Database - RAC/Scalability (MOSC)

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Database availability on the remaining survival instance after an instance of a RAC cluster is down?

edited Mar 25, 2019 5:38AM in Database - RAC/Scalability (MOSC) 5 commentsAnswered

I'd like to know database availability on the remaining survival instance after an instance is down, and how long the unavailability will take.

Say a RAC cluster contains node A and B. It works well, but I suddenly turn off node A. So what happens to the instance on node B?

My basic understanding is:

1. Before heartbeat timeout (default is 30s), B is available. However, if a SQL query tries to access a buffer block which was held by A, then it will hit an error (or hang there). So, we can say that B is not available during this period.

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