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https://issues.apache.org/jira/browse/DERBY-2969?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12566941#action_12566941
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Jørgen Løland commented on DERBY-2969:
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Hi Kim,
These changes makes it much more clear that the backup functionality does not
block transactions. I have no comments to cadminhubbkup01.html, but I wonder if
the following would make it even clearer that transactions are not blocked
during any part of the backup process.
The SYSCS_UTIL.SYSCS_BACKUP_DATABASE procedure puts the database into a state
in which it can be safely copied. The procedure then copies the entire original
database directory (including data files, online transaction log files, and jar
files) to the specified backup directory. Files that are not within the
original database directory (for example, derby.properties) are not copied.
With the exception of a few cases mentioned in Unlogged Operations, the
procedure does not block concurrent transactions at any time.
> Admin Guide: Document that online backup is non-blocking
> --------------------------------------------------------
>
> Key: DERBY-2969
> URL: https://issues.apache.org/jira/browse/DERBY-2969
> Project: Derby
> Issue Type: Improvement
> Components: Documentation
> Affects Versions: 10.2.2.0, 10.3.1.4, 10.4.0.0
> Reporter: Jørgen Løland
> Assignee: Kim Haase
> Priority: Minor
> Attachments: cadminhubbkup01.html, cadminhubbkup63476.html,
> DERBY-2969.diff
>
>
> The Admin Guide does not mention that the online backup functionality is
> non-blocking. The information that a backup can be made without blocking
> transactions may be of great interest to administrators.
> Furthermore, this sentence implies that online backup is performed by
> *blocking* updates:
> "The SYSCS_UTIL.SYSCS_BACKUP_DATABASE() procedure puts the database into a
> state in which it can be safely copied, then copies the entire original
> database directory (including data files, online transaction log files, and
> jar files) to the specified backup directory.
> Admin guide, online backup:
> http://db.apache.org/derby/docs/dev/adminguide/cadminhubbkup63476.html
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