I’m using Ubuntu 16.04.3 and mysql Ver 14.14 Distrib 5.7.22. When I try to alter my db table column with the following command the database appears to freeze; mysql> alter table records modify column name varchar(150); Table size is 2.8MiB (6,000 records). I’m simply trying to change the varchar(150) part. I have tried to do the same thing in GUI