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Assuming the second SSMS window is using the default READ_COMMITTED isolation level, you will see the before value instead of being blocked by the uncommitted transaction if the database has the READ_COMMITTED_SNAPSHOT …

int NOT NULL , quantity int NOT NULL , CONSTRAINT PK_Vote PRIMARY KEY CLUSTERED (userId, contentId) ); GO CREATE PROC dbo.CastVote @userId int ,@contentId int AS SET NOCOUNT ON; SET TRANSACTION … If the more common case is that users will cast more than 2 votes , you could reverse the logic and update first: CREATE PROC dbo.CastVote @userId int ,@contentId int AS SET NOCOUNT ON; SET TRANSACTION …

A rollback of a BCP batch transaction occurs when SQL Server errors occur during the bulk insert (e.g. constraint violations) but not due to client side errors (e.g. data type conversion during BCP parsing … Erred records are not sent to the server and are not part of a transaction. SQL Server errors will not only rollback the current batch but abort the entire BCP operation. …

If you execute an explicit ad-hoc SET XACT_ABORT ON, the setting remains in effect for the duration of the current session. Other session settings will remain unchanged. In the case of SET XACT_ABOR …

The general best practice is to perform transaction management in either the client application (SSIS), server-side T-SQL, but not both. … This technique helps avoid issues caused by long-running transactions, such as blocking and large transaction logs. …

The ROLLBACK TRANSACTION documentation is correct, albeit not clear without additional context. ROLLBACK is shorthand for the similar ROLLBACK WORK statement rather than ROLLBACK TRANSACTION. … Below is an excerpt from the ROLLBACK WORK doc page: ROLLBACK [ WORK ] [ ; ] This statement functions identically to ROLLBACK TRANSACTION except that ROLLBACK TRANSACTION accepts a user-defined transaction …

The transaction is left open as a result unless SET XACT_ABORT ON is specified. … BEGIN TRANSACTION; DELETE FROM Production.Product WHERE ProductID = 980; COMMIT TRANSACTION; END TRY BEGIN CATCH IF @@TRANCOUNT > 0 ROLLBACK TRANSACTION; DECLARE …

Below are relevant excerpts from the SET TRANSACTION ISOLATION LEVEL documentation. … Note that there is no mention of BEGIN TRANSACTION, COMMIT, etc. These transaction control statements do not affect the current session transaction isolation level. …

It's generally best to use stored procedures rather than triggers for business rules. Triggers are more appropriate to enforce data integrity rules in cases where declarative constraints can't be used …

In old versions of SQL Server, both operations were done in a single atomic transaction but this was notorious for locking system tables and causing excessive blocking. …

command.ExecuteReader() while($reader.Read()) { $hasBeginTransaction = Test-HasBeginTrasaction -procText $reader["definition"] if( $hasBeginTransaction ) { Write-Host "Has BEGIN TRANSACTION … $hasSetXactAbortOn ) { Write-Host "Has BEGIN TRANSACTION without SET_XACT_ABORT ON: $($reader["ProcedureName"])" } } $reader.Close() $connection.Close() } catch { …

Normally, other sessions will be blocked (due to locking) or will see the original value before changes (due to row versioning) until the transaction is committed. … Transaction isolation levels, and their implementation, are not related to transaction durability. It doesn't matter when log and data file writes occur for isolations levels to behave properly. …