i've been having issue mysql crashing randomly, apparently result of not having enough available memory (as discussed here: https://www.digitalocean.com/community/questions/mysql-on-ubuntu-keeps-crashing).
i increased server 4gb 8gb of ram (and have added 512mb swap), seems have helped crashing, when @ server, mysql still consuming absurd amount of memory. normal? how can prevent happening?
here screenshot htop: https://nick.do/images/htop.png
why there many instances of mysql taking 246m each?
here's my.conf file looks like:
# # mysql database server configuration file. # # can copy 1 of: # - "/etc/mysql/my.cnf" set global options, # - "~/.my.cnf" set user-specific options. # # 1 can use long options program supports. # run program --help list of available options , # --print-defaults see understand , use. # # explanations see # http://dev.mysql.com/doc/mysql/en/server-system-variables.html # passed mysql clients # has been reported passwords should enclosed ticks/quotes # escpecially if contain "#" chars... # remember edit /etc/mysql/debian.cnf when changing socket location. [client] port = 3306 socket = /var/run/mysqld/mysqld.sock # here entries specific programs # following values assume have @ least 32m ram # formally known [safe_mysqld]. both versions parsed. [mysqld_safe] socket = /var/run/mysqld/mysqld.sock nice = 0 [mysqld] # # * basic settings # 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 lc-messages-dir = /usr/share/mysql skip-external-locking # # instead of skip-networking default listen on # localhost more compatible , not less secure. bind-address = * # # * fine tuning # key_buffer = 16m max_allowed_packet = 16m thread_stack = 192k thread_cache_size = 8 # replaces startup script , checks myisam tables if needed # first time touched myisam-recover = backup #max_connections = 100 #table_cache = 64 #thread_concurrency = 10 # # * query cache configuration # query_cache_limit = 1m query_cache_size = 16m # # * logging , replication # # both location gets rotated cronjob. # aware log type performance killer. # of 5.1 can enable log @ runtime! #general_log_file = /var/log/mysql/mysql.log #general_log = 1 # # error log - should few entries. # log_error = /var/log/mysql/error.log # # here can see queries long duration #log_slow_queries = /var/log/mysql/mysql-slow.log #long_query_time = 2 #log-queries-not-using-indexes # # following can used easy replay backup logs or replication. # note: if setting replication slave, see readme.debian # other settings may need change. #server-id = 1 #log_bin = /var/log/mysql/mysql-bin.log expire_logs_days = 10 max_binlog_size = 100m #binlog_do_db = include_database_name #binlog_ignore_db = include_database_name # # * innodb # # innodb enabled default 10mb datafile in /var/lib/mysql/. # read manual more innodb related options. there many! # # * security features # # read manual, too, if want chroot! # chroot = /var/lib/mysql/ # # generating ssl certificates recommend openssl gui "tinyca". # # ssl-ca=/etc/mysql/cacert.pem # ssl-cert=/etc/mysql/server-cert.pem # ssl-key=/etc/mysql/server-key.pem secure-file-priv = /var/tmp [mysqldump] quick quote-names max_allowed_packet = 16m [mysql] #no-auto-rehash # faster start of mysql no tab completition [isamchk] key_buffer = 16m # # * important: additional settings can override file! # files must end '.cnf', otherwise they'll ignored. # !includedir /etc/mysql/conf.d/
