Need Perfomance / Tuning Help
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 ? And i need some help with configuring the my.cnf. Below you´ll find our one. Which options should i optimize ? 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 2^32 - 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 2^32 - 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 = 1 # 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
Re: Need Perfomance / Tuning Help
Hello. Is there a way to find out which statements take a full table scan to optimize them ? See: http://dev.mysql.com/doc/refman/5.0/en/slow-query-log.html Marco Schierhorn 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 ? And i need some help with configuring the my.cnf. Below you´ll find our one. Which options should i optimize ? 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 2^32 - 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 2^32 - 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 = 1 # Uncomment the following if you are using InnoDB tables #innodb_data_home_dir =
Perfomance Tuning
I have just installed redhat linux 9 which ships with mysql 3.23.56. Mysql has to be setup so that it can use innodb tables, and data inserts (blobs) should be able to handle at least 8M at a time. The machine has two P III 933MHz CPU's, 1.128G RAM (512M*2 + 128M), and a 36 Gig hd with 1 Gig swap and 3 equal size ext3 partitions. What would be the recomended setup for good performance considering that the db will have about 15 users for 9 hours in a day, and about 10 or so users throughout the day who wont be conistenly using the db. My configuration looks like this so far: /etc/mysql.cnf [mysqld] datadir=/var/lib/mysql socket=/var/lib/mysql/mysql.sock max_allowed_packet=16M #InnoDB innodb_data_file_path = ibdata/ibdata1:2000M:autoextend innodb_data_home_dir = /var/lib/mysql [mysql.server] user=mysql basedir=/var/lib [safe_mysqld] err-log=/var/log/mysqld.log pid-file=/var/run/mysqld/mysqld.pid /etc/mysql.cnf -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/[EMAIL PROTECTED]
