Forum Discussion
SSAS Cache
Say i have 10 large models all built in SSAS (no other models)
1 model i decide to make has no refreshes on for a week.
Say i have bookmarks in PBI that dictates what is ran (no one will do extra filtering or adhoc)
Say I go through 10 book marks. Each takes 10 seconds to display results initially.
When i go back through result page return immediately.
Shouldn't we expect that for each user for each day the data would return immediately UNTIL there is new refresh?
I am not seeing that as the case. I thought i would be all in cache.
I assume something must happen that evicts it from cache
What tools do we have to see why it isn't in cache?
I guess what i am looking for is a tool that can show me what causes the eviction.
There must be other processes from other models that are happening that are affecting this.
Ideas?
1 Reply
Hi tinytimothy2 ,
Analysis Services indeed employs caching to enhance query performance. When you execute a query, it tries to retrieve results from the cache first before hitting the underlying data source.
To understand why data isn’t in cache, consider the following tools:
- SQL Server Management Studio (SSMS): Use SSMS to execute the XMLA ClearCache command against specific levels (database, cube, dimension, table, or measure group).
- Monitoring Tools: Monitor system performance and resource usage to identify any processes affecting cache eviction.
- Profiler Traces: Set up profiler traces to capture query execution details and analyze cache behavior.
- Query Execution Plans: Examine query plans to identify bottlenecks or unexpected behavior.
- Event Logs: Check for any warnings or errors related to cache eviction.
Best Regards,
Xianda Tang
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