If you are experiencing the following issue your fix is available with the 6.5.0e release. Even if you are not experiencing this issue it is recommended to go ahead and apply this patch according to my VMware TAM.
vCenter Server 6.5 might fail with an error of the type ERROR: duplicate key value violates unique constraint “pk_vpx_guest_disk”
The vpxd service on vCenter Server 6.5 might intermittently fail with the following error stack in the log files:
YYYY-MM-DDT00:01:24.342Z error vpxd[7F8DD228C700] [Originator@6876 sub=Default opID=HB-host-476@72123-38e1cc31] [VdbStatement] >SQLError was thrown: “ODBC error: (23505) – ERROR: duplicate key value violates unique constraint “pk_vpx_guest_disk”;
–> Error while executing the query” is returned when executing SQL statement “INSERT INTO VPX_GUEST_DISK (VM_ID, PATH, CAPACITY, >FREE_SPACE) VALUES (?, ?, ?, ?)”
The VMware vCenter Server 6.5 vpxd log files are located in the %ALLUSERSPROFILE%\VMWare\vCenterServer\logs\vmware-vpx folder.
The VMware vCenter Server Appliance vpxd 6.5 log files are located in the /var/log/vmware/vmware-vpx folder.
The error occurs because of a database key violation for the GuestDisks updates, causing duplicate entries in the table.
This issue is fixed in this release.
As The Geeks Learn 