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A database had the following properties:
* Flat data: Data was usually represented in a tabular format with strings or numbers in each field.
* Multiple users: A conventional database needed to support more than one user or system logged into the same data at the same time.
* Transactions: An essential requirement for a database was to maintain integrity and consistency among data accessed by [[concurrent user]]s. These are the so-called [[ACID]] properties: Atomicity, Consistency, Isolation, and Durability.
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