昨天朋友求助，在INSERT的时候，LOB字段遇到了600错误，数据库版本10.2.0.4.0 for AIX，错误信息如下：

Errors in file /ora/oracle/admin/xcky/udump/xcky_ora_827438.trc:
ORA-00600: internal error code, arguments: [25027], [6], [0], [], [], [], [], []

Trace信息如下：

ksedmp: internal or fatal error
ORA-00600: internal error code, arguments: [25027], [6], [0], [], [], [], [], []
No current SQL statement being executed.
----- Call Stack Trace -----
calling              call     entry                argument values in hex      
location             type     point                (? means dubious value)     
-------------------- -------- -------------------- ----------------------------
ksedst+001c          bl       ksedst1              088484844 ? 041184844 ?
ksedmp+0290          bl       ksedst               104A2C670 ?
ksfdmp+0018          bl       03F263A4             
kgeriv+0108          bl       _ptrgl               
kgesiv+0080          bl       kgeriv               100A78718 ? 00600CEE1 ?
                                                   FFFFFFFFFFF4340 ? 11022AC30 ?
                                                   000000042 ?
ksesic2+0060         bl       kgesiv               000000000 ? FFFFFFFFFFF3960 ?
                                                   700000010013BD0 ?
                                                   700000010018078 ? 110000FD8 ?
krtd2abh+040c        bl       ksesic2              61C3000061C3 ? 000000000 ?
                                                   000000006 ? 000000000 ?
                                                   000000000 ? 000000320 ?
                                                   000024000 ? 000000001 ?
kcbgcur+1c7c         bl       krtd2abh             102581B3C ? 1052DEFC0 ?
                                                   000000042 ? 00911B616 ?
                                                   00911B616 ?
ktspgfblk3+035c      bl       kcbgcur              FFFFFFFFFFF3960 ? 104BD1834 ?
                                                   D610122010 ? 000000000 ?
ktsplbfmb+0724       bl       03F261CC             
ktsplbrecl+0388      bl       ktsplbfmb            FFFFFFFFFFFFFFFF ?
                                                   00000000A ? 000000000 ?
                                                   000000004 ? 000000000 ?
                                                   0000000FF ? 000000000 ?
                                                   000000002 ?
ktspgsp_cbk1+0714    bl       03F24A70             
kdlgsp_init+02d0     bl       ktspgsp_cbk1         000002000 ? 000000000 ?
                                                   000000000 ? 000000000 ?
                                                   FFFFFFFFFFF43D0 ? 000000001 ?
                                                   FFFFFFFFFFF5368 ? 104D1E6E0 ?
kdl_write1+1274      bl       kdlgsp_init          FFFFFFFFFFF5368 ? 1105341F8 ?
                                                   FFFFFFFFFFF9168 ?
koklwrite+06a8       bl       kdl_write1           FFFFFFFFFFF9168 ? 000000000 ?
                                                   FFFFFFFFFFF7A88 ? 000000000 ?
                                                   FFFFFFFFFFF95B8 ? 1101E6690 ?
                                                   FFFFFFFFFFF7A72 ? 000000000 ?
kpolob+0ed0          bl       03F25528             
opiodr+0ae0          bl       _ptrgl               
ttcpip+1020          bl       _ptrgl               
opitsk+1124          bl       01F96230             
opiino+0990          bl       opitsk               000000000 ? 000000000 ?
opiodr+0ae0          bl       _ptrgl               
opidrv+0484          bl       01F9507C             
sou2o+0090           bl       opidrv               3C02D992DC ? 44065F000 ?
                                                   FFFFFFFFFFFF8A0 ?
opimai_real+01bc     bl       01F929F4             
main+0098            bl       opimai_real          000000000 ? 000000000 ?
__start+0098         bl       main                 000000000 ? 000000000 ?
 
--------------------- Binary Stack Dump ---------------------

通过MOS发现，该问题系数据库的BUG(bug 13869187)，以下是MOS上对该BUG的说明及给出的解决方法。

SYMPTOMS

Insert into table with lob fails with ora-600[25027][x][0] where x is ts# for the tablespace that has the lob.

Tracefile shows the stack function similar to:

krtd2abh kcbgcur ktspgfblk3 ktsplbfmb ktsplbrecl ktspgsp_main kdlgsp_init kdl_write1 kdlf_write koklicbf koklcre

CAUSE

The cause of this error can be LOST IO which may cause other errors like ORA-600 [kdlpdba:kcbz_objdchk] during INSERT.

The problem described in bug 13869187 is because a Block is marked as Formatted in the ASSM metadata L1 bitmap block but the block is unformatted for the LOB segment.

The 3rd argument may not be always 0 (zero) as the problem is that if the block is unformatted, Oracle still tries to locate a pdba assuming that the block is formatted and that pdba offset may be zero when the block is empty (affected block has never formatted:block flag contains 1 – KCBHFNEW and type is zero). If the block is formatted for a former dropped object, then the argument can be different than zero.

DBMS_SPACE_ADMIN.ASSM_SEGMENT_VERIFY with verify_option=>DBMS_SPACE_ADMIN.SEGMENT_VERIFY_SPECIFIC and
attrib=>DBMS_SPACE_ADMIN.BITMAPS_CHECK; however it may be canceled when visiting the first problematic block; thus may not identify all affected blocks.

Syntax example of executing the above procedure:

exec DBMS_SPACE_ADMIN.ASSM_SEGMENT_VERIFY(‘SYS’,’T_C2_LOB’,’LOB’,null,DBMS_SPACE_ADMIN.SEGMENT_VERIFY_SPECIFIC,DBMS_SPACE_ADMIN.BITMAPS_CHECK)

For more details reference Bug 18607613

SOLUTION

The error is fixed by:

recreating the table using exp-drop-import.

OR

Move the lob in a new tablespace.

Alter table move lob(&lob_column) store as (tablespace &tbsp);

@OR

@If the table or the lob are too big taking too long to recreate PATCH 18024115 could be installed, if available, and enabled by

@alter system set “_fix_control”=’18024115:ON’;

@See Doc ID 18024115.8

MOS给了3种解决方法，一种是以逻辑方式导出报错的表的数据，然后重新创建表后，再把数据导入。二是通过MOVE的方式移动LOB段。三是通过打补丁的方式。目前ORACLE早已不再支持10g版本的数据库，建议升级数据库到11.2.0.4。

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