"Hi Frank, I'm glad to get response from you. Did you get my email? I got it from google and not sure you are still using that email address.
So far I commented on these puzzles on OraQA:
How to solve the Coin Combinations Puzzle in SQL
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This post will help to analyze Oracle database instance slowdown that can happen due to considerable row cache lock (enqueue) wait events. It’s is based on a real case of a database hang that I worked on recently. I must admit this type of situation does not appear often but it’s very dangerous since it can considerably slow down a database instance or even freeze it for a short period of time. In most cases SQL against ASH view and Systemstate dumps can help to nail down the problem unless…