CREATE MV ON PREBUILT TABLE uses up all UNDO; why?

Hi,
We have a DW application with star schemas and a few MVs. Our MVs are on top of prebuilt tables as we "manually" manage the aggregations. Creation of most of the MV definitions over the prebuilt tables is OK: they take just a few hundred milliseconds as expected when only the data dictionary is updated. But there is one MV which takes a lot of time (hours) to create and eventually it fails when it used up all UNDO (no matter how much we extend UNDO). This does not make sense at all.
The facts and my observations:
- 10gR2 EE with Partitioning
- The problematic prebuilt table is range partitioned (by calendar week), no indexes. The problem-free prebuilt tables are also range partitioned (same logic) and have a bitmap index on the partition key column (DATE datatype).
- Base table is range partitioned (by calendar week) with indexes and an MV log that is used by a single Oracle-managed MV. MV log is assumed to be OK.
- Adding a bitmap index on the partition key column of the problematic table did not fix the issue.
- In schemas with the same application installed but with a small amount of data, the creation of this MV takes longer than the expected few hundred milliseconds, but it is under 10 minutes (mostly under 3 minutes). After the successful creation only the expected objects (table (partitions) and MV) can be seen in user_objects.
- MV creation worked for a while until amount of data in prebuilt table reached a certain size.
- The MV definition is correct: same object name and same column structure as prebuilt table, MV is then used in queries producing correct results.
- When the CREATE MV ON PREBUILT TABLE is being executed, all available UNDO is allocated until there is no more space in tablespace.
- TEMP does not seem to be used
- No new object or segment can be seen.
- Execution of CREATE MV is done in parallel (32 PXs); all I could observe is that there was a "+db file sequential read+" from the data tablespace and 32 "+PX Deq Credit: send blkd+" operations
- Execution plan is not available
- Nothing related is in v$session_longops
Using UNDO would suggest some DML operation, most likely INSERTs but there is no need for those. All data is ready/available, all we need is the MV definition on the top of the prebuilt table.
So, why does CREATE MV ON PREBUILT TABLE needs UNDO ? What does it do and why?
Thank you for your help,
Szilard
PS: I am not sure if this category is the best place for this thread, but the categories in BI/DW were too specific.

Got the below error ORA-10980 in the tkprof output file
The following statement encountered a error during parse:
SELECT --+ STAR_TRANSFORMATION FACT( f_on_portal_churn )
c.brand_name
, c.subportal_name
, c.date_id
, c.msisdn
, c.personalized
, c.device_id
, c.activity_status_id
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Error encountered: ORA-10980
=======================================

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