Alexey,
with $ZF(-1,command) you are at OS level.
Nothing prevents you from extending command to a script that writes its pid in a file.
using $JOB_".pid" or similar as file name should be enough to identify it.
So after a moderate HANG your pid should be available.
I prefer this to using pipes or other sophisticated solutions (e.g. listening on a TCP/IP or UDP port, ...)
as you get an embedded trace for free
HTH
online docs don't give a direct hint.
so my shot from the hip:
selection expression - $select(), $case() where you get a value based on a condition
data expression - anything that sets, modifies, composes data.
this is a quite academic view since data expressions may contain selection expressions
and selection expressions may contain data expressions.
both variants and any mix of it are quite common in COS
HTH
Sorry, what's the context? SQL ? COS ?
Are there also english Versions of those videos ?
My Spanish is rather rusted and more oriented towards holidays.
I did a short test fiddling arouned ^Samples.PersonI
This looks good so far.
Similar using Class %System.License. ... you may reduce the number of allowed connections by USER
This might be interesting in SaaS situation.
classmethod SetUserLimit(MaxLU As %Integer) as %Integer
$SYSTEM.License.SetUserLimit establishes the maximum number of license units that this Cache instance will consume. This permits a system manager to prevent a Cache instance from consuming all the license units in a MultiServer key shared among multiple Cache instances. The Method returns the former maximum value. In the absence of a call to $SYSTEM.License.SetUserLimit(max) a Cache instance may consume all available license units.
Requires access to the %Admin Manage resource.
Using Class %System.License. ... you may reduce the number of allowed connections by instance
• classmethod SetConnectionLimit(MaxCon As %Integer) as %Integer
$SYSTEM.License.SetConnectionLimit establishes the maximum number of connections permitted per user on this instance. This enables a system administrator to prevent a user from making so many connections to a Cache instance that they consume all available license units. Calling $SYSTEM.License.SetConnectionLimit($SYSTEM.License.MaxConnections()) permits a user to make the maximum connections permitted but prevent transitioning to the license unit per connection state, insuring the user will consume no more than one license unit. A zero argument removes the limit. The failure to obtain a license will be indicated in the normal way. For example, a call to $system.License.Login() will return zero (0) while a failure to log in to a new terminal connection will receive a error. However, these license failures will not be reported in the console log. The method returns the former maximum value.
The limit applies only to the local instance. If a Cache MultiServer license is shared among several instances it is still possible to exceed $SYSTEM.License.MaxConnections() over all instances. This can be avoided by setting the limit low enough on each instance that the combined connections to all instances will be unlikely to exceed $SYSTEM.License.MaxConnections().
$SYSTEM.License.SetConnectionLimit reqires access to the %Admin Manage resource. It is suggested that customers call this API from SYSTEM^%ZSTART.
high comfort service ! 
ClassReference of %Library.Persistent shows it as sub classes
http://docs.intersystems.com/latest/csp/documatic/%25CSP.Documatic.cls?…
Tom.
In a similar situation I changed only one of the Serial classes to %RegisteredObject.
Compilation was fine:
Next I changed it back to %SerialObject.
Complation was fine again. And remained fine.
excellent help
very useful
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