If you are using hardware clustering you take the same approach but when
you set up your server variables on all the web servers you must make sure
that only one of the web servers actually creates the tables in the database
and purges data from it. All of the web servers then must have the
datasource that points to this database that is storing the client variables
and then voila....you have true Load balancing!
------------------------------------------------------------------
Andrew Ewings
Project Manager
Thoughtbubble Ltd
------------------------------------------------------------------
-----Original Message-----
From: Craven, Joseph [mailto:[EMAIL PROTECTED]]
Sent: 11 September 2000 18:01
To: '[EMAIL PROTECTED]'
Subject: RE: Client Variables: Variable Caching
You can use a centralized database to store session variables...the setting
is found on the "Variables" page in CF Administrator. I don't know much
about hardware clustering, but that's about your only solution if you're
using a software-based clustering approach...
-----Original Message-----
From: Correa, Orlando (ITSC)
[mailto:[EMAIL PROTECTED]]
Sent: Monday, September 11, 2000 12:39 PM
To: '[EMAIL PROTECTED]'
Cc: Robar, Joseph (ITSC)
Subject: RE: Client Variables: Variable Caching
That's great news! Do you know how you'd deal with server
variables in a
clustered environment, since they don't span across multiple
servers...?
-----Original Message-----
From: Jeremy Allen [mailto:[EMAIL PROTECTED]]
Sent: Monday, September 11, 2000 10:11 AM
To: [EMAIL PROTECTED]
Subject: RE: Client Variables: Variable Caching
I certainly hope client variables cant be more than 255
characters
my program has been lying to me <G>
At least in our Client repository we use the text data type
which allows for arbitrary data size. I have stored some
pretty
huge stuff like a WDDX'd struct in the client cache, so I
think whatever the source it was slightly misinformed :))
Jeremy
-----Original Message-----
From: Correa, Orlando (ITSC)
[mailto:[EMAIL PROTECTED]]
Sent: Monday, September 11, 2000 12:03 PM
To: '[EMAIL PROTECTED]'
Subject: RE: Client Variables: Variable Caching
Ok... does anyone have any information on client variables
and the preferred
methods of using them with a database backend.
Also, in the Mastering ColdFusion 4.5 book, it states that
the maximum
length for a client variable is 255 chars. Is this
limitation due to the
varchar settings in the database or is it internal to
ColdFusion. Or could
you just increase the database to something like
varchar(500) in SQL Server
7.0
Any information is greatly appreciated.
Thanks,
Orlando Correa
IHS Web Team
Web Applications Developer, DBA
http://my.ihs.gov
-----Original Message-----
From: Correa, Orlando (ITSC)
[mailto:[EMAIL PROTECTED]]
Sent: Sunday, September 10, 2000 10:35 AM
To: '[EMAIL PROTECTED]'
Subject: Client Variables: Variable Caching
Anyone have more information....
On page 193 of the "Developing Web Applications with
ColdFusion 4.5" manual
there's a couple sentences on Variable Caching.
"All client variable reads and writes are cached to help
decrease the
overhead of client state management operations."
Does anyone have any details on exactly how the cache
behaves for both reads
and writes, timeouts, manipulating the cache, etc.
Thanks,
Orlando Correa
IHS WebTeam
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