Hi,
I've got this error 2, 3 times a day, I'm running Oracle 8.1.6 on NT 4.0 SP 6.
The trace file is like this: ORA0021.TRC
Dump file D:\Oracle\admin\hs\udump\ORA00221.TRC
Wed May 15 19:49:52 2002
ORACLE V8.1.6.3.0 - Production vsnsta=0
vsnsql=e vsnxtr=3
Windows NT Version 4.0 Service Pack 6, CPU type 586
Oracle8i Release 8.1.6.3.0 - Production
JServer Release 8.1.6.3.0 - Production
Windows NT Version 4.0 Service Pack 6, CPU type 586
Instance name: hs

Redo thread mounted by this instance: 1

Oracle process number: 17

Windows thread id: 221, image: ORACLE.EXE


*** 2002-05-15 19:49:52.687
*** SESSION ID:(26.1827) 2002-05-15 19:49:52.312
FATAL ERROR IN TWO-TASK SERVER: error = 12571
*** 2002-05-15 19:49:52.781
ksedmp: internal or fatal error
Current SQL statement for this session:
SELECT UNIQUE
1 UNIONPART,
..........
ORDER BY SERVEDATESTR, ROOMLOCDECODE, UPPERNAME, PATRONID, MEALORDER, RECCATDECODE
*** 2002-05-15 19:50:13.500
----- Call Stack Trace -----
calling call entry argument values in hex
location type point (? means dubious value)
-------------------- -------- -------------------- ----------------------------
_ksedmp+a8 CALLrel _ksedst+0
50FE4F0
_opitsk+f1c CALLrel _ksedmp+0 2
_opiino+4fd CALLrel _opitsk+0 0
_opiodr+506 CALLreg 00000000 3C 4
450FFBFC
_opidrv+384 CALLrel _opiodr+0 3C 4
450FFBFC
0
_sou2o+19 CALLrel _opidrv+0
_opimai+10c CALLrel _sou2o+0
_OracleThreadStart@4+49f CALLrel _opimai+0 2
450FFE78
77F04EED CALLreg 00000000
----- Argument/Register Address Dump -----
Argument/Register addr=450fe4f0.
Dump of memory from 0x450FE4B0 to 0x450FE5F0
450FE4B0 00000003 00000000 6552210E 00000033 [.........!Re3...]
450FE4C0 00000000 00000003 450FE485 00000000 [...........E....]
..........

Please, if someone could help me!!!
Thanks