> -----Original Message-----
> From: IBM Mainframe Discussion List On Behalf Of John S. Giltner, Jr.
>
> Gerry Borja wrote:
> > I have been monitoring our single CICS region which has been hitting
> > the single TCB limit lately. I have checked the WLM service class
> > report and found out that APPL% was beyond 100% (up to 120-130%)
> > during peak period. My question is how come the RMF and the
monitoring
> > tool (TMON) are reporting it to be more than 100% when this CICS
> > region can only use one CP? How to interpret this? 20-30%
> > waiting/queueing to execute?
>
> CICS has 3 TCB's (as long as you are not running applications
> in thread safe mode, in which case it can have more).
>
> I beleive that:
>
> One for user dispatched work.
That would be the "QR" TCB, where the CICS dispatcher and "all"
applications run.
> One for VSAM I/O.
This one, the "CO" TCB, is optional; enabled via the SUBTSKS parm in
DFHSIT.
> One for CICS system stuff.
The "RO" TCB, on which sign-on and sign-off, among other things, are
processed.
> Also, if you are CICS TS2.2 or newer (I think it is 2.2)
Correct.
> there is a 4th TCB for DB2 work. I know in one level of CICS
> TS that DB2 workload moved off to new TCB(s).
"Normally" one would specify more than one of these new "L8" TCBs to be
available for DB2 calls.
-jc-
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