What is ACID fundamental? What are transactions in SQL SERVER
What is ACID fundamental? What are transactions in SQL SERVER ?
A transaction is a sequence of operations performed as a single logical unit of work. A
logical unit of work must exhibit four properties, called the ACID (Atomicity, Consistency,
Isolation, and Durability) properties, to qualify as a transaction:
A transaction must be an atomic unit of work; either all of its data modifications are performed or none of them is performed.
When completed, a transaction must leave all data in a consistent state. In a relational database, all rules must be applied to the transaction's modifications to maintain all data integrity. All internal data structures, such as B-tree indexes or doubly-linked lists, must be correct at the end of the transaction.
Modifications made by concurrent transactions must be isolated from the modifications made by any other concurrent transactions. A transaction either see data in the state it was before another concurrent transaction modified it, or it sees the data after the second transaction has completed, but it does not see an intermediate state. This is referred to as serializability because it results in the ability to reload the starting data and replay a series of transactions to end up with the data in the same state it was in after the original transactions were performed.
After a transaction has completed, its effects are permanently in place in the system. The modifications persist even in the event of a system failure.
2007-10-25, 4980👍, 0💬
What is the concept of XPOINTER? XPOINTER is used to locate data within XML document. XPOINTER can p...
How To Calculate Expressions with SQL Statements? - MySQL FAQs - Introduction to SQL Basics There is...
What are the different elements in Functions points? The different elements in function points are a...
What is CAR (Causal Analysis and Resolution)? The basic purpose of CAR is to analyze all defects, pr...
Can you explain different software development life cycles -part II? Water Fall Model This is the ol...