Date: Fri, 2 Jan 2015 11:54:17 -0500
From: Bruce Momjian <bruce@momjian.us>
To: Craig Ringer <craig@2ndquadrant.com>
Cc: Tom Lane <tgl@sss.pgh.pa.us>, girish R G peetle <giri.anamika0@gmail.com>,
 pgsql-admin <pgsql-admin@postgresql.org>
Subject: Re: PostgreSQL file system based restore from Linux to
 Windows
Message-ID: <20150102165417.GA22220@momjian.us>
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On Fri, Jan  2, 2015 at 06:56:47PM +0800, Craig Ringer wrote:
> On 12/31/2014 02:28 PM, Tom Lane wrote:
> > It might happen to work, if you're talking the same Intel-ish CPU type
> > on both ends ... but if it fails, don't call us.
> 
> It might for 32-bit, but I'm pretty sure it's not going to for 64-bit
> because Windows is LLP64 and Linux is LP64, so sizeof(long) differs. See
> http://en.wikipedia.org/wiki/64-bit_computing .
> 
> (Yet another area where Windows is annoyingly and pointlessly different,
> like use of UTF16 instead of UTF-8, though at least there they have the
> excuse of doing it first.)
> 
> Just use a Linux box or a virtual machine to start a copy of the
> database, then pg_dump -Fc it and pg_restore to a new instance on the
> Windows box.

I would also worry about collation differences between Linux and
Windows.  We have seen index problems with OS upgrades causing
mismatches, so I assume Windows and Linux might have even larger
mismatches.   We have discussed a way to test for mismatches but have
no solution yet.

-- 
  Bruce Momjian  <bruce@momjian.us>        http://momjian.us
  EnterpriseDB                             http://enterprisedb.com

  + Everyone has their own god. +


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