Reference from :
Oradebug is a command that can be executed from (or in Oracle 8i and lower releases) to display or dump diagnostics information.
Execute the "ORADEBUG HELP" command to obtain a list of valid ORADEBUG commands.
It looks like one can change memory locations with the ORADEBUG POKE command. Anyone brave enough to test this one for us?
Examples
Look at these oradebug examples:
Trace SQL statements with bind variables:
SQL> oradebug setospid 10121
Oracle pid: 91, Unix process pid: 10121, image: oracleorcl
SQL> oradebug EVENT 10046 trace name context forever, level 12
Statement processed.
SQL> ! vi /app/oracle/admin/orcl/bdump/ora_10121.trc
Trace Process Statistics:
SQL> oradebug setorapid 2
Unix process pid: 1436, image: ora_pmon_orcl
SQL> oradebug procstat
Statement processed.
SQL> oradebug TRACEFILE_NAME
/app/oracle/admin/orcl/bdump/pmon_1436.trc
List semaphores and shared memory segments in use:
SQL> oradebug ipc
Dump Error Stack:
SQL> oradebug setospid
SQL> oradebug event immediate trace name errorstack level 3
Dump DLM locks:
SQL> oradebug lkdebug -a convlock
SQL> oradebug lkdebug -a convres
SQL> oradebug lkdebug -r (i.e 0x8066d338 from convres dump)
try in my env:
SQL> select addr, pid, spid, program from v$process;
ADDR PID SPID PROGRAM
-------- ---------- ------------ ------------------------------------------------
38D1ED68 1 PSEUDO
38D1F31C 2 3041 oracle@milo.com (PMON)
38D1F8D0 3 3043 oracle@milo.com (PSP0)
38D1FE84 4 3045 oracle@milo.com (MMAN)
38D20438 5 3047 oracle@milo.com (DBW0)
38D209EC 6 3049 oracle@milo.com (LGWR)
38D20FA0 7 3051 oracle@milo.com (CKPT)
38D21554 8 3053 oracle@milo.com (SMON)
38D21B08 9 3055 oracle@milo.com (RECO)
38D220BC 10 3057 oracle@milo.com (MMON)
38D22670 11 3059 oracle@milo.com (MMNL)
38D22C24 12 3061 oracle@milo.com (TNS V1-V3)
38D231D8 13 3063 oracle@milo.com (ARC0)
38D2378C 14 3065 oracle@milo.com (ARC1)
38D23D40 15 3203 oracle@milo.com (q001)
38D242F4 16 3069 oracle@milo.com (QMNC)
38D248A8 17 3211 oracle@milo.com (q002)
38D25410 19 3081 oracle@milo.com (q000)
18 rows selected.
SQL> oradebug setospid 3069
Oracle pid: 16, Unix process pid: 3069, image: oracle@milo.com (QMNC)
SQL> oradebug procstat
Statement processed.
SQL> oradebug TRACEFILE_NAME
/u01/app/oracle/admin/liuzhou/bdump/liuzhou_qmnc_3069.trc
SQL>
SQL>
SQL> oradebug setorapid 2
Unix process pid: 3041, image: oracle@milo.com (PMON)
SQL> oradebug procstat
Statement processed.
SQL> oradebug TRACEFILE_NAME
/u01/app/oracle/admin/liuzhou/bdump/liuzhou_pmon_3041.trc
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