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Message Posted: Fri, 16 Apr 2004 @ 20:36:57 GMT
We have set up DNS entries for both ODBC connections and a CLI connections.
When using DNS, if you select the "do not resolve the alias name to IP address" checkbox, you are telling ODBC that you are checking and resolving this 'name to IP address', right now, at the time you are configuring the ODBC connection. If this checkbox is not selected (unchecked) the 'name to IP address' resolution will occur each time you connect to your server (or node). If your DNS name\IP config does not change much you may want this checked; but, it is safer to leave it unchecked so that ODBC checks the 'name to IP' resolution each time you connect.
DNS NAME IP ADDRESS prodnode1 xx.xx.xx.xx prodnode2 xx.xx.xx.xx ....and so on
NAME IP ADDR ALIAS devsysCOP1 xx.xx.xx.xx devsys (DNS alias and your Database Name) devsysCOP2 xx.xx.xx.xx devsys (DNS alias and your Database Name) ...and so on. prdsysCOP1 xx.xx.xx.xx prdsys (DNS alias and your Database Name) prdsysCOP2 xx.xx.xx.xx prdsys (DNS alias and your Database Name) ...and so on.
So when connecting through any CLI application I would use prdsys or devsys as the Database Name for these applications.
I never really understood the COPx portion of this name but I have heard that it is a legacy type naming system that identifies, or identified, the system as one single system - perhaps someone else could contribute to this. This is probably why I am concerned about rolling out this"alias" type setup to our masses; we are concerned about balanced distribution of sessions. On the mainframe there is the TDP which handles the even distribution of these sessions. On a LAN based client the TDP is replaced with the MTDP and we are not sure whether the distribution of sessions will be balanced when integrated with DNS in this manner - i.e. does DNS do a round-robin distribution to the different IP addresses for your aliased system name; and then, if it does, do you assume that Teradata then handles the even distribution of sessions - does the COPx name even come into play? We need to do some further testing.
Hope this helps or at least furthers the discussion around the name to IP address resolution.
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