LearningSQL

An article by Puru Pathak.  Date - 14/6/21 Isolation determines how transaction integrity is visible to other users and systems. It means that a transaction should take place in a system in such a way that it is the only transaction that is accessing the resources in a database system. Isolation levels define the degree to which a transaction must be isolated from the data modifications made by any other transaction in the database system. A transaction isolation level is defined by the following phenomena – F ollowing are the different types of isolations available in SQL Server. READ COMMITTED READ UNCOMMITTED REPEATABLE READ SERIALIZABLE SNAPSHOT Dirty Read –  A Dirty read is a situation when a transaction reads data that has not yet been committed. For example, Let’s say transaction 1 updates a row and leaves it uncommitted, meanwhile, Transaction 2 reads the updated row. If transaction 1 rolls back the change, transaction 2 will have read data that is considered...