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I have a table with some 670000 records inside it and some indexes.

I created a new index and now I need to know if I have to manually go and reindex that table or Postgres will automatically do that.

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    reindex will re-create all indexes on the table. Why do you think you would need that if you just add a new index? Commented Apr 22, 2015 at 6:38
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    postgresql.org/docs/9.4/static/sql-reindex.html Commented Apr 22, 2015 at 6:40

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So I found the answer and it is NO, Postgres does not automatically reindex all the table when you add a new index to it.

Anyway, @a_horse_with_no_name point is good, usually there is no need to reindex all the table when you add a new index to it

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