Keep in mind that Linux will allocate nearly all of its free RAM to the buffer cache as the kernel opens and reads files to increase filesystem performance (cat /proc/meminfo and look at the "buffers" row) So, lack of free RAM may not mean what you think it means.
As for the "too many connections" issues, take a look at the connections table (mysqladmin proc, or show processlist from the mysql command prompt). You may need to raise the connection limit even further. --Michael > -----Original Message----- > From: Kayra Otaner [mailto:[EMAIL PROTECTED] > Sent: Wednesday, August 20, 2003 3:57 PM > To: [EMAIL PROTECTED] > 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/mysql?> [EMAIL PROTECTED] > > -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe: http://lists.mysql.com/[EMAIL PROTECTED]
