Hi, I have read previously that monetdb is intended to be used only when the data can fit in memory. I'm not sure how to interpret this statement - does this mean that the entire database must fit in memory, or does it mean that only the data being operated on when selected from the database must fit in memory? We are wanting to store *huge* amounts of data, ultimately several TBs. The actual data being select at any given time will only be several hundred MBs, however. Is this a reasonable usage of MonetDB? But most importantly, I have noticed that all the row ID indexes are "int" - why the 32 bit limitation? This just seems like a symptom of the above problem; that the entire database must fit in memory. Thanks a lot for your advice, Charles -- Charles Samuels