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José da Cruz

Enterprise Architect, and Life Thinker

José da Cruz

Enterprise Architect, and Life Thinker

ACID

josedacruz, September 10, 2023

ACID

is an acronym used in databases to describe the properties associated with the input-output operations on the data.

  • A: Atomicity: A transaction is a single unit. All or nothing. No data is discarded.
  • A: Atomicity: Ex: deleting 3 rows should remove the 3 rows or none.
  • C: Consistency: The integrity of the data and relationships is maintained after any transaction committed.
  • C: Consistency: Ex: you can’t remove a user with associated receipts, invoices, etc.
  • I: Isolation: Multiple transactions can happen in parallel without leading to inconsistency.
  • I: Isolation: Ex: If two transactions change the same data, the change doesn’t affect each other’s data.
  • I: Isolation: Databases, usually allow different levels of isolation.
  • D: Durability: After a transaction is committed, no data can be lost for any reason.
  • D: Durability: Ex: If a system failure happens, the committed transactions are guaranteed to remain.

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