mysql的my.ini文件详解

# MySQL Server Instance Configuration File  
# ----------------------------------------------------------------------  
# Generated by the MySQL Server Instance Configuration Wizard  
#  
#  
# Installation Instructions  
# ----------------------------------------------------------------------  
#  
# On Linux you can copy this file to /etc/my.cnf to set global options,  
# mysql-data-dir/my.cnf to set server-specific options  
# (@localstatedir@ for this installation) or to  
# ~/.my.cnf to set user-specific options.  
#  
# On Windows you should keep this file in the installation directory   
# of your server (e.g. C:Program FilesMySQLMySQL Server 4.1). To  
# make sure the server reads the config file use the startup option   
# "--defaults-file".   
#  
# To run run the server from the command line, execute this in a   
# command line shell, e.g.  
# mysqld --defaults-file="C:Program FilesMySQLMySQL Server 4.1my.ini"  
#  
# To install the server as a Windows service manually, execute this in a   
# command line shell, e.g.  
# mysqld --install MySQL41 --defaults-file="C:Program FilesMySQLMySQL Server 4.1my.ini"  
#  
# And then execute this in a command line shell to start the server, e.g.  
# net start MySQL41  
#  
#  
# Guildlines for editing this file  
# ----------------------------------------------------------------------  
#  
# In this file, you can use all long options that the program supports.  
# If you want to know the options a program supports, start the program  
# with the "--help" option.  
#  
# More detailed information about the individual options can also be  
# found in the manual.  
#  
#  
# CLIENT SECTION  
# ----------------------------------------------------------------------  
#  
# The following options will be read by MySQL client applications.  
# Note that only client applications shipped by MySQL are guaranteed  
# to read this section. If you want your own MySQL client program to  
# honor these values, you need to specify it as an option during the  
# MySQL client library initialization.  
#  
[client]  
  
port=3306  
  
[mysql]  
  
default-character-set=gbk  
  
  
# SERVER SECTION  
# ----------------------------------------------------------------------  
#  
# The following options will be read by the MySQL Server. Make sure that  
# you have installed the server correctly (see above) so it reads this   
# file.  
#  
[mysqld]  
  
# The TCP/IP Port the MySQL Server will listen on  
port=3306  
  
  
#Path to installation directory. All paths are usually resolved relative to this.  
basedir="D:/MySQL Server 5.0/"  
  
#Path to the database root  
datadir="D:/MySQL Server 5.0/Data/"  
  
# The default character set that will be used when a new schema or table is  
# created and no character set is defined  
default-character-set=gbk  
  
# The default storage engine that will be used when create new tables when  
default-storage-engine=INNODB  
  
# Set the SQL mode to strict  
sql-mode="STRICT_TRANS_TABLES,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION"  
  
# The maximum amount of concurrent sessions the MySQL server will  
# allow. One of these connections will be reserved for a user with  
# SUPER privileges to allow the administrator to login even if the  
# connection limit has been reached.  
max_connections=100  
  
# Query cache is used to cache SELECT results and later return them  
# without actual executing the same query once again. Having the query  
# cache enabled may result in significant speed improvements, if your  
# have a lot of identical queries and rarely changing tables. See the  
# "Qcache_lowmem_prunes" status variable to check if the current value  
# is high enough for your load.  
# Note: In case your tables change very often or if your queries are  
# textually different every time, the query cache may result in a  
# slowdown instead of a performance improvement.  
query_cache_size=14M  
  
# The number of open tables for all threads. Increasing this value  
# increases the number of file descriptors that mysqld requires.  
# Therefore you have to make sure to set the amount of open files  
# allowed to at least 4096 in the variable "open-files-limit" in  
# section [mysqld_safe]  
table_cache=256  
  
# Maximum size for internal (in-memory) temporary tables. If a table  
# grows larger than this value, it is automatically converted to disk  
# based table This limitation is for a single table. There can be many  
# of them.  
tmp_table_size=17M  
  
  
# How many threads we should keep in a cache for reuse. When a client  
# disconnects, the client's threads are put in the cache if there aren't  
# more than thread_cache_size threads from before.  This greatly reduces  
# the amount of thread creations needed if you have a lot of new  
# connections. (Normally this doesn't give a notable performance  
# improvement if you have a good thread implementation.)  
thread_cache_size=8  
  
