Re: Multiple Residency & Shared Memory
In addition... You will want to start
each database as a different users. Why?
Because it is easier to track Shared Memory,
by owner.
>From: "Art S. Kagel" <kagel@bloomberg.net>
>Reply-To: kagel@bloomberg.net
>To: informix-list@iiug.org
>Subject: Re: Multiple Residency & Shared Memory
>Date: Tue, 30 May 2000 15:45:53 -0400
>
>tslusser@bigfoot.com wrote:
> >
> > Hi,
> > I want to initiate a second instance of Informix OnLine server 7.23.UC1
> > on Solaris 2.6. My question is "Do I need to set a different shared
> > memory base address or can both instances use the same shared memory
> > segments?" How would I calculate the shared memory base address for
> > the second instance if it is necessary?
>
>No, the shared memory base address is just the address at which the
>engine's
>executables will attach shared memory when they attach to it. It is an
>internal address and is platform dependent. Leave that value the same in
>both ONCONFIG files. The value that has to differ for each instance is the
>SERVERNUM parameter in the ONCONFIG file. It is added to a base key number
>to generate a unique, per instance, shared memory key. The base key is
>0x52564800 to which is added 0x10000 * SERVERNUM plus the segment number
>(ie the first or RESIDENT segment for SERVERNUM=1 will have a key of
>0x52574801 while the first VIRTUAL segment for SERVERNUM=16 will have a key
>of 0x52664802, etc.). Just translate the key column in the onstat -g seg
>report to hex to see this effect.
>
>Art S. Kagel
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