rdisp/wp_no_vb2 is a SAP Parameter attribute which is used to control Number of update work processes for V2 information. This is available within R/3 SAP systems depending on the version and release level.
Below is the standard documentation available and a few details of the attributes values .
Number of V2 work processes (type UP2) on the instance. V2 work
processes perform the update tasks (statistics, and so on..) that are
not time-critical. If no V2 work process is configured, these tasks are
performed by V1 work processes (Upd).
See SAP Parameter Documentation for full SAP documentation for this profile parameter.