Failed to load sql modules into the database cluster during PostgreSQL Installation

Question

I have attempted to install PostgreSQL 9.4 and 8.4 multiple times and it is failing no matter what I have tried. I am attempting to install on Windows 7 SP1 x64. After each

Answer 1

I had the same error ("Failed to load SQL modules into the database cluster.") when installing on W2K12R2 using the EnterpriseDB installer linked to from the PostgreSQL Windows download page. I tried running the installer with admin privs, and using the postgres-user solution offered by Jeff G, but neither worked. Finally I tried the second installer, BigSQL, and that installed without issue.

Answer 2

I was getting this issue with the BigSQL windows installer PostgreSQL-9.6.5-1-win64-bigsql.exe The problem turned out to be that my system path was too long. After removing some uncessary junk from my System Path, and then reinstalling, the problem was gone.

Answer 3

I was getting this same error when trying to install PostgreSQL v9.4.4 on Windows 10 Pro. Starting with a solution hosted on Stack Exchange, I came up with the following steps that allowed the installer to run successfully:

1) Create a new user account, called postgres
2) Add the new account to the Administrators and Power Users groups
3) Restart the computer
    NOTE: I added step #3, since step #4 didn't work without it
4) Run a command prompt as the postgres user, using the command:
    runas /user:postgres cmd.exe
5) Run the installer from the postgres command window
6) Delete the postgres user account, as well as the user directory
    NOTE: I added step #6, since the postgres account is not required after installation

Answer 4

I had the same problem before. I solved this by installing Visual Studio C++ Express first.

Answer 5

Encountered a very similar problem that OP is reporting today while installing Postgres 9.4.

It turns out that the password generator I was using has made a password that contains non-alphanumeric characters. ("^") I believe was the culprit in this case. Removing that allowed the installation of Postgres 9.4 (Windows 64 bit) to complete.

Very easy fix once you've found it, but the error message that comes up is not descriptive, so in this case I didn't notice at first what I was doing wrong.

Answer 6

I had the same problem, and noticed that some Postgres .bat files were opening in a text editor. Text editors opening files during installation isn't too uncommon, but I noticed these batch files were setting directory permissions. I then found that .bat files were set to open in a text editor (Notepad++) by default. I changed the default program for .bat files, uninstalled Postgres, re-ran the installer, and it worked perfectly. Hope this helps.