Databases

  • — What is a database?
    • — Somethign where you put information and expect that to stay forever.
    • — Provides data and interface for operations that can be done on them.
  • — Why is persistence important?
    • — Process start and store information in memory and when thye end the data is gone
    • — To survive process dying and machine shutting down and getting up
  • — Data stored as files bu implementaton hiddne
  • — Types
    • — Relational
      • — Tables with strict schem
      • — Reduce duplicatoin and all kinds of queries possible
    • — Document
      • — One document stored as itself.
      • — Tree structure
    • — Column database
      • — Given a key you can find the value of that in each column there is?
    • — Graph databse
    • — Key-Value stores
  • — CAP theorem
    • — You can't have all three of consistency, availability and partitian telerence
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