An Odd Performance Problem with Update – Twitter Thread

I came across an odd performance problem in some legacy Oracle PL/SQL code that I was able to resolve by replacing an update statement with a merge. I abstracted the essence of the problem using the simple table from my last blog post, plus a summary table. Unlike in the previous article, the simple update did not work very well. I made a short Twitter thread on my findings…

Oracle Database 12c Enterprise Edition Release 12.2.0.1.0 – 64bit Production






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