On rare occasion you may need to restart the PostgreSQL server, this is usually only necessary if you needed to perform a configuration change which requires a restart. PokerTracker 4 supports the following PostgreSQL versions and restart methods:
Windows:
PostgreSQL 8.3.18 or greater: Computer Restart, Start and Stop Applications, Command Line
PostgreSQL 8.4.12 or greater: Computer Restart, Start and Stop Applications, Command Line
PostgreSQL 9.0.7 or greater: Computer Restart, Command Line
PostgreSQL 9.1: Not Supported
PostgreSQL 9.2: Not Supported
Mac OS X:
PostgreSQL 8.4.12 or greater: Computer Restart, Start and Stop Applications, Command Line
PostgreSQL 9.0.7 or greater: Computer Restart, Command Line
PostgreSQL 9.1: Not Supported
PostgreSQL 9.2: Not Supported
Additionally it can be noted that PostgreSQL may be restarted from within the PokerTracker 4 Database Menu, but this assumes that PokerTracker 4 is accessable at the time. This option is not available in the Mac OS X version of PokerTracker 4 at this time, it is a Windows-only option.