RE: [DUG]: Paradox Corrupt File
Turn off write behind caching in NT and 95/98, or move to a client/server database :). Regards, Dennis. -Original Message- I get the same thing with one of my clients (app written in BCB4), all of their machines are NT4 Workstation. I have attributed it to the following: a) main data file is over 100MB even though this isn't meant to be a problem b) slow network c) not all machines have BDE configured optimally. As for the third part, I have configured the BDE on a few of the machines to increase the number of file handles, buffer sizes, etc., and this seems to have improved their performance. I'm not convinced that it will solve the index corruption problems. My guess is that it is the combination of a) and b) above that cause the problem. As yet I haven't found a way around this. Regards, Bevan HI All, I have a Delphi 3 App deployed using Paradox Database. We always run into Corrupt file problems the message that usually comes up is "Corrupt File - Other than header Filename.db". I use Borland's "DTutil32" to fix the problem and that usually fixes it. Sometimes I have to remove the indexes from the database tables and then recreate them and that also fixes the problem. Just to tell you a little bit about the working environment in which the Delphi programs are running. What we do is transfer Paradox database files from another office and then copy them into our current database sometimes this process works ok but sometimes it gives me the Corrupt file error. But my actual problem is that I get this error message every other day and I was wondering if any of you know the reason for this and a solution if there is any? Thanks in Advance, Mohsin -- -- Name: winmail.dat winmail.datType: PLAYER File (application/x-pn-mpg) Encoding: base64 -- Bevan Edwards mailto:[EMAIL PROTECTED] Achieve Software Limited http://www.achieve.co.nz Phone:(64-9) 444-4210 ICQ: 732011 Fax: (64-9) 444-4201 Mobile: (64-21) 979-603 -- - New Zealand Delphi Users group - Delphi List - [EMAIL PROTECTED] Website: http://www.delphi.org.nz --- New Zealand Delphi Users group - Delphi List - [EMAIL PROTECTED] Website: http://www.delphi.org.nz
Re: [DUG]: Paradox - Corrupt file
Mark, Paradox is famous for corrupt files. I have found over the years that it is generally an index problem caused by users not shutting programs down properly or Windows crashing etc. There are various things you can do to minimise it but I haven't used Paradox since Delphi 2 so maybe others can give you some tips for later Paradox versions. A pack/repair utility (quite a few are available) is almost essential to distribute with your application. This way the user can fix it themselves (doesn't look good from a user perspective, however they get used to it). Laurence Bevan --- New Zealand Delphi Users group - Delphi List - [EMAIL PROTECTED] Website: http://www.delphi.org.nz
Re: [DUG]: Paradox - Corrupt file / Databases
Borland have a sample app with source that uses the TTUtility and I never found a case where it hasn't fixed it. As someone else said you need the correct TTutility.dll for the BDE version your user has. I have build it into my apps like I used to do with VB and Access (compress and repair) many years ago, and tell users to run it on a regular bases to keep there database. If you can't find the source let me know, but have a look under the BDE file area. And while everyone is on the subject of databases I personally find MS SQL Server great most of the time (except when it goes a-wall and uses up 100% of the resources and leaves you with little choice but to reboot the server). When I changed to delphi 1 from VB I missed Access I found paradox a bit incomplete but it was free so I adjusted. We did one project with IB back in delphi 1 and yeah the interfaces were pretty horrible then. We have now been using MS SQL for the past 3 years and found it pretty good overall. I still use paradox for small projects and use MS SQL for large 1 - 2 Gig databases. We have only just started using SQL 7 and found quite a few problems (Mainly because we drived in and installed it on site without thashing it first). The new ISQLW (Query Anal) is horrible and they must have used different programmers on this version. It would be nice if they extended the SQL language to allow you to write your own functions you could use within a query (eg. like GetDate()). -Original Message- From: Mark Howard [EMAIL PROTECTED] To: Multiple recipients of list delphi [EMAIL PROTECTED] Date: Tuesday, 2 March 1999 23:00 Subject: [DUG]: Paradox - Corrupt file Hi all Novice question Have a Delphi 3 app deployed using Paradox database. User today reported message saying "Corrupt File - other than header FileName.DB" Can you people who are doing this stuff every day tell me what you do in this situation. What is the immediate fix, if there is one - other than backup? Is it likely to be caused by a design fault or is it "just one of those things". Having occurred once, does that mean it is likely to occurr again? --- New Zealand Delphi Users group - Delphi List - [EMAIL PROTECTED] Website: http://www.delphi.org.nz
RE: [DUG]: Paradox - Corrupt file
Mark, Download TUtility from Borland (Inprise, whatever) and run it against your files. I would advise that you do a verify before fixing. I have found that while this utility fixes the problem, it can cause records to be "lost" from the database. It is best to restore from backups. This is particularly important if you get "Blob has been modified" problems. HTH. Dennis. Hi all Novice question Have a Delphi 3 app deployed using Paradox database. User today reported message saying "Corrupt File - other than header FileName.DB" Can you people who are doing this stuff every day tell me what you do in this situation. What is the immediate fix, if there is one - other than backup? Is it likely to be caused by a design fault or is it "just one of those things". Having occurred once, does that mean it is likely to occurr again? In this case we were able to go back to a very recent backup - but not everyone is as well organised. Any and all wisdom will be appreciated. --- New Zealand Delphi Users group - Delphi List - [EMAIL PROTECTED] Website: http://www.delphi.org.nz
