ora-600 ktbdchk1: bad dscn

大批量dml操作时报错如下：
ora-600 ktbdchk1: bad dscn

metlink上有如下描述：
ORA-600 on UPDATE statement

========= Dump for incident 932331 (ORA 600 [ktbdchk1: bad dscn]) ========
----- Beginning of Customized Incident Dump(s) -----
[ktbdchk] -- ktbgcl4 -- bad dscn
dependent scn: 0x0013.dc0691c4 recent scn: 0x0013.a7fdc08a current scn: 0x0013.a7fdc08a
----- End of Customized Incident Dump(s) -----

*** 2012-10-08 00:55:43.199
dbkedDefDump(): Starting incident default dumps (flags=0x2, level=3, mask=0x0)
----- Current SQL Statement for this session (sql_id=9m8qjhtu2vj4r) -----
UPDATE SIEBEL.S_ORG_EXT BT
  SET (ACTIVE_FLG,
CONTRACT_VIS_FLG,
DISA_CLEANSE_FLG,
EVT_LOC_FLG,
FCST_ORG_FLG,
FUND_ELIG_FLG,
INCL_FLG,
INT_ORG_FLG,
PROSPECT_FLG,
PRTNR_FLG,

...

----- Call Stack Trace -----
    skdstdst <- ksedst1 <- ksedst <- dbkedDefDump <- ksedmp
       <- ksfdmp <- dbgexPhaseII <- dbgexExplicitEndInc <- dbgeEndDDEInvocatio <- nImpl
        <- dbgeEndDDEInvocatio <- ktbValidateDependen <- tScn <- ktbgcl1 <- tScn
         <- ktbgtl0 <- kdiins0 <- kdiinsp <- kauupd <- updrow
          <- qerupFetch <- updaul <- updThreePhaseExe <- 319 <- updexe
           <- opiexe <- kpoal8 <- opiodr <- ttcpip <- opitsk
            <- opiino <- opiodr <- opidrv <- sou2o <- opimai_real
             <- ssthrdmain <- main <- libc_start_main <- start

一般解决方式就是：
1 打psu；
2 修改隐含参数： "_ktb_debug_flags"=8（oracle建议 patch for bug 8895202 打后，再修改）