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This behavior is called serializability and is usually implemented by locking the specific rows in the table. That is, the effect of running a set of transactions is the same as running them one at a time. Isolated: The transaction executes as if it were running alone, with no other transactions.If you execute the transaction all by itself on a database that’s initially consistent, then when the transaction finishes executing the database is again consistent. Consistent: The transaction preserves the internal consistency of the database.The failure of a transaction is called abort. The successful completion of a transaction is called commit. That is, if any steps between the transactions fail, all other steps must also fail or be reverted. Atomic: Atomicity controls guarantee that all the steps in a transaction are completed successfully as a group.Thus OLTP systems must comply with atomic, consistent, isolated, and durable (ACID) properties to ensure the accuracy of the data in the system. If there is any error in any one of the steps, the entire transaction must be aborted and all the steps must be deleted from the system. A transaction is recorded correctly only if all the steps involved are executed and recorded. It may be complete when all parties involved acknowledge the transaction, or when the product/service is delivered, or when a certain number of updates are made to the specific tables in the database.
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A transaction is usually an execution of a program that may require the execution of multiple steps or operations.
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These transactions traditionally are referred to as economic or financial transactions, recorded and secured so that an enterprise can access the information anytime for accounting or reporting purposes. OLTP or Online Transaction Processing is a type of data processing that consists of executing a number of transactions occurring concurrently-online banking, shopping, order entry, or sending text messages, for example.