I use the backup command to backup tables to a file.

This code has been working fine for a couple of years, and now im starting to see corrupt files in the backup and the backup file will not restore correctly.

I have emailed one of these corrupt backups to the support email address which generates a 11047 error when trying to restore.

My attachment was bounced back from your email server Tim?, Do you still have it, or does it get trashed?

Clive <dd@dd.com> wrote:

I use the backup command to backup tables to a file.

This code has been working fine for a couple of years, and now im starting to see corrupt files in the backup and the backup file will not restore correctly.

I have emailed one of these corrupt backups to the support email address which generates a 11047 error when trying to restore.

Clive,

<< My attachment was bounced back from your email server Tim?, Do you still
have it, or does it get trashed? >>

If you're using a different email address than what we have on file, then
you'll need to send me an email without the attachment, confirm your new
email address using the reply that you receive from our mail server, and
then you'll be able to send the attachment.

--
Tim Young
Elevate Software
www.elevatesoft.com

Clive,

<< This code has been working fine for a couple of years, and now im
starting to see corrupt files in the backup and the backup file will not
restore correctly. >>

Were the backups made with 4.25, or prior to 4.25 ?

--
Tim Young
Elevate Software
www.elevatesoft.com

They where made with v4.25 b4 but the files being backed up come from restored backups from previous versions of DBISAM.


"Tim Young [Elevate Software]" <timyoung@elevatesoft.com> wrote:

Clive,

<< This code has been working fine for a couple of years, and now im
starting to see corrupt files in the backup and the backup file will not
restore correctly. >>

Were the backups made with 4.25, or prior to 4.25 ?

--
Tim Young
Elevate Software
www.elevatesoft.com

Clive,

<< They where made with v4.25 b4 but the files being backed up come from
restored backups from previous versions of DBISAM. >>

Are you re-compiling the DBISAM source code, or using the DCUs ?  From what
I can tell from tracing the restore - the restore's decompression is coming
up with a different image than what was compressed for one of the files, and
this usually points to a compiler range-checking or overflow-checking issue.

Also, if you back up the same tables using the pre-compiled DBSYS utility
that we provide, do they restore okay or not in DBSYS ?

--
Tim Young
Elevate Software
www.elevatesoft.com

I put the dbisam source code path into delphi recently, in the hope I could catch the AVs occuring so I could provide the source code line, so yes the source would be
getting recompiled.

Could it be my Compiler settings?.. I have attached a screen shot of these.

I downloaded v4.25b5 dbsys and backup and restore seem to both work fine.


"Tim Young [Elevate Software]" <timyoung@elevatesoft.com> wrote:

Clive,

<< They where made with v4.25 b4 but the files being backed up come from
restored backups from previous versions of DBISAM. >>

Are you re-compiling the DBISAM source code, or using the DCUs ?  From what
I can tell from tracing the restore - the restore's decompression is coming
up with a different image than what was compressed for one of the files, and
this usually points to a compiler range-checking or overflow-checking issue.

Also, if you back up the same tables using the pre-compiled DBSYS utility
that we provide, do they restore okay or not in DBSYS ?

--
Tim Young
Elevate Software
www.elevatesoft.com

Clive,

<< I put the dbisam source code path into delphi recently, in the hope I
could catch the AVs occuring so I could provide the source code line, so yes
the source would be getting recompiled.

Could it be my Compiler settings?.. I have attached a screen shot of these.
>>

The compiler settings look okay with respect to the ZLib compression code.
However, just to test, what happens if you switch back to using the DCUs
that we provide instead of the source ?

<< I downloaded v4.25b5 dbsys and backup and restore seem to both work fine.
>>

Hmm, either there definitely is something wrong with the compiler settings
that I'm missing, or else D5 (DBSYS) and D7 are generating different ZLib
compression code.

--
Tim Young
Elevate Software
www.elevatesoft.com