A database structure that can improve the speed of queries at the cost of disk space and slower inserts/updates. It stores a copy of one or more columns but structures the data differently to allow for faster access.

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Increase in IO Wait after adding indexes with postgres

I've recently been put in charge of a system that has been fairly untended for a period of time. The majority of activity is via queued worker jobs based off of data feeds from other systems/data ...