Gather Schema Statistics Completed with ORA-20001 Error in R12

Problem

Gather Schema statistics concurrent program completed with following error

+-----------------------------------------------------------+
Start of log messages from FND_FILE
+-----------------------------------------------------------+
In GATHER_SCHEMA_STATS , schema_name= ALL percent= 10 degree = 8 internal_flag= NOBACKUP
stats on table AQ$_WF_CONTROL_P is locked 
stats on table WF_CONTROL is locked 
Error #1: ERROR: While GATHER_TABLE_STATS:
object_name=GL.JE_BE_LINE_TYPE_MAP***ORA-20001: invalid column name or duplicate columns/column groups/expressions in method_opt***
Error #2: ERROR: While GATHER_TABLE_STATS:
object_name=GL.JE_BE_LOGS***ORA-20001: invalid column name or duplicate columns/column groups/expressions in method_opt***
Error #3: ERROR: While GATHER_TABLE_STATS:
object_name=GL.JE_BE_VAT_REP_RULES***ORA-20001: invalid column name or duplicate columns/column groups/expressions in method_opt***
+-----------------------------------------------------------+
End of log messages from FND_FILE
+-----------------------------------------------------------+

Solution

There are duplicate rows on FND_HISTOGRAM_COLS. Find out all duplicates and/or obsolete rows in FND_HISTOGRAM_COLS and delete one of them logged in as the applsys user.

1. Identify Duplicate Rows

select table_name, column_name, count(*)
from FND_HISTOGRAM_COLS
group by table_name, column_name
having count(*) > 1;

2. Use above results on the following SQL to delete duplicates

delete from FND_HISTOGRAM_COLS
where table_name = '&TABLE_NAME'
and  column_name = '&COLUMN_NAME'
and rownum=1;

You can get the updated query by running following.

select 'delete from FND_HISTOGRAM_COLS where table_name = '''||table_name||''' and column_name = '''||column_name||''' and rownum=1;' from FND_HISTOGRAM_COLS group by table_name, column_name having count(*) > 1;

3. Use following SQL to delete obsoleted rows

delete from FND_HISTOGRAM_COLS
where (table_name, column_name) in 
  (
   select hc.table_name, hc.column_name
   from FND_HISTOGRAM_COLS hc , dba_tab_columns tc
   where hc.table_name  ='&TABLE_NAME'
   and hc.table_name= tc.table_name (+)
   and hc.column_name = tc.column_name (+)
   and tc.column_name is null
  );

commit;

Reference:

11i - 12 Gather Schema Statistics fails with Ora-20001 errors after 11G database Upgrade (Doc ID 781813.1)