MySQL配置文件my.ini的使用解读

my.ini 是啥玩意？

my.ini是MySQL数据库中使用的配置文件，修改这个文件可以达到更新配置的目的。

my.ini 在哪放着呢？

my.ini存放在MySql安装的根目录，如图所示：（我比较懒，用的WAMP，大家找自己的安装目录即可）

my.ini的配置内容介绍

其实大体可以分为两部分：客户端的参数、服务器参数。

其中服务器参数里还包括 InnoDB存储引擎参数。

客户端的参数

下面显示的是客户端的参数，[client]和[mysql]都是客户端，下面是参数简介：

port参数表示的是MySQL数据库的端口，默认的端口是3306，如果你需要更改端口号的话，就可以通过在这里修改。
default-character-set参数是客户端默认的字符集，如果你希望它支持中文，可以设置成gbk或者utf8。
这里还有一个password参数，在这里设置了password参数的值就可以在登陆时不用输入密码直接进入

 
# 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=
 
[mysql]
 
default-character-set=gb

服务器断参数

以下是参数的介绍：

port参数也是表示数据库的端口。
basedir参数表示MySQL的安装路径。
datadir参数表示MySQL数据文件的存储位置，也是数据库表的存放位置。
default-character-set参数表示默认的字符集，这个字符集是服务器端的。
default-storage-engine参数默认的存储引擎。
这里有两个引擎 MyISAM 和 InnoDB ，用什么看你需求，详细介绍可以参考下面这篇文章：https://www.jb51.net/article/270995.htm
sql-mode参数表示SQL模式的参数，通过这个参数可以设置检验SQL语句的严格程度。
max_connections参数表示允许同时访问MySQL服务器的最大连接数，其中一个连接是保留的，留给管理员专用的。
query_cache_size参数表示查询时的缓存大小，缓存中可以存储以前通过select语句查询过的信息，再次查询时就可以直接从缓存中拿出信息。
table_cache参数表示所有进程打开表的总数。
tmp_table_size参数表示内存中临时表的总数。
thread_cache_size参数表示保留客户端线程的缓存。
myisam_max_sort_file_size参数表示MySQL重建索引时所允许的最大临时文件的大小。
myisam_sort_buffer_size参数表示重建索引时的缓存大小。
key_buffer_size参数表示关键词的缓存大小。
read_buffer_size参数表示MyISAM表全表扫描的缓存大小。
read_rnd_buffer_size参数表示将排序好的数据存入该缓存中。
sort_buffer_size参数表示用于排序的缓存大小

 
# 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=
 
 
#Path to installation directory. All paths are usually resolved relative to this.
basedir="E:/Java/Mysql/"
 
#Path to the database root
datadir="C:/ProgramData/MySQL/MySQL Server.5/Data/"
 
# The default character set that will be used when a new schema or table is
# created and no character set is defined
character-set-server=gb
 
# 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=
 
# 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=
 
# 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 in the variable "open-files-limit" in
# section [mysqld_safe]
table_cache=
 
# 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=M
 
 
# 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=
 
#*** 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=G
 
# 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=M
 
# Size of the Key Buffer, used to cache index blocks for MyISAM tables.
# Do not set it larger than% 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-64M as it will also be
# used for internal temporary disk tables.
key_buffer_size=M
 
# 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=K
read_rnd_buffer_size=K
 
# 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=K

InnoDB存储引擎使用的参数：

以下是参数的简介：

innodb_additional_mem_pool_size参数表示附加的内存池，用来存储InnoDB表的内容。
innodb_flush_log_at_trx_commit参数是设置提交日志的时机，若设置为1，InnoDB会在每次提交后将事务日志写到磁盘上。
innodb_log_buffer_size参数表示用来存储日志数据的缓存区的大小。
innodb_buffer_pool_size参数表示缓存的大小，InnoDB使用一个缓冲池类保存索引和原始数据。
innodb_log_file_size参数表示日志文件的大小。
innodb_thread_concurrency参数表示在InnoDB存储引擎允许的线程最大数。

