mysql配置文件my.ini的分析
2012-08-17 22:38
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每天积累一点,菜鸟总得长翅膀的!
这里说的mysql的配置文件是windows下面的。我的版本是5.6,so,如果和你的my.ini有出入,我say sorry。
好!
my.ini咋看起来很震惊人,但是它的注释实在是为我们解决了所有的问题了。《mysql性能调优与架构设计》里面都出现了my.ini里面的英文的译文,所以注释是很好的东西。我们看my.ini里面踢出注释,还剩下以下内容:
可以看到,整个文件被[client],[mysql],[mysqld]分成了三部分,所以明白这三部分对应着什么更加重要。
1.[client]下面对应的参数是给客户端读取的,上面的配置文件中,port=3306的设置就是给客户端读取的。
2.[mysql]下面对应的参数是给客户端软件读取的;这里我们默认使用了名称为mysql的客户端,所有这个段,假设我们使用自己写的客户端名称是newMySQL,那么my.ini里面应该有[newMySQL]段;
所以可以说:[client]下面的参数是所有mysql客户端都可以读取的参数,[mysql]是名称为mysql的客户端可以读取的参数;
3.[mysqld]下面对应的参数是最多的,这里面的参数是mysql服务器使用的,例如要改变新建的数据库的默认字符集,可以将[mysqld]字段下面的default-character-set设置为utf8,即default-character-set=utf8。注意了,[mysql]里面也有这个参数的设置哦,所以请区别好段。
好,理解了上面对三个中括号段的说明,我们应该在哪里设置就很明确了,同时为什么在那里设置也就很好回答了。至于参数的含义就不说了,注释很清楚。
这里说的mysql的配置文件是windows下面的。我的版本是5.6,so,如果和你的my.ini有出入,我say sorry。
好!
my.ini咋看起来很震惊人,但是它的注释实在是为我们解决了所有的问题了。《mysql性能调优与架构设计》里面都出现了my.ini里面的英文的译文,所以注释是很好的东西。我们看my.ini里面踢出注释,还剩下以下内容:
[client] port=3306 [mysql] default-character-set=latin1 [mysqld] # The TCP/IP Port the MySQL Server will listen on port=3306 log-error=c:\error.log #Path to installation directory. All paths are usually resolved relative to this. basedir="C:/Program Files/MySQL/MySQL Server 5.0/" #Path to the database root datadir="C:/Program Files/MySQL/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=utf8 # 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=15M # 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=30M # 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=20M # 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=8 log-error=c:\err.log log=c:\log.log
可以看到,整个文件被[client],[mysql],[mysqld]分成了三部分,所以明白这三部分对应着什么更加重要。
1.[client]下面对应的参数是给客户端读取的,上面的配置文件中,port=3306的设置就是给客户端读取的。
2.[mysql]下面对应的参数是给客户端软件读取的;这里我们默认使用了名称为mysql的客户端,所有这个段,假设我们使用自己写的客户端名称是newMySQL,那么my.ini里面应该有[newMySQL]段;
所以可以说:[client]下面的参数是所有mysql客户端都可以读取的参数,[mysql]是名称为mysql的客户端可以读取的参数;
3.[mysqld]下面对应的参数是最多的,这里面的参数是mysql服务器使用的,例如要改变新建的数据库的默认字符集,可以将[mysqld]字段下面的default-character-set设置为utf8,即default-character-set=utf8。注意了,[mysql]里面也有这个参数的设置哦,所以请区别好段。
好,理解了上面对三个中括号段的说明,我们应该在哪里设置就很明确了,同时为什么在那里设置也就很好回答了。至于参数的含义就不说了,注释很清楚。
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