นานๆทีจะขึ้นแบบนี้คับ
Lost connection to MySQL server at ‘reading initial communication packet’, system error: 0
แล้วอาการก็จะหน่วงๆ แล้ว load average ก็จะขึ้นสูงประมาณ 100 แล้วก็จะลงมาต่ำเหมือนเดิม
เครือ่งเป็น dell r210 ram 16 GB
เรียนท่านเทพช่วยแจงหรือปรับ หรือ my.cnf ตัวที่ปรับมาแล้วหรืออะไรอย่างงี้ก็ได้คับ
อันนี้เป็น my.cnf ของผมคับ
#########################################################
The MySQL database server configuration file.
You can copy this to one of:
- “/etc/mysql/my.cnf” to set global options,
- “~/.my.cnf” to set user-specific options.
One can use all long options that the program supports.
Run program with --help to get a list of available options and with
–print-defaults to see which it would actually understand and use.
For explanations see
http://dev.mysql.com/doc/mysql/en/server-system-variables.html
This will be passed to all mysql clients
It has been reported that passwords should be enclosed with ticks/quotes
escpecially if they contain “#” chars…
Remember to edit /etc/mysql/debian.cnf when changing the socket location.
[client]
port = 3306
socket = /var/run/mysqld/mysqld.sock
Here is entries for some specific programs
The following values assume you have at least 32M ram
This was formally known as [safe_mysqld]. Both versions are currently parsed.
#[mysqld_safe]
#socket = /var/run/mysqld/mysqld.sock
#nice = 0
[mysqld]
* Basic Settings
* IMPORTANT
If you make changes to these settings and your system uses apparmor, you may
also need to also adjust /etc/apparmor.d/usr.sbin.mysqld.
user = mysql
socket = /var/run/mysqld/mysqld.sock
port = 3306
basedir = /usr
datadir = /var/lib/mysql
tmpdir = /tmp
skip-external-locking
skip-name-resolve
Instead of skip-networking the default is now to listen only on
localhost which is more compatible and is not less secure.
#bind-address = 127.0.0.1
#bind-address = 192.168.250.2
bind-address = 0.0.0.0
#bind-address = localhost
#–skip-networking
* Fine Tuning
key_buffer = 8048M
max_allowed_packet = 256M
thread_stack = 128K
thread_cache_size = 256
myisam-recover = BACKUP
query_cache_limit = 256M
query_cache_size = 128M
#log_error = /var/log/mysql/error.log
Here you can see queries with especially long duration
#log_slow_queries = /var/log/mysql/mysql-slow.log
#long_query_time =
log-queries-not-using-indexes
#server-id = 1
#log_bin = /var/log/mysql/mysql-bin.log
expire_logs_days = 1
max_binlog_size = 64M
max_connections = 150000
max_connect_errors = 10000
max_allowed_packet = 64M
table_cache = 500000
sort_buffer_size = 3024M
read_buffer_size = 256M
read_rnd_buffer_size = 3524M
myisam_sort_buffer_size = 3524M
thread_cache = 92
thread_concurrency = 256
default-character-set=utf8
max_tmp_tables = 400
tmp_table_size= 3024M
concurrent_insert=4
low_priority_updates=1
#binlog_do_db = include_database_name
#binlog_ignore_db = include_database_name
* InnoDB
InnoDB is enabled by default with a 10MB datafile in /var/lib/mysql/.
Read the manual for more InnoDB related options. There are many!
* Security Features
Read the manual, too, if you want chroot!
chroot = /var/lib/mysql/
For generating SSL certificates I recommend the OpenSSL GUI “tinyca”.
ssl-ca=/etc/mysql/cacert.pem
ssl-cert=/etc/mysql/server-cert.pem
ssl-key=/etc/mysql/server-key.pem
[mysqldump]
quick
quote-names
max_allowed_packet = 128M
[mysql]
#no-auto-rehash # faster start of mysql but no tab completition
#[isamchk]
#key_buffer = 512M
#sort_buffer_size = 256M
#read_buffer = 556M
#write_buffer = 556M
#[myisamchk]
#key_buffer = 512M
#sort_buffer_size = 1024M
#read_buffer = 1024M
#write_buffer = 128M
* IMPORTANT: Additional settings that can override those from this file!
The files must end with ‘.cnf’, otherwise they’ll be ignored.
!includedir /etc/mysql/conf.d/
#########################################################