Question

我的数据库服务器（双四核50 gb内存）存在负载问题

平均负载：4.26,6.78,11.25

这是当前的my.cnf，我能优化吗？

[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2000名在线用户。

Answer 1

我总是从watch "mysqladmin pr -vv"开始看看哪个陈述是最糟糕的...然后你应该知道要调整哪个变量......大部分时间它都是缺失的索引。

Answer 2

使用 mytop 和 mysqltuner 分析使用mysql资源（RAM和CPU）。

太多启用选项以记录慢查询：

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

查看这篇关于 ntpd 服务的帖子：

MySQL high CPU usage

我有专门用于高交易率的服务器：

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

问候。

mysql my.cnf用于50GB的RAM服务器

2 个答案: