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Atomicity

Transactions are often composed of multiple statements. Atomicity guarantees that each transaction is treated as a single "unit", which either succeeds completely, or fails completely: if any of the statements constituting a transaction fails to complete, the entire transaction fails and the database is left unchanged. An atomic system must guarantee atomicity in every situation, including power failures and errors/crashes. For example, a transfer of funds between two banks, even involving multiple changes such as debiting one account and crediting another, is a single transaction.

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Consistency

Consistency ensures that a transaction can only bring the database from one valid state to another, maintaining database invariants: any data written to the database must be valid according to all defined rules, including constraints, cascades, triggers, and any combination thereof. This prevents...

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Isolation

Transactions are often executed concurrently. Isolation ensures that concurrent execution of transactions leaves the database in the same state that would have been obtained if the transactions were executed sequentially. There are four layers: read uncommitted, read committed, repeatable reads a...

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Durability

Durability is the property which guarantees that transactions that have committed will survive permanently. For example, if a flight booking reports that a seat has successfully been booked, then the seat will remain booked even if the system crashes.

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ACID (atomicity, consistency, isolation, durability) is a set of properties of database transactions intended to guarantee data validity despite errors, power failures, and other mishaps. In the context of databases, a sequence of database operations that satisfies the ACID properties (which can ...

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More on Isolation - read phenomena

The ANSI/ISO standard SQL 92 refers to three different read phenomena when a transaction reads data that another transaction might have changed. These are dirty reads (when a transaction is allowed to read data from a row that has been modified by another running transact...

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ACID (atomicity, consistency, isolation, durability) is a set of properties of database transactions intended to guarantee data validity despite errors, power failures, and other mishaps. In the context of databases, a sequence of database operations that satisfies the ACID properties (which can ...

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