IT18502: DB2 MAY RETURN SQLCODE:-901 OR RETURN WRONG RESULTS ON QUERIES WITH PLANS THAT INVOVLE SORT ON AN ENCRYPTED DATABASE

DB2 Version 11.1 Mod 2 Fix Pack 2 for Linux, UNIX, and Windows
Db2 Version 11.1 Mod2 Fix Pack2 iFix001 for Linux, UNIX, and Windows
Db2 Version 11.1 Mod2 Fix Pack2 iFix002 for Linux, UNIX, and Windows
Db2 Version 11.1 Mod 3 Fix Pack 3 for Linux, UNIX, and Windows
Db2 Version 11.1 Mod3 Fix Pack3 iFix001 for Linux, UNIX, and Windows
Db2 Version 11.1 Mod3 Fix Pack3 iFix002 for Linux, UNIX, and Windows
Db2 Version 11.1 Mod4 Fix Pack4 iFix001 for Linux, UNIX, and Windows

APAR status

• Closed as program error.

Error description

• DB2 may return sqlcode -901 or wrong results or hit a
  panic/crash
  when running a query which contains a sort which spilled to
  disk.
  
  Users may see one of the following sqlcodes:
  
  SQL0901N  The SQL statement or command failed because of a
  database system
  error. (Reason "outer > inner, input out of order".)
  SQLSTATE=58004
  
  SQL0901N  The SQL statement or command failed because of a
  database system
  error. (Reason "bad outer compare".)  SQLSTATE=58004
  
  Wrong results can manifest in either invalid data values coming
  back to the user, or aggregation generating duplicate rows, when
  not expected.
  
  Sample stack when hitting the -901 sqlcode:
  0x00007FFFF117665D sqlrrSqlCode + 0x00dd
      (/home/sbhalla/sqllib/lib64/libdb2e.so.1)
  0x00007FFFF16A5B49 _Z8sqlri_mjP8sqlrr_cb + 0x0729
      (/home/sbhalla/sqllib/lib64/libdb2e.so.1)
  0x00007FFFF163AB08 _Z15sqlriSectInvokeP8sqlrr_cbP12sqlri_opparm
  + 0x04f8
      (/home/sbhalla/sqllib/lib64/libdb2e.so.1)
  0x00007FFFF10A0C77
  _Z21sqlrr_subagent_routerP8sqeAgentP12SQLE_DB2RA_T + 0x0d87
      (/home/sbhalla/sqllib/lib64/libdb2e.so.1)
  0x00007FFFEEC35B8D address: 0x00007FFFEEC35B8D ; dladdress:
  0x00007FFFE990A000 ; offset in lib: 0x000000000532BB8D ;
      (/home/sbhalla/sqllib/lib64/libdb2e.so.1)
  0x00007FFFEEC3447A _Z21sqleProcessSubRequestP8sqeAgent + 0x03da
      (/home/sbhalla/sqllib/lib64/libdb2e.so.1)
  0x00007FFFEEC67C7B _ZN8sqeAgent6RunEDUEv + 0x05ab
      (/home/sbhalla/sqllib/lib64/libdb2e.so.1)
  0x00007FFFF2426DD6 _ZN9sqzEDUObj9EDUDriverEv + 0x0116
      (/home/sbhalla/sqllib/lib64/libdb2e.so.1)
  0x00007FFFF0A76AF8 sqloEDUEntry + 0x0578
      (/home/sbhalla/sqllib/lib64/libdb2e.so.1)
  0x00007FFFF7BC7806 address: 0x00007FFFF7BC7806 ; dladdress:
  0x00007FFFF7BC0000 ; offset in lib: 0x0000000000007806 ;
      (/lib64/libpthread.so.0)
  0x00007FFFE849464D clone + 0x006d
      (/lib64/libc.so.6)
  
