Esxi og vCenter
Disclaimer: describes vcenter 6.0.0 (b 3271482) - it may vary for other versions ?
vcenter uses an embedded postgresql installation. Binaries are located in /opt/vmware/vpostgres/current/bin - data and config files are located in /storage/db/vpostgres/
On installation vCenter sets a number of config overrides in <datadir>/postgresql.conf.auto - pay attention to
temp_buffers - they might be set lower than postgresql default values (which is quite silly imho.) which will limit performance of postgresql - espesically when querying performance counters.
start psql client with
/opt/vmware/vpostgres/current/bin/psql -h localhost -U postgres