We execute very frequently SQL on the table – FND_CONCURRENT_REQUESTS to get the details on the Concurrent details to analysis and know the parameters and other details but not sure if we actually have details on all  Status Codes and Phase Codes getting used in the table – FND_CONCURRENT_REQUESTS

MEANING FOR THE PHASE_CODE COLUMN VALUES:
C Completed
I Inactive
P Pending
R Running

MEANING FOR THE STATUS_CODE COLUMN VALUES:
A Waiting
B Resuming
C Normal
D Cancelled
E Error
F Scheduled
G Warning
H On Hold
I Normal
M No Manager
Q Standby
R Normal
S Suspended
T Terminating
U Disabled
W Paused
X Terminated
Z Waiting