From: Christian Holm Christensen (cholm@hehi03.nbi.dk)
Date: Fri Nov 22 2002 - 10:26:48 EST
Hi Flemming et al, "Flemming Videbaek" <videbaek@sgs1.hirg.bnl.gov> [Fri, 22 Nov 2002 09:26:03 -0500] wrote concerning lullaby ---------------------------------------------------------------------- > Hi Christian > > The machine is on my desk, and actually in the pii cluster, > But don't dare to use it !! I wasn't considering that, I was merely wondering what this new machine was :-) > On the detector params > - yes I think SOME of the data should go into a DB; but many of > them will never change and then it may not be so bad to keep them in > ascii files - afterall we have many tasks on the plate , and it may > not be the highest priority to design the ideal system. I will take > a look at this. Whether a given parameter changes or not is not really the conditional for whether it should be stored in a database or not. I'd say that the decision criteria is: If a parameter is used by multiple jobs, people, steps, ladida, over and over again independent of simple `job-parameters', it _must_ be stored in a database. It is clear that the parameters that do not change (or change rarely) should not be written to the databases often - in fact, they should only be written when they change. Fortunately the design of the DB's facilitates just that. Also, I'd argue that such things as ADC-channel-number to row/ring-number (like in the SMA/TMA/BB(?)), ADC-channel-number to pad-row/column, active channel, and similar maps, all belong in the geometry database, as it's conditional on the physical (as in some thing palpable) setup, not the `cyperspace' of the DAQ. Whether we should `... design the ideal system' is a non-issue. The point is we should have a system that is fault tolerant and insures data integrity. A database is just that - ASCII files are not, period. And, we don't really need to design anything new - we can exploit the already existing system. I know the design calibration database is flexible and stable enough to handle what is in the `DetectorParameters.txt', and that may also be the case for the other database desgins in BRAHMS - I don't know - I haven't looked at them in that detail. Yours, ___ | Christian Holm Christensen |_| | ------------------------------------------------------------- | | Address: Sankt Hansgade 23, 1. th. Phone: (+45) 35 35 96 91 _| DK-2200 Copenhagen N Cell: (+45) 24 61 85 91 _| Denmark Office: (+45) 353 25 305 ____| Email: cholm@nbi.dk Web: www.nbi.dk/~cholm | |
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