When there is too much traffic, if the load on the server is too high, it may cause the database to shut down or fail to respond to requests properly. This is usually because the database's performance resources are exhausted and it cannot continue to process more requests, causing the database to stop responding.

The following are some of the reasons that may lead to a database shutdown:

1. Insufficient Memory: If the server does not have enough memory, the database will not be able to load all the data, which will cause the database to stop responding.
2. Excessive CPU load: When there are too many requests, the server's CPU may reach or exceed its processing capacity limit, which can lead to database shutdown.
3. Insufficient hard disk space: If the database does not have enough hard disk space, the database may not be able to write new data, resulting in a database shutdown.
4. Lock Conflicts: If multiple requests access the same data in the database at the same time, this may result in a lock conflict, which can cause the database to shut down.
5. Network failure: If the network between the server and the database fails, the database may not be able to respond to requests, which may cause the database to shut down.

To avoid these problems, you need to optimize server and database configuration, increase server resources, optimize database indexes and query statements, and avoid lock conflicts and network failures. Also, techniques such as load balancing and caching can be used to share the server load and improve database performance and reliability.