Thanks! I copied /usr/share/doc/mysql-server-3.23.49/my-huge.cnf into /etc/my.cnf and restarted mysqld from /etc/rc.d/init.d/mysqld
but it's not improving anything. my join query is very simple >select count(B.columnb) from B left join A on B.columnb = A.columna. Both columna and columnb are varchar(11) and indexed. Table B has about 34,000 records and Table A has about 2,500,000 records. The above query took about 3 hours to finish. Something is just not right. Qunfeng Dong --- David Bordas <[EMAIL PROTECTED]> wrote: > > I wish to tune our MySQL Server Parameter to > increase > > the speed of Join. I was trying to do a simple > join > > with two tables. One is big (~2,500,000 records); > the > > other one is small. The current join seems to take > > forever to finish even on the indexed attribute. > > > > I am trying to learn from > > http://www.mysql.com/doc/en/Server_parameters.html > but > > not confident enough to play with our server yet. > Any > > advice will be much appreciated. I am running > > mysql3.23.49 on linux7.3 with 4 GB memory. So I > want > > to try the following from that doc: > > > > shell> safe_mysqld -O key_buffer=64M -O > > table_cache=256 -O sort_buffer=4M -O > > read_buffer_size=1M & > > > > My questions: if I run the above command (as > root), > > should I run it every time when the server starts? > If > > so, how can I set the above option automatically > when > > server starts. Thanks! > > Modify you my.cnf to add or change this parameter > and mysql will "normally" > read this cnf file each time you launch it via > mysql.server script ... > > David > __________________________________________________ Do you Yahoo!? Yahoo! Mail Plus - Powerful. Affordable. Sign up now. http://mailplus.yahoo.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
