Posts tagged ‘HowTos’

Tuning disk access in instantOLAP

Fast OLAP

instantOLAP uses an extremely fast internal database system to store its dimensions, stores, caches and other information on the harddisk. Though the performance is good enough for the very most situations, you can even boost it by changing some server settings, depending on your server memory, harddisk, operating system or Java version.

This small HowTo addresses the administrator of your system and shows how, and where, to change the settings if you need more performance for your dimensions and stores. Continue reading this article and boost your system.

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Turn OLAP data into Geo Charts

instantOLAP contains a flexible GEO chart engine which allows to present your OLAP data as colorful maps with custom texts, color codings, icons and other visualizations in multiple layers.

This (video) tutorial shows how to create GEO charts, starting with a simple background layer. Watch the video or continue reading to learn more about maps in instantOLAP.

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OLAP Cube, ROLAP, MOLAP, HOLAP: How to use Stores

The built in Offline Stores in instantOLAP allow to aggregate the classical cubes fully or partwise into light speed local data stores. With Offline Stores, you can realize all modern forms of OLAP storage: ROLAP (direct access to relational databases when querying data), MOLAP (fully aggregated cubes with high performance) or HOLAP (a hybrid mixture of both).

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Overlay charts

We’ve been asked how to realize an overlay chart and how to place multiple ranges inside a single chart, so this article will show, using a simple example, how to do this.

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JDBC drivers

Before you can connect a database server with instantOLAP or any other Java application, you need a to install a matching database driver. For Java systems, you will need a driver which implements the Java JDBC standard and almost all database vendors provide a JDBC driver for their product.

Because of copyright reasons, only a few drivers are included in the instantOLAP standard distribution (an open source driver for Sybase and Microsoft SQL-Server and a second driver for HSQLDB databases). For all other database servers, you can find the driver in the internet. This is a list of the common database servers and some internet addresses where to find the driver.

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Remote control your OLAP server

There is an almost unknown tool within every instantOLAP installation, the instantOLAP Console, which allows to remote-control your instantOLAP server and to start, stop or rebuild models, to rebuild single dimensions or cubes or to perform a number of other operations.

The tool is very useful whenever instantOLAP loads its data from a data-warehouse and you want to rebuild certain models, dimensions or cubes after the ETL tool rebuild the warehouse or added new data to it.

This article describes, how to use the tool from batch-files or other Java applications (most ETL tools can call native Java commands) and which operations are available.

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How to update instantOLAP in Apache Tomcat

tomcatOf course, you could just download the new installer of instantOLAP and install the application in the same path again. But this has a number of disadvantages: 1. The download of the complete installation is much larger, 2. all of your personal settings in the server or for the instantOLAP would get lost and 3. the demo reports and the access rights and some other repository elements will be re- or overwritten with its original state again.

Therefore, this article describes, how to update instantOLAP when using the Apache Tomcat application server with some easy steps. The Tomcat server is included in the standard distribution of instantOLAP.

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Release 2.5.3: Connect Excel and other ODBO / XML/A clients with instantOLAP

Today we released our next version of instantOLAP, including the first beta version our new ODBO / XML/A / MDX connector which opens the world of other OLAP clients to instantOLAP servers. With the new connector, you can query the instantOLAP server with Microsoft Excel or any other reporting client that supports the Microsoft ODBO standard or the webservice-based XML/A protocol.

excel1

The beta version of the connector will be available for free as a part of the following releases unless it reaches the production standard in version 2.6.

You can download the new release 2.5.3 from our download page. Beside the connector, it contains a small number of bug fixes and performance-improvements.

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instantOLAP tutorial – Lesson 1: Installation

Since many things have changed between the versions 2.2 and 2.5, we will upgrade and extend our tutorial and to post it here lesson by lesson. This is the first part and it contains the basics like how to install and start the server:

  • Downloading and installing instantOLAP
  • Starting and stopping the server
  • Connecting the server with the Workbench
  • Installing a license-code
  • Opening the Web-Frontend

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“Query too complex”?

Because instantOLAP is usable as “adhoc” ROLAP tool, there is a maximum complexity for reports and a maximum number of loadable cube cells. When using adhoc-cubes, the system has to determine where to load which data from and which data is needed to populate the result or to calculate formulas.

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