diff options
Diffstat (limited to 'doc/install/database_mysql.md')
| -rw-r--r-- | doc/install/database_mysql.md | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/doc/install/database_mysql.md b/doc/install/database_mysql.md index 513ad69ec26..4a2c699129d 100644 --- a/doc/install/database_mysql.md +++ b/doc/install/database_mysql.md @@ -52,3 +52,22 @@ We do not recommend using MySQL due to various issues. For example, case [(in)se mysql> \q # You are done installing the database and can go back to the rest of the installation. + +## MySQL strings limits + +After installation or upgrade is done, remember to run `add_limits_mysql` rake task: + +``` +bundle exec rake add_limits_mysql +``` + +The `text` type in MySQL have different size limit than `text` type in PostgreSQL. In MySQL `text` columns are limited +to ~65kB, where in PostgreSQL `text` columns are limited up to ~1GB! + +`add_limits_mysql` rake task converts some important `text` columns in GitLab database to `longtext` which can persist +up to 4GB characters (may be less if the value contains multibyte characters). + +Details can be found in [PostgreSQL manual][postgres-text-type] and in [MySQL manual][mysql-text-types]. + +[postgres-text-type]: http://www.postgresql.org/docs/9.1/static/datatype-character.html +[mysql-text-types]: http://dev.mysql.com/doc/refman/5.7/en/string-type-overview.html |