Re: Update syntax very slow on text colum...
So it sounds like you wrote a script that did a SELECT on a table and then ran through all of those records performing a change. 20 hours seems like a long time for 200,000 records, a few questions which might help diagnose the problem.
A couple of questions.
1) How many records total in the table you are updating?
2) How much text is in each record?
3) Where was the process stuck? How long does it take to SELECT, how long to change, and then how long to process each update?
3) Is there a lot of other database traffic happening at the same time?
4) How many and what kind of indexes are on the table? Are you using fulltext?
Mike
Mike Kruckenberg
Co-author of Pro MySQL (Apress)
http://mike.kruckenberg.com