用于50 of内存服务器的mysql my.cnf

Question

我的数据库服务器(双四核50 gb内存)出现了负载问题

平均负载: 4.26、6.78、11.25

这是当前的my.cnf，我可以优化它吗？

[client]
port            = 3306
socket          = /var/run/mysqld/mysqld.sock

[mysqld_safe]
socket          = /var/run/mysqld/mysqld.sock
nice            = 0

[mysqld]
user            = mysql
pid-file        = /var/run/mysqld/mysqld.pid
socket          = /var/run/mysqld/mysqld.sock
port            = 3306
basedir         = /usr
datadir         = /var/lib/mysql
tmpdir          = /tmp
language        = /usr/share/mysql/english
skip-external-locking

key_buffer              = 150M
key_buffer_size = 512M
max_allowed_packet      = 16M
thread_stack            = 128K
thread_cache_size       = 128
open-files              = 8192

myisam-recover          = BACKUP
max_connections        = 1000
table_cache            = 8096
join_buffer_size        = 2M
tmp_table_size          = 10G
max_heap_table_size     = 10G
innodb_buffer_pool_size = 10G
innodb_additional_mem_pool_size = 128M
innodb_log_file_size = 100M
log-slow-queries        = /var/log/mysql/slow.log
sort_buffer_size        = 5M
net_buffer_length       = 5M
read_buffer_size        = 2M
read_rnd_buffer_size    = 12M
thread_concurrency     = 16
ft_max_word_len = 30
ft_min_word_len = 2
#thread_concurrency     = 10

query_cache_limit       = 4M
query_cache_size        = 512M

该网站约有2,000名在线用户。

Answer 1

我总是从watch "mysqladmin pr -vv"开始，看看哪些语句是最差的……那么你应该知道该调整什么变量……大多数情况下，它是一个缺失的索引。

Answer 2

您可以使用mysql mytop和mysqltuner来分析使用资源(内存和)的情况。

to enable to log slow queries选项

log_slow_queries = /var/log/mysql/mysql-slow.log
long_query_time = 3

并查看这篇关于ntpd服务的文章：

MySQL high CPU usage

我有一台专用服务器来处理高事务率：

max_allowed_packet=16M
key_buffer_size=8M
innodb_additional_mem_pool_size=10M
innodb_buffer_pool_size=512M
join_buffer_size=40M
table_open_cache=1024
query_cache_size=40M
table_definition_cache=256
innodb_additional_mem_pool_size=10M
key_buffer_size=16M
max_allowed_packet=32M
max_connections = 300
query_cache_limit = 10M
log_slow_queries = /var/log/mysql/mysql-slow.log
long_query_time = 3

致以问候。