  A stack for instance crash would look like the following:
  0x00007F4E28DD54B7 _Z13sqlzeDumpFFDCP8sqeAgentjP5sqlcai + 0x00a7
          (/db2home/db2edwp1/sqllib/lib64/libdb2e.so.1)
  0x00007F4E28DD4B80
  _Z11sqlzeMapZrcP8sqeAgentjmjP5sqlcaiPK12sqlzeContextb + 0x0940
          (/db2home/db2edwp1/sqllib/lib64/libdb2e.so.1)
  0x00007F4E27B26CF5 _Z11sqlrrMapZrcP8sqlrr_cbjmi + 0x0035
          (/db2home/db2edwp1/sqllib/lib64/libdb2e.so.1)
  0x00007F4E280C5A5C _Z17sqlriPrefetchRIDsP8sqlrr_cbP8sqlri_lfl +
  0x042c
          (/db2home/db2edwp1/sqllib/lib64/libdb2e.so.1)
  0x00007F4E280C3956 _Z14sqlriListFetchP8sqlrr_cb + 0x0466
          (/db2home/db2edwp1/sqllib/lib64/libdb2e.so.1)
  0x00007F4E28134AD0 _Z9sqlrihsjnP8sqlrr_cb + 0x0690
          (/db2home/db2edwp1/sqllib/lib64/libdb2e.so.1)
  0x00007F4E28134AD0 _Z9sqlrihsjnP8sqlrr_cb + 0x0690
          (/db2home/db2edwp1/sqllib/lib64/libdb2e.so.1)
  0x00007F4E28134AD0 _Z9sqlrihsjnP8sqlrr_cb + 0x0690
          (/db2home/db2edwp1/sqllib/lib64/libdb2e.so.1)
  0x00007F4E27FECF18 _Z15sqlriSectInvokeP8sqlrr_cbP12sqlri_opparm
  + 0x04f8
          (/db2home/db2edwp1/sqllib/lib64/libdb2e.so.1)
  0x00007F4E27A52387
  _Z21sqlrr_subagent_routerP8sqeAgentP12SQLE_DB2RA_T + 0x0d87
          (/db2home/db2edwp1/sqllib/lib64/libdb2e.so.1)
  0x00007F4E255E684D address: 0x00007F4E255E684D ; dladdress:
  0x00007F4E202BB000 ; offset in lib: 0x000000000532B84D ;
          (/db2home/db2edwp1/sqllib/lib64/libdb2e.so.1)
  0x00007F4E255E513A _Z21sqleProcessSubRequestP8sqeAgent + 0x03da
          (/db2home/db2edwp1/sqllib/lib64/libdb2e.so.1)
  0x00007F4E2561893B _ZN8sqeAgent6RunEDUEv + 0x05ab
          (/db2home/db2edwp1/sqllib/lib64/libdb2e.so.1)
  0x00007F4E28DD5A16 _ZN9sqzEDUObj9EDUDriverEv + 0x0116
          (/db2home/db2edwp1/sqllib/lib64/libdb2e.so.1)
  0x00007F4E274289A8 sqloEDUEntry + 0x0578
          (/db2home/db2edwp1/sqllib/lib64/libdb2e.so.1)
  0x0000003387A07AA1 address: 0x0000003387A07AA1 ; dladdress:
  0x0000003387A00000 ; offset in lib: 0x0000000000007AA1 ;
          (/lib64/libpthread.so.0)
  0x00000033872E893D clone + 0x006d
          (/lib64/libc.so.6)
  

Local fix

• If it is possible to force a different plan that avoids sort,
  this will avoid the issue.
  

Problem summary

• ****************************************************************
  * USERS AFFECTED:                                              *
  * ALL                                                          *
  ****************************************************************
  * PROBLEM DESCRIPTION:                                         *
  * See Error Description                                        *
  ****************************************************************
  * RECOMMENDATION:                                              *
  * Install this fix                                             *
  ****************************************************************
  

Problem conclusion

• See Error Description
  

Temporary fix

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

• APAR is sysrouted TO one or more of the following:

  IT18514 IT18515

Fix information

• Fixed component name

  DB2 FOR LUW

• Fixed component ID

  DB2FORLUW

Applicable component levels