Trace Components 
The following table contains the trace components of the SAP kernel together with their one-character abbreviation. You see these letters in each line of the trace file and you need them if you want to determine using parameter rdisp/TRACE_COMPS which components are to write traces.
More information: rdisp/TRACE* Parameters
Component Abbreviation in Trace File |
Component (Selection using SM50 or SM04) |
|---|---|
M |
Task handler |
A |
ABAP Processor |
Y |
Screen Processor |
X |
Extended memory |
E |
Lock management (enqueue) |
I |
IPC (inter process communication) |
S |
Print (spool) |
N |
Secure Network Communication, (SNC) |
T |
Debug system |
L |
Background |
B |
Database |
C |
Database (DBSL) |
P |
Paging |
R |
Rolling |
D |
Diag processor |