While creating the partitions we must specify either of the below storage settings.
a) ROLAP (Related OLAP): In this case data and aggregations store under relational sources.
b) MOLAP (Multidimensional OLAP): Here data and aggregations store under multidimensional sources.
c) HOLAP (Hybrid OLAP): Here the data stores under relational sources and aggregations store under multidimensional sources.
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The feature helps the cube in a sink with the relational data sources.
–> It takes the latency time, schedule time, and event table to capture the changes from relational data sources cube databases.
As noted, with MOLAP and HOLAP storage modes, SSAS caches data (MOLAP storage mode only) and aggregations (both MOLAP and HOLAP) on the server.
When you take a data “snapshot” by processing a cube, the data becomes outdated until you process the cube again. The amount of OLAP data latency that is acceptable will depend on your business requirements.
In some cases, your end users might require up-to-date or even real-time Information.
will depend on your business requirements.
In some cases, your end users might require up-to-date or even real-time Information.
A New feature of SSAS 2005, PROACTIVE CACHING, can help you solve data Latency Problems
TIPS FOR EXAMS
Proactive caching is especially useful when the relational database is transaction-oriented and data changes at random
when data changes are predictable
Step 1:
HOW PROACTIVE CACHING WORKS
When you enable PROACTIVE CACHING, the server can listen for data change notifications and can update dimensions and measures dynamically in an “AUTOPILOT” mode.
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FOR EXAMPLE
If data changes are occurring in batches, you do not want to start rebuilding the cache with each data change event.
Instead, you can optimize proactive caching by defining a silence interval that allows a predefined amount of time for the batch changes to complete.
After data in the relational database is changed, the server knows that the MOLAP cache is out of date and starts building a new version of the cache
STEP 6: The latency stopwatch specifies the maximum latency period of the MOLAP cache, the administrator can also predefine the maximum latency period. During the latency period, queries are still answered by the old MOLAP cache.
When the latency period is exceeded, the server discards the old cache. While the new version of the MOLAP cache is being built, the server satisfies client queries from the ROLAP database
Step7: When the new MOLAP cache is ready, the server activates it and redirects client queries to it.
PROACTIVE CACHING enters a steady-state again until the next data change event takes place.
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