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#Caché

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

Documentation.

Article
· Nov 8, 2016 4m read
Returning Disk Space to File Systems

This is the first article in a series discussing how to regain disk space from Caché databases at the operating system level. This introductory article discusses Caché database growth and gives an overview of various methods you can use to return unused disk space that is allocated to database files back to the file system. But before we talk about returning space to the file system, let’s first review how does it get allocated in the first place.

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Hi,

I am using the &sql () tag to retrieve the value from the Cache DB.

below is the piece of code i am using:

script language="cache" method="retrieveDetail" arguments="pVariable" returntype="%String"
&sql( select columnA,
into :tempVariable1
from TABLE
where COLUMNC = pVariable

quit tempVariable1

i have to return the ColumnA value back to the calling procedure.

can i know how it can be done ? since i am getting an javascript error.

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Article
· Nov 8, 2016 4m read
Introduction to Outlier Selectivity

Beginning in Caché 2013.1, InterSystems introduced Outlier Selectivity to improve query plan selection involving fields with one atypical value.

In this article, I hope to use an example 'Projects' table to demonstrate what Outlier Selectivity is, how it helps SQL performance and a few considerations for writing queries.

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Question
· Nov 7, 2016
Monospace output from Zen

Hi,

I have a problem which i think has a simple solution but which i and others haven't yet cracked. I want to display text output to a text box in monospaced font. At the moment the style sheet is shown below, I have tried various other options such as specifying a specific font such as Courier New. None of the browsers I have tried (Safari, Firefox on OSX, IE) display as monospace, although the last 2 come close. I wonder whether I need a <pre> tag, but I can't see how to do that in Zen.

Suggestions?

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Whether you are accessing DeepSee for the first time ever or you are configuring DeepSee on a new instance, there are two common issues that are encountered after clicking on the “DeepSee” option in the System Management Portal.

Issue #1: Architect/Analyzer is grayed out!

Issue #2: DeepSee must be enabled before use.

Issue #1: Architect/Analyzer is grayed out!

There are two common causes for this problem.

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Here's an easy one for you; before I spend another hour looking for the answer, how do you convert %ArrayOfDataTypes to an array (that could, say, fit into the %session.Data array, or maybe just some array named info()), and of course back again?

NS>s aodt=##class(%ArrayOfDataTypes).%New()

NS>w aodt.SetAt("lcavanaugh","username")
1
NS>w aodt.SetAt("organization","coolcompany")
1
NS>w ##class(%ArrayOfDataTypes).BuildValueArray(aodt,.array)

<LIST>zBuildValueArray+1^%Library.ArrayOfDataTypes.1

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Article
· Jun 21, 2016 1m read
Simple Cache systemd Unit

Hello

I have noticed that Cache (2016.1 at the time of writing) doesn't come with a systemd startup script for RHEL7.

Here is a small example script I have built.

[Unit]
Description=Intersystems Cache

[Service]
Type=forking
ExecStart=/bin/bash -c '/usr/cachesys/cstart 2>&1 | logger -t cache_start'
ExecStop=/bin/bash -c '/usr/cachesys/cstop quietly 2>&1 | logger -t cache_stop'
RemainAfterExit=yes

[Install]
WantedBy=multi-user.target

The file should be placed as /usr/lib/systemd/system/cache.service

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Question
· Nov 4, 2016
MakeDirectory

Hi All,
when I ran the Command to make a folder in particular directory its not working in terminal,but when i run the same command in studio output block it create the folder.
Used command:
S cmd="mkdir E:\DIRECTORY"
O cmd:"QR":10
Suggest Please.

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Hi-

I have created a class that extends %Persistent and %Populate and have set the various POPSPEC attributes of my properties to control how the properties are populated. However, when I compile the class and try to run the Populate() method it tells me the method isnt defined.

Here is the class definition:

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Question
· Nov 1, 2016
File size.

Hi everybody,

My name is Sérgio Fernandes and I'm from Brazil.

I need to get the size of file that the user wants to upload in my application.

I'm getting it name with %request.GetMineData("fileName").FileName, but not found it at Ensemble documentation how would i get the size of file.

My version is Ensemble 2013.1.6.950.0 and I'm doing it at csp.

Thaks

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I try to run the cmd command in the studio terminal, but i am getting the <NOTOPEN> Error.

Even ZF(-1) also not working. Any help, Please!!!

Note: i restart the Cache instance service with full privilege

Code:

Set Path="mkdir E:\Sample\New"

Open Path:"QR":10

Error:<NOTOPEN>

This command working on my PC, but on server throws error.

Many Thanks

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Question
· Nov 3, 2016
Simple Arithmetics

Can somebody explain this behaviour of Cache (and many other calculating machine as well) :

WRITE 1/3*12

4

WRITE 1/3*5

1.666666666666666667

W 1/3*18

5.999999999999999999

W 1/3*21

6.999999999999999999

W 1/3*24

7.999999999999999999

How can we make more occurate caculations in Cache ?

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A group of students at the Chalmers University of Technology (Gothenburg, Sweden) tried different approaches to automatically rating the quality of emergency calls, including iKnow.

Excerpt: "The most impressive results produced by iKnow is its ability to correctly classify 100% of the calls using the Average algorithm. This is quite surprising since iKnow only compares low-level concepts, how words relates to each other."

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Question
· Oct 31, 2016
Zen Excel Report

Hello Everyone.

Sorry if it is a dumb question, but I'm new.

First: I have to create a Excel MultipleSheet Report. That I'm fine with doing.. but they want me to give every Workbook that is created it's unique reportName, that is generated with the user input on the page. Is it possible to do so?

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I am using OAuth2 Cache framework, acting as a client to an authorization server. My setup is based on this excellent previous post [Caché Open Authorization Framework (OAuth 2.0) implementation – part 1].

I'm facing ‘Authorization Server Error: Error Processing Response - No match between server name 'googleapis.com' and SSL certificate values google.com…’

It looks like I should set SSLCheckServerIdentity to false but I can’t figure out how. Has anyone had the same issue?

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This post is meant to provide a quick possible explanation for a very perplexing problem.

Scenario: You’ve just created your own administrative user in your 2014.1 (or later) instance of Caché. You gave it every possible security role (including %All), so it should in theory be able to do anything within the instance.

You’ve written a very advanced routine with a break command in it for debugging:

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I have a client who is in the process of developing some tests (short routine) to perform on a large data set – possibly several hundred million records – and is looking for an efficient way to spread the workload across his CPU’s to speed up the execution time. Any suggestions or tips I can pass on?​

Absolutely investigate the Work Queue Manager:

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  1. Don’t use Python built into Mac. Because of System Integrity Protection (SIP) you will not be able to access the libraries that the InterSystems Python binding requires. The Python build into the MAC has baked in what libraries it can use.
  2. Install another Python. Don’t put this other ahead of Mac Python on path since this could break things. Apple regards its Python as part of the its OS, and may use that Python in its system operations.
  3. This Python will not be installed into the protected area.
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