Setting the TZ Environment Variable on Linux

The Update Checklist for v2015.1 recommends setting the TZ environment variable on Linux platforms and points to the manpage for tzset. This is recommended to improve the performance of Cache’s time-related functions. You can find out more about this here:

https://community.intersystems.com/post/linux-tz-environment-variable-not-being-set-and-impact-caché

The manpage on my CentOS 7 test system (RHEL 6 says the same) has this to say:

“The tzset() function initializes the tzname variable from the TZ  environment  variable.

Hello,

I am still a beginner with COS and am struggling with these concepts. While digging through the official documentation will eventually tell you everything you need to know, getting started is nevertheless not an easy feat...

Is it possible to create a "lists/array/multidimensional 101" page for beginners?

I am hoping some of you network guys have ideas. InterSystems seems to be at a standstill. When I startup Studio and try to start Terminal I get License Limit Exceeded. Starting with Terminal and going to Studio, same thing. It started when I put down a 2016 version of Cache on top of a 2015. InterSystems told me to uninstall everything and start fresh. I did that but have the same problems. What can I look at? How do I start to debug this? Although I am the only one on my PC it is really impacting my performance.

-thank you

Updated  DEV server from account 2013.x to  2015.2 (Build 664_3U) of Ensemble 
 

Platform : UNIX (Red Hat Enterprise Linux for x86-64)

When trying to start the JDBC gateway server got the following message
*****************************************************************************
Type: Error
Text:   Execution returned: Exception in thread "main" java.lang.UnsupportedClassVersionError: com/intersys/gateway/JavaGateway : Unsupported major.minor version 51.0
at java.lang.ClassLoader.defineClass1(Native Method)
at java.

Hi All,

I've created a sample implementation of the MQTT protocol, which is now available on GitHub. 

The project demonstrates MQTT client capabilities and it's written in Caché Object Script.

Any comments, bug reports are welcome! Some more enhancements (like SSL / TLS support) are planned for the near future.

Introduction

The field test of Caché 2016.2 has been available for quite some time and I would like to focus on one of the substantial features that is new in this version: the document data model. This model is a natural addition to the multiple ways we support for handling data including Objects, Tables and Multidimensional arrays. It makes the platform more flexible and suitable for even more use cases.

Hello!
Are there any short ways of serializing COS entity to the string? I am searching for something like .$toJSON() , but I need Caché 2013.* support.

The one way I supposed to work is to use $listbuild:

set str = $LISTTOSTRING($LB(1,2,3,",",5))
set list = $LISTFROMSTRING(str,",")
zw list
list=$lb("1","2","3","","","5")

But the problem is that $listbuild does not escape delimiters, and it is not possible to deserialize serialized string. The structure I need to serialize may contain any characters.

Are there any short ways to do this in Caché to avoid writing custom parser?

Hi!

Here is small "How to" again.

Suppose you need to share something with source code. How can we manage it on DC?

Sharing code snippets

1. Add normal post (not Code Package).

2. Paste your code in the post and format it with highlighting as it is described here.

3. If you see that your COS code is highlighted wrong it means that autodetect missed with language. Open the post's HTML ("disable rich-text" button below the Editor) and put class=COS parameter into the code tag.

Example:

#dim test as %Library.Integer 
SET test = 123.099 
set ^global = %request.

Order is a necessity for everyone, but not everyone understands it in the same way (Fausto Cercignani)

Disclaimer: This article uses Russian language and Cyrillic alphabet as examples, but is relevant for anyone who uses Caché in a non-English locale. Please note that this article refers mostly to NLS collations, which are different than SQL collations. SQL collations (such as SQLUPPER, SQLSTRING, EXACT which means no collation, TRUNCATE, etc.) are actual functions that are explicitly applied to some values, and whose results are sometimes explicitly stored in the global subscripts. When stored in subscripts, these values would naturally follow the NLS collation in effect (“SQL and NLS Collations”).

I've been in IT since 1986.

I started with Pr1me INFORMATION and Primos on Pr1me hardware.

In the 90s and 00s, I used D3.

I'm giving Caché a try, but I'm kinda having some difficulty getting started.

I've installed Caché on a 64-bit Windows 7 workstation. It was installed under an administrator's account. From a standard users account, I'm trying to access the Management Portal at:

http://localhost:57772/csp/sys/UtilHome.csp

It is prompting me for credentials. Which ones do I use? I've tried several, but nothing is working.

Problem: Caché instance connects periodically to an Oracle database via jdbc and downloads data. Sometimes data on a remote server would change.

Hello, is there a way to reset all of the Sample Classes back to their "Installed State."? In other words, delete all the other classes I have put into the samples namespace and leave only those classes that were there when I installed the instance.?

-thank you

Mirroring provides an admin capability to Stop Mirroring on this member, which causes a non-primary member to temporarily disconnect from the primary, stop dejournaling, etc.  While most system administrators may never need or use this function, some employ it for certain kinds of maintenance or other special cases.

