mondrian olap

Mondrian is an open-source project. An OLAP (Online Analytical Processing) engine written in Java. It implements queries using the MDX language and reads data from relational databases (RDBMS. The results are displayed in multiple dimensions through Java APIs. We all know that Online Analytical Processing (OLAP) needs to analyze a large amount of data in real tim

As mentioned above, Mondrian is the core engine of OLAP. It is responsible for computing and caching data from relational databases and responding to queries from the presentation layer using the ms mdx syntax. The specific manifestation is a jar, which is started with Tomcat. After reading the foodmart sample, you should do it yourself. The first step is to design the

distinct xxx or select xxx group by xxx, mondrian generally uses the select distinct method, which has nothing to optimize. In addition, a query is used to query the value of a metric after multiple dimensions are aggregated, generally, the sum and avg values of a column are calculated after multiple dimension group by. However, if some elements need to be filtered out before group, mondrian translates the

To learn about this powerful open-source OLAP tool, we will first learn from its own demo example program. Below we will provide several configuration methods for connecting to the database (ODBC data source, MySQL, Oracle) on the Windows platform.1. Introduction to Mondrian (reference to the official introduction ):Mondrian is an

Mondrian is an OLAP engine, unlike OLTP, where OLAP is a logical model built above a physical table, called a cube, which is built by specifying optional dimensions and measures, each dimension has a dimension table, and the dimension has hierarchical information. OLAP lookup is implemented in an MDX table, similar to

generally use SELECT DISTINCT, this is nothing to optimize the place, there is another query is to query the aggregation of multiple dimensions after the value of a measure, Generally, multiple dimensions group by calculates the sum, AVG equivalent of a column, but if some elements need to be filtered out before group by, Mondrian will translate the remaining statements into where xxx in (xxx1, xxx2,...) (through the execution of the log can be seen)

Project report system using open source Mondrian and Saiku as a tool to achieve, and now I have to be familiar with the OLAP this piece of things, the first thing to face is Mondrian this mountain, Listen to their previous developer said Mondrian inside there will be a lot of pits, especially performance problems, in t

now for some data analysis (OLAP)-related data, just Mondrian provides a footmart data set for testing, which mainly records a number of fact tables and dimension tables on sales data, rich in content, and provide the Foormart.xml file, this file defines all the cubes that need to use the definition set, but we now use our own development of the system defined cube, so this configuration file should not be

Introduction to Mondrian MDX and mondrianmdx Introduction to Mondrian MDX MDX (multidimen1_expression) is the language used to construct and query OLAP databases, just as SQL is used to build and operate relational databases. MDX was the first developed by Microsoft and is part of the 1997 system ole db for OLAP (OD

Mondrian Introduction to MDX MDX (Multidimensional Expression) is the language that constructs the query OLAP database; just like SQL is to build an operational relational database language. MDX was pioneered by Microsoft as part of the 1997 Year system OLE DB for OLAP (ODBO) ;Mosha Pasuma Nsky is One of the MDX language designers;MDX is quickly used by other

The steps to import Mondrian source are as follows:1) Download mondrian-3.0.0.10550 and JPivot 1.8.0, mondrian-3.0.0 later version and JPivot source integration is not together. JPivot hasn't been updated for a long time!!!! : http://mondrian.pentaho.com/2) Create a new Web project in Eclipse and name Mondrian.3) Unzip

Mondrian imports demo data to mysql bitsCN.com Mondrian has not moved mondrian since importing demo data to mysql for a long time. many steps have been forgotten. at the same time, the steps for the old version and the new version are somewhat different. this time, you need to use mondrian3.3, so I will install to use each process to record, for query: Environmen

. July is the taglib of Mondrian performance layer, July is based entirely on JSP + taglib; Another thing that July may not be used to is that it is completely based on taglib rather than the familiar MVC pattern. However, it can easily display multi-dimensional data to end users. The following is the Mondrian architecture diagram provided on the official website. It is clear that the entire project consis

Mondrian has not moved mondrian since importing demo data to mysql for a long time. Many steps have been forgotten. At the same time, the steps for the old version and the new version are somewhat different. This time, you need to use mondrian3.3, so I will install to use each process to record, for query: Environment: windows: Version: mondrian-3.3.0 1. first un

OLAP options in Oracle9 I Database Release 2 introduce the analysis workspace and truly integrate the relational and multidimensional data types in the same Database. So far, the only way for developers and DBAs to use the analytic workspace is to use command line API calls to manually build them. However, with the latest Analytic Workspace Manager (AWM) version, you can better utilize the multidimensional features in Oracle

Mondrian is a standalone engine that is typically used in a way that is embedded in the application, simply by adding a class library to the classpath. There are actually multiple sets of BI solutions that are integrated Mondrian to achieve multidimensional analysis.This article describes how to programmatically connect Mondrian and execute MDX queries. Using

Kylin is a set of OLAP systems developed by ebay, and unlike Mondrian, it is a MOLAP system that is primarily used to support data analytics businesses in the big data ecosystem, It mainly uses the Precomputed method to cache the user-defined multidimensional cubes into hbase (HBase is currently only supported), which is used for both Mondrian and Kylin, and find

Introduction and use of schema-workbench, a schema file generation tool in mondrian, I. Installation 1. Prepare jdk1.5 + 2. Download tool: psw-ce-3.4.1.1 and decompress (address as follows) Schema-workbench Click Open Link3. Copy the corresponding JDBC driver package to schema-workbench \ lib. 4. Modify the workbench. bat file Find the line "rem you shoshould also put mondrian. properties on the calsspath

How to monitor and optimize OLAP databases and monitor olap Databases It is very important to optimize the performance of online analysis and processing. Fortunately, some tools can help monitor and improve the operation of OLAP databases. The Microsoft SQL Server Analysis Service (SSAS) provides a powerful engine used to create and manage data mining applicatio

OLAP introduction (combined with personal work), olap introduction combined with personalOLTP and OLAPTraditional database systems are OLTP and can only provide raw data operations. Analysis is not supported. OLTP system: Performs online transaction and query processing. General supermarket invoicing system, functions: Registration, accounting, inventory and sales records, etc,