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Read Committed Snapshot Isolation . You would get a result similar to the below. Sql server on the other hand was originally designed using pessimistic model but due to performance problems in it an option was later provided in sql server to enable optimistic concurrency control. READ COMMITTED SNAPSHOT ISOLATION and High version_ghost_record_count from www.red-gate.com Depending on your application this can either be a good or a bad thing. To find spid which cause same , you can refer below query. Once enabled, all transactions in this database are executed under read committed snapshot isolation and the setting read uncommitted on session level will not be honored.

Read Committed Vs Repeatable Read . With less storage requirements, it may store more useful data in the buffer pool. Repeatable read is sufficient for your case. PPT Transactions PowerPoint Presentation, free download ID1414869 from www.slideserve.com The repeatable read isolation level provides a guarantee that data will not change for the life of the transaction once it has been read for the first time. This has confused me because i don't think changing isolation level to read committed would significantly impact query time. Repeatable read is mysql’s default transaction isolation level.