The databases will be compressed regularly. A backup is created, before the
compression starts (<database_name>.bck).
The place where this backup will be saved can be set under the Database
tab of Options in the Extra menu. This is by default the directory
where the database file itself is situated.
If an error might occur with the compression, then you could use this backup by
changing the file extension from '.bck' to '.mdb'. Then try to login again.
Compression is important for the integrity and speed of the database.
How often the database have to be compressed, depends on how much data is
added or deleted each day. This will probably be much more for Bill Of Materials
then for Product Information Center.
You can change the frequency of compression, by selecting Options in the Extra
menu.
You can change this setting for each application
The database can only be compressed when there are no users logged in. And while compiling, the database is opened exclusively. This means that when the database will be compressed, no user can log in. When a user attempts to log in, the window Waiting for connection will be displayed. This window will automatically retry to connect after 15 seconds.