[mythtv-users] From trunk to stable...
R. G. Newbury
newbury at mandamus.org
Tue Nov 13 03:12:46 UTC 2007
Matt Roberts wrote:
> (I'm re-sending this with an appropriate subject line)
>> I'm considering to change fron svn trunk to 0.20-fixes branch.
>> How about mysql database? I know, that trunk has updated database schema.
>> What is easiest way to revert back? I have made much changes to settings
>> and I don't want to loose them. Also I'd like keep all data from
>> recordings, autoexpire etc.
>> If I drop all tables and recreate them with mc.sql, what tables I can
>> safely recover from backup to new database? Or is there any that has no
> I don't know if there's an easy way to revert back, but I can tell you what I
> did a few weeks ago after discovering that the trunk was too volatile for my
> I started with the instructions for moving data to new hardware
> (http://www.mythtv.org/docs/mythtv-HOWTO-23.html#ss23.7). It lists the 7
> tables that are really important to preserve. The specific steps I took (as
> I remember them) were:
> 1. Create a restore script as described in the "Moving Your Data to New
> Hardware" instructions
> 2. Create a script that will create the table structure for those 7 tables as
> they exist in the currently installed version of myth
> 3. Create a backup of the settings and channel tables. These were for future
> reference only, in my case. I didn't try to directly restore them.
> 4. Drop all tables
> 5. Uninstall 0.21
> 6. Install 0.20
> 7. Execute a myth program (mythtv-setup) so that all tables get created
> (mc.sql does not do this, it only creates the database, user, and grants some
> 8. Edit the scripts created in steps 1 & 2 so they will restore the data to
> tables with a unique name. I used '<table_name>_21', so 'recorded'
> became 'recorded_21', etc.
> 9. Run the create and restore scripts
> 10. Compare the column list of the 0.20 tables with that of the 0.21 tables
> and write some "insert into 0.20_table (select columns from 0.21_table)" SQL
> statements that only pull data from columns common to both versions.
> 11. Run the SQL statements created in step 10.
> It worked for me. The one thing that I have left which may be of value to you
> is my "step 10" SQL. I assume it is still valid since I was downgrading to
> 0.20.2. Let me know if you'd like me to send it to you.
Flesh this out a little, with a longer explanation and post it on the
wiki. I'm sure there are others out there who may want or need to do
what you have done.
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