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How to use the BRIN index properly?

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Hello,

We have large tables with billions of rows in them and want to take advantage of the BRIN index on them.

Issues we are facing:
  • as I understand, BRIN index is useful only if the data is stored in index order. As an example we want to create a composite BRIN index on 3 columns - integers and strings (varchar). How can we tell Postgres to store data in index order as new records are inserted into the database?
  • i understand that turning on autosummarize will keep the index fresh and up-to-date as new records are inserted. is this correct?
Thanks for your help.

S.

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