SilverStripe now has tentative support for PostgreSQL ('Postgres')
See docs/en for more information about configuring the module.
All column and table names must be double-quoted. PostgreSQL automatically lower-cases columns, and your queries will fail if you don't.
Ts_vector columns are not automatically detected by the built-in search filters. That means if you're doing a search through the CMS on a ModelAdmin object, it will use LIKE queries which are very slow. If you're writing your own front-end search system, you can specify the columns to use for search purposes, and you get the full benefits of T-Search.
If you are using unsupported modules, there may be instances of MySQL-specific SQL queries which will need to be made database-agnostic where possible.