Interesting Error ORA-600 I faced the other day….

SQL> exec DBMS_STATS.FLUSH_DATABASE_MONITORING_INFO;
BEGIN DBMS_STATS.FLUSH_DATABASE_MONITORING_INFO; END;

*
ERROR at line 1:
ORA-00600: internal error code, arguments: [qosdExpStatRead: expcnt mismatch],
[65562], [26], [1144616], [1], [], [], [], [], [], [], []
ORA-06512: at “SYS.DBMS_STATS”, line 2141
ORA-06512: at “SYS.DBMS_STATS”, line 43486
ORA-06512: at line 1

Oracle database export datapump fails with below errors:

DDE: Problem Key ‘ORA 600 [qosdExpStatRead: expcnt mismatch]’ was flood controlled (0x4) (incident: 2017148)
ORA-00600: internal error code, arguments: [qosdExpStatRead: expcnt mismatch], [65562], [26], [1144616], [1], [], [], [], [], [], [], []
2025-07-29T11:33:58.617971+03:00
Incident 2017643 created, dump file: /oraclex/oradbp25/diag/rdbms/oradbp25/oradbp25/incident/incdir_2017643/oradbp25_dw00_3988067_i2017643.trc
ORA-00600: internal error code, arguments: [qosdExpStatRead: expcnt mismatch], [65562], [26], [1144616], [1], [], [], [], [], [], [], []
ORA-06512: at “SYS.DBMS_STATS”, line 2141
ORA-06512: at “SYS.DBMS_STATS”, line 57633
ORA-06512: at “SYS.DBMS_STATS”, line 57866
ORA-06512: at “SYS.KUPW$WORKER”, line 30029
ORA-06512: at “SYS.KUPW$WORKER”, line 3503
ORA-06512: at “SYS.KUPW$WORKER”, line 13746
ORA-06512: at “SYS.KUPW$WORKER”, line 2439
ORA-06512: at line 2

SOLUTION/FIX:

SQL> alter system set “_fix_control”=’31143146:on’,’32005394:on’ scope=both;

of course, its highly recommended to open a case with ORACLE.