#*** MyISAM Specific options  
  
# The maximum size of the temporary file MySQL is allowed to use while  
# recreating the index (during REPAIR, ALTER TABLE or LOAD DATA INFILE.  
# If the file-size would be bigger than this, the index will be created  
# through the key cache (which is slower).  
myisam_max_sort_file_size=100G  
  
# If the temporary file used for fast index creation would be bigger  
# than using the key cache by the amount specified here, then prefer the  
# key cache method.  This is mainly used to force long character keys in  
# large tables to use the slower key cache method to create the index.  
myisam_max_extra_sort_file_size=100G  
  
# If the temporary file used for fast index creation would be bigger  
# than using the key cache by the amount specified here, then prefer the  
# key cache method.  This is mainly used to force long character keys in  
# large tables to use the slower key cache method to create the index.  
myisam_sort_buffer_size=33M  
  
# Size of the Key Buffer, used to cache index blocks for MyISAM tables.  
# Do not set it larger than 30% of your available memory, as some memory  
# is also required by the OS to cache rows. Even if you're not using  
# MyISAM tables, you should still set it to 8-64M as it will also be  
# used for internal temporary disk tables.  
key_buffer_size=22M  
  
# Size of the buffer used for doing full table scans of MyISAM tables.  
# Allocated per thread, if a full scan is needed.  
read_buffer_size=64K  
read_rnd_buffer_size=256K  
  
# This buffer is allocated when MySQL needs to rebuild the index in  
# REPAIR, OPTIMZE, ALTER table statements as well as in LOAD DATA INFILE  
# into an empty table. It is allocated per thread so be careful with  
# large settings.  
sort_buffer_size=256K  
  
  
#*** INNODB Specific options ***  
  
  
# Use this option if you have a MySQL server with InnoDB support enabled  
# but you do not plan to use it. This will save memory and disk space  
# and speed up some things.  
#skip-innodb  
  
# Additional memory pool that is used by InnoDB to store metadata  
# information.  If InnoDB requires more memory for this purpose it will  
# start to allocate it from the OS.  As this is fast enough on most  
# recent operating systems, you normally do not need to change this  
# value. SHOW INNODB STATUS will display the current amount used.  
innodb_additional_mem_pool_size=2M  
  
# If set to 1, InnoDB will flush (fsync) the transaction logs to the  
# disk at each commit, which offers full ACID behavior. If you are  
# willing to compromise this safety, and you are running small  
# transactions, you may set this to 0 or 2 to reduce disk I/O to the  
# logs. Value 0 means that the log is only written to the log file and  
# the log file flushed to disk approximately once per second. Value 2  
# means the log is written to the log file at each commit, but the log  
# file is only flushed to disk approximately once per second.  
innodb_flush_log_at_trx_commit=1  
  
# The size of the buffer InnoDB uses for buffering log data. As soon as  
# it is full, InnoDB will have to flush it to disk. As it is flushed  
# once per second anyway, it does not make sense to have it very large  
# (even with long transactions).  
innodb_log_buffer_size=1M  
  
# InnoDB, unlike MyISAM, uses a buffer pool to cache both indexes and  
# row data. The bigger you set this the less disk I/O is needed to  
# access data in tables. On a dedicated database server you may set this  
# parameter up to 80% of the machine physical memory size. Do not set it  
# too large, though, because competition of the physical memory may  
# cause paging in the operating system.  Note that on 32bit systems you  
# might be limited to 2-3.5G of user level memory per process, so do not  
# set it too high.  
innodb_buffer_pool_size=40M  
  
# Size of each log file in a log group. You should set the combined size  
# of log files to about 25%-100% of your buffer pool size to avoid  
# unneeded buffer pool flush activity on log file overwrite. However,  
# note that a larger logfile size will increase the time needed for the  
# recovery process.  
innodb_log_file_size=10M  
  
# Number of threads allowed inside the InnoDB kernel. The optimal value  
# depends highly on the application, hardware as well as the OS  
# scheduler properties. A too high value may lead to thread thrashing.  
innodb_thread_concurrency=10