i have a split access database (access front-end and access back-end) speed of running query is okey. i decided to up-size access database with access 2010 wizard to sql server. i got some error about different length in related field , i correct error by decrease field length from 255 to 50 and equal them. after up-sizing again i did not get any error but now speed of my running queries in (access-front-end and sql server back-end) is slower than when it has been splited both in access. i do not know how to solve this problem.