Is it possible to set DEFAULT TRANSACTION ISOLATION for all connections in SQL Server?

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I want the default Transaction Isolation level to be SNAPSHOT.



How do I set this on a SQL Server 2016 database?






sql-server sql-server-2016 snapshot-isolation







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    There's not a server or database level setting for this, but sometimes it can be set via the app connection string.
    – sp_BlitzErik
    54 mins ago

















up vote
2
down vote

favorite












I want the default Transaction Isolation level to be SNAPSHOT.



How do I set this on a SQL Server 2016 database?






sql-server sql-server-2016 snapshot-isolation







share|improve this question



















  • 1




    There's not a server or database level setting for this, but sometimes it can be set via the app connection string.
    – sp_BlitzErik
    54 mins ago













up vote
2
down vote

favorite









up vote
2
down vote

favorite











I want the default Transaction Isolation level to be SNAPSHOT.



How do I set this on a SQL Server 2016 database?






sql-server sql-server-2016 snapshot-isolation







share|improve this question















I want the default Transaction Isolation level to be SNAPSHOT.



How do I set this on a SQL Server 2016 database?






sql-server sql-server-2016 snapshot-isolation




sql-server sql-server-2016 snapshot-isolation






share|improve this question















share|improve this question













share|improve this question




share|improve this question








edited 52 mins ago









Paul White♦

47.9k14257407




47.9k14257407










asked 1 hour ago









Inquisitor Shm

1232




1232







  • 1




    There's not a server or database level setting for this, but sometimes it can be set via the app connection string.
    – sp_BlitzErik
    54 mins ago













  • 1




    There's not a server or database level setting for this, but sometimes it can be set via the app connection string.
    – sp_BlitzErik
    54 mins ago








1




1




There's not a server or database level setting for this, but sometimes it can be set via the app connection string.
– sp_BlitzErik
54 mins ago





There's not a server or database level setting for this, but sometimes it can be set via the app connection string.
– sp_BlitzErik
54 mins ago











1 Answer
1






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up vote
5
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It is not possible to configure Snapshot Isolation (SI) as the default isolation level.



To use SI, the database must be enabled for Snapshot Isolation:



ALTER DATABASE CURRENT
SET ALLOW_SNAPSHOT_ISOLATION ON;


Then each connection must explicitly request SI, using for example:



SET TRANSACTION ISOLATION LEVEL SNAPSHOT;


It is possible to set the default Read Committed isolation level to use row versioning (RCSI).



If Read Committed Snapshot Isolation (RCSI) is sufficient for your purposes, the setting is:



ALTER DATABASE CURRENT
SET READ_COMMITTED_SNAPSHOT ON;


Further reading:




  • Snapshot Isolation in SQL Server (documentation)


  • How to set the default transaction isolation level server wide? by Nacho Alonso Portillo





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    up vote
    5
    down vote













    It is not possible to configure Snapshot Isolation (SI) as the default isolation level.



    To use SI, the database must be enabled for Snapshot Isolation:



    ALTER DATABASE CURRENT
    SET ALLOW_SNAPSHOT_ISOLATION ON;


    Then each connection must explicitly request SI, using for example:



    SET TRANSACTION ISOLATION LEVEL SNAPSHOT;


    It is possible to set the default Read Committed isolation level to use row versioning (RCSI).



    If Read Committed Snapshot Isolation (RCSI) is sufficient for your purposes, the setting is:



    ALTER DATABASE CURRENT
    SET READ_COMMITTED_SNAPSHOT ON;


    Further reading:




    • Snapshot Isolation in SQL Server (documentation)


    • How to set the default transaction isolation level server wide? by Nacho Alonso Portillo





    share|improve this answer


























      up vote
      5
      down vote













      It is not possible to configure Snapshot Isolation (SI) as the default isolation level.



      To use SI, the database must be enabled for Snapshot Isolation:



      ALTER DATABASE CURRENT
      SET ALLOW_SNAPSHOT_ISOLATION ON;


      Then each connection must explicitly request SI, using for example:



      SET TRANSACTION ISOLATION LEVEL SNAPSHOT;


      It is possible to set the default Read Committed isolation level to use row versioning (RCSI).



      If Read Committed Snapshot Isolation (RCSI) is sufficient for your purposes, the setting is:



      ALTER DATABASE CURRENT
      SET READ_COMMITTED_SNAPSHOT ON;


      Further reading:




      • Snapshot Isolation in SQL Server (documentation)


      • How to set the default transaction isolation level server wide? by Nacho Alonso Portillo





      share|improve this answer
























        up vote
        5
        down vote










        up vote
        5
        down vote









        It is not possible to configure Snapshot Isolation (SI) as the default isolation level.



        To use SI, the database must be enabled for Snapshot Isolation:



        ALTER DATABASE CURRENT
        SET ALLOW_SNAPSHOT_ISOLATION ON;


        Then each connection must explicitly request SI, using for example:



        SET TRANSACTION ISOLATION LEVEL SNAPSHOT;


        It is possible to set the default Read Committed isolation level to use row versioning (RCSI).



        If Read Committed Snapshot Isolation (RCSI) is sufficient for your purposes, the setting is:



        ALTER DATABASE CURRENT
        SET READ_COMMITTED_SNAPSHOT ON;


        Further reading:




        • Snapshot Isolation in SQL Server (documentation)


        • How to set the default transaction isolation level server wide? by Nacho Alonso Portillo





        share|improve this answer














        It is not possible to configure Snapshot Isolation (SI) as the default isolation level.



        To use SI, the database must be enabled for Snapshot Isolation:



        ALTER DATABASE CURRENT
        SET ALLOW_SNAPSHOT_ISOLATION ON;


        Then each connection must explicitly request SI, using for example:



        SET TRANSACTION ISOLATION LEVEL SNAPSHOT;


        It is possible to set the default Read Committed isolation level to use row versioning (RCSI).



        If Read Committed Snapshot Isolation (RCSI) is sufficient for your purposes, the setting is:



        ALTER DATABASE CURRENT
        SET READ_COMMITTED_SNAPSHOT ON;


        Further reading:




        • Snapshot Isolation in SQL Server (documentation)


        • How to set the default transaction isolation level server wide? by Nacho Alonso Portillo






        share|improve this answer














        share|improve this answer



        share|improve this answer








        edited 41 mins ago

























        answered 52 mins ago









        Paul White♦

        47.9k14257407




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