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

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# 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 =gb2312

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：http://www.tuohang.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

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# 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= "E:/Java/Mysql/"   #Path to the database root datadir= "C:/ProgramData/MySQL/MySQL Server 5.5/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=gb2312   # 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=0   # 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=35M     # 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_sort_buffer_size=69M   # 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=55M   # 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。

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#*** 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=3M   # 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=2M   # 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=107M   # 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=54M   # 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=18

中文翻译版 my.ini

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[client]  port=3306    [mysql]  default - character - set =gbk    [mysqld] port = 3306 socket = /tmp/mysql.sock # 设置mysql的安装目录 basedir=F:\\Hzq Soft\\MySql Server 51GA # 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 Server 51GA\\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 =utf8   #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 = 50 #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 = 90 #打开表的线程数量限定，最大4096，除非用mysqld_safe打开限制 table_open_cache = 2048 #MySql 服务接收针对每个进程最大查询包大小 max_allowed_packet = 16M #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 1-2M即可，默认1M binlog_cache_size = 2M #单个内存表的最大值限定 max_heap_table_size = 64M #为每个线程分配的排序缓冲大小 sort_buffer_size = 8M # join 连表操作的缓冲大小,根据实际业务来设置，默认8M join_buffer_size = 32M #操作多少个离开连接的线程的缓存 thread_cache_size = 8 #并发线程数量，默认为8，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 = 16 #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 = 64M #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 = 2M #设置加全文检索中的最小单词长度。 #ft_min_word_len = 4 # 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64K。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 = 800K #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 = 64M #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 = 2 #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 = 1 #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32M key_buffer_size = 56M #全表扫描MyISAM表时的缓存，每个线程拥有下行的大小。 read_buffer_size = 2M #排序操作时与磁盘之间的缓存，分到每个线程，默认16M read_rnd_buffer_size = 16M #MyISAM使用特殊树形进行批量插入时的缓存，如 insert ... values (..)(..)(..) bulk_insert_buffer_size = 64M #MyISAM索引文件的最大限定， myisam_max_sort_file_size = 12G #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 = 2 #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 = 16M #innodb整体缓冲池大小，不宜过大，设为本地内存的 50%-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 = 256M #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 = ibdata1:10M:autoextend #用于异步IO操作的线程数量，默认为 4 ，可适当提高 innodb_file_io_threads = 8 #线程数内允许的InnoDB内核,不宜太高 innodb_thread_concurrency = 14 #InnoDB的事务日志快存行为,默认为 1，为0可减轻磁盘I/0操作，还有以为2 innodb_flush_log_at_trx_commit = 1 #InnoDB的用于的缓冲日志数据的大小 innodb_log_buffer_size = 16M #日志文件，可设置为25%-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 = 256M #日志组数量，默认为3 innodb_log_files_in_group = 3 #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90 innodb_max_dirty_pages_pct = 90 #事务死锁超时设定 innodb_lock_wait_timeout = 120   [client] port = 3306 socket = /tmp/mysql.sock # 设置mysql客户端的字符集 default - character - set =utf8   [mysqldump] quick max_allowed_packet = 16M   [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

总结

以上为个人经验，希望能给大家一个参考，也希望大家多多支持服务器之家。

原文链接：https://blog.csdn.net/weixin_45525272/article/details/117212336