We are using the PostgreSQL pg_stats view to estimate file sizes for some geodata exports. However, the following query gives us totally different results on different servers:
select avg_width from pg_stats where tablename='some_geodata' and attname = 'GEOMETRY';
PostgreSQL 8.3.7 on i486-pc-linux-gnu, compiled by GCC gcc-4.3.real (Ubuntu 4.3.2-1ubuntu11) 4.3.2
81803
PostgreSQL 8.2.9 on i486-pc-linux-gnu, compiled by GCC cc (GCC) 4.1.2 (Ubuntu 4.1.2-0ubuntu4)
20450
Both tables have had VACUUM FULL ANALYZE run on them and have identical data. Note that 81803 is almost exactly 4x20450, though I don't know what significance this has. x64/i386 makes no difference.
I couldn't find anything in the 8.3 release notes that looked relevant. Any help appreciated.
Regards
Craig de Stigter
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Koordinates Ltd
PO Box 1604, Shortland St, Auckland, New Zealand
Phone +64-9-966 0433 Fax +64-9-969 0045
Web http://www.koordinates.com
