A Transaction Is A Logical Unit Of Database Processing That Includes One Or More Database Access Operations Such As An Insertion, Deletion, Modification, And Retrieval.
2、 uniformity ： it means that the execution of a transaction cannot destroy the integrity and consistency of the database data , a transaction before and after. Transaction supports what is known as the acid properties: Transactions manage sequences of sql statements that must be executed as a single unit of work, so that the database never contains the results of partial operations.
One Or More Data Manipulation Language (Dml) Statements That Together Constitute An Atomic Change To The Database.
If a transaction encounters errors and must be canceled or rolled back, then all of the data modifications are erased. When you reach your limitation of transaction log size you get this. The concept of transactions is motivated by two completely independent concerns.
Operational Database Of Customer Transactions.
Specifically, a transaction consists of one of the following: A transaction is the logical work unit that performs a single activity or multiple activities in a database. A database transaction is a logical unit of processing in a dbms which entails one or more database access operation.
This Unit Of Work Typically Satisfies A User Request And Ensures Data Integrity.
Transactional database may refer to: A transaction is one or more sql statements that make up a unit of work performed against the database, and either all the statements in a transaction are committed as a unit or all the statements are rolled back as a unit. A database transaction consists of one or more statements.
Experts Talk About A Database Transaction As A “Unit Of Work” That Is Achieved Within A Database Design Environment.
If a transaction is successful, all of the data modifications made during the transaction are committed and become a permanent part of the database. When a transaction makes multiple changes to the database, either all the changes succeed when the transaction is committed, or all the changes are undone when the transaction is. The four characteristics of things (acid) 1、 atomicity ： a transaction consists of a sequence of atomic operations , all operations are either successful , either all failures roll back.