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From "Kathey Marsden (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (DERBY-5508) Improve backup documentation visibility and content to encourage proper backups
Date Sat, 19 Nov 2011 01:18:52 GMT
Improve backup documentation visibility and content to encourage proper backups

                 Key: DERBY-5508
                 URL: https://issues.apache.org/jira/browse/DERBY-5508
             Project: Derby
          Issue Type: Improvement
          Components: Documentation
    Affects Versions:,
            Reporter: Kathey Marsden

In a very large percentage of cases where users  need to restore their backup, I have found
that they don't have a usable backup to restore.  It is often difficult to determine the root
cause, so I am not sure of all of these, but my experience and suspicions are:
1) They relied on a operating system backup while the database was not shutdown or frozen.
2) They unknowingly backed up a corrupt database over their good backup because  there was
corruption that was not readily apparent at the time of the backup.
3) They relied on incremental backups (even when the database was shutdown) that did not properly
track deletes.
4) They restored to an existing database directory without removing the old one first.
5) They didn't backup because the Derby backup was not included in the embedding application''s
backup procedure.
6) The embedding application's did have a backup/restore procedure but it made one of the
mistakes above.

It would be good to think about our backup and restore documentation to make it more visible
to users and developers and include tips for good backup procedures. Two things I can think
of that might help are.
1) Encourage SYSCS_UTIL.SYSCS_CHECK_TABLE  on all the tables of the database before backing
up to help flag existing corruption before potential existing issues before overwriting a
2) Put pointers in the Getting Started Guide and the Developers guide to the backup instructions
in the Administration manual.

I am sure others have ideas on how to improve the doc. Kim suggested I log this issue and
track the various ideas so she can document them for the next release.  

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