3.2 Restrictions

In the single-user case at most one program at a time should open a given persistent store in order to avoid problems with concurrent access.

If multiple programs are going to use the same persistent store, the multi-user version should be used.

As already mentioned, application programs exploiting object persistence should not include multiple source files with the same name.

Component objects, i.e. objects with their own execution stack, are not allowed in the transitive closure of persistent roots. If components are met during a checkpoint operation, the program will terminate with an error message.