2009/9/13 Dan Nelson <dnel...@allantgroup.com> > In the last episode (Sep 12), Arthur Meeks Meeks said: > > I have a database with about 1000 tables and 150GB. I have done a simple > > "for f in $(cat tables); do mysql -uuser -ppassword database_name -e > > "alter table $f engine=InnoDB;" ; done > > > > I took about 3 hours and everything went fine, but I just realised that > > the same database in another server in myisam is about 150GB and in the > > server where I converted it to innodb it's about 350GB. > > > > Is that normal? > > Yes; innodb tables will require quite a bit more space than myisam, because > the table data itself is stored as an index (which means each page will be > between 50% and 94% full), and because each row needs extra space to hold > transaction and locking info. > > http://dev.mysql.com/doc/refman/5.1/en/dynamic-format.html > > http://dev.mysql.com/doc/refman/5.1/en/innodb-physical-structure.html > http://dev.mysql.com/doc/refman/5.1/en/innodb-physical-record.html
Thanks a lot Dan, now it makes sense. A
