1. https://serverfault.com/questions/490656/mysql-not-starting-error-usr-sbin-mysqld-unknown-option-query-cache-si

I have a big problem.

i try to start mysql in ubuntu, butI have this error:

130323  0:13:55 [Note] Plugin ‘FEDERATED‘ is disabled.
130323  0:13:55 InnoDB: The InnoDB memory heap is disabled
130323  0:13:55 InnoDB: Mutexes and rw_locks use GCC atomic builtins
130323  0:13:55 InnoDB: Compressed tables use zlib 1.2.3.4
130323  0:13:55 InnoDB: Initializing buffer pool, size = 8.0G
130323  0:13:55 InnoDB: Completed initialization of buffer pool
130323  0:13:55 InnoDB: highest supported file format is Barracuda.
130323  0:13:55  InnoDB: Waiting for the background threads to start
130323  0:13:56 InnoDB: 1.1.8 started; log sequence number 1195255849922
130323  0:13:56 [ERROR] /usr/sbin/mysqld: unknown option ‘--query_cache_size-128M‘
130323  0:13:56 [ERROR] Aborting

130323  0:13:56  InnoDB: Starting shutdown...
130323  0:13:57  InnoDB: Shutdown completed; log sequence number 1195255849922
130323  0:13:57 [Note] /usr/sbin/mysqld: Shutdown complete
 

This has no sense, because I dont use that in the my.cnf:

    #
# 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
#
user            = mysql
pid-file        = /var/run/mysqld/mysqld.pid
socket          = /var/run/mysqld/mysqld.sock
port            = 3306
basedir         = /usr
#datadir                = /var/lib/mysql
datadir       = /home/mysql
tmpdir          = /tmp
lc-messages-dir = /usr/share/mysql
skip-external-locking

#innodb_force_recovery = 3
#
# 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
#
# * Fine Tuning
#
key_buffer              = 500M
max_allowed_packet      = 128M
thread_stack            = 192K
thread_cache_size       = 8

default-storage-engine = INNODB

# This replaces the startup script and checks MyISAM tables if needed
# the first time they are touched
myisam-recover         = BACKUP
max_connections        = 75
sort_buffer_size = 4M
join_buffer_size = 4M
table_cache            = 128K
#thread_concurrency     = 10
#
# * Query Cache Configuration
#
query_cache_limit       = 1M
query_cache_size        = 16M
#
# * Logging and Replication
#
# Both location gets rotated by the cronjob.
# Be aware that this log type is a performance killer.
# As of 5.1 you can enable the log at runtime!
general_log_file        = /var/log/mysql/mysql.log
log-error=/var/log/mysql.err
#general_log             = 1
#
# Error logging goes to syslog due to /etc/mysql/conf.d/mysqld_safe_syslog.cnf.
#
# Here you can see queries with especially long duration
#log_slow_queries       = /var/log/mysql/mysql-slow.log
#long_query_time = 2
#log-queries-not-using-indexes
#
# The following can be used as easy to replay backup logs or for replication.
# note: if you are setting up a replication slave, see README.Debian about
#       other settings you may need to 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 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

innodb_additional_mem_pool_size = 50M
innodb_thread_concurrency = 8
innodb_flush_method = O_DSYNC
innodb_flush_log_at_trx_commit = 2
innodb_buffer_pool_size = 8G
innodb_log_files_in_group = 2
innodb_log_file_size = 32M
innodb_log_buffer_size = 16M
innodb_file_per_table = 1
innodb_table_locks = 0

[mysqldump]
quick
quote-names
max_allowed_packet      = 16M

[mysql]
#no-auto-rehash # faster start of mysql but no tab completition

[isamchk]
key_buffer              = 16M

#
# * 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/
 

Any ideas? :(

• 1 Fix the typo. Then it should work. – Michael Hampton? Mar 22 ‘13 at 23:22
• the typo is the minus sign where equals should be: query_cache_size-128M -> query_cache_size=128M – user16081-JoeT Mar 23 ‘13 at 0:13

###########2.

問題描述】

使用

service mysqld start

啟動MySQL服務失敗，提示

Starting MySQL. ERROR! The server quit without updating PID file

【解決方案】

在my.cnf配置文件中的 [mysqld_safe] 下添加

log-error = /apps/logs/mysql/error.log # 表示mysql服務啟動日誌文件的位置，路徑可以根據自己的系統更改

之後再次啟動mysql服務，查看error.log文件，註意error標簽的提示內容，修改相應的錯誤

mysql 無法啟動 unkown command