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From "Suresh Thalamati (JIRA)" <derby-...@db.apache.org>
Subject [jira] Created: (DERBY-929) Backup can delete a directory (another database or a plain directory) if database name matches with an existing directory in the backup path.
Date Tue, 07 Feb 2006 01:52:57 GMT
Backup can delete  a  directory  (another database or  a plain directory)  if   database name
matches with  an  existing directory in  the backup path. 
--------------------------------------------------------------------------------------------------------------------------------------------------------

         Key: DERBY-929
         URL: http://issues.apache.org/jira/browse/DERBY-929
     Project: Derby
        Type: Improvement
    Reporter: Suresh Thalamati
    Priority: Minor


As part of the  backup  process if   a database already exists in the backup path with same
name already . it renames it to ..OLD and deleted  it  if backup is successful.  I think 
this was done  to help users  to replace old backups easily  with a new backup. 

Unfortunate side effect  is if   db name happens to be  same as  another directory in the
databases path ,it will get deleted. 

There were some negative comments about  this behaviour in  the book "Apache Derby -- Off
to the Races:"   with example of   C:/   as  backup path and   WINDOWS as the database name.
   

Possible solutions:

1)   Remove the replacking existing backup functionalty and throw  a error  if   there  is
already  a file  in the backup path  with same  name as database. 

2)  Throw  error only  if the  file is not   a database directory   by checking for  service,properties


I like the first approach ,    users typically  will create  a backup path  with suffix as
timestamp or something like that.    If they want to really replace ,  users can  delete the
existing backups.   One problem is  if some existing customer is relying on this functionalty,
 it will break their  backup code. 
 

Any suggestions ?

Thanks
-suresh
 







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