few doubts about RAC

Hello RAC gurus,

I have following basic doubts about RAC as we are going to implement 10g RAC on AIX 5L.

Q1. We are using midleware software 'texudo' to connect our databases. My question is, if one of my node get down, or fails, will be my activie session or connections automatically redirects to another node? If yes, then, if I am doing some query and in middle of my query I get this problem, then the other node will carry out from where other node got disconnected or it starts from frist again? what happens if my session doing DML?
Q2. Can I have two nodes with different configuration in terms of hardware , like cpus and memory or both nodes should be idential? Q3. How RAC will maintain the load balancing? Will it distribute the load parallely or distribute the load according to the node capacity?

Thanks for your time and valuable suggestions.

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Best Regards,
Jaffar, OCP DBA
Banque Saudi Fransi
Saudi Arabia
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