[EP-tech] Re: Adding fields to a live system - any data integrity concerns?
anbeeken at lincoln.ac.uk
Mon Jul 21 08:51:18 BST 2014
Okay, so I take it when Apache is stopped you can still run Perl scripts
on the server (epadmin etcŠ)?
On 18/07/2014 16:57, "Sebastien Francois" <sf2 at ecs.soton.ac.uk> wrote:
>Also stop the indexer when you stop apache and restart the indexer when
>you restart apache.
>On 18/07/14 16:49, Jan Ploski wrote:
>> If you want to do it as a hotfix, the proper procedure would be to
>> 1. Add expected columns and indexes to database tables
>> 2. Add the field definition (which depends on 1)
>> 3. (optional) Run whatever initialization scripts you need to run for
>> the field
>> 4. apachectl graceful
>> Unfortunately, EPrints tools assume that you add the field definition
>> first and that they then update the database for you. This leaves a
>> window of inconsistency during which your users will get errors.
>> Obviously, if you don't mind a short service interruption, it's not a
>> concern and you can do it "offline" during a maintenance window:
>> 1. apachectl stop
>> 2. Add field definition
>> 3. Use epadmin to update database
>> 4. (optional) Run whatever initialization scripts you need to run for
>> the field
>> 5. apachectl start
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