Only applies if running MySQL database created with GitLab 6.7 or earlier. If you are not experiencing any issues you may not need the following instructions however following them will bring your database in line with the latest recommended installation configuration and help avoid future issues. Be sure to follow these directions exactly. These directions should be safe for any MySQL instance but to be sure make a current MySQL database backup beforehand.
# Secure your MySQL installation (added in GitLab 6.2)
sudo mysql_secure_installation
# Login to MySQL
mysql -u root -p
# do not type the 'mysql>', this is part of the prompt
# Convert all tables to use the InnoDB storage engine (added in GitLab 6.8)
SELECT CONCAT('ALTER TABLE gitlabhq_production.', table_name, ' ENGINE=InnoDB;') AS 'Copy & run these SQL statements:' FROM information_schema.tables WHERE table_schema = 'gitlabhq_production' AND `ENGINE`<> 'InnoDB' AND `TABLE_TYPE` = 'BASE TABLE';
# If previous query returned results, copy & run all outputed SQL statements
SELECT CONCAT('ALTER TABLE gitlabhq_production.', table_name, ' CONVERT TO CHARACTER SET utf8 COLLATE utf8_general_ci;') AS 'Copy & run these SQL statements:' FROM information_schema.tables WHERE table_schema = 'gitlabhq_production' AND `TABLE_COLLATION`<> 'utf8_unicode_ci' AND `TABLE_TYPE` = 'BASE TABLE';
# If previous query returned results, copy & run all outputed SQL statements