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I did some experiments on my local machine and found out that IRIS seems to associate each request (eg: CSP request) to a dedicated process named IrisDB.exe

This process has 3 threads, and one of them seems to be the main working thread (that will the handle request).

If I spawn many concurrent requests, the number of IrisDB processes on my local machine will grow (to make sure each request can be handled in parallel).

It seems there is a limit : it will create no more than 64 processes to handle requests (eg: even if 100 concurrent requests are send to IRIS).

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Out of curiosity, I was looking in ^ROUTINE global to see how routines are stored internally.

I found out that lot of nodes are displaying "~pointer" as associated value (eg: instead of a string).

What are those pointers ? My guess is that it references some cache internal structure (eg: some nodes inside a B-Tree).

Is there a easily way to see what is behind ? Are pointers useful for user globals or is this something purely internal to Cache database ?

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I got an error that occurs inside %CSP.Broker. That class is located inside %SYS namespace.

I tried lot of things (including checking system logs) but ultimately what would really help would be to be able to modify that class to add my own logs into it.

If I try to modify it, I got this error message:

Item '%CSP.Broker' is mapped from a database that you do no have write permissions on.

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We recently migrated to IRIS. Before, the CACHE.EXE executable could be invoked from a batch file directly :

C:\InterSystems\Cache\bin\cache.exe -s C:\InterSystems\Cache\mgr -U %SYS

This will display the following in console :

Node: DESKTOP-8H4B321, Instance: CACHE

USER>

Additionally, the pipe instruction can be used to redirect some commands directly

echo write 50 | C:\InterSystems\Cache\bin\cache.exe -s C:\InterSystems\Cache\mgr -U %SYS

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I would like to create a toolbar button in Cache Studio. After clicking on it, it would run a custom command (eg: to execute a routine that will clean a global).

I took a look at dialog that is shown after right clicking on a toolbar in Studio, then choosing "Customize" but AFAIK there is nothing there that allow such a thing.

I know it's possible to customize menu items by extending %Studio.SourceControl.Base class, is there something similar for toolbars ?

Here is some base code example (based on Danny Wijnschenk answer) :

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I have a workstation with a CACHE instance up and running.

On that same workstation there is also an instance of IRIS (fresh install). I would like to migrate manually the CACHE database to IRIS (ideally, all globals, routines and classes).

What I tried is to copy C:\InterSystems\Cache\mgr\CACHE.DAT to C:\InterSystems\IRIS\mgr\IRIS.DAT (after shutting down both instances) but it does not work.

I got the following message : (112) The service for the IRIS instance did not start.

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I use the following code to start a start a job :

Class MyClass Extends (...)
{
    ClassMethod Foo()
    {
       job $CLASSMETHOD("MyClass","MyMethod") //take forever depending hardware
    }

    ClassMethod MyMethod()
    {
       //do database related stuff
    }
}

On local environment, calling Foo() is instantaneous (a few ms). On production/test servers (which have much better hardware than local) calling this function is slow and take between 200 ms to 800 ms. Obviously starting a new job with "job" command take lot of time on those environments.

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I would like to know if an encrypted caché database can run significantly slower than a normal "unencrypted" database, in a way that is noticeable to the end user (e.g. slower response time for most pages, especially the ones that rely on read/writing to globals).

I searched in Intersystems knowledge base and couldn't find anything related. I'm looking for possible before/after benchmarks.

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I have a CSP page that throw a "414 error - Request-URI Too Long" when I put lot of text (eg : 10000 characters) into a field of a submitted form. The form is submitted using POST method.

Based on some experiments I made, it seems the max size of a URL is around 8200 characters.

What is the official limit, and is there a way to increase it ? I searched in the documentation but couldn't find anything.

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I have some code in a mac routine that use indentation and the "." character : 

 IF condition1 DO
     .WRITE YCR,...
     .WRITE YCR,...
     .WRITE YCR,...

I would like to add a try / catch block between the write statements.
I can't refactor the whole code and use indentation with curly braces instead (there is too much code, not written by me)

I have tried the following but it does not work (it compiles, but code stop running right before the try keyword)

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