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I went through a re-installation of postgresql on a mac using brew and I'm not sure about some default vs user created databases.

After the installation I see 2 users:

  • postgres
  • dan (being my osx user).

These should be ok, normally they are created during installation.

Listing the databases I see:

  • postgres (ok, default)
  • template1 (ok, default)
  • dan (not sure about this)

So my questions are:

  1. what happened to template0 database? Did I deleted by accident or it's normal that postgres doesn't install it by default all the time? In case I've deleted what can I do to restore it? What's used for?

  2. did postgres installed the dan databases for storing info on my dan user or did I create it in the past (and forgot)? In this case I can delete it (it has no tables). How can I be sure who created this?

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  • 3
    What mechanism are you using to list the databases? Perhaps that mechanism intentionally excludes template0 from the list.
    – jjanes
    Commented Apr 24, 2019 at 15:46
  • 1
    You can see the true list of the databases using the query select * from pg_database;.
    – Sahap Asci
    Commented Apr 24, 2019 at 20:13
  • @jjanes you are right. I was using pgadmin and template0 was not visible. By using \list from the cli or select * from pg_database; I can see it. What's used for?
    – Leonardo
    Commented Apr 24, 2019 at 22:55

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