mysql ERROR! The server quit without updating PID file?

Question

My Vps mysql wont boot , when i attempt to command service mysql start i got this error

root@## [/var/lib/mysql]# service mysql start
Starting MySQL... ERROR! The server quit without updating PID file (/var/lib/mysql/***.***.com.pid).

this is my.cnf

[mysqld]
local-infile=0
set-variable = 100
max_connections=100
safe-show-database

#userstat_running=on
query_cache_limit=4M
query_cache_size=64M
query_cache_type=1
max_user_connections=100
interactive_timeout=30
wait_timeout=100
connect_timeout = 20
thread_cache_size = 256
key_buffer_size=16M
join_buffer_size=2M
max_heap_table_size=16M
low_priority_updates=1
max_allowed_packet=128M
max_seeks_for_key=100
record_buffer=2M
sort_buffer_size=16M
read_buffer_size=16M
max_connect_errors=10
# Try number of CPU's*2 for thread_concurrency
thread_concurrency=4
myisam_sort_buffer_size=64M
tmp_table_size= 64M
set-variable=table_cache=100
read_rnd_buffer_size=1M
skip-name-resolve

open_files_limit=6050
[mysqld_safe]

log-error=/var/log/mysqld.log

pid-file=/var/run/mysqld/mysqld.pid

and this is the error log

140227 21:23:41 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql
140227 21:23:41 [Note] Plugin 'FEDERATED' is disabled.
140227 21:23:41 InnoDB: The InnoDB memory heap is disabled
140227 21:23:41 InnoDB: Mutexes and rw_locks use InnoDB's own implementation
140227 21:23:41 InnoDB: Compressed tables use zlib 1.2.3
140227 21:23:41 InnoDB: Using Linux native AIO
140227 21:23:41 InnoDB: Initializing buffer pool, size = 128.0M
140227 21:23:41 InnoDB: Completed initialization of buffer pool
140227 21:23:41 InnoDB: highest supported file format is Barracuda.
140227 21:23:41  InnoDB: Waiting for the background threads to start
140227 21:23:42 InnoDB: 5.5.35 started; log sequence number 2155325
140227 21:23:42 [ERROR] /usr/sbin/mysqld: unknown variable 'set-variable=100'
140227 21:23:42 [ERROR] Aborting

140227 21:23:42  InnoDB: Starting shutdown...
140227 21:23:43  InnoDB: Shutdown completed; log sequence number 2155325
140227 21:23:43 [Note] /usr/sbin/mysqld: Shutdown complete

140227 21:23:43 mysqld_safe mysqld from pid file /var/lib/mysql/***/***.com.pid ended

how to fix this ? any idea

Answer 1

140227 21:23:42 [ERROR] /usr/sbin/mysqld: unknown variable 'set-variable=100'

remove the line from configuration file