ac2-8730-b33e9f50570c
- Retail / Marketing
- Banking
- Insurance
- Medicine
- basic techniques
- predictive modelling, #flashcard
id:: 648974ba-a007-420c-87db-1a029c1a39e6
- uses observations to form a model of the important characteristics of some
phenomenon
- database segmentation, #flashcard
id:: 648974ba-18a0-474e-96de-6a824969d0ec
- Uses unsupervised learning to discover homogeneous subpopulations in a database to improve the accuracy of the profiles.
- link analysis, #flashcard
id:: 648974ba-0868-469f-9b8f-94a44163c87f
- Establishing links, called associations, between the individual
records, or sets of records, in a database.
- deviation detection. #flashcard
id:: 648974ba-a77e-47ba-9f0d-6ed14e880333
- Identifies outliers, which express deviation from some previously
known expectation and norm.
- DONE NoSQL
- the motivation for NoSQL #flashcard
id:: 648974ba-91af-424f-b392-928e947740de
- By giving up ACID constraints, one can achieve
much higher performance and scalability.
- explain the concepts of NoSQL #flashcard
id:: 648974ba-370b-44a8-9474-5b58d1d0dd28
- NoSQL databases (aka "not only SQL") are non-tabular databases and store
data differently than relational tables. NoSQL databases come in a
variety of types based on their data model. The main types are document,
key-value, wide-column, and graph. They provide flexible schemas and
scale easily with large amounts of data and high user loads.
- explain the application areas of NoSQL #flashcard
id:: 648974ba-b39b-47b7-8b9f-ca9250bef8ba
- NoSQL is an alternative, non-traditional DB technology to be
used in large scale environments where (ACID) transactions are not a priority.
- CAP theorem: #flashcard
id:: 648974ba-910d-42ae-89a9-5017194f6827
- There are 3 main properties for distributed management:
1. Consistency → A data item has the same value at the same time (to
ensure coherency).