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Transactions are a powerful weapon in the hands of a programmer, but improper use can cause substantial damage. I will try to forewarn you of some typical problems.

In case of an error, you might get a message similar to this one:

The worst thing that you can do is to open a transaction and then forget to close it. All changes sent to the database through that connection will become part of that transaction; resources normally

pages might never get on the free list, even without their objects being pinned which is as it should be. Protection against media failure is achieved using whatever level of RAID (redundant array of independent disks) technology you choose. Write-ahead logging in conjunction with RAID protection ensures that you never lose a transaction. (However, a good backup strategy is still essential in case of certain situations, such as when an administrator accidentally clobbers a table.) SQL Server always opens its files by instructing the operating system to write through any other caching that the operating system might be doing. Hence, SQL Server ensures that transactions are atomic even a sudden interruption of power results in no partial transactions existing in the database, and all completed transactions are guaranteed to be reflected. (It is crucial, however, that a hardware disk-caching controller not lie and claim that a write has been completed unless it really has been or will be.)

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6:

released at the end of a transaction are held indefinitely; other users cannot access resources; and eventually, your server chokes.

A transaction can span batches. SQL Server counts transactions over the connection, so it is legal to issue two batches like this over one connection:

Begin Transaction update Inventory set Lease = 0 where LeaseScheduleId = 141 Go update LeaseSchedule Set PeriodicTotalAmount = 0 where ScheduleId = 141 Commit Transaction Go

However, I cannot think of any justification for doing so, and you significantly increase the probability of error. For example, you could easily forget to finish the transaction.

<Root xmlns:sql="urn:schemas-microsoft-com:xml-sql"> < MSSQLError HResult="0x80004005" Source="Microsoft XML Extensions to SQL Server" Description="Specified attribute or element ('Inventoryid') does not have a corresponding mapping in the schema, and no overflow field defined" > </Root>

Transaction names and savepoint names do not bring much value to your solutions, but they do bring additional risks. There are too many rules that you need to keep in mind. It is best not to use them at all.

Sometimes you might set your error handling so that all errors that occur in a stored procedure are treated in the same way. Naturally,

you will include a statement to roll back the transaction. If an error occurs before the transaction starts, the stored procedure will jump to the error handling code and another error will occur:

Create Procedure prClearLeaseShedule_1 -- Set value of Lease of all equipment associated -- with expired Lease Schedule to 0 -- Set total amount of Lease Schedule to 0. @intLeaseScheduleId int As -- Verify that lease has expired If GetDate() < (select EndDate from LeaseSchedule where ScheduleId = @intLeaseScheduleId) raiserror ('Specified lease schedule has not expired yet!', 16,1) -- If error occurs here, -- server will execute Rollback before transaction is started! if @@Error <> 0 goto PROBLEM Begin Transaction -- Set value of Lease of all equipment associated -- with expired Lease Schedule to 0 update Inventory set Lease = 0 where LeaseScheduleId = @intLeaseScheduleId if @@Error <> 0 goto PROBLEM -- Set total amount of Lease Schedule to 0 update LeaseSchedule Set PeriodicTotalAmount = 0 where ScheduleId = @intLeaseScheduleId if @@Error <> 0 goto PROBLEM commit transaction return 0

6:

Order Types The OrderType table is used as a lookup table to store the general requirements of the order. It contains values such as

I have mentioned before that DiffGrams are designed primarily as an internal format for storing DataSet changes. Therefore, I have created a program that loads a DataSet object, makes a change in it, and then stores the change in a DiffGram file:

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