如何在my.cnf文件中设置内存限制 [英] How to set memory limit in my.cnf file

问题描述

如何在my.cnf文件中设置内存限制.我尝试了memory_limit = 64M.但是在重新启动MYSQL服务器时显示错误.任何人都可以帮助...

How to set memory limit in my.cnf file. I tried with memory_limit = 64M . But its showing error while restarting MYSQL server. Any one please help...

my.cnf

[mysqld]
datadir=/home/mysql/
tmpdir=/home/mysqltmp
#max_connections = 175 #was 175
max_connections = 80
#max_connect_errors = 350 #was 250
max_connect_errors = 250
safe-show-database
skip-locking
key_buffer = 1024M # was 128M
max_allowed_packet = 6M
myisam_sort_buffer_size = 64M

#old settings, for 900 ish max maxconn
#sort_buffer_size = 32M
#read_buffer_size = 32M
#read_rnd_buffer_size = 32M

sort_buffer_size = 5M
read_buffer_size = 5M
read_rnd_buffer_size = 5M

query_cache_size= 1024M
query_cache_limit= 16M
max_heap_table_size = 128M
tmp_table_size = 128M
thread_concurrency = 16
wait_timeout = 10
innodb_file_per_table
innodb_log_file_size = 10485760
open_files_limit = 8192
low_priority_updates = 1 
#log_slow_queries = /var/log/mysql_slow.log
#log_queries_not_using_indexes = 1
#slow_queries_log_file = /var/log/mysql_slow.log
memory_limit = 64M 
# who set these? these are NOT memory settings, but rather integer settings.
#table_cache = 1024M
#thread_cache_size = 8M

table_cache = 512
thread_cache_size = 8

[mysqldump]
quick
max_allowed_packet = 16M

[mysql]
no-auto-rehash

[isamchk]
key_buffer = 128M
sort_buffer_size = 128M
read_buffer = 2M
write_buffer = 2M

[myisamchk]
key_buffer = 128M
sort_buffer_size = 128M
read_buffer = 2M
write_buffer = 2M

推荐答案

在MySQL my.cnf文件中没有像memory_limit这样的变量.您只能从 MySQL服务器系统变量.阅读此 Mysql如何使用内存

There is no such variables like memory_limit in MySQL my.cnf file. You can add variables only from MySQL server system variables. Read this How Mysql uses memory

这取决于您的MySQL服务器的RAM大小.您可以根据以下用于MySQL内存需求计算的基本公式来相应地配置my.cnf文件:

It depends on RAM size of your MySQL server. You can configure your my.cnf file accordingly based on following basic formula for MySQL memory requirement calculation:

key_buffer_size + (read_buffer_size + sort_buffer_size) * max_connections = K bytes of memory

您可能需要配置这些基本参数.

you may need to configure these basic parameters.

对my.cnf文件中的变量进行采样:

Sample variables from my.cnf file:

#MyISAM
key_buffer_size = 8G
sort_buffer_size = 1M
read_buffer_size = 1M
read_rnd_buffer_size = 2M
myisam_sort_buffer_size = 2M
join_buffer_size = 2M

#Innodb
innodb_buffer_pool_size = 16G
innodb_additional_mem_pool_size = 2G
innodb_log_file_size = 1G
innodb_log_buffer_size = 8M
innodb_flush_log_at_trx_commit = 1
innodb_lock_wait_timeout = 30
innodb_file_format=barracuda

这篇关于如何在my.cnf文件中设置内存限制的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！