Re: 9.30 upgrade: 9.40 or 10?

A change in the engine could certainly affect a 4gl program... it happened to me in two ways: 1. Performance. After migration, with update statistics and all that stuff, some programs start behaving very slow... We trace the to a particular query then we have to use hints. 2. Handling of nulls. Same version of 4gl but upgrade of the engine: We used to assume that for Select nulls we can use empty strings (''), it worked but with upgraded engine things were handled properly so code has to be fixed. So all in all, one may suppose that a version upgrade won't break code or performance but that is not the case. Nowadays we *always* demand *user acceptance* in a test environment before we release something. J. There are cases when you can't do that of course, if it is technically impossible. Richard Spitz escribis: > malc_p@btinternet.com schrieb: > > What new libraries do you have do accomodate that make code re-writes > inevitable? > > What about "user acceptance"? Shouldn't the user ideally not notice > anything, except maybe improved performance? > > I don't know about the in-engine-Java you mentioned, but why should a > change in the engine affect the 4GL frontends? > > Regards, Richard sending to informix-list