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Extreme load and “the operation has been cancelled”
18 September 2011 23:03

There are many reasons why SSAS may generate an operation has been cancelled but i want to take you through a new, although rare, one that i recently discovered. To set the scene I had been tuning the Process Index phase on one of our servers so we could fit a full reindex of a 1.8TB cube comfortably into a maintenance slot over the weekend. I will write another... Read More...

by ACALVETT | with no comments

Filed under: Tips, Performance, Analysis Services, SSAS, 2008, Windows 2003, Processing, SSAS 2008, Operation, Cancelled, W2K3

Parallelism, CPU Time & DMV’s
30 May 2011 12:04

Whilst reviewing the CPU statistics of a system that i knew was CPU bound i found the numbers were not adding up and i was not seeing the code i expected to see as a top CPU consumer so i decided to going digging. I quickly identified that if the query has gone parallel it: Only shows as one thread in sys.dm_exec_requests because sys. dm_exec_requests does not... Read More...

by ACALVETT | with no comments

Filed under: SQL 2005, Tools, Tips, Performance, Database Engine, 2008, 2008 R2, SQL 2008, CPU, Parallelism, DMV

SSAS Deployment essentials
30 March 2011 00:50

Over the recent years i have enjoyed the privilege of working on a number of different SSAS deployments. Some are huge, some are complex and some of them are huge and complex and most interestingly they all behave differently. What i want to share today is what i consider to be essential for an SSAS installation. This covers what i expect to see installed to... Read More...

by ACALVETT | 2 comment(s)

Filed under: Tools, Tips, Performance, SSAS 2005, Analysis Services, SSAS, 2008, SSAS 2008 R2, 2008 R2

SSAS – Synchronisation performance
08 April 2010 00:15

I’ve always thought of SSAS synchronisation as a clever file mirroring utility built into SSAS and i have never considered the technology as bringing any performance gains to the table. So, its a good job I like to revisit areas…. :) I decided to compare the performance of robocopy and SSAS Synchronisation between 2 Windows 2003 servers running SSAS 2008 SP1... Read More...

by ACALVETT | 2 comment(s)

Filed under: Performance, Analysis Services, SSAS, 2008, Synchronization, Synchronisation

Exploring backup read io performance
24 January 2010 14:12

I was recently exploring how to increase the backup read throughput on one of our SQL servers. Below are some interesting facts i found. I would say that one of the most important reminders that came from the exercise is, do not assume that 2 databases being backup up on the same server using an identical backup command means that the processes are identical... Read More...

by ACALVETT | with no comments

Filed under: SQL 2005, Tips, Performance, Database Engine, 2008, Backup