utf8, 4.1, and character length truncation in mysql system tables
I changed the default character set on a 4.1 server to utf8. As expected, this caused the lengths of character fields to be shortened, requiring alter table to be run on them to extend the lengths. But I didn't expect that this would also shorten the mysql system tables (the mysql db), so that usernames for newly inserted users have been truncated to fit the next field lengths. Is this a known issue? Should I set the character set for the mysql db back to latin1? Running alter table on the mysql tables to extend all of the column lengths seems like a bad idea, but seems like what's recommended for other tables in the manual. Also, on a related note, these are really big tables, and running alter table on them to modify the column lengths is taking a LOOONG time. Any hints on speeding this up? -- - Adam ** I can fix your database problems: http://www.everylastounce.com/mysql.html ** Blog... [ http://www.aquick.org/blog ] Links.. [ http://del.icio.us/fields ] Photos. [ http://www.aquick.org/photoblog ] Experience. [ http://www.adamfields.com/resume.html ] Product Reviews: .. [ http://www.buyadam.com/blog ] -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/[EMAIL PROTECTED]
Re: utf8, 4.1, and character length truncation in mysql system tables
On Thu, May 12, 2005 at 10:08:33PM +0300, Gleb Paharenko wrote: Hello. Is this a known issue? It is interesting for me. According to the: http://dev.mysql.com/doc/mysql/en/charset-metadata.html MySQL stores usernames in utf8. Yes, you should convert your tables to utf8, however, in my opinion, you don't have to do this with 'mysql' database. Could you lose the characters from the users' names due to other reasons (wrong character set for your client application)? I suppose that's possible. This was done through the stock mysql client, which defaults to latin1 even if you set the server character set to utf8 (which makes sense, as most terminals don't support utf8). Is there something else I should be doing to create new users post 4.1? Is this behavior something I should be worried about? (I am, currently.) Adam Fields [EMAIL PROTECTED] wrote: I changed the default character set on a 4.1 server to utf8. As expected, this caused the lengths of character fields to be shortened, requiring alter table to be run on them to extend the lengths. But I didn't expect that this would also shorten the mysql system tables (the mysql db), so that usernames for newly inserted users have been truncated to fit the next field lengths. Is this a known issue? Should I set the character set for the mysql db back to latin1? Running alter table on the mysql tables to extend all of the column lengths seems like a bad idea, but seems like what's recommended for other tables in the manual. Also, on a related note, these are really big tables, and running alter table on them to modify the column lengths is taking a LOOONG time. Any hints on speeding this up? -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/[EMAIL PROTECTED]
Query execution times in general query log?
I have a need to find out how long each of the queries executed against a mysql server are taking. I found this post, which indicates that this information can be found in the general query log: http://www.phpbuilder.com/mail/php-general/2002122/0876.php The manual note about it says the binary update log includes execution times for writes only, and if you want timing info for general queries, to use the general query log. However, the output in my general query log (v3.23.54) only has a timestamp, not an execution time. So, a few questions... 1) Has this changed in 4.0? 2) Are there options to get this info put in the log (in 3.23 or otherwise)? 3) Does anybody have a better way to get this info from a running instance (not necessarily in realtime)? -- - Adam - Adam Fields, Managing Partner, [EMAIL PROTECTED] Surgam, Inc. is a technology consulting firm with strong background in delivering scalable and robust enterprise web and IT applications. http://www.adamfields.com - Before posting, please check: http://www.mysql.com/manual.php (the manual) http://lists.mysql.com/ (the list archive) To request this thread, e-mail [EMAIL PROTECTED] To unsubscribe, e-mail [EMAIL PROTECTED] Trouble unsubscribing? Try: http://lists.mysql.com/php/unsubscribe.php
