Re: new instance of postgres on windows

Arvind Singh wrote on 18.07.2013 12:22:
> I want to install postgresql for use as the backend to a Windows application.
>
> This seems to be no problem if postgresql is NOT already installed on the system. which is not in this case.
>
> postgresql is already installed and  unless the command line parameters contain the superpassword etc of the
>existing installation , the install fails. As I will likely never know the superpassword
>or other account details of any pre-existing postgresql instances and the machine owners may not either.
>
> How to then proceed and install a new  instance that can  be used by our application.

It's unclear to me if you want to re-use the existing installation and create a new cluser (aka "data directory" by
runninginitdb 
or if you want to install a completely new version along the original one (with it's own server and data directory)

If you want to install a completely new instance, just put it into a different directory, and given the service a
differentname. 

Newer Postgres versions don't need a dedicated Windows user account any more.

I usually don't use the installer any more, but I simply unzip the binary distribution, then run initdb with a
directoryof my choice (making sure the privileges are correctly setup) and then use pg_ctl to register the service. The
onlything you need to make sure is to change the port in postgresql.conf before starting the service. 

Something like this (batch file commands):

  echo superuserpassword> pwfile.txt
  unzip postgresql-9.2.4-1-windows-binaries.zip -d c:\MyApp\Postgres
  mkdir c:\MyApp\Data
  c:\MyApp\Postgres\bin\initdb -D c:\MyApp\Data -U postgres -pwfile=pwfile.txt -E UTF8 -A md5
  c:\MyApp\Postgres\bin\pg_ctl register -N my-app-postgres -S auto

Again: you have to make sure that the data directory has all the right privileges!