#Databases

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InterSystems Caché database is a file where all the data, application scripts, and users, roles and security configurations are stored. Typically the name of the file is cache.dat.

Documentation.

I am relatively new to Intersystems cache database management. As I understand it, a database is set with a maximum size or unlimited and the size of each space allocation for the database is defined. My understanding is that the cache database will then manage the allotment of space to the database as the current space allocation is consumed. Though I do not know why one would want to do this, I have been told that the space allocation to a database can be set to be handled manually. This is something, if true, I was not aware of.

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I have a workstation with a CACHE instance up and running.

On that same workstation there is also an instance of IRIS (fresh install). I would like to migrate manually the CACHE database to IRIS (ideally, all globals, routines and classes).

What I tried is to copy C:\InterSystems\Cache\mgr\CACHE.DAT to C:\InterSystems\IRIS\mgr\IRIS.DAT (after shutting down both instances) but it does not work.

I got the following message : (112) The service for the IRIS instance did not start.

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Hi Community,

Join the upcoming InterSystems Interoperability Contest Kick-off Webinar dedicated to the Interoperability Contest.

In this webinar, you'll get an overview of the interoperability capabilities of InterSystems IRIS, and we'll show you how to use the PEX. Also, we’ll discuss and answer your questions on how to build interoperability solutions using InterSystems IRIS and IRIS for Health.

Date & Time: Monday, October 4 — 12:00 AM EDT

Speakers:
🗣 @Stefan Wittmann, InterSystems Product Manager
🗣 @Bob Kuszewski, InterSystems Product Manager
🗣 @Evgeny Shvarov, InterSystems Developer Ecosystem Manager

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I would like to know if an encrypted caché database can run significantly slower than a normal "unencrypted" database, in a way that is noticeable to the end user (e.g. slower response time for most pages, especially the ones that rely on read/writing to globals).

I searched in Intersystems knowledge base and couldn't find anything related. I'm looking for possible before/after benchmarks.

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How to find a global's original namespace ? Potentially mapped from a different namespace .

I have a global ^Custom that exists in multiple namespaces but it could mapped from namespace Drone(A) to Launch(B)

Without access to Cache management portal how to find where is my global located using cache code ?

Like if ^Custom == ^[Drone]Custom ??

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Hello gentlemen,

I hope you can help me because this is a very serious that I can't wait to resolve... Our back-up is currently taking 3 up to 4 Gb per day and we don't know why. We had 270 Gb yesterday and we are today at 274.3 Gb. We keep a computer history of the messages for only 50 days. Here is a picture of what's currently taking the most data place in our healtshare system:

(don't forget that our DB is also connected to the back-up, maybe it is related, I don't know)

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In a typical database, changing the type of a column from some kind of date/time to a string would require a degree of migration effort for existing values. In Caché, my suspicion is that this is not the case, and I could simply change a property definition from %Timestamp to %String (MAXLEN = "30") and recompile, without needing to worry about damaging the existing data stored for this property. Is this correct? Or would I find the existing data in this property being lost or corrupted?

Thanks in anticipation

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Hi,

I have a DR member and in this cache server the database "cachetemp" start to getting bigger without any reason (50GB that was all the free disk space we have)

In the members of the mirrors the cachetemp its ok and the size is 31MB.

I restarted the server because I read that the cachetemp database purge when restarting, but didnt happend.

Any recommendation to clean this database? can I just deleate the CACHE.DAT from this database?

Thanks!!!

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Hi everyone,

I am talking from Brazil and we have one very important customer that requested our support to find a consultant, deeply specialized in Cache that could work with us attending this customer. It has a tons of data and its core application is based on Cache.

If you are interested send me an email with the subject title - Cache consultant opportunity - and we will make contact with you. The main request is how strong are your skills in cache and it would be considered a differentiator if you are a portuguese speaker.

Regards - Helberth Cavalcante.

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Hello,

We have a need to track Database changes over time - down to the SQL level of granularity if possible. Such as: User xyz runs routine ^abc and we get something similar to a changelog that tells us: table A had this value updated, insert, update etc....

Is that possible using IRIS level tools (Audit Log, Journal File, etc...) , is there a way to convert the global sets and kills from the journals into SQL level changes?

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At the heart of IRIS and Cache is a very interesting database architecture that we, at M/Gateway Developments, refer to as "Global Storage". If you ever wanted to know more about the fundamentals and capabilities of this underlying database, you might want to read a major analysis we've put together:

https://github.com/robtweed/global_storage

Amongst other things you'll discover that:

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Article
· May 11, 2021 8m read
IRIS in Astronomy

In this article we are going to show the results of the comparision between IRIS and Postgress when handling Astronomy data.

Introduction

Since the earliest days of human civilization we have been fascinated by the sky at night. There are so many stars! Everybody has dreamed about them and fantasized about life in other planets.

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