What kind of situation will delete persistence query cache?

Hi Experts.
as far as I know persistent cache (cluster table) will not invalidated unless data is uploading or bex query is changed.
but sometimes cache is disappear even qube updating time and query generating time have nothing changed.
what other circumstance can cause invalidate persistence cache?
does persitence cache also invalidated by LRU algorism?
thanks in advance.
Lee.

Hi Sang Hyun,
When you execute several parallel queries, some processes remain in an OLAP cache lock for a very long time.
Please have a look at SAP Note 1053682 - OLAP cache: Enqueue deadlock in invalidation/parallelism and Correction Instructions mentioned in SAP Note 1050089 OLAP cache: Enqueue deadlock in extensive parallelism .
Please post with your findings.
Hope this Helps.
Thanks
CK

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