Question

我有问题。我的网站很慢我认为是mysql。最多可连接100个用户。在大多数情况下为30-40人。

我的服务器：

英特尔至强E3-1230v3
16 GB DDR3 Ram
240 GB OCZ SSD磁盘
Centos 7 WHM-cPanel MariaDB

...

PID USER      PR  NI    VIRT    RES    SHR S  %CPU  %MEM     TIME+ COMMAND
12496 mysql   20   0   14.1g   1.3g  12228 S 576.1  8.2 116:38.62

/ usr / sbin / mysqld

/etc/my.cnf：

port        = 1905
socket      = /var/lib/mysql/mysql.sock

# The MySQL Safe server
[mysqld_safe]
open_files_limit = 58000
# The MySQL server
[mysqld]
max_connections = 300
local-infile    = 0
socket      = /var/lib/mysql/mysql.sock
skip-external-locking
key_buffer_size = 1024M
table_open_cache = 4096
open_files_limit = 40960
max_allowed_packet=1073741824
sort_buffer_size = 4M
read_buffer_size = 4M
join_buffer_size = 4M
sort_buffer_size = 4M
read_rnd_buffer_size = 128M
myisam_sort_buffer_size = 128M
thread_cache_size = 16
#query_cache_size= 32M
tmp_table_size = 64M
max_heap_table_size = 64M

#table_cache    = 1024

#Slowly log
slow-query-log = 1
slow-query-log-file = /var/lib/mysql/mysql-slow.log
long_query_time = 1

# Uncomment the following if you are using InnoDB tables
innodb_file_per_table= 1
#innodb_data_home_dir = /var/lib/mysql
#innodb_data_file_path = ibdata1:50M:autoextend
#innodb_log_group_home_dir = /var/lib/mysql
# You can set .._buffer_pool_size up to 50 - 80 %
# of RAM but beware of setting memory usage too high
innodb_buffer_pool_size = 8096M
#innodb_additional_mem_pool_size = 64M
# Set .._log_file_size to 25 % of buffer pool size
#innodb_log_file_size = 64M
#innodb_log_buffer_size = 8M
#innodb_flush_log_at_trx_commit = 1
#innodb_lock_wait_timeout = 50

# Connection Settings
wait_timeout = 60
skip-external-locking



[mysqldump]
quick
max_allowed_packet = 64M

[mysql]
no-auto-rehash
# Remove the next comment character if you are not familiar with SQL
#safe-updates

[myisamchk]
key_buffer_size = 512M
sort_buffer_size = 256M
read_buffer = 8M
write_buffer = 8M
# Query Cache Settings
query_cache_type = 1
query_cache_limit = 256K
query_cache_min_res_unit = 2k
query_cache_size = 80M
skip-external-locking

[mysqlhotcopy]
interactive-timeout

我该怎么办？

谢谢。

Answer 1

底线：添加一些索引会很有帮助：

INDEX(islemkey)
INDEX(site, durum, islem_baslangic)
INDEX(durum, site, site_durum, id)

详细信息

UPDATE odemeler SET step='odeme_kontrol' WHERE islemkey = '78TNgyacgjwt'

您需要在INDEX(islemkey)上使用odemeler。

`expire` varchar(255) DEFAULT NULL,
AND islem_baslangic LIKE '2018-11-29%'

如果expire是DATE或DATETIME，则应声明为islem_baslangic。如果采用某些非标准日期格式，则需要进行转换。 SELECT * FROM odemeler WHERE site = '71' AND durum = '1'和其他任何包含日期的列也一样。

odemeler

INDEX(site, durum)需要此复合SELECT id,tcno, miktar,durum,islem_baslangic,site,site_durum FROM odemeler WHERE site = '74' AND durum = '1' AND site_durum = '0' ORDER BY id DESC LIMIT 20；可选地，它们可以以相反的顺序列出。

INDEX(site, durum, site_durum,  -- in any order
      id)   -- last

需要

PROCESSLIST

原因

在没有可用索引的情况下，PROCESSLIST中显示的大多数查询必须扫描整个表。这会占用大量CPU。而且它会减慢每个查询的速度。然后查询堆积。（一次在scatter中有很多查询。）

有了可用的索引，每个查询的来来去去更快，并且使用的CPU更少。这就是索引的目的！

Answer 2

以root用户登录WHM，在Multi PHP manager中，将网站切换到PHP 7.1。为该特定网站启用php-fpm。

第二，下载mysql调谐器脚本，该脚本将帮助您调整/etc/my.cnf设置以获得最佳的mysql性能。

如果即使进行了所有这些更改后一切仍然无法正常工作，则您将不得不优化mysql数据库。

Answer 3

每秒速率= RPS建议，用于my.cnf [mysqld]部分以提高性能，

read_rnd_buffer_size=256K  # from 128M to reduce handler_read_rnd_next RPS from 6 million +
innodb_io_capacity=1900  # from 200 to enable more of your SSD io capacity
thread_cache_size=100  # from 16 to reduce threads_created count of 24,136 in 8 hrs
aria_pagecache_buffer_size=64M  # from 128M to conserve RAM, only 2 blocks used in 8 hrs
key_buffer_size=128M  # from 1G to conserve RAM, 15M used was the High Water Mark

Aras and Furkan，如果仍未创建索引（由Rick James建议），请发表评论，表明您需要此请求的帮助，以通过索引管理来提高性能。

Centos 7，WHM高Mysql＆MariaDB CPU使用率％600

3 个答案: