Peter Boncz wrote: > Hi Stefan (the non-german .de one) > > session. > > I also recall that in case of the Skyserver TB dataset, key checking was > disabled to to similar problems. > No. The key checking was initially turned off, because the hash table (32-bit) could not well cope with the 13.000.000.000 tuples in the table, causing lengthly hash collisions chains. It took a day....to handle the request. Work is in progress to speed this up using a straightforward clustering on the built-in hash. The preliminary code has been checked in. > > PS > The likely cause for the problem is a shortage of swap space. Increasing > your swap file size (with a few 10s of GB) should be a workaround for the > problem. > The swap space set aside for Skyserver was 128G > > > ------------------------------------------------------------------------- > This SF.Net email is sponsored by the Moblin Your Move Developer's challenge > Build the coolest Linux based applications with Moblin SDK & win great prizes > Grand prize is a trip for two to an Open Source event anywhere in the world > http://moblin-contest.org/redirect.php?banner_id=100&url=/ > _______________________________________________ > Monetdb-developers mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/monetdb-developers >
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