We have a Cube of 30 GB in size and one of the query/session is showing Session_Read_KB as around 24 GB (25908085 in Discover_session).
Does this mean Query is reading 24 GB data from disk to answer query? Does data in this column represents physical Disk I/O or is it from cache?
We are struggling with poor query performance for all of users so in process to identify bottleneck.
Any insight would be appreciated.
Thanks,
Umesh.