The execution status of the Process instances are based on the different phases that an instance can undergo during the execution life cycle. These execution status are maintained by the Process Server in the Process Server Database. When the BPD instanc table is queried, it will return the status as integer values.
1 - The Process instance is currently active
2 - The Process instance has completed or Finished
3 - The Process instance has failed due error in execution
4 - The Process instance has been terminated(abort)
5 - The Process instance could not Start
8 - The Process instance was suspended
The above were the corresponding status to the Integer values.