Where can I find the documentation for the PostgreSQL for Solaris software?
The same PostgreSQL documentation, available at http://www.postgresql.org/docs, applies to PostgreSQL for Solaris since Sun contributes all changes to the core back to the community. For certain Solaris specific packaging or enhancements, documentation is provided in the man pages. For example, the postgres_82 man page describes how to manage PostgreSQL using the Solaris Service Management Facility. The PostgreSQL Community is also a good source of information.
