Hi Stefan, If monetdb doesn't maintain any caching then when i am creating test1 database which contain demo table which contain 100 million records. When first time i am executing "SELECT SUM(V1) FROM DEMO;" monetdb gives me result in (11.4s) when immediate i am trying to execute same query "SELECT SUM(V1) FROM DEMO;" It gives me result in (31.065ms) How / why this happen? I have also checked my OS memory cache and I have erased OS Memory cache. Now, I am trying same query "SELECT SUM(V1) FROM DEMO;" now also he take same time in milliseconds approximate(30.723ms) why he first time take lot of time and every next time he take negligible time. I hope you will clear my problem related of throughput time. -- Regards, Swapnil K. Joshi _______________________________________________ users-list mailing list users-list@monetdb.org http://mail.monetdb.org/mailman/listinfo/users-list