Category:MySQL

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MySQL

This is the Database system used with MythTV. MySQL is a very versatile database system, used with many projects and web sites. For more info on MySQL itself, see http://www.mysql.com. For info on the MySQL database used with Myth, read on.

Database Schema

If you run into trouble with some of your MythTV tables or are looking for information on how the system is stored, browse the Database Schema for more information.

Questions and Answers

Q: My database seems b0rked
A: Try these magic incantations, it will try to fix broken databases:

mysqlcheck -r -u mythtv -pmythtv mythconverg

If you only want to check which part of the data base that is broken, run mysqlcheck without the -r.

Q: When running mysqlcheck I get the error message "Access denied for user ..."
A: The problem may be that you are using the wrong password. The following commands will change the mysql password to "mythtv":

# mysql -u root -p mysql
myqsl> GRANT ALL PRIVILEGES ON *.* TO 'mythtv'@'localhost'
    -> IDENTIFIED BY 'mythtv' WITH GRANT OPTION;
mysql> UPDATE user SET Password=PASSWORD('mythtv') WHERE user='mythtv';
mysql> FLUSH PRIVILEGES;
mysql> quit

Note that you will have to change the database password in the mythtv setup to "mythtv" once you get it running again.

Q: I'm getting a SQL error from mythbackend when upgrading. What does that mean?
A: Try using perror to get more information

2004-05-25 22:56:24 Upgrading to schema version 1046
2004-05-25 22:56:24 Upgrading to schema version 1047
DB Error (Performing database upgrade):
Query was:
ALTER TABLE record ADD COLUMN search INT UNSIGNED NOT NULL DEFAULT 0;
Driver error was [2/-1]:
QMYSQL3: Unable to execute query
Database error was:
Error writing file './mythconverg/#sql-785_2.frm' (Errcode: 28)

For future reference you can use perror with the mysql error number:
$ perror 28
Error code  28:  No space left on device

also check etc/mythtv/mysql.txt it should look like this:

DBHostName=localhost
DBUserName=mythtv
DBName=mythconverg
DBPassword=mythtv