key_buffer_size – 128M
key_read_requests – 650759289
key_reads - 79112

Qcache inserts
Qcache hits
Qcache lowmem prunes
Qcache free blocks
Qcache total blocks

query_cache_size = 32M
query_cache_type= 1

sort_buffer_size = 1M
max_connections=120
wait_timeout =120
back_log=100
read_buffer_size = 1M
thread_cache=32
interactive_timeout=120
thread_concurrency = 4

# 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 /var/lib/mysql) 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 = 3306
socket = /tmp/mysql.sock
#socket = /var/lib/mysql/mysql.sock
# Here follows entries for some specific programs


# The MySQL server
[mysqld]
port = 3306
socket = /tmp/mysql.sock
#socket = /var/lib/mysql/mysql.sock
skip-locking
key_buffer = 128M
max_allowed_packet = 1M
table_cache = 256
sort_buffer_size = 1M
net_buffer_length = 16K
myisam_sort_buffer_size = 1M
max_connections=120
#addnew config
wait_timeout =120
back_log=100
read_buffer_size = 1M
thread_cache=32
skip-innodb
skip-bdb
skip-name-resolve
join_buffer_size=512k
query_cache_size = 32M
interactive_timeout=120
long_query_time=10
log_slow_queries= /usr/local/mysql4/logs/slow_query.log
query_cache_type= 1
# Try number of CPU's*2 for thread_concurrency
thread_concurrency = 4


#end new config
# 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=, MASTER_PORT=,
# MASTER_USER=, MASTER_PASSWORD= ;
#
# where you replace , , by quoted strings and
# 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 =
#
# The username the slave will use for authentication when connecting
# to the master - required
#master-user =
#
# The password the slave will authenticate with when connecting to
# the master - required
#master-password =
#
# The port the master is listening on.
# optional - defaults to 3306
#master-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 = /var/lib/mysql/
#innodb_data_file_path = ibdata1:10M:autoextend
#innodb_log_group_home_dir = /var/lib/mysql/
#innodb_log_arch_dir = /var/lib/mysql/
# 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 = 20M
sort_buffer_size = 20M
read_buffer = 2M
write_buffer = 2M


[myisamchk]
key_buffer = 20M
sort_buffer_size = 20M
read_buffer = 2M
write_buffer = 2M


[mysqlhotcopy]
interactive-timeout

[mysqld]
port = 3306
serverid = 1
socket = /tmp/mysql.sock
skip-locking
skip-name-resolve
back_log = 384
key_buffer_size = 256M
max_allowed_packet = 4M
thread_stack = 256K
table_cache = 128K
sort_buffer_size = 6M
read_buffer_size = 4M
join_buffer_size = 8M
myisam_sort_buffer_size = 64M
table_cache = 512
thread_cache_size = 64
query_cache_size = 64M
tmp_table_size = 256M
max_connections = 768
max_connect_errors = 10000000
wait_timeout = 10
thread_concurrency = 8
skip-networking

[mysqld_multi]
mysqld = /usr/local/mysql/bin/mysqld_safe
mysqladmin = /usr/local/mysql/bin/mysqladmin
user = mysql   (用一个帐号来启动所有的mysql服务器,因为是用一相同的帐号。那个么这帐号必须都是每个mysql服务都要用的帐号,最好是管理帐号,下面的口令与相同)
password = mypaswd


[mysqld1]
port      = 3306
socket    = /tmp/mysql.sock1
pid-file=/usr/local/mysql/data1/db-app1.pid
log=/usr/local/mysql/data1/db-app.log
datadir = /usr/local/mysql/data
user = mysql

[mysqld2]
port = 3307
socket = /tmp/mysql.sock2
pid-file = /usr/local/mysql/data2/db-app2.pid
datadir = /usr/local/mysql/data2
log=/usr/local/mysql/data2/db-app.log
user = mysql


[mysqld3]
port            = 3308
socket          = /tmp/mysql.sock3
pid-file = /usr/local/mysql/data3/db-app3.pid3
datadir = /usr/local/mysql/data3
log=/usr/local/mysql/data3/db-app.log
user = mysql

[mysqld4]
port            = 3309
socket          = /tmp/mysql.sock4
pid-file = /usr/local/mysql/data3/db-app4.pid
datadir = /usr/local/mysql/data4
log=/usr/local/mysql/data4/db-app.log
user = mysql

[mysqldump]
quick
max_allowed_packet = 16M

[mysql]
no-auto-rehash


[isamchk]
key_buffer = 128M
sort_buffer_size = 128M
read_buffer = 2M
write_buffer = 2M

[myisamchk]
key_buffer = 128M
sort_buffer_size = 128M
read_buffer = 2M
write_buffer = 2M

[mysqlhotcopy]
interactive-timeout
                                    

set @mycnt = 0;
select (@mycnt := @mycnt + 1) as ROWNUM , othercol from tblname order by othercol;

set @mycnt = 0;
select * from (
    select (@mycnt := @mycnt + 1) as ROWNUM , othercol
     from tblname order by othercol
) as A where othercol=OneKeyID;