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Displaying posts with tag: Oracle Database (reset)
The Myth About Slow SQL JOIN Operations

In my recent SQL work for a large Swiss bank, I have maintained nested database view monsters whose unnested SQL code amounted up to 5k lines of code, joining the same table over and over again in separate subselects combined via UNION operations. This monster performed in way under 50ms, no matter how we queried it (see “10 more common mistakes” about the speed of queries). Of course, this performance was only achieved after lots of fine-tuning, load-testing and benchmarking. But it worked. Our Oracle database never let us down on these things.

Nonetheless, many SQL users think that JOIN operations are slow. Why? Perhaps because they are / used to be, in MySQL? I’m currently reading this interesting book by Markus Winand. The book is called …

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MySQL and PostgresSQL jobs on the Rise, Oracle job postings decline

This tweet from former MySQL AB CEO Mårten Mickos caught my eye. It shows a trend of increased demand for MySQL and PostgresSQL expertise while job postings on job websites for  those with Oracle and Ingres expertise declined.



I was a little shocked by the graph until you realize it’s just a trend. I then looked at the absolute number of jobs requesting database expertise and the story quickly becomes clear….


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