What is purpose of `ALLOW_CONNECTIONS` being set so no one can connect to the new Postgres database?

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In Postgres 11, the CREATE DATABASE command that makes a new catalog has an option ALLOW_CONNECTIONS. The documentation says this option can be used to block all connections to the database:




[ ALLOW_CONNECTIONS [=] allowconn ]



allowconn



If false then no one can connect to this database. The default is true, allowing connections (except as restricted by other mechanisms, such as GRANT/REVOKE CONNECT).




➥ Why would anyone want to create a database that nobody can connect to?



➥ If you cannot connect, how can you ever change this setting to true to allow connections?






postgresql configuration connections







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    up vote
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    down vote

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    In Postgres 11, the CREATE DATABASE command that makes a new catalog has an option ALLOW_CONNECTIONS. The documentation says this option can be used to block all connections to the database:




    [ ALLOW_CONNECTIONS [=] allowconn ]



    allowconn



    If false then no one can connect to this database. The default is true, allowing connections (except as restricted by other mechanisms, such as GRANT/REVOKE CONNECT).




    ➥ Why would anyone want to create a database that nobody can connect to?



    ➥ If you cannot connect, how can you ever change this setting to true to allow connections?






    postgresql configuration connections







    share|improve this question























      up vote
      1
      down vote

      favorite









      up vote
      1
      down vote

      favorite











      In Postgres 11, the CREATE DATABASE command that makes a new catalog has an option ALLOW_CONNECTIONS. The documentation says this option can be used to block all connections to the database:




      [ ALLOW_CONNECTIONS [=] allowconn ]



      allowconn



      If false then no one can connect to this database. The default is true, allowing connections (except as restricted by other mechanisms, such as GRANT/REVOKE CONNECT).




      ➥ Why would anyone want to create a database that nobody can connect to?



      ➥ If you cannot connect, how can you ever change this setting to true to allow connections?






      postgresql configuration connections







      share|improve this question













      In Postgres 11, the CREATE DATABASE command that makes a new catalog has an option ALLOW_CONNECTIONS. The documentation says this option can be used to block all connections to the database:




      [ ALLOW_CONNECTIONS [=] allowconn ]



      allowconn



      If false then no one can connect to this database. The default is true, allowing connections (except as restricted by other mechanisms, such as GRANT/REVOKE CONNECT).




      ➥ Why would anyone want to create a database that nobody can connect to?



      ➥ If you cannot connect, how can you ever change this setting to true to allow connections?






      postgresql configuration connections




      postgresql configuration connections






      share|improve this question













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      asked 3 hours ago









      Basil Bourque

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          It gives you a chance to revoke connect from unwanted users before doing alter database ... allow connections






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            You might want to add to your answer that a superuser can always connect.
            – Colin 't Hart
            1 hour ago










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          1 Answer
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          up vote
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          It gives you a chance to revoke connect from unwanted users before doing alter database ... allow connections






          share|improve this answer
















          • 1




            You might want to add to your answer that a superuser can always connect.
            – Colin 't Hart
            1 hour ago














          up vote
          2
          down vote













          It gives you a chance to revoke connect from unwanted users before doing alter database ... allow connections






          share|improve this answer
















          • 1




            You might want to add to your answer that a superuser can always connect.
            – Colin 't Hart
            1 hour ago












          up vote
          2
          down vote










          up vote
          2
          down vote









          It gives you a chance to revoke connect from unwanted users before doing alter database ... allow connections






          share|improve this answer












          It gives you a chance to revoke connect from unwanted users before doing alter database ... allow connections







          share|improve this answer












          share|improve this answer



          share|improve this answer










          answered 1 hour ago









          Jasen

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            You might want to add to your answer that a superuser can always connect.
            – Colin 't Hart
            1 hour ago












          • 1




            You might want to add to your answer that a superuser can always connect.
            – Colin 't Hart
            1 hour ago







          1




          1




          You might want to add to your answer that a superuser can always connect.
          – Colin 't Hart
          1 hour ago




          You might want to add to your answer that a superuser can always connect.
          – Colin 't Hart
          1 hour ago

















           

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