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    <p>In general you can have multiple <strong>independent</strong> instances of PostgreSQL. Strictly speaking it's database cluster with separate:</p> <ul> <li>data directory</li> <li>configuration (e.g. <code>postgresql.conf</code>, <code>pg_hba.conf</code>)</li> <li>listening TCP/UDP port (default 5432+)</li> <li>owner user and superuser role</li> <li>locale and default encoding</li> <li>log file</li> <li>postmaster server process (on Windows postgres.exe)</li> </ul> <p>Perfect well-done example is Debian with easy to use <a href="http://packages.debian.org/squeeze/postgresql-common" rel="noreferrer"><code>postgresql-common</code></a> infrastructure (pg_ctlcluster, pg_lsclusters, pg_createcluster, pg_dropcluster, included SSL, log rotation and so on).</p> <p><strong>EDIT:</strong></p> <p>I found it's rather easy to install second, third, etc. instance of same versioned PostgreSQL under Windows with <a href="http://www.enterprisedb.com/products-services-training/pgdownload" rel="noreferrer">EnterpriseDB's installer</a>, <strong>no need</strong> to use <a href="http://www.postgresql.org/docs/current/static/app-initdb.html" rel="noreferrer"><code>initdb</code></a> and <a href="http://www.postgresql.org/docs/current/static/app-pg-ctl.html" rel="noreferrer"><code>pg_ctl</code></a> (assuming 64-bit installation, probably you need to use <code>Program Files (x86)</code> for 32-bit installation):</p> <ol> <li>Open <code>cmd</code> with admin privileges (Run as Administrator)</li> <li>Execute: <code>cd "C:\Program Files\PostgreSQL\9.0\installer\server"</code></li> <li>Create new database cluster (press Enter on every step): <code>initcluster.vbs postgres postgres 12345 "C:\Program Files\PostgreSQL\9.0" "C:\Program Files\PostgreSQL\9.0\data2" 5433 DEFAULT</code></li> <li>Register as Windows Service: <code>startupcfg.vbs 9.0 postgres 12345 "C:\Program Files\PostgreSQL\9.0" "C:\Program Files\PostgreSQL\9.0\data2" postgresql-x64-9.0-2</code></li> <li>Run newly created service <code>postgresql-x64-9.0-2</code> using <code>services.msc</code> and you have second server</li> </ol> <p>Change <code>12345</code> to your password specified during PostgreSQL installation. You don't have to use <code>data2</code> directory, use whatever you like (but of course not existing <code>data</code> directory). </p>
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    1. USGrzegorz Szpetkowski
    1. USGrzegorz Szpetkowski
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