SSAS Tabluar RAM Requirements

Bill Anton looks at ensuring your Tabular server has enough RAM:

In addition to being an “in-memory” technology, Analysis Services Tabular is also a “column-store” technology which means all the values in a table for a single column are stored together. As a result – and this is especially true for dimensional models – we are able to achieve very high compression ratios. On average, you can expect to see compression ratios anywhere from 10x-100x depending on the model, data types, and value distribution.

What this ultimately means is that your 2 TB data mart will likely only requrie between 20 GB of memory (low-end) and 200 GB (high-end) of memory. That’s pretty amazing – but still leaves us with a fairly wide margin of uncertainty. In order to further reduce the level of uncertainty, you will want to take a representative sample from your source database, load it into a model on a server in your DEV environment, and calculate the compression factor.

Read the whole thing; Bill has several factors he considers when sizing a machine.

Related Posts

SSAS HA

James Serra enumerates high availability options for SQL Server Analysis Services: If you are looking at providing high availability (HA) for SSAS, here are 3 options: Install SSAS on a Windows Server Failover Cluster (WSFC)Here’s a good article. The main issue with this option is that SSAS isn’t cluster-aware, so if windows is “OK” but […]

Read More

Power BI: Calculated Measures + SSAS Tabular

Shabnam Watson notes that the May updates to Power BI Desktop allow you to create new calculated measures on a report which connects live to a tabular model: Ideally the SSAS database has all the measures you need but now you have the capability to add new ones if you need to. You can control […]

Read More

Categories

December 2016
MTWTFSS
« Nov Jan »
 1234
567891011
12131415161718
19202122232425
262728293031