Use docker-ls:

PS D:\Cache\distr> .\docker-ls tags --registry https://containers.intersystems.com intersystems/iris-community
requesting list . done
repository: intersystems/iris-community
tags:
- 2020.1.1.408.0
- 2020.3.0.221.0
- 2020.4.0.547.0
- 2021.1.0.215.0

Feel free to create a draft here and send the link to @Evgeny Shvarov.
 

Thank you for the info Guillaume!

I would like to clarify that I'm not an author of Community R Gateway (although I do publish it).

Shiao-Bin Soong is the author of both Community R Gateway and R Gateway.

Thank you Benjamin!

But I see it does not mention R at all and there's no corresponding R method in $system.external:

set javaGate = $system.external.getJavaGateway()
set netGate = $system.external.getDotNetGateway()
set pyGate = $system.external.getPythonGateway()

Do you get Unable to connect or something else?

What's the output of iris list?

Please ask it as a separate question.

I would like to know if I can move only user database or default databases as well??

All databases can be moved

what sort of permission do I need to change for new directory path

irisusr should have RW access to the folder. The easiest way is to check what access (owner, group, permissions) is set for existing files/folders and then recreate the same in a new location.

and what all files I need to copy at new location??

IRIS.DAT and stream subfolder if it exist.

Please suggest if modification in iris.cpf file can do this all operation  

Absolutely.

It should but requires testing

%xsd.base64Binary is essentially a string so you can't write more than 3,5 mb there.

Change property definition to %Stream.GlobalCharacter instead.

Global buffers are one of the keys to performance.   

Yes, that's why if streams are to be stored in the db they should be stored in a separate db with distinct block size and separate global buffers.

Some time ago I was working on the issue of a fast data generation for an arbitrary data model.

Data model was connected (object properties) and so to generation was going in stages from low-cardinality independent tables (i.e. product) to high-cardinality dependent tables (i.e. orders). Furthermore tables did not have continuous IDs, there were gaps (due to sharding in my case but even if there's no hard delete we might want to exclude soft deleted rows).

Here's the approach I used.

1. For a given class build a local with all ranges of IDs:

/// d ##class().Ranges()
ClassMethod Ranges(class As %Dictionary.Classname, Output ranges)
{
    kill ranges    

    set table = ##class(%CSP.UI.Portal.SQL.Home).Quoter2(##class(%DeepSee.Utils).%GetSQLTableName(class))
    
    set rs = ##class(%SQL.Statement).%ExecDirect(,"SELECT ID FROM " _ table _ " ORDER BY ID ASC")

    do rs.%Next()
    set start = rs.ID
    set end = rs.ID
    while rs.%Next() {
        if rs.ID - 1 = end {
            d $i(end)
        } else {
            set ranges($i(ranges)) = $lb(start, end-start)
            set start = rs.ID
            set end = rs.ID
        }
    }
    
    set ranges($i(ranges)) = $lb(start, end-start)
}

This method accepts class name and returns this structure:

ranges(num) = $lb(startID, length)

2. Call GetRandomInRanges method to get random ID from ranges local:

/// d ##class().GetRandomInRanges()
ClassMethod GetRandomInRanges(ByRef ranges)
{
    set sum = 0
    
    for i=1:1:ranges {
        set sum = sum + $lg(ranges(i),2)
    }
    
    set threshold = $random(sum) + 1
    
    set sum = 0
    for chunk=1:1:ranges {
        set sum = sum + $lg(ranges(chunk),2)
        quit:sum>=threshold
    }    
    
    set val = ranges(chunk)
    if $listvalid(val) {
        if $ll(val)=2 {
            set val = $lg(val, 1) + $random($lg(val, 2))
        } else {
            set:$listvalid(val) val = $lg(val, ($random($ll(val))+1))
        }
    }
    
    quit val
}

This method guarantees that returned IDs would conform to the normal distribution.

Ranges should be called once and GetRandomInRanges  can be called as often as needed.