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Here’s an example that makes perfect sense if you know how Oracle handles data locking. It’s one that I thought I’d published years ago, but it’s not on the blog and the only reference I can find is in a reply to an old Oracle Forum note, so if you’ve seen it before please let me know where.
There are a few difference meanings to the meaning of the word ...
This note isn’t a “real” case study, i.e. it’s not going to show you details of the data, indexes, plans etc. from a production system, but it is modelling one aspect of an execution plan that appeared on a production system to highlight a couple of implementation details that have been around for a very long time but are easy to overlook.
RemindersIn a multi-c...