Astronomers’ tools

5 years ago, on December 19, 2013, the ESA launched an orbital telescope called Gaia. Learn more about the Gaia mission on the official website of the European Space Agency or in the article by Vitaly Egorov (Billion pixels for a billion stars).

However, few people know what technology the agency chose for storing and processing the data collected by Gaia. Two years before the launch, in 2011, the developers were considering a number of candidates (see “Astrostatistics and Data Mining” by Luis Manuel Sarro, Laurent Eyer, William O’Mullane, Joris De Ridder, pp. 111-112):

• IBM DB2,
• PostgreSQL,
• Apache Hadoop,
• Apache Cassandra and
• InterSystems Caché (to be more precise, the Caché eXTreme Event Persistence technology).

Comparing the technologies side-by-side produced the following results (source):

The first four will probably sound familiar even to schoolchildren. But what is Caché XEP?

The following post outlines an architectural design of intermediate complexity for DeepSee. As in the previous example, this implementation includes separate databases for storing the DeepSee cache, DeepSee implementation and settings. This post introduces two new databases: the first to store the globals needed for synchronization, the second to store fact tables and indices.

Let's say you have about 100TB of data in multiple CACHE.DAT. The biggest one is about 30TB but mostly more than 1TB. You have limited time for maintenance during a day, and it is only a few hours at night.

Hi

Totally new to IRIS and Cache.

Trying to evaluate it and work out how we could use it.

As a standard application database. Object or relational etc. does not matter. 

Method1(){

Hello everyone,

We have started to see Journal Daemon inactive and DBLatency warnings in the Console log of our Healthshare server. OS is Windows Server 2008 running in a VM. See below

I have already mentioned my project CacheBlocksExplorer recently in two articles

Hi -

I need an example of what I need to "map" to have a common dashboard defined so it will visible/usable in multiple namespaces.

Hello,

I would like to schedule the Database Compact and Freespace methods as legacy tasks.

Has anyone implemented this yet?
Is this even possible? 

Hello everyone,

Hi!

Suppose I have full access to Caché database instance A and want to export consistent part of the data and import it into another Caché instance B. Classes are equal.

I'm creating a new namespace by the installation manifest XML and in the "database" tag configuration I don't see attribute to configure if I what jounal globals or not to this database.

I have several stored procedures that when I execute them they will only return a single snapshot.