19

如何在my.cnf文件中设置内存限制。我试过了memory_limit = 64M。但它在重新启动 MYSQL 服务器时显示错误。任何人请帮助...

我的.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
4

2 回答 2

27

memory_limit MySQLmy.cnf文件中没有这样的变量。您只能从MySQL 服务器系统变量中添加变量。阅读这篇Mysql 如何使用内存

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

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。

my.cnf 文件中的示例变量：

#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
于 2012-08-24T06:37:02.173 回答
1

MySQL 中没有 memory_limit 限制设置。管理或限制 MySQL 内存使用的唯一方法是降低缓存、缓冲区和池大小的设置（确切的设置名称取决于您使用的存储引擎。一些适用于 MyISAM 引擎的设置（默认引擎） 是：

table_cache=1024
record_buffer=1M
sort_buffer_size=2M
read_buffer_size=2M
read_rnd_buffer_size=2M
myisam_sort_buffer_size=64M
thread_cache_size=128
query_cache_limit=1M
query_cache_size=64M
query_cache_type=1

对于 InnoDB，您有：

innodb_buffer_pool_size = 256M
innodb_additional_mem_pool_size = 20M
innodb_log_file_size = 64M
innodb_log_buffer_size = 8M

如果您希望更改 PHP 中的内存限制，那么该行（memory_limit = 64M）应该在 php.ini 文件中，而不是 my.cnf 中，它是 MySQL 的配置文件。

于 2012-08-24T06:41:06.720 回答