InterSystems IRIS Document Database (DocDB) offers a flexible and dynamic approach to managing database data. DocDB embraces the power of JSON (JavaScript Object Notation), providing a schema-less environment for storing and retrieving data.

It is a powerful tool, enables developers to bypass a ton of boiler plate code in interaction with existing applications, serialization, pagination and integration. the seamless flow of DocDB with Interoperability Rest services and operations, gives a big leap in API production and management.

for full DocDB documentation Here. in the context of this article i will showcase a use case in which DocDB will make a perfect fit.

what is the big O of $lf, $lg, $li, $lts and list concatenation by "_"

let there be less <UNDEFINED> or <SUBSCRIPT> Errors in my life.

I Mean By Default without overriding the service class and manually logging.

Is there a way to ensure a certain global(s) are always in buffer ?!

Is there a method call to check if a global is in buffer ?

i noticed -by reading .INT files of one class- that some of embedded sql select statements code blocks translates into code that uses lock command.

even if i use %nolock in the select, still cursors and arrow referencing notations "->" have the same results.

in order to do analysis on huge data volumes, it is better to take you data to a separate machine for analysis away from the operational machine, so trying to write huge globals or tables into files as is would take a huge space, what could be a solution or best practice ?..in python for instance, there is the pickling option (serializes data to byte string and saves it to a file) to save space, what could be best in object script ?

I'm trying to connect to a database (outside Cache) using the examples here:

https://docs.intersystems.com/irislatest/csp/docbook/DocBook.UI.Page.cl…

and https://docs.intersystems.com/latest/csp/docbook/Doc.View.cls?KEY=BGOD_…

and i'm still getting an error on running the Connect method ( Connect(pDSN,usr,pwd,0))

"0 "_$lb($lb(6022,"DSN/User Connect",,,,,,,,$lb(,"TRAK",$lb("e^zConnect+15^%Library.SQLGatewayConnection.1^2","d^zConnect+13^%Library.SQLGatewayConnection.1^2","e^^^0"))))/* ERROR #6022: Gateway failed: DSN/User Connect.

for debugging purposes of complex applications.

Pyodbc supports calling stored procedure  , but if the IRIS Stored Procedure ROWSPEC has a column with datatype specified as %Date or %Time, Pyodbc fails to fetch it and throws this error.

"

pyodbc.Error: (' 2201', '[ 2201] [Cache ODBC][State :  22018 ][Native Code 22005]\r\nERROR #388: Unknown error, code 22005 (22005) (SQLGetData)')

"

on printing the cursor execute description, pyodbc reads the column as <int>.

and if the ROWSPEC datatype specification was removed, it fetches successfully.

i'm using the driver "InterSystems IRIS ODBC35"  2019.2.0.107

I'm looking into finding ways to  fetch data from cache efficiently and work with it with python - specially pandas.

i tried the following but i'm wondering if this is the most efficient way?

to run the stored procedure as %ResultSet inside cache in a classmethod and serialize the data to JSON

and then call that class method from python

 Class User.RegObj Extends %RegisteredObject
{ ClassMethod runAlpha() As %Library.DynamicAbstractObject
{
set QHi=##class(%DynamicAbstractObject).%FromJSON("{}") set rs=##class(%ResultSet).%New("User.Person:alpha")
set pr=rs.Execute("","") set idx=0 
while rs.