Hello everyone


I am new to cache. In an interview i was asked how to optimize a sql query.

I just said I will create index on conditions which are present in where clause. But as per interviewer I should check How query plan is getting executed. This will help in optimizing Sql queries. 

I want to know what will be the answer for how to optimize SQL query in cache. 

Thanks in advance!!

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Virat Sharma · Sep 5, 2021
Global Access command query

Hello everyone, 

I am new to cache. I want to know is there any direct command to know how to find maximum number of subscripts in global A through direct command.

I mean the answer is 9 but how to check it using a direct command on terminal.


Thanks in advance!!








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Hello Everyone

I am new to cache. I know there are 2 types of methods in cache. One is Instance method (Which can be call through object creation of particular class) and other is Class methods (which can be call through ##Class(MyPackage.Car).CarModels()). 

I want to know the difference when to create a instance method vs when to create a class methods.

Thanks in advance!!.

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Virat Sharma · Jul 31, 2021
Ensemble learning query

Hi All,

I am new beginner to cache/mumps language. I want to learn Ensemble code but I do not have any application access to Ensemble code.

Is there documentation apart from Intersystems Ensemble documentation that can help me to learn Ensemble. Any notes or documents will be very handful

Please assist!! Thanks in advance.

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Virat Sharma · Oct 18, 2020
XML string query


I am stuck with simple logic. I have a below string 

set a="<Name>ABC</Name><RollNo>45</RollNo><Name>XYZ</Name><RollNo>66</RollNo><Name>xyz</Name><RollNo>89</RollNo>"

I need logic to replace the values of roll no with "***". Is there any single command which can help in this scanerio.

I need to store this value in database after replace.


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Virat Sharma · Sep 10, 2019
%OpenId Query


I am new to cache programming language . I am facing below issue . please assist.


Question: One persistent class ID column is a combination of its properties (Roll No and Marks) [ Exact: RollNo||Marks]. When i am running the query from Management portal it is displaying data in the same format and data is there. But in the code if i am making below statement, i am getting null value.

Set ExistsID=##Class(User.School).%ExistsId(RollNo_"||"_Marks)

set ID=##Class(User.School).%OpenId(RollNo_"||"_Marks)

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Virat Sharma · Mar 9, 2019
%SYS.TasK Related query

Hi Community,

I have to make a daily task (Job) which will run (7 am to 7 pm) in a day at an interval of 3 hours. Timings are as (7:00 am, 10:00 am,13:00 pm,16:00 pm,19:00 pm). But at each time when task will run i have to set a variables as per below condition


1) If task run at 2019-03-19 07:00 am in morning

I  have to set two variables (start and end) whose value will become like this

(set starttime= 2019-03-09 07:00:00.00 and set endtime=2019-03-09 10:00:00.00)

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