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November 2018

From production to test in a minute

How to create test data just like your production data without moving or copying your actual data.

The Openworld Mega-Download!

If you are sad and pathetic enthusiastic and interested in content like me, once a large conference like OpenWorld is over, I like to have the content (slides etc ) from not just the sessions I attended, but all of the sessions I could not attend. In fact, I typically would like to have any and all available content, because that is probably the next best thing to attending the conference.

In particular, now that many of the sessions are streamed and/or capture for on-demand replay, either on the OpenWorld site directly, or via the Oracle Developers Youtube channel, the slides can then be viewed along with the presentation that drove them.

Join Cardinality – 5

So far in this series I’ve written about the way that the optimizer estimates cardinality for an equijoin where one end of the join has a frequency histogram and the other end has a histogram of type: