Oracle DBA Daily Experiences

Suspend a running process
SQL> oradebug setorapid 12
Unix process pid: 10932, image: oracle@localhost.localdomain (TNS V1-V3)
SQL> oradebug suspend
Statement processed.

Resume a process
SQL> oradebug resume
Statement processed.

If you have trace turned on a suspended and resume session you will see the following messages in the trace file.
FETCH #5:c=54992,e=55962,p=0,cr=2334,cu=0,mis=0,r=1,dep=1,og=1,tim=1249098751175228
EXEC #5:c=0,e=72,p=0,cr=0,cu=0,mis=0,r=0,dep=1,og=1,tim=1249098751175408
Received ORADEBUG command ‘suspend’ from process Unix process pid: 22990, image:
*** 2010-07-13 21:12:34.268
Received ORADEBUG command ‘resume’ from process Unix process pid: 22990, image:
FETCH #5:c=58991,e=32316703,p=0,cr=2334,cu=0,mis=0,r=1,dep=1,og=1,tim=1249098783492125
EXEC #5:c=0,e=71,p=0,cr=0,cu=0,mis=0,r=0,dep=1,og=1,tim=1249098783492321

Using stty one can set some of keys like backsapce, interrupt, suspend and kill.
$ stty -a # shows the current terminal settings
intr = ^C; quit = ^\; erase = ^?; kill = ^U; eof = ^D; eol = ; eol2 = ; start = ^Q;
stop = ^S; susp = ^Z; rprnt = ^R; werase = ^W; lnext = ^V; flush = ^O; min = 1; time = 0;

$ stty erase \^? # set backspace key for backspace
$ stty intr \^C # set Control-C for interrupt
$ stty susp \^Z # set Control-Z for suspend
$ stty kill \^U # set Control-U for kill