 23 Apr 2026, Pavel Murat, Bug Report, increasing the max number of hot links in ODB
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Dear MIDAS experts,
when I attempted to increase the max number of hotlinks in ODB , defined as
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 25 Apr 2026, Pavel Murat, Bug Report, increasing the max number of hot links in ODB
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I see - thank you for the explanation!
Indeed, updating MIDAS clients on each and every RPI etc in a running experiment may be a real challenge.
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27 Apr 2026, Pavel Murat, Bug Report, increasing the max number of hot links in ODB
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> I wonder why one needs more than 256 hotlinks at all. Please note that with the odbxx "watch" API, you can hotline a whole subdirectory, and get notified
if ANY of the
> underlying values or subdirectories change. In principle, one could have one hotlink to "/" and see all changes in the ODB (although that does not make |
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27 Apr 2026, Pavel Murat, Bug Report, increasing the max number of hot links in ODB
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> > I wonder why one needs more than 256 hotlinks at all.
>
> I confirm that ALPHA is running with MAX_OPEN_RECORDS changed from 256 to 2048,
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27 Apr 2026, Pavel Murat, Bug Report, increasing the max number of hot links in ODB
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> > Indeed, updating MIDAS clients on each and every RPI etc in a running experiment may be a real challenge.
>
> actually, only local clients must be rebuilt, remote clients connecting to the mserver do not care about ODB
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09 Dec 2003, Paul Knowles, , db_close_record non-local/non-return
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Hi All,
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18 Dec 2003, Paul Knowles, , Poll about default indent style
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Hi Stefan,
> once and forever, I am considering using the "indent" program which comes
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07 Aug 2019, Paolo Baesso, Bug Report, ROOTANA bug?
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Hi,
I posted on the ROOTANA elog but there seems to be little activity there...
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21 May 2024, Nikolay, Bug Report, experiment from midas/examples 
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There are 2 bugs in midas/examples/experiment:
1) In fronted bank named "PRDC" is created for scaler event. But in analyzer
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02 May 2023, Niklaus Berger, Forum, Problem with running midas odbxx frontends on a remote machine using the -h option
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Thanks for all the helpful hints. When finally managing to evade all timeouts and attach the debugger in just the right moment, we find that we get a segfault
in mserver at L827:
case RPC_DB_COPY_XML:
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02 May 2023, Niklaus Berger, Forum, Problem with running midas odbxx frontends on a remote machine using the -h option
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And now we also fixed the client segfault, odb.cxx L8992 also needs to know about the header:
if (rpc_is_remote())
return rpc_call(RPC_DB_COPY_XML, hDB, hKey, buffer, buffer_size, header);
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26 Jul 2019, Nik Berger, Bug Report, History/Endianness
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Hi,
I have a bank of floats with slow control values that I store to the history and
ODB. When reading the history, both in the webbrowser and with mhist, the floats
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06 Oct 2019, Nik Berger, Bug Report, History data size mismatch
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Logging a list of variables to the history via links in the history ODB subtree,
we get messages as follows at every run start:
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10 Oct 2019, Nik Berger, Bug Report, History data size mismatch
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>I wonder why do you this via ODB links. The "standard" way of writing to the history should be to create events for an equipment and flag this equipment
as being written to the
>history. All variables under /Equipment/<name>/Variables then automatically go into the history and you don't have to worry about ODB links. Only variables |
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10 Jun 2025, Nik Berger, Bug Report, History variables with leading spaces
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By accident we had history variables with leading spaces. The history schema check then decides that this is a new variable (the leading space is not read
from the history file) and starts a new file. We found this because the run start became slow due to the many, many history files created. It would be
nice to just get an error if one has a malformed variable name like this.
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28 Aug 2019, Nick Hastings, Forum, History plot problems for frontend with multiple indicies
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Hello experts,
I have been writing a SC frontend for a powersupply. I have used the model
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28 Aug 2019, Nick Hastings, Forum, History plot problems for frontend with multiple indicies
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Hi Stefan,
thanks for you quick reply.
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29 Aug 2019, Nick Hastings, Forum, History plot problems for frontend with multiple indicies
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Hi LCP,
thanks for the suggestion and link. Unfortunatly I don't think this explains it. |
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29 Aug 2019, Nick Hastings, Forum, History plot problems for frontend with multiple indicies
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Hi Ben,
thanks for your reply. I can confirm that your suggested workaround does indeed |
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01 Sep 2019, Nick Hastings, Forum, History plot problems for frontend with multiple indicies
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Hi Ben,
thanks for your reply. I can confirm that your suggested workaround does indeed
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