Hello, Look on this blog post http://blog.cleverelephant.ca/2012/02/postgis-vs-oracle-spatial.html that redirect you to a complete paper comparing Oracle and PostGIS. For perfs too, see some thoughts about latest PostgreSQL features (not spatial in particular) http://www.databasesoup.com/2012/04/foss4g-na-2012.html For tuning advice focusing on PostGIS http://underdark.wordpress.com/2011/01/14/postgis-tuning/ who share the link to OpenGeo tutorial Dont forget the official PostgreSQL wiki http://wiki.postgresql.org/wiki/Tuning_Your_PostgreSQL_Server
Regards ThomasG
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