RAC (high availabilty in a disconnection period)

Dear DBAs,
we have a concern which need additional info.
As i know, "high availability using RAC" means that the users should remain connected to the database or at least disconnected for few seconds when a node (in RAC en. active/active) goes down.
My question is:
let's say i have 2 nodes and 100 users are connected to the database. what happened in case the 2st node/server goes down ?
1. the users, connected to this node, will automatically switch to the other node without the need to manually reconnect again?
2. the users, connected to this node, will be disconnected, the transaction will rollback, and the users should manually reconnect again ?
Note that my oracle version is 10gR2 and i'm using Oracle clusterware.
Thank in advance for your help
Regards
Elie
Edited by: Elie on Mar 8, 2010 10:55 AM

ok,
let's say my application is a banking application and as usual a process called EOD (End Of Day) should run from a client machine.
this process will make many tables insert, update, delete.
what might happen in case this node (where the EOD's session is connected) ?
do we have to run the process again ? or it continue running ?
Thx again

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