I suggest checking out your slow query logs: http://dev.mysql.com/doc/refman/5.0/en/slow-query-log.html
the queries are logged, so going into a client and running an explain on the slow queries should help you out. -Sheeri On 11/21/05, ESV Media GmbH <[EMAIL PROTECTED]> wrote: > Hey, we´ve a site ( PHP ) where several 1.000 are online at the same time. > They´re running many sql statements. > Is there a way to find out which statements take a full table scan to > optimize them ? > We´ve a cpu percentage of nearly 50 % with only 30 Members online. > And i´ve seen that there are some full table scans. > Where can i investigate them ? > > And i need some help with configuring the my.cnf. > Below you´ll find our one. > Which options should i optimize ? We´ve much free memory but our cpu is > working to half of the full capacity... > > uname -a : > > Linux m30s06db.ispgateway.de 2.4.29-grsec #10 SMP Mon Jul 4 14:26:46 > CEST 2005 i686 Intel(R) Pentium(R) 4 CPU 3.00GHz GenuineIntel GNU/Linux > > And thats the my.cnf : > > # Example MySQL config file for medium systems. > # > # This is for a system with little memory (32M - 64M) where MySQL plays > # an important part, or systems up to 128M where MySQL is used together > with > # other programs (such as a web server) > # > # You can copy this file to > # /etc/my.cnf to set global options, > # mysql-data-dir/my.cnf to set server-specific options (in this > # installation this directory is > /kunden/106120_40670/ms_appl/mysql_4.1.10a/var) or > # ~/.my.cnf to set user-specific options. > # > # In this file, you can use all long options that a program supports. > # If you want to know which options a program supports, run the program > # with the "--help" option. > > # The following options will be passed to all MySQL clients > [client] > #password = your_password > port = 3307 > socket = /tmp/mysql.sock > > # Here follows entries for some specific programs > > # The MySQL server > [mysqld] > port = 3307 > socket = /tmp/mysql.sock > skip-locking > key_buffer = 64M > max_allowed_packet = 1M > table_cache = 5M > sort_buffer_size = 1M > net_buffer_length = 8K > read_buffer_size = 1M > read_rnd_buffer_size = 512K > myisam_sort_buffer_size = 16M > record_buffer=1M > log-slow-queries > long_query_time = 3 > > # Don't listen on a TCP/IP port at all. This can be a security enhancement, > # if all processes that need to connect to mysqld run on the same host. > # All interaction with mysqld must be made via Unix sockets or named pipes. > # Note that using this option without enabling named pipes on Windows > # (via the "enable-named-pipe" option) will render mysqld useless! > # > # > #skip-networking > > # Replication Master Server (default) > # binary logging is required for replication > log-bin > > # required unique id between 1 and 232 - 1 > # defaults to 1 if master-host is not set > # but will not function as a master if omitted > server-id = 1 > > # Replication Slave (comment out master section to use this) > # > # To configure this host as a replication slave, you can choose between > # two methods : > # > # 1) Use the CHANGE MASTER TO command (fully described in our manual) - > # the syntax is: > # > # CHANGE MASTER TO MASTER_HOST=<host>, MASTER_PORT=<port>, > # MASTER_USER=<user>, MASTER_PASSWORD=<password> ; > # > # where you replace <host>, <user>, <password> by quoted strings and > # <port> by the master's port number (3306 by default). > # > # Example: > # > # CHANGE MASTER TO MASTER_HOST='125.564.12.1', MASTER_PORT=3306, > # MASTER_USER='joe', MASTER_PASSWORD='secret'; > # > # OR > # > # 2) Set the variables below. However, in case you choose this method, then > # start replication for the first time (even unsuccessfully, for example > # if you mistyped the password in master-password and the slave fails to > # connect), the slave will create a master.info file, and any later > # change in this file to the variables' values below will be ignored and > # overridden by the content of the master.info file, unless you shutdown > # the slave server, delete master.info and restart the slaver server. > # For that reason, you may want to leave the lines below untouched > # (commented) and instead use CHANGE MASTER TO (see above) > # > # required unique id between 2 and 232 - 1 > # (and different from the master) > # defaults to 2 if master-host is set > # but will not function as a slave if omitted > #server-id = 2 > # > # The replication master for this slave - required > #master-host = <hostname> > # > # The username the slave will use for authentication when connecting > # to the master - required > #master-user = <username> > # > # The password the slave will authenticate with when connecting to > # the master - required > #master-password = <password> > # > # The port the master is listening on. > # optional - defaults to 3306 > #master-port = <port> > # > # binary logging - not required for slaves, but recommended > #log-bin > > # Point the following paths to different dedicated disks > #tmpdir = /tmp/ > #log-update = /path-to-dedicated-directory/hostname > > # Uncomment the following if you are using BDB tables > #bdb_cache_size = 4M > #bdb_max_lock = 10000 > > # Uncomment the following if you are using InnoDB tables > #innodb_data_home_dir = /kunden/106120_40670/ms_appl/mysql_4.1.10a/var/ > #innodb_data_file_path = ibdata1:10M:autoextend > #innodb_log_group_home_dir = > /kunden/106120_40670/ms_appl/mysql_4.1.10a/var/ > #innodb_log_arch_dir = /kunden/106120_40670/ms_appl/mysql_4.1.10a/var/ > # You can set .._buffer_pool_size up to 50 - 80 % > # of RAM but beware of setting memory usage too high > #innodb_buffer_pool_size = 16M > #innodb_additional_mem_pool_size = 2M > # Set .._log_file_size to 25 % of buffer pool size > #innodb_log_file_size = 5M > #innodb_log_buffer_size = 8M > #innodb_flush_log_at_trx_commit = 1 > #innodb_lock_wait_timeout = 50 > > [mysqldump] > quick > max_allowed_packet = 16M > > [mysql] > no-auto-rehash > # Remove the next comment character if you are not familiar with SQL > #safe-updates > > [isamchk] > key_buffer = 25M > sort_buffer_size = 25M > read_buffer = 6M > write_buffer = 6M > > [myisamchk] > key_buffer = 25M > sort_buffer_size = 25M > read_buffer = 6M > write_buffer = 6M > > [mysqlhotcopy] > interactive-timeout > > -- > 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]
