How large is your board?

398.469 messages in a 214.4 Mo table.

How many members?

This is a migration frum another forum. We launch it yesterday and have to go back to the old forum. Yesterday, we had near 100 people connected at the same time (from de Who is online menu).

How much space does your host allocate for your MySQL database to be?

We have our own server (500Mhz, 256Mo RAM) with big disk drive. usr/local/ is 32% used ( total:4.9G used:1.5G avail:3.2G).

Have you exceeded that limit?

We put a limit for max_connections to 25 because it may crash our server if we put 100 or 150. Because table is locked, all other requests are stored in queue until the queue is full and max_connections is 25.

We've upgraded Mysql to 3.23.49a but we still have the problem.