: Can I know why? I thought solr is tuned for string if no sorting of facet by : range query is needed.
"tuned for string" doesn't really mean anything to me, i'm not sure what that's in refrence to. nothing thta i know of is particularly optimized for strings. Almost anything can be indexed/stored/represented as a string (in some form ot another) and that tends to work fine in solr, but some things are optimized for other more specialized datatypes. the reason i suggested that using ints might (marginally) be better is because of the FieldCache and the fieldValueCache -- the int representation uses less memory then if it was holding strings representing hte same ints. worrying about that is really a premature optimization though -- model your data in the way that makes the most sense -- if your ids are inherently ints, model them as ints until you come up with a reason to model them otherwise and move on to the next problem. -Hoss