The intent is that the administrator uses the Start Mirroring function when they wish the member to reconnect. However, today mirroring also implicitly restarts (reconnects) if the Caché instance restarts.

Hello!

I have a WebSocket application which spawns new process using JOB command.

Sometimes WebSocket connection can be terminated, and in the meantime I need to hold spawned process alive until it can be associated with the new WebSocket connection. (Do not suggest serializing process state here instead please)

Technically, in Caché WebSocket connection is represented by the class, which executes in its own process. This process is terminated when the connection is lost. In this case the JOBbed process does not terminates (thanks Edward), but it rely on $ZPARENT variable.

Hi, Community!

Last weekend we held the Final of InterSystems Contest on Caché, DeepSee and iKnow under the aegis of IT Planet Student Championship in Ekaterinburg. BTW, this year we had more than 1,400 participants in InterSystems Contest.

One of the tasks for the final was to solve T9 Spelling problem  with Caché ObjectScript and use the minimum code. 

Problem description:
The Latin alphabet contains 26 characters and telephones only have ten digits on the keypad. We would like to make it easier to write a message to your friend using a sequence of keypresses to indicate the desired characters.

I am pleased to announce the field test of Caché and Ensemble 2016.3 -  with many new improvements.

The product team at InterSystems looks forward to your participation in the field test and feedback over the coming months.

Some of the more signification changes in 2016.3 are new RESTful APIs for iKnow and broader APIs for programmatic control of multiple servers (enterprise manager).  As always, there are a host of scalability and performance improvements, including improvements to the core database and SQL.  And hundreds of smaller improvements and corrections.

Hello

During some consultant activity I did at a client's I have discovered something very interesting. It seems like the current processing cycle as written in ObjectScript has trouble utilizing an SSD-based storage machine with five-digit IOPS.

Recently I was asked by a customer with this question. In MS SQL Server, there is a function called host_name() that will return the work station name.

Here is how I would do it in Caché :

With default SQL schema name, in my case SQLUser in SQL (which is equivalent as User in Caché class definition), I have a class called User.dummy, I added a classmethod called hostname and expose it as SQL function host_name:

/// 
Class User.Dummy Extends %Persistent [ ClassType = persistent, DdlAllowed, ProcedureBlock, SqlRowIdPrivate, SqlTableName = dummy, StorageStrategy = "" ]
{
Property f1 As %Library.

I have a ZEN page with buttons, text boxes and a tab group. The tab group contains a single tab which I use to display an image(src). When the user, uses the browser zoom capabilities to reduce or enlarge the image, the other controls are reduced or enlarged as well. How can I reduce or enlarge the tab src alone? Thank you for any and all input.

NewBie's Corner Session 6 If and Kill commands

Welcome to NewBie's Corner, a weekly or biweekly post covering basic Caché Material.

Click on the Caché Cube in your system tray and select Terminal to try out the commands.

As in other computer programming languages, the If command is the primary decision makes.

If command with numeric operands

Set X=12

If X=12 Set X=13

Write X

13

If command with alphanumeric operands

Set X="ABC"

If X="ABC" Set X="XYZ"

Write X

XYZ

Whenever alphanumeric data is being referenced, quotation marks are required.

I have a homeTemplate and ExamesTemplate page. When I'm in ExamesTemplate and make a resfresh (F5 browser), the page back to the HomeTemplate. I need the page ExamesTemplate not return HomeTemplate.

I'm using ZenMojo with Bootstrap

Can someone help me?

Thanks.

Hi,

I am working on a DataGrid based upon ZenTest.Datagrid.cls

I want to save data after changes on a row.

The existing samples do not explain how to save changes on data in a grid.

I have tried something like zen(‘json’).save

Does anybody has some sample code?

I have a production system that has a large dataset of about 2 million rows. I need to create an index on a property but don't want it available to queries until the index is fully populated. Is there a way I can create the indexed, fire off the build, then "activate" the index so queries can use it.

The problem I face is the minute I create the index queries start returning zero rows because it starts using the index. As I start building it starts returning qualifying rows for those it has indexed but misses those not yet processed.

Hi,

Assume an architecture where an ECP Database Server is connected to by one or more ECP Application Servers inside a firewall.The application server hosts the web application that web users connect to.

The Web servers are outside the firewall, and, (using the CSP gateway/server mechanism) issue requests over the SuperServer port and into the application server.

I know that the traffic between the Web Server and the ECP application server can be encrypted using HTTPS, and access to the CSPServer on the Application server is username/password secured.

Hi community!

Does anyone know if it´s possible to override a property name to generate a JSON message based on the instance of object?

Thanks,

José Sampaio

Hello,

I am not certain where to post this, but I am seeking to hire consultants with Intersystems Caché DBA experience.  Is there a source for qualified professionals?

Thank you!

Brian

Hello friends,

Does anyone know how to make the default checked for the 'Open as read-only' setting in Caché Studio version 5.0?

Find out about the various ways you can learn Caché.