Parallelism

While testing Oracle 11.2.0.2 (on Red Hat Enterprise Linux), I recently bumped up against a problem with stats collections using DEGREE > 1 that results in an ORA-600.

20:56:41 SQL> BEGIN DBMS_STATS.GATHER_TABLE_STATS('TR_OWNER','TR_POL', Estimate_Percent=>dbms_stats.AUTO_SAMPLE_SIZE, method_opt=>'FOR ALL INDEXED COLUMNS SIZE AUTO',cascade=>FALSE, Degree=>dbms_stats.AUTO_DEGREE); END;
20:56:41   2  /
BEGIN DBMS_STATS.GATHER_TABLE_STATS('TR_OWNER','TR_POL', Estimate_Percent=>dbms_stats.AUTO_SAMPLE_SIZE, method_opt=>'FOR ALL INDEXED COLUMNS SIZE AUTO',cascade=>FALSE, Degree=>dbms_stats.AUTO_DEGREE); END;
*
ERROR at line 1:
ORA-20011: Approximate NDV failed: ORA-12801: error signaled in parallel query
server P024, instance db100.srv.com:TRXTPLT2 (2)
ORA-00039: error during periodic action
ORA-00600: internal error code, arguments: [17114], [0x2AE3C33489B8], [], [],
[], [], [], [], [], [], [], []