Just as an aside, if you want to stop deadlocks from occurring, I have had great success by just doing index optimization, i.e. I think versioning in Tempdb is something to consider when changing the default isolation level at the DB level. Not sure how intrusive the allowsnapshot is. Since it is a DB alter, you probably cannot have transactions or connections to the db when this change is done. I will leave it to the tattooed ScaryDBA or GilaMonster to let us know about the gotcha's when trying to apply the changes on a production DB. If you choose to ALTER DATABASE AdventureWorks2014 SET READ_COMMITTED_SNAPSHOT ON then all queries will inherit the default isolation level and you won't have to manually set it in each proc or query. Set transaction isolation level snapshot within the proc or before the query batch. Then, for the queries, sessions, or procedures you choose to use snapshot, you will have to To be able to use snapshot isolation, you have toĪLTER DATABASE AdventureWorks2014 SET ALLOW_SNAPSHOT_ISOLATION ON Is it possible to set in the transaction level for some queries or do we need to change entire database isolation level by using alter database "ALTER DATABASE AdventureWorks2008R2 SET READ_COMMITTED_SNAPSHOT ON" But we want change isolation level to read comitted snapshot isolation and test it to avoid deadlocks. The transactions also using readcommitted. One of our Production database is using default isolation Readcommitted.
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