TotalSizeKB is the size of that partition or table on disk for the given object id & index id. CachedKB is how much of it is in cache. So in the above case - assuming the IndexID=0 and we are talking about the table, then ~3GB of the table is in cache, and the table is ~8GB in size. Seems a bit high - either table is widely hit (e.g. a lot of reports, or it is a fairly volatile or highly referenced table) or indexing isn't very distinctive
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