ubuntu - Why is Apache running wild and killing MySQL?

Apache has got out of control over the past few days and made MySQL crash twice. It all started when I migrated a WordPress website over which also contains a phpBB forum.

I'm not very experienced in server admin so it's been very difficult for me to pinpoint what is causing the issue. When I noticed that MySQL was down, I ran TOP and saw my system-load spike to 98.00. The server runs 10 V-HOSTS all of which receive a healthy amount of traffic so I was obviously seeing many apache-2 processes running.

The high server load continued for 10 mins and then it returned to a normal state. I didn't see a spike of network traffic at this point.

Unfortunately, MySQL error logging was disabled (it's now re-enabled) so no clues there. But I'm pretty sure it is because Apache was consuming all resources, so the MySQL process ID was killed.

My questions are:

Next time this occurs - how can I identify what is causing the system load spike? Could it be a php script that went crazy? Could it be a DDOS attack?

Is there a way of automatically re-starting MySQL when it crashes?

I have now installed htop. Could this be more useful than top?

Here my server stats:

m1.xlarge (8 ECUs, 4 vCPUs, 15 GiB memory, 4 x 420 GiB Storage Capacity)

Ubuntu Server 12.04.3 LTS

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