What are the different types of storage modes?

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There are three standard storage modes in OLAP applications.

1) MOLAP

2) ROLAP

3) HOLAP

When ever the cube process is going on then it process leaf level data(detailed data) and creates Aggregations based on the Aggregation design defined in the cube. Now lets see about these in detail –

MOLAP – Stores Detailed data and Aggregations in the form of binary files and these are completely separate from relational database.

ROLAP – Stores Detailed data and Aggregations in the relational database.

HOLAP – Stores Detailed data in relational database and Aggregations in the form of binary files.

PFB the difference between these three –

Storage Mode Storage Location for Detail Data Storage Location for Summary/ Aggregations Storage space requirement Query Response Time Processing Time Latency
MOLAP Multidimensional Format Multidimensional Format MediumBecause detail data is stored in compressed format. Fast Fast High
HOLAP Relational Database Multidimensional Format Small Fast for aggregated data and Slow when trying to read Leaf level data. Fast Medium
ROLAP Relational Database Relational Database Large Slow Slow Low

There is one main difference between ROLAP and MOLAP i.e ROLAP supports REAL TIME Data where as MOLAP doesn’t. Real time in the sense when a record is inserted into fact table then it should be immediately available for analysis. It doesnot happen if you use MOLAP storage mode and to pull newly added record in MOLAP storage mode we need to process cube. In ROLAP as the data is storing in relational databases, when ever a record is inserted into table it will be available for analysis.

Regards,

Roopesh Babu V

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