An SQL-transaction is a unit of work that is performed against a database. Transactions are units or sequences of work accomplished in a logical order. Executing SQL-statements in Transactions, can ensure data integrity and handle database errors.
An SQL-transaction is a unit of work that is performed against a database. Transactions are units or sequences of work accomplished in a logical order.
A transaction is the propagation of one or more changes to the database. For example, creating, updating, or deleting a record from the table. Transactions are used to ensure data integrity and to handle database errors, by collecting SQL queries into a group and executing all of them together, as one unit of work.
Properties of Transactions: Transactions have the following four standard properties, usually referred to by the acronym ACID:
- Atomicity: ensures that all operations within the work unit are completed successfully; otherwise, the transaction is aborted at the point of failure, and previous operations are rolled back to their former state.
- Consistency: ensures that the database properly changes states upon a successfully committed transaction.
- Isolation: enables transactions to operate independently of and transparent to each other.
- Durability: ensures that the result or effect of a committed transaction persists in case of a system failure.
