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Old 02-29-2008, 02:22 AM
CTG
 
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Default 2 Qs
1- What is a transaction?

2-How does Sever & Client communicate ?


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  #2 (permalink)  
Old 02-29-2008, 02:22 AM
Simon Hayes
 
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Default Re: 2 Qs
"CTG" <s99@NOSPAMparadise.net.nz> wrote in message news:<a3ncc.7050$u%1.744755@news02.tsnz.net>...
> 1- What is a transaction?
>
> 2-How does Sever & Client communicate ?

1. A number of operations that succeed or fail together, as a unit.
One classic example is transferring money from account A to account B
- the money is deducted from account A, and added to account B. But it
can never be allowed that if the server fails in the middle, then the
money is deducted from A but not added to B. By putting this in a
transaction, both operations will happen or neither, so the balances
will always be correct.

2. MSSQL uses the proprietary TDS protocol over the standard network
protocols (TCP/IP or whatever).

There is lots of information in Books Online about transactions, or
you might want to find a general book on databases.

Simon
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