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If you have a working MythTV setup, and you want to try a newer version, both the software, and the database containing details about your recordings, need upgrading.

Usually, a newer version of the software will handle this automatically – even creating a database backup beforehand.

If you haven't upgraded in a long time, however, there might be problems. e.g. the program might say:

Your database version is too old to upgrade with this version of MythTV.
You will need to use mythtv-setup from MythTV 0.22, 0.23, or 0.24 to upgrade your database before upgrading to this version of MythTV.

The mythtv programs give some useful information is you use the -version argument:

mythbackend --version
Please include all output in bug reports.

MythTV Version   : 17686M
MythTV Branch    : branches/release-0-21-fixes
Library API      : 0.21.20080304-1
Network Protocol : 40
Options compiled in:
 linux release using_oss using_alsa using_arts using_jack using_backend using_dbox2 using_directfb using_dvb ...

but that doesn't help you to understand the database, or plugins.

MythTV schemas table

MythTV 0.21, DBSchemaVer=1214

MythTV 0.28-fixes, DBSchemaVer=1344

KnoppMyth versions

KnoppMyth	Kernel		MythTV                  proto
R5A17		2.6.15-chw-2		0.19.20050712-1	27
R5A35		,,		9146M	0.19.20060121-2	,,
R5A39		2.6.15-chw-2	9146M	,,		,,
R5B4		,,		9146M	,,		,,
R5B10		2.6.15-chw-2	9656M			29
R5C7		,,		9871M			,,
R5C45		2.6.17-chw-8	
R5E50		2.6.18-chw-13	12306M			31
R5E74		,,		12964M	0.20.20060828-3	,,
R5E76		,,		13173	,,		,,
R5F1		,,		13420	0.20.20060828-4 31
R5F27		,,		14463M	0.20.20070821-1 31
R5GF8		2.6.22-chw-5	14561M	0.21.20070910-2 36
R5GF21		2.6.22-chw-5	15413M	0.21.20071211-1 ,,
R5GF32		2.6.23-chw-1	15742?
R5.5_RC5	2.6.23-chw-4	16614M	0.21.20080304-1 40
LinHES 6.00.05			19622M	0.21.20080304-1	40