SQL> oradebug peek 0x2F8EA34 16
[2F8EA34, 2F8EA44) = 78797A00 4546494C 455F4944 454E5449
SQL> oradebug setospid 5701
Oracle pid: 13, Unix process pid: 5701, image: oracle@dbvrfy1 (TNS V1-V3)
SQL> oradebug poke 0x2F8EA34 3 'XYZ'
ORA-01858: a non-numeric character was found where a numeric was expected
SQL> oradebug poke 0x2F8EA34 1 88
BEFORE: [2F8EA34, 2F8EA38) = 29004C53
AFTER:  [2F8EA34, 2F8EA38) = 58004C53
SQL> !ls -lt | head
total 120890
-rw-r-----   1 oracle   dba        99488 Jan 24 03:13 ectest9i_ora_5632_xyz.trc
-rw-r-----   1 oracle   dba       100017 Jan 24 03:11 ectest9i_ora_5632_ABCEFG.trc
-rw-r-----   1 oracle   dba          754 Jan  7 16:26 ectest9i_ora_9802.trc
-rw-r-----   1 oracle   dba          754 Jan  6 18:55 ectest9i_ora_2943.trc
-rw-r-----   1 oracle   dba          822 Jan  5 23:50 ectest9i_ora_27148.trc
-rw-r-----   1 oracle   dba            0 Jan  5 23:47 ectest9i_ora_26854.trc
-rw-r-----   1 oracle   dba         1845 Nov 17 17:00 ectest9i_ora_7881.trc
-rw-r-----   1 oracle   dba          756 Oct 21 22:26 ectest9i_ora_18192.trc
-rw-r-----   1 oracle   dba         1826 Oct 10 20:56 ectest9i_ora_8057.trc

SQL> oradebug dump global_area 1
Statement processed.
SQL> !