 
#*** 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=M
 
# If set to, 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 or 2 to reduce disk I/O to the
# logs. Value means that the log is only written to the log file and
# the log file flushed to disk approximately once per second. Value
# 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=
 
# 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=M
 
# 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% 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 onbit systems you
# might be limited to-3.5G of user level memory per process, so do not
# set it too high.
innodb_buffer_pool_size=M
 
# Size of each log file in a log group. You should set the combined size
# of log files to about%-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=M
 
# 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=

中文翻译版 my.ini

 
[client]  
port=  
 
[mysql]  
default-character-set=gbk  
 
[mysqld]
port =
socket = /tmp/mysql.sock
# 设置mysql的安装目录
basedir=F:\\Hzq Soft\\MySql ServerGA
# 设置mysql数据库的数据的存放目录，必须是data，或者是\\xxx-data
datadir=F:\\Hzq Soft\\MySql ServerGA\\data
#innodb_log_arch_dir 默认datadir
#innodb_log_group_home_dir  默认datadir
# 设置mysql服务器的字符集，默认编码
default-character-set=utf
 
#连接数的操作系统监听队列数量，如果经常出现“拒绝连接”错误可适当增加此值
back_log =
#不使用接听TCP / IP端口方法，mysqld通过命名管道连接
#skip-networking
# 最大连接数量
max_connections =
#打开表的线程数量限定，最大，除非用mysqld_safe打开限制
table_open_cache =
#MySql 服务接收针对每个进程最大查询包大小
max_allowed_packet =M
#作用于SQL查询单笔处理使用的内存缓存，如果一笔操作的二进制数据超过了限定大小，将会在磁盘上开辟空间处理，一般设为-2M即可，默认1M
binlog_cache_size =M
#单个内存表的最大值限定
max_heap_table_size =M
#为每个线程分配的排序缓冲大小
sort_buffer_size =M
#join 连表操作的缓冲大小,根据实际业务来设置，默认M
join_buffer_size =M
#操作多少个离开连接的线程的缓存
thread_cache_size =
#并发线程数量，默认为，可适当增加到2倍以内。如果有多个CPU可以乘 上CPU的数量。双核CPU可以乘 上当前最核数再乘 上70%-85%
thread_concurrency =
#专用于具体SQL的缓存，如果提交的查询与几次中的某查询相同，并且在query缓存中存在，则直接返回缓存中的结果。
query_cache_size =M
#对应上一条设置，当查询的结果超过下面设置的大小时，将不会趣入到上面设置的缓存区中，避免了一个大的结果占据大量缓存。
query_cache_limit =M
#设置加全文检索中的最小单词长度。
#ft_min_word_len =
#CREATE TABLE 语句的默认表类型，如果不自己指定类型，则使用下行的类型
default-storage-engine = InnoDB
#线程堆栈大小，mysql说它自己用的堆栈大小不超过K。这个值可适当设高一点（在RCA的项目中都是共用同一个数据库连接的），默认192K
thread_stack =K
#设置事务处理的级别,默认 REPEATABLE-READ，一般用它就即可，以下二行按顺序对应，
#可读写未提交的数据，创建未提交的数据副本读写，未提交之前可读不可写，只允许串行序列招行事务。
# READ-UNCOMMITTED, READ-COMMITTED, REPEATABLE-READ, SERIALIZABLE
transaction_isolation = REPEATABLE-READ
#单一内存临时表在内存中的大小，超过此值自动转换到磁盘操作
tmp_table_size =M
#启动二进制日志功能，可通过它实现时间点恢复最新的备份
#log-bin=mysql-bin
#二进制日志格式，对就上一条，-建议混合格式
#binlog_format=mixed
#转换查询为缓慢查询
slow_query_log
#对应上一条，如果一个查询超过了下条设定的时间则执行上一条。
long_query_time =
#自定义主机ID识别符，用于主从或多服务器之间识别，为 一个 int 类型
server-id =
#一般用来缓存MyISAM表的主键，也用于临时的磁盘表缓存主键，上面多次出现临时磁盘表，所以就算不用MyISAM也最好为其设置一个不小的值，默认M
key_buffer_size =M
#全表扫描MyISAM表时的缓存，每个线程拥有下行的大小。
read_buffer_size =M
#排序操作时与磁盘之间的缓存，分到每个线程，默认M
read_rnd_buffer_size =M
#MyISAM使用特殊树形进行批量插入时的缓存，如insert ... values(..)(..)(..)
bulk_insert_buffer_size =M
#MyISAM索引文件的最大限定，
myisam_max_sort_file_size =G
#如果一个myisam表有一个以上的索引， MyISAM可以使用一个以上线程来排序并行它们。较耗硬件资源，如果你的环境不错，可以增加此值。
myisam_repair_threads =
#自动检查和修复无法正确关闭MyISAM表。
myisam_recover
# *** INNODB Specific options ***
#开启下条将会禁用 INNODB
#skip-innodb
#一般不用设置或者说设了也没多大用，InnoDB会自己与操作系统交互管理其附加内存池所使用InnoDB的存储数据的大小
innodb_additional_mem_pool_size =M
#innodb整体缓冲池大小，不宜过大，设为本地内存的%-75% 比较合适,在本机开发过程中可以设得较小一点如 64M,256M
innodb_buffer_pool_size =M
#InnoDB的数据存储在一个或多个数据文件组成的表空间
innodb_data_file_path = ibdata:10M:autoextend
#用于异步IO操作的线程数量，默认为 ，可适当提高
innodb_file_io_threads =
#线程数内允许的InnoDB内核,不宜太高
innodb_thread_concurrency =
#InnoDB的事务日志快存行为,默认为，为0可减轻磁盘I/0操作，还有以为2
innodb_flush_log_at_trx_commit =
#InnoDB的用于的缓冲日志数据的大小
innodb_log_buffer_size =M
#日志文件，可设置为%-90%的总体缓存大小，默认 256M. 修改此项要先删除datadir\ib_logfileXXX
innodb_log_file_size =M
#日志组数量，默认为
innodb_log_files_in_group =
#InnoDB的日志文件位置。默认是MySQL的datadir
#innodb_log_group_home_dir
#InnoDB最大允许的脏页缓冲池的百分比，默认
innodb_max_dirty_pages_pct =
#事务死锁超时设定
innodb_lock_wait_timeout =
 
