Rails/MySql - amount of database connection pool

What is the recommended amount of connection pool to a MySql DB on a Rails 2.3.8 application, to my understanding the default is 5, is this enough开发者_运维知识库?

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There's no way to answer that question w/o more information.

What's your expected load? How long does your average DB transaction last? How much data is loaded per query (average)?