I saw something interesting today when helping out someone on the
#mysql IRC channel. It was a cnf file that was designed to
destroy a server. Before I get into the why-not, here are the
goods:
...snip...
read_buffer = 128M
join_buffer = 128M
key_buffer = 512M
max_allowed_packet = 200M
thread_stack = 192K
thread_concurrency = 8
thread_cache_size = 64
query_cache_limit = 256M
query_cache_size = 256M
table_cache = 8192
query_cache_type = 1
sort_buffer = 128M
record_buffer = 128M
myisam_sort_buffer_size = 128M
thread_cache = 64
max_user_connections = 500
wait_timeout = 200
max_connections = 4096
tmp_table_size = 1000M
max_heap_table_size = 1000M
...snip...
Now, you may ask why these settings are bad. I will tell you. First, an equation for calculating per-thread …
[Read more]