I would run the DB on a RAMDisk http://www.ibiblio.org/mdw/linuxfocus/English/November1999/article124.html Anyone else? Martin ----- Original Message ----- From: "Kayra Otaner" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Wednesday, August 20, 2003 3:56 PM Subject: MySQL 4.0.13 Memory problem under heavy load
> Hi all, > > I want to get your opinions on how to increase available/free memory and > performance on a heavy volume database server. > > I have MySQL 4.0.13 running on RH 7.2 replicated to another RH 7.2 using > same MySQL version. > Recently our master database server (2 AMD Cpu + 2Gb memory + 2Gb swap > space) started to suffer from memory outages because of heavy load. > During day available free memory is changing from 200Mb to 5Mb and when > available memory reaches to 5Mb MySQL starts to give 'Too many > connections' messages. Db server is working with 45-70 query/second and > more than 25,712 connection per hour. There are active 10-13 threads > serving databases. > > To increase available free memory I've did the following : > 1- Optimized all tables > 2- Removed unneccessary/old indexes > 3- Moved unused databases to replication server > 4- Increased key_buffer_size from 8Mb to 128Mb > 5- Have increased max_connection from 100 to 150 > 6- Have increased thread_cache to 5 > > This changes helped a bit but still memory is a problem for MySQL. What > should I do to prevent 'too many connections' messages and have more > memory available on database servers? Should I remove more indexes from > tables? Should I increase key_buffer_size to 256Mb or more? > Key_buffer_size doesn't look like a problem since key efficiency looks > 100% most of the time. > > > Thank you for your time > > Kayra Otaner > > > -- > MySQL General Mailing List > For list archives: http://lists.mysql.com/mysql > To unsubscribe: http://lists.mysql.com/[EMAIL PROTECTED] > > -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe: http://lists.mysql.com/[EMAIL PROTECTED]
