A database transaction is a performed within a database management system (DBMS) and typically consists of one or more in the form of SQL statements. The main goal of a transaction is to ensure and integrity, especially in environments where multiple users may access the database concurrently.
The transaction process begins with the statement, signaling the start of a unit of work. Afterward, SQL statements such as INSERT, UPDATE, or DELETE are executed to effect changes in the database. Once these statements are executed, the transaction can be either to make the changes permanent or to undo the changes if necessary.
The ACID approach encompasses four key properties that ensure the reliability of database transactions: , , , and . Atomicity means that a transaction is treated as a single, indivisible unit, ensuring that either all changes are committed, or none are. Consistency ensures the database transitions from one valid state to another, while Isolation guarantees that the execution of one transaction does not affect others. Finally, Durability ensures that once a transaction is committed, its effects are permanent, even in the event of system failures.
The transaction process begins with the statement, signaling the start of a unit of work. Afterward, SQL statements such as INSERT, UPDATE, or DELETE are executed to effect changes in the database. Once these statements are executed, the transaction can be either to make the changes permanent or to undo the changes if necessary.
The ACID approach encompasses four key properties that ensure the reliability of database transactions: , , , and . Atomicity means that a transaction is treated as a single, indivisible unit, ensuring that either all changes are committed, or none are. Consistency ensures the database transitions from one valid state to another, while Isolation guarantees that the execution of one transaction does not affect others. Finally, Durability ensures that once a transaction is committed, its effects are permanent, even in the event of system failures.
Keywords
unit of work | begin transaction | durability | committed | operations | atomicity | data consistency | consistency | isolation | rolled back |