for centos, open /etc/my.cnf
[mysqld]
datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.sock
user=mysql
# Default to using old password format for compatibility with mysql 3.x
# clients (those using the mysqlclient10 compatibility package).
old_passwords=1
# Disabling symbolic-links is recommended to prevent assorted security risks;
# to do so, uncomment this line:
# symbolic-links=0
key_buffer_size = 512M
max_allowed_packet = 4M
thread_stack = 256K
table_cache = 128K
sort_buffer_size = 6M
read_buffer_size = 4M
join_buffer_size = 8M
myisam_sort_buffer_size = 64M
table_cache = 512
thread_cache_size = 64
query_cache_size = 64M
tmp_table_size = 256M
max_connections = 768
max_connect_errors = 10000000
wait_timeout = 10
thread_concurrency = 12
[mysqld_safe]
log-error=/var/log/mysqld.log
pid-file=/var/run/mysqld/mysqld.pid
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