Database transactions

Business (transaction) Is a series of operations performed as a single logical unit of work , These operations are submitted to the system as a whole , Or both , Either not .

Transactions have the following four attributes , abbreviation ACID;

Atomicity (Atomicity)： A transaction is a complete operation . The steps of a transaction are inseparable （ Atomic ）, Or both , Either not ;

Uniformity (Consistency)： When the transaction is complete , The data must be in a consistent state ;

Isolation, (Isolation)： All concurrent transactions that modify data must be isolated , This means that the business must be independent , It should not rely on or influence other matters in any way ;

Permanence (Durability)： After the transaction completes , Its changes to the database are persisted , The transaction log can keep the transaction permanent ;