Re: IBM AIX Kernel parameter limitations

The ten segment limits exist on a single process (aka instance) because the master oninit daemon allocates them at very initialization. If you have multiple instances, then _each_ of these instances can have (at max) 10 share memory segments. I've no problem in having 5 seperate instances on a single AIX machines, for example. Of course, if you have a HUGE database, the current AIX v4.1/2 has the limitation of 10x256MB share memory for your instance, but that's the other issue... Chris Greg Moye (cismail4.gmoye01@eds.com) wrote: : Oh, I'm not so sure. For perfectly good reasons you may want multiple : database instances on the same machine, or have an application (like : SAP) that requires some shared segments as well. Each Informix : instance requires at least 3. Not sure yet about SAP, but at least a : few per system appear to be unavoidable. Machines with the : aforementioned "screwy shared memory problems" are a major pain in the : backside in our environment. I doubt we're the only ones who find this : unacceptable, given that there are perfectly good alternatives. : Greg : Mark D. Stock wrote: : > : > Greg Moye wrote: : > > : > > Gee, you guys have a talent for picking machines with screwy shared : > > memory problems. I've read (no direct experience) that AIX/RS6K : > > machines have a hard limit of 10 shared memory segments. That's all. : > > Want more? Buy another box. : > : > But let's face it. If you're allocating ten segments, you have a poorly : > tuned system. :-) : > -- Chris Lo mailto: cklo@hk.super.net System Administrator/Informix DBA mailto: cklo@cklo.hk.super.net The Prudential Assurance (HK) Co. Ltd mailto: paclck@hk.net ============================================================================== -- Linux + FreeBSD + HPUX + Solaris + AIX ============================================================================== #include <std/disclaimer.h>