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From "Knut Anders Hatlen (JIRA)" <j...@apache.org>
Subject [jira] Commented: (DERBY-4196) Document initiation of replication from cleanly shut down database
Date Tue, 14 Jul 2009 10:45:14 GMT

    [ https://issues.apache.org/jira/browse/DERBY-4196?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12730776#action_12730776
] 

Knut Anders Hatlen commented on DERBY-4196:
-------------------------------------------

Thanks for the patch, Kim. The changes look very good to me. I agree that it's best to remove
the description of the exact error message from the paragraph. It's probably OK to leave the
actual message as it is, since the freeze/unfreeze approach is very likely to have been used
if the situation occurs.

+1 to commit.

> Document initiation of replication from cleanly shut down database
> ------------------------------------------------------------------
>
>                 Key: DERBY-4196
>                 URL: https://issues.apache.org/jira/browse/DERBY-4196
>             Project: Derby
>          Issue Type: Improvement
>          Components: Documentation, Replication
>    Affects Versions: 10.4.1.3
>            Reporter: Knut Anders Hatlen
>            Assignee: Kim Haase
>            Priority: Minor
>         Attachments: DERBY-4196.diff, DERBY-4196.zip
>
>
> The admin guide describes how to start replication.
> http://db.apache.org/derby/docs/dev/adminguide/cadminreplicstartrun.html
> It describes two steps that must be performed before the database is copied from the
master to the slave:
> 1. Boot the database on the master system
> 2. Freeze the database (CALL SYSCS_UTIL.SYSCS_FREEZE_DATABASE())
> Those two steps could be replaced with a single step:
> 1-2) Make sure the database on the master system is shut down cleanly
> This works because then there is no recovery to be performed when the database later
is booted in master mode, and neither the log nor the database will be modified during boot,
so the master database will stay completely in sync with the slave.
> Advantages with the alternative procedure are:
> - no need to keep a process running with the database booted and frozen while copying
the database from the master system to the slave system
> - uncommitted transactions that are active at the time of the copying won't cause any
problems (DERBY-3896)

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