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Posted by William Vaughn on 08/30/07 22:16
Snooping into the TDS would be the very last place I would look when trying
to improve performance. It would be like polishing a clean mirror to remove
one's zits.
--
____________________________________
William (Bill) Vaughn
Author, Mentor, Consultant, Dad, Grandpa
Microsoft MVP
INETA Speaker
www.betav.com
www.betav.com/blog/billva
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"Erland Sommarskog" <esquel@sommarskog.se> wrote in message
news:Xns999CEFDAB2FB4Yazorman@127.0.0.1...
> (raymond_b_jimenez@yahoo.com) writes:
>> I've seen a dump of the TDS traffic going from my webserver to the SQL
>> Server database and it seems encoded in Unicode (it has two bytes per
>> char). Seems it would have a huge impact on performance if it
>> travelled in one byte. Why might this be?
>
> I have never eavesdropped on TDS, but Unicode is indeed the character
> set of SQL Server. You are perfectly able to name your tables in
> Cyrillic or Hindi characters if you feel like. And of course character
> strings may include all sorts of characters. So an batch of SQL statement
> that is sent over the wire must be Unicode. That is beyond dispute.
>
> However, you don't encode something in Unicode. Unicode is the character
> set, and there are several encodings available, of which the most popular
> are UTF-16 and UTF-8. In UTF-8 each character in the base plane takes up
> 2 bytes, and characters beyond that takes up 4 bytes. (The base plane
> covers the vast majority of living langauges). In UTF-8, ASCII characters
> takes up one byte, other characters in the Latin, Greek and Cyrillic
> script takes two bytes, and Chinese and Japanese characters takes up three
> bytes.
>
> SQL Server uses UTF-16 exclusively. It is true that for network traffic
> in the western world, it would be more effective if TDS used UTF-8, but
> as you can see that it is necessarily the case in the Far East. And had
> TDS used UTF-8, both ends of the wire would have had to convert to
> UTF-16, so any reduced network traffic could be eaten up by extra CPU
> time.
>
>
> --
> Erland Sommarskog, SQL Server MVP, esquel@sommarskog.se
>
> Books Online for SQL Server 2005 at
> http://www.microsoft.com/technet/prodtechnol/sql/2005/downloads/books.mspx
> Books Online for SQL Server 2000 at
> http://www.microsoft.com/sql/prodinfo/previousversions/books.mspx
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