[mysqld]
datadir =/var/lib/mysql
socket =/var/lib/mysql/mysql.sock
log_slow_queries =/var/log/mysql/mysql-slow.log
port = 3306
skip-locking
max_connections = 200
key_buffer = 16M
myisam_sort_buffer_size = 32M
table_cache = 1024
thread_cache_size = 512
join_buffer_size = 2M
sort_buffer_size = 2M
read_buffer_size = 2M
read_rnd_buffer_size = 512K
net_buffer_length = 256K
thread_stack = 256K
tmp_table_size = 16M
query_cache_limit = 2M
query_cache_size = 16M
query_cache_type = 1
thread_cache_size = 256
thread_concurrency = 4
long_query_time = 2
skip-bdb
skip-innodb

[mysqldump]
quick
max_allowed_packet = 32M

[mysql]
no-auto-rehash
#safe-updates

[mysqld_safe]
open_files_limit = 8192

[isamchk]
key_buffer = 16M
sort_buffer_size = 16M
read_buffer = 16M
write_buffer = 16M

[myisamchk]
key_buffer = 16M
sort_buffer_size = 16M
read_buffer = 16M
write_buffer = 16M

[mysqlhotcopy]
interactive-timeout

[client]
socket=/path/to/mysql.sock


Try this for 512 Memory