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From "Kim Haase (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DERBY-5508) Improve backup/restore documentation visibility and content to encourage proper backups and restore procedures
Date Tue, 17 Apr 2012 19:35:17 GMT

    [ https://issues.apache.org/jira/browse/DERBY-5508?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13255861#comment-13255861
] 

Kim Haase commented on DERBY-5508:
----------------------------------

I'm somewhat confused about another of the items in the list of backup/restore problems: Item
3 mentions incremental backups. How do you do an incremental backup in Derby? There is no
indication that any of the Derby backup procedures does an incremental backup, let alone one
that would "properly track deletes." 

Thanks for any help.

                
> Improve backup/restore documentation visibility and content to encourage proper backups
and restore procedures
> --------------------------------------------------------------------------------------------------------------
>
>                 Key: DERBY-5508
>                 URL: https://issues.apache.org/jira/browse/DERBY-5508
>             Project: Derby
>          Issue Type: Improvement
>          Components: Documentation
>    Affects Versions: 10.8.2.2, 10.9.0.0
>            Reporter: Kathey Marsden
>            Assignee: Kim Haase
>
> 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
backup.
> 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.  
> The relevant doc references are:
> http://db.apache.org/derby/docs/10.8/adminguide/cadminbckupdb.html
> http://db.apache.org/derby/docs/10.8/adminguide/radminconsist24642.html 

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