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Upgrade refers to the replacement of a product with a newer version of the same product. - replace (a software program) with a more recently released, enhanced version. - replace (a hardware device) with one that provides better performance.

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Drop tables but space not claimed in postgres 12

I have upgraded Postgresql 9.5 to Postgresql 12.4 a few days back using pg_upgrade utility with link (-k) option. So basically I am having two data directories i.e. One is old data directory (v9.5) a …
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