Thank you John I have in the meantime fond this to be the case (** someone changed config files without my knowledge it seems as this was setup properly and working**)
Anyhow, in order for the innodb to be active again I need to restart the database, however aftewards I assume the tables will still be MyIsam. In this event I will need to manually alter each table, and I am concerned about the impact of this on the system performance. Regards Machiel -----Original Message----- From: John Daisley <daisleyj...@googlemail.com> To: Machiel Richards <machiel.richa...@gmail.com> Cc: mysql mailing list <mysql@lists.mysql.com> Subject: Re: Changing database tables to different storage engine. Date: Mon, 22 Nov 2010 10:51:23 +0000 I have frequently seen Innodb 'silently' disabled if the innodb_log_file_size is different to the files size on disk (quite common when moving systems about). You wont be able to use innodb until you resolve this either by deleting the log files and restarting mysqld so they get recreated or changing the innodb_log_file_size to match the size of the files on disk. If the Innodb engine is not available then MySQL will use the default (usually MyISAM) storage engine even if Innodb was specified. You can stop this behaviour by setting sql-mode=NO_ENGINE_SUBSTITUTION Regards John On 22 November 2010 10:12, Machiel Richards <machiel.richa...@gmail.com> wrote: Hi All Sorry but things have now changed, and I found the following. The tables was in fact restored as Innodb, however someone seems to have gone and changed something causing innodb to be disabled, this caused the tables to be defaulted back to MyIsam. Should this not rather have just resulted in an error allowing to fix the problem in the first place instead of changing the storage engines? Anyone have some thoughts on the best solution to fix this? I will look into the innodb not working soon. Machiel -----Original Message----- From: Machiel Richards <machi...@rdc.co.za> To: mysql mailing list <mysql@lists.mysql.com> Subject: Changing database tables to different storage engine. Date: Mon, 22 Nov 2010 11:59:03 +0200 Good day all Hope all is well. I have something to ask as someone might have done this as well and may have a good solution on how to fix this. During a database migration this weekend to move a MySQL database from windows to linux, we created a backup and restore of the database. However, form my part I made a mistake by overlooking the fact that the windows database was configured to use default storage engine as Innodb. On the new server, the default was set to MyIsam. This resulted in all the tables being restored to the new system as MyIsam instead of Innodb. In order to fix this, I know you can use alter table to change the storage engine, however I need to know the following: 1. this is a production system and can't afford any downtime or as little performance degration as possible. What is the best way to do this in order to have the least amount of effect on the database and it's performance? Regards Machiel -- John Daisley Certified MySQL 5 Database Administrator Certified MySQL 5 Developer Cognos BI Developer Telephone: +44 (0)7918 621621 Email: john.dais...@butterflysystems.co.uk