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What is ACID?

ACID means atomicity, consistency, isolation and durability.

1. Atomicity:Each transaction is said to be “atomic".Means if any part of transaction fail then whole transaction failed.In a word say "ALL OR NOTHING".The failure of transaction commanaly depend on Hard disk fail,System crash.

2. Consistency:Consistency means only valid data will be written to the database.If any transaction voilate any consistency rule of database the whole transaction is Rollback, means it starts again from beggining.Each state in transaction must be consistent for database.

3. Isolation: If two transactions occures at a time then both are not impact to each other,seperate complition of each transaction. The isolation property does not ensure which transaction will execute first, merely that they will not interfere with each other.If second transaction depend on frist then it will done, and data update after complition of traction.

Durability:Ensures that any transaction committed to the database will not be lost. Durability is ensured through the use of database backups and transaction logs that facilitate the restoration of committed transactions in spite of any subsequent software or hardware failures.

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