mysql分组提交和实时fsync_MySQL

　　Group commit and real fsync

　　分组提交和实时fsync

　　During the recent months I’ve seen few cases of customers upgrading to MySQL 5.0 and having serious performance slow downs, up to 10 times in certain cases. What was the most surprising for them is the problem was hardware and even OS specific - it could show up with one OS version but not in the other. Even more interesting performance may be dramatically affected by