Applies To: SQL Server 2014, SQL Server 2016 Preview
Topic Status: Some information in this topic is preview and subject to change in future releases. Preview information describes new features or changes to existing features in Microsoft SQL Server 2016 Community Technology Preview 2 (CTP2).
Binds or unbinds a session to other sessions in the same instance of the SQL Server Database Engine. Binding sessions allows two or more sessions to participate in the same transaction and share locks until a ROLLBACK TRANSACTION or COMMIT TRANSACTION is issued.
This feature will be removed in a future version of Microsoft SQL Server. Avoid using this feature in new development work, and plan to modify applications that currently use this feature. Use Multiple Active Results Sets (MARS) or distributed transactions instead. For more information, see Using Multiple Active Result Sets (MARS).
Applies to: SQL Server (SQL Server 2008 through current version).
Two sessions that are bound share only a transaction and locks. Each session retains its own isolation level, and setting a new isolation level on one session does not affect the isolation level of the other session. Each session remains identified by its security account and can only access the database resources to which the account has been granted permission.
sp_bindsession uses a bind token to bind two or more existing client sessions. These client sessions must be on the same instance of the Database Engine from which the binding token was obtained. A session is a client executing a command. Bound database sessions share a transaction and lock space.
A bind token obtained from one instance of the Database Engine cannot be used for a client session connected to another instance, even for DTC transactions. A bind token is valid only locally inside each instance and cannot be shared across multiple instances. To bind client sessions on another instance of the Database Engine, you must obtain a different bind token by executing sp_getbindtoken.
sp_bindsession will fail with an error if it uses a token that is not active.
Unbind from a session either by using sp_bindsession without specifying bind_token or by passing NULL in bind_token.
The following example binds the specified bind token to the current session.
The bind token shown in the example was obtained by executing sp_getbindtoken before executing sp_bindsession.
USE master; GO EXEC sp_bindsession 'BP9---5---->KB?-V'<>1E:H-7U-]ANZ'; GO