Here is a sample configuration file with optimized default values for Directadmin. If your server load is average, it should suit your needs. Please, note, that this configuration is ready for MySQL 4, not for MySQL 5.
[mysqld]
local-infile=0
skip-locking
query_cache_limit=1M
query_cache_size=32M
query_cache_type=1
max_connections=500
interactive_timeout=100
wait_timeout=100
connect_timeout=10
thread_cache_size=128
key_buffer=16M
join_buffer=1M
max_allowed_packet=16M
table_cache=1024
record_buffer=1M
sort_buffer_size=2M
read_buffer_size=2M
max_connect_errors=10
# Try number of CPU’s*2 for thread_concurrency
thread_concurrency=2
myisam_sort_buffer_size=64M
server-id=1[safe_mysqld]
err-log=/var/log/mysqld.log
open_files_limit=8192[mysqldump]
quick
max_allowed_packet=16M[mysql]
no-auto-rehash
#safe-updates[isamchk]
key_buffer=64M
sort_buffer=64M
read_buffer=16M
write_buffer=16M[myisamchk]
key_buffer=64M
sort_buffer=64M
read_buffer=16M
write_buffer=16M[mysqlhotcopy]
interactive-timeout
