Kees Nuyt, Thank you for very impressive and excellent reply to our question. I will show it to my boss and ask him for the data necessary to answer your question. I will also ask my boss , who is a director of product development, whether he will allow us to try to implement your producer -consumer multithreaded suggestion. Thank you for your help. _______________________________________________ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users