[Mark_Zuckerberg]

hosting guy said

It appears multiple connections are being made to the database and not being killed off, causing the database not to be able to service any new requests. The site is up at this time. I would advise to reach out to you web developer in regards to this issue.

--------------- Added [DATE]1348867922[/DATE] at [TIME]1348867922[/TIME] ---------------

he also send me some recommendations which are this

General recommendations:
Run OPTIMIZE TABLE to defragment tables for better performance
MySQL started within last 24 hours - recommendations may be inaccurate
Reduce your overall MySQL memory footprint for system stability
Enable the slow query log to troubleshoot bad queries
Adjust your join queries to always utilize indexes
When making adjustments, make tmp_table_size/max_heap_table_size equal
Reduce your SELECT DISTINCT queries without LIMIT clauses
Variables to adjust:
*** MySQL's maximum memory usage is dangerously high ***
*** Add RAM before increasing MySQL buffer variables ***
query_cache_size (> 32M)
join_buffer_size (> 1.0M, or always use indexes with joins)
tmp_table_size (> 32M)
max_heap_table_size (> 16M)

what should i do know can you help me out?