I'm using MODIFY to change (shrink) a number of VARCHAR fields of various lengths in various tables. In each case, the field is called ip and is a textual representation of an IPv4 or IPv6 address. To ...
One user called today because he has tried to enlarge a VARCHAR column (from 20 to 100) in a slightly large table resulting in a write-locked table. I watched PROCESSLIST and saw that ALTER TABLE ...
We have a 3rd party application of which we don't have the source code. This application executes queries on our database without using the "N" prefix before literal strings. It does this in inserts ...
I read the following answers in this forum: What is the performance impact of using CHAR vs VARCHAR on a fixed-size field? MySQL: Does the order of the fields in a table make a difference in ...