Dear all, i am nowing having a problem with the mysql server optimization, i have 20 database on a server,each database is about 80Gb,the sql seems very slow,almost > 5s.and the server i/o is so high,when i check the processlist,the 'copying to tmp table' state takes a long time.
i have already use index,but the sql use lots of 'and','or','order by', and for some reason i can not optimization the sql,i hope to do some optimization on mysql server to mitigate this phenomenon，could any one give me some suggestion? thanks. my server is linux,8CPU and 4G memery,the my.cnf is: [mysqld] port = 3306 skip-locking skip-name-resolve key_buffer_size = 16M max_allowed_packet = 1M table_open_cache = 64 sort_buffer_size = 512M net_buffer_length = 8K read_buffer_size = 512K read_rnd_buffer_size = 512M myisam_sort_buffer_size = 8M table_cache = 1024 log-bin=mysql-bin binlog_format=mixed -- Tianjing
