Does Serializable transactions only lock out other transactionscope statements? or everything?

In a transaction i have the following, MyEntities is my context:

TransactionOptions options = new TransactionOptions();
options.Timeout = TimeSpan.FromMinutes(1);
options.IsolationLevel = IsolationLevel.Serializable;

 using(TransactionScope scope =

      new TransactionScope(TransactionScopeOption.Required, options))

    //Do something to database table MyEntities.Users


Does making my isolation level serializable, make it so that if anywhere else in my code I have something like this

MyEntities.Users.First(x=> == "test")

the line of code will wait until the transaction scope is completely done, or does that line of code need to be surrounded in a using(TrnasactionScope... statement in order for it to follow the rules of the transaction isolation level.


The isolation-level by itself does nothing; what matters is what happens when you start querying data. In particular, you start leaving read-locks all over the place, and key-range locks. If another query hits one of those locks and is reading, then that's fine: read-locks are usually compatible. The isolation-level of the other SPID also matters, obviously - a read-uncommitted SPID won't care about your ongoing operation, where-as higher isolations will.

What starts getting more complex is when one of the SPIDs starts writing data; that can lead to deadlocks if multiple SPIDs already have read-locks on that same data.

But no: a transaction-scope does not block everything else, especially if they are only reading. For what it does do... that is complex, and can only really be analysed on a case-by-case basis.

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