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#Caché

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InterSystems Caché is a multi-model DBMS and application server. See more details here.

Documentation.

Hi,

I am new to Cache' MV but have extensive experience with other Pick flavors especially Unidata.

I need to determine the impact of adding several indexes to a large file with over 51,000,000 records.

On other systems, I could use FILE.STAT, ANALYZE.FILE and shell to the OS to determine how large the index file was.

None of those seem to be available in Cache' MV. Shelling to the OS just tells me the size of CACHE.DAT.

What is the best way to determine what the disk impact would be if I added an index (CREATE-INDEX) to a file?

TIA,

Steve

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Hello,

I have a DB server (ser-app-db) where cache is installed as server.

I have a Web server (ser-app-w) where cache is installed as web server and configured as CSP gateway.

I followed the configuration guide (https://docs.intersystems.com/latest/csp/docbook/DocBook.UI.Page.cls?KEY...) and ser-app-w perfectly display the CSP and CLS pages.

But that's not working for my REST service, for exemple with the REST sample:

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Good day,

I need to find out if it is possible somehow to receive actual linux TIMESTAMP for example with $NOW() or other functions.
I was trying to recalculate it with $NOW() function, but without success. I would like to simulate Redis TIME command in COS.

My tryings:

USER > set time = $NOW()

USER > w (($PIECE(time,",",1)*86399) + $PIECE(time,",",2))
5573319043.403186

But in Redis it is:

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Okay, so I ran into a rather odd bug. I have a remote test machine (tst-intersystems) running for which I accidently opened a lot of windows in my Studio (i.e. 500+). The result is that the studio runs out of memory and crashes. Now, every time I try to connect to this remote machine studio immediately attempts to open all windows effectively not allowing me to start studio anymore.

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Question
· Aug 10, 2017
LogicalToDisplay Method

Hi, I am trying to understand the transformational methods.

  • LogicalToDisplay()
  • LogicalToOdbc()
  • OdbcToLogical()
  • DisplayToDisplay()

I have created a small class with the only property of List as %List, see below.

Class LastName.Demo2 Extends %Persistent
{
Property List As %List;

}

Then I entered the following commands in the Terminal

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Question
· Aug 9, 2017
%Library.Char

The data type %Char or %Library.Char

The description says it is a fixed length character field.

How do I set the fixed length?

Or by just setting %Char to something, does that automatically define its length?

Are the parameters MINLEN, MAXLEN involved? Or are these the way I set the fixed length?

Any help with this?

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Article
· Aug 8, 2017 1m read
Outperforming PostgreSQL and MySQL

In a previous exercise, I was able to show the power of Caché.
A medium-designed set of interdependent tables with some GB of data.
URLs cross reference over some million pages resulting in ~3 billion records

Competition was between

  • Caché
  • PostgreSQL
  • MySQL

Criteria were Speed + Storage consumption
I composed a customized loader fed over a "raw" TCP connection
Mapping the "objects" into the final table by directly writing to Global Storage.,

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Article
· Aug 5, 2017 3m read
Winning in GIS competition

GIS stands for Geographic Information System.
and it's not a typical arena for Caché. But it's definitely an environment with high data volume.

You see 3 major areas

- Visual front end:
A mature area well covered by a bunch of commercial and open source products.
No need for Caché there.

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Question
· Aug 5, 2017
Problem with terminal font

I don't know what a problem with my cache cube terminal, but cyrillic text is not displayed correctly.

I have some terminal program with cyrillic menus, dialogs and other text and all those items are displayed wrong (unknown symbols like on the image).

How can I solve this problem?

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Hi community,

I have some constants hardcoded in my class as parameter values, and those constants are referenced in many places in my module. Now the need has arisen to provide different value for those parameters depending on some context. Is it possible to create some sort of accessor method for the parameter (like it is possible for properties), or do I need to perform a thorough refactoring?

Thanks.

Jiri

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Have very little XML experience and have been able to manually create output. Have a need to take data that I store in a M global (example: ^TML("HDATA", ) and out put it in CCDA XML format.

Are there any examples of M code using the XMLWriter to accomplish this?

Or can anyone provide some guidance

Any help would be greatly appreciated.

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Question
· Jul 27, 2017
Get STACK of another process

Hi,

How can I read the stack of another process?

I know about ^JOBEXAM, but I only know how to use through terminal, and I need to get a string, or at least do a method that returns me a string

For example:

I have process A and B

B monitors process A at each second.

B logs information about process A in a table

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Good day,

I would like to know how to detect in Caché ObjectScript if data saved in string is number and furthermore, if it's type is integer.

I maybe found a solution:

set value = "44.2d3"

try{
set status = $INUMBER(value,"")
if ('$FIND(+value,".")){
w "your variable: '"_value_"' is number and integer"
}else{
w "variable is number but no integer"
}
}catch(e){
w "variable is not number"
}

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