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Serge Monkewitz writes: > Chunk ids probably fit into 2 bytes with the current baseline 20k chunks, > but chunk IDs are not contiguous integers so I’m not 100% sure. I have been running all of my tests using full ints (4 bytes), not shorts. There used to be a small performance bump if they are aligned (although that may not be important with 64-bit machines), and I agree with Serge about not limiting the identifiers to < 65536 (e.g., for more chunks, or to merge "subchunks" into a single ID). I am using "unsigned long long" (aka BIGINT) for the objectID, and not making any assumptions about compacting it to fewer bytes. -- Mike ######################################################################## Use REPLY-ALL to reply to list To unsubscribe from the QSERV-L list, click the following link: https://listserv.slac.stanford.edu/cgi-bin/wa?SUBED1=QSERV-L&A=1