User`s guide

HOW TO USE: Fixing your database files
Fortunately, it seems to happen
most often to programmers. It's
indeed fortunate for us, since
they've taken the time to create
some very useful techniques and
tools that will help us fix broken
database files.
The most secure cure:
use an up-to-date backup
The best way to cure a broken data-
base is to
throw it away. Delete it
from the disk
and start over with a
recent backup of the database file.
However, before you delete
the damaged file, do the following.
Terminate all applications
and exit
System Manager (use More Menu
Application Terminate All OK).
Switch
to the drive that holds your
database files and type in the DOS
command CHKDSK and press
Enter. If you get a message that
tells you that your disk has errors,
use the
CHKDSK IF command to
"fix" the problem. Better yet, if you
have a program such as Norton's
Disk Doctor, try using that to
repair the files. When you're confi-
dent that your RAM disk is in
working order, reload System
Manager and try opening the data-
base again.
If you still get an error mes-
sage, then it's time to fetch the
backup file. Begin by renaming the
backup file to something like
ZZZ.xDB (where the "x" would be
an "A", "G", "N", "P", or "W",
depending on the type of database
file: ApptBook .ADB file; Database
.GDB file;
NoteTaker .NDB file;
Phone Book .PDB file; or
WorldTime .WDB file). Load this
"ZZZ" file into the application pro-
gram.
Why rename the file and load
it? Well, if you backup your palm-
top frequently, you may have inad-
vertently backed-up an already
broken file. If that's the case, it
doesn't make sense to overwrite
one broken file with another one. If
the back-up file is good, close the
application and use Filer to delete
the broken file and rename the
ZZZ.xDB file. You'll have to re-
enter any records that were added
or changed since the last backup.
How current your backup file is
will determine the
amount of work
involved.
Less sure (but useful)
file recovery techniques
If your backup files are unusable,
there are still some things you can
do to recover as much information
as possible.
Merge the file
If you're able to start an application
but the database file causes a
"Record Not Found" error message
to
appear on the screen, press the
(Enter) key
and choose the (Menu)
file New ... command. This will cre-
ate a
new database with the same
layout as the errant one. Then use
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12 THEHPPALMTOPPAPER SEPTEMBER/ OCTOBER 1997