mysql my.cnf用於50gb的RAM服務器

Question

我的數據庫服務器上出現負載問題（雙四核50 GB RAM）

平均負載：4.26、6.78、11.25

這是當前的my.cnf，我可以對其進行優化嗎？

[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

該網站有大約2000個在線用戶。

Answer 1

您可以使用mytop和mysqltuner來分析使用mysql資源（RAM和CPU）的情況。

啟用日志記錄慢查詢的選項：

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

並查看有關ntpd服務的帖子：

MySQL高CPU使用率

我有專用的服務器來進行高交易率：

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

問候。

Answer 2

我總是從watch "mysqladmin pr -vv" ，看看哪個語句最糟糕……然后您應該知道要調整的變量……大多數情況下，它是缺少索引的地方。