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Wednesday, July 11, 2012

Complete Phases of Transaction in Microsoft SQL Server

There are several phases of transaction in Microsoft sql server. These are following :

When transaction starts, database is in consistent state .

BEGIN TRANSACTION statement starts the transaction explicity.

Transaction generates the first record for data modification and write these records to log.

Modification starts one table at time, at this stage database is in inconsistent state.

Upon successful completion of all modification, database is once again consistent, and then application commits the transaction.

In case some errors occur, it rolls back all the modifications processed on data. This process returns the database to the point of consistency it was at before the transaction started.

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