[mythtv-users] Migration of recordings database to different / newer system
Michael T. Dean
mtdean at thirdcontact.com
Sat Jan 1 00:14:33 UTC 2011
On 12/31/2010 11:51 AM, Will Dormann wrote:
> I'm in the progress of migrating from an old Mythtv 0.21 system to a
> completely different 0.24 system. (different hardware, different
> capture device, different mythtv configuration, etc.)
> What is the best way to migrate the existing recording database
> information to the new system? I've tried the steps outlined here:
That page is broken--and years out of date--and Google should be slapped
for showing it to you.
> but the problem I'm running into is going from 0.21 to 0.24. The tables
> have changed between the versions and while I do see my recordings, just
> browsing through them gives errors in the mythfrontend log:
> 2010-12-31 11:20:28.870 Error preparing query: SELECT bookmarkupdate
> FROM recorded WHERE chanid = :CHANID AND starttime = :STARTTIME
> 2010-12-31 11:20:28.871 Driver error was [2/1054]:
> QMYSQL3: Unable to prepare statement
> Database error was:
> Unknown column 'bookmarkupdate' in 'field list'
> I'm sure there will be other problems with having 0.21 recording data in
> a 0.24 system.
> I know that if the entire database is using an old schema, mythbackend
> will update the schema when it starts up. However, if just a few tables
> are using the old schema, it doesn't seem to trigger the database update.
> Is there a way to manually update the relevant tables to the new schema?
> Or another technique for migrating recordings to a newer and different
> system? I see the "partial restore" option here, but it mentions the
> need to reconfigure mythtv, so that doesn't seem like a great option.
> Any hints?
You want to do a full restore of your old database to your new system (
). In the event that the new system has a new host name, you must then
immediately after restoring the database--and /definitely/ before
starting any MythTV program on the new system.
There is no concept of "migrating" recordings or databases in
MythTV--that's just a "myth" propogated by Google's leaving a bad,
outdated (and wrong) link as #1 result for the search "migrate mythtv
Instead, the only thing you need to do is move your database and
recordings (and, if you change host names on the system, change that
host name in the database). MythTV will automatically upgrade the
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