MySQL设置项
下面一张表格是我从国外的一个博客里边摘抄下来的MySQL的一些默认配置项和最低设置参数。
设置项 | 默认 | 最低 |
innodb_buffer_pool_size | 128M | 5M |
innodb_log_buffer_size | 1M | 256K |
query_cache_size | 1M | 0 |
max_connections | 151 | 1 (推荐最低设置为10) |
key_buffer_size | 8388608 | 8 |
thread_cache_size | (自动配置) | 0 |
host_cache_size | (自动配置) | 0 |
innodb_ft_cache_size | 8000000 | 1600000 |
innodb_ft_total_cache_size | 640000000 | 32000000 |
thread_stack | 262144 | 131072 |
sort_buffer_size | 262144 | 32K |
read_buffer_size | 131072 | 8200 |
read_rnd_buffer_size | 262144 | 8200 |
max_heap_table_size | 16777216 | 16K |
tmp_table_size | 16777216 | 1K |
bulk_insert_buffer_size | 8388608 | 0 |
join_buffer_size | 262144 | 128 |
net_buffer_length | 16384 | 1K |
innodb_sort_buffer_size | 1M | 64K |
binlog_cache_size | 32K | 4K |
binlog_stmt_cache_size | 32K | 4K |
依据以上参数,MySQL的最小配置为:
# /etc/my.cnf: innodb_buffer_pool_size=5M innodb_log_buffer_size=256K query_cache_size=0 max_connections=10 key_buffer_size=8 thread_cache_size=0 host_cache_size=0 innodb_ft_cache_size=1600000 innodb_ft_total_cache_size=32000000 # per thread or per operation settings thread_stack=131072 sort_buffer_size=32K read_buffer_size=8200 read_rnd_buffer_size=8200 max_heap_table_size=16K tmp_table_size=1K bulk_insert_buffer_size=0 join_buffer_size=128 net_buffer_length=1K innodb_sort_buffer_size=64K #settings that relate to the binary log (if enabled) binlog_cache_size=4K binlog_stmt_cache_size=4K
但是并不推荐使用最小配置,可以适当修改一下。
在另外一个博客上找到了一个比较适合于512M内存的配置:
# Example MySQL config file for large systems. # # This is for a large system with memory = 512M where the system runs mainly # MySQL. # # MySQL programs look for option files in a set of # locations which depend on the deployment platform. # You can copy this option file to one of those # locations. For information about these locations, see: # http://dev.mysql.com/doc/mysql/en/option-files.html # # In this file, you can use all long options that a program supports. # If you want to know which options a program supports, run the program # with the "--help" option. # The following options will be passed to all MySQL clients [client] #password = your_password port = 3306 socket = /var/lib/mysql/mysql.sock # Here follows entries for some specific programs # The MySQL server [mysqld] port = 3306 socket = /var/lib/mysql/mysql.sock skip-external-locking key_buffer_size = 256M max_allowed_packet = 1M table_open_cache = 256 sort_buffer_size = 1M read_buffer_size = 1M read_rnd_buffer_size = 4M myisam_sort_buffer_size = 64M thread_cache_size = 8 query_cache_size= 16M # Try number of CPU's*2 for thread_concurrency thread_concurrency = 8 # 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 # binary logging format - mixed recommended binlog_format=mixed # required unique id between 1 and 2^32 - 1 # defaults to 1 if master-host is not set # but will not function 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 function 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 # Uncomment the following if you are using InnoDB tables #innodb_data_home_dir = /var/lib/mysql #innodb_data_file_path = ibdata1:10M:autoextend #innodb_log_group_home_dir = /var/lib/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 = 256M #innodb_additional_mem_pool_size = 20M # Set .._log_file_size to 25 % of buffer pool size #innodb_log_file_size = 64M #innodb_log_buffer_size = 8M #innodb_flush_log_at_trx_commit = 1 #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 [myisamchk] key_buffer_size = 128M sort_buffer_size = 128M read_buffer = 2M write_buffer = 2M [mysqlhotcopy] interactive-timeout
链接:
1.Configuring MySQL to use minimal memory
2.Mysql sample configuration with 512M ram
转载自:Index 2015年12月9日 于 扩软博客 发表
转载于:https://my.oschina.net/asddsa/blog/1605465
最新评论: