MySQL配置文件my.cnf 优化

select sleep(1);
select sleep(3);
select * from t1;

mysql> show variables like '%innodb_file_per_table%'; 
+-----------------------+-------+
| Variable_name         | Value |
+-----------------------+-------+
| innodb_file_per_table | OFF   |
+-----------------------+-------+
1 row in set (0.00 sec)

[mysqld]
port            = 3306
datadir         = /db/mysql/
socket          = /db/mysql/mysql.sock
skip-locking
skip-name-resolve
key_buffer = 1024M
max_allowed_packet = 1M
max_heap_table_size=256M
tmp_table_size=256M
sort_buffer_size = 8M
join_buffer_size=8M
net_buffer_length = 8K
read_buffer_size = 2M
read_rnd_buffer_size = 8M
bulk_insert_buffer_size=64M
myisam_sort_buffer_size = 64M
skip-character-set-client-handshake
init-connect='SET NAMES utf8'
default-character-set=utf8
#innodb_force_recovery = 6
#log=general-log
log-slow-queries=slow-log
long_query_time=1
#query cache config
query_cache_size = 128M
query_cache_type = 1
thread_cache_size = 64
thread_concurrency=32
#max_connnection config current values=800 add by Allen
max_connections = 1200
table_open_cache=1024
#back_log config add by kevin sun
back_log=500
#record_buffer add by kevin sun
record_buffer=16M
#bootstrap
init_file=/mysqlinit/bootstrap._sql
#owner table space
innodb_file_per_table

# 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=mysql-bin
# required unique id between 1 and 2^32 - 1
# defaults to 1 if master-host is not set
# but will not 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 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=mysql-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 InnoDB tables
innodb_status_file = 0
innodb_data_home_dir = /db/mysql/
innodb_data_file_path = ibdata1:10M:autoextend
innodb_log_group_home_dir = /db/mysql/
#innodb_log_arch_dir = /db/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 = 3G
innodb_additional_mem_pool_size = 16M
# Set .._log_file_size to 25 % of buffer pool size
innodb_log_file_size = 256M
innodb_log_buffer_size = 32M
innodb_flush_log_at_trx_commit = 2
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 = 512M
sort_buffer_size = 20M
read_buffer = 2M
write_buffer = 2M
[myisamchk]
key_buffer = 512M
sort_buffer_size = 20M
read_buffer = 2M
write_buffer = 2M
[mysqlhotcopy]
interactive-timeout