[client]
port =
socket = /tmp/mysql.sock
# 设置mysql客户端的字符集
default-character-set=utf
 
[mysqldump]
quick
max_allowed_packet =M
 
[mysql]
no-auto-rehash
 
# Only allow UPDATEs and DELETEs that use keys.
#safe-updates
 
[WinMySQLAdmin]
# 指定mysql服务启动启动的文件
Server=F:\\myweb\\MySql Server\\bin\\mysqld.exe

	# 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=

	[mysql]

	default-character-set=gb

	# 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=


	#Path to installation directory. All paths are usually resolved relative to this.
	basedir="E:/Java/Mysql/"

	#Path to the database root
	datadir="C:/ProgramData/MySQL/MySQL Server.5/Data/"

	# The default character set that will be used when a new schema or table is
	# created and no character set is defined
	character-set-server=gb

	# 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=

	# 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=

	# 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 in the variable "open-files-limit" in
	# section [mysqld_safe]
	table_cache=

	# 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=M


	# 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=

	#*** 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=G

	# 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=M

	# Size of the Key Buffer, used to cache index blocks for MyISAM tables.
	# Do not set it larger than% 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-64M as it will also be
	# used for internal temporary disk tables.
	key_buffer_size=M

	# 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=K
	read_rnd_buffer_size=K

	# 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=K

	#* 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=M

	# If set to, 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 or 2 to reduce disk I/O to the
	# logs. Value means that the log is only written to the log file and
	# the log file flushed to disk approximately once per second. Value
	# 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=

	# 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=M

	# 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% 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 onbit systems you
	# might be limited to-3.5G of user level memory per process, so do not
	# set it too high.
	innodb_buffer_pool_size=M

	# Size of each log file in a log group. You should set the combined size
	# of log files to about%-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=M

	# 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=