Important information for >= 3.2.11
When you update from dev@<=3.2.10 or master@<=3.2.2 to newer release, there will be made a SQL conversion of the databases table layout. This can take up a sagnificent amount of time based on the size of the database.
The table layout converion is being made to:
Minimize the total size
Optimize the sql flow and minimizing the read/write to save disk I/O.
Minimize the number of SQL queries being made
It have been seen taking days to convert these tables on very large installations.