Error while enabling query rewrite on cube

Question

Hi
Trying to enable query rewrite option for OLAP cube throws below error message :
Your metadata changes have been saved, with the following errors
Invalid Metadata Objects:
Invalid Object "FUSION.FLINE_STATUS_CUBE2": "CREATE MATERIALIZED VIEW "FUSION"."CB$FLINE_STATUS_CUBE2"
ORGANIZATION CUBE ON FUSION.DOO_STATUS (
FACT "FLINE_STATUS_CUBE2_STORED"("FLINE_STATUS_CUBE2_MEASURE_DIM" 'SYS_COUNT') IS "SYS_COUNT",
FACT "FLINE_STATUS_CUBE2_STORED"("FLINE_STATUS_CUBE2_MEASURE_DIM" 'TOTAL_QUANTITY') IS "TOTAL_QUANTITY",
FACT "FLINE_STATUS_CUBE2_STORED"("FLINE_STATUS_CUBE2_MEASURE_DIM" 'TOTAL_PRICE') IS "TOTAL_PRICE",
DIMENSION "WAREHOUSE1" IS "WAREHOUSE1" .............................................
ORA-30353: expression not supported for query rewrite
There are no issues with loading/viewing data from cube.
Any pointers on what could be going wrong herel.
Thanks
RaviKishore

Answer 1

In the context of an OLAP cube the offending expression will be part of the cube's mapping. As already pointed out, there are a number of functions that aren't compatible. Here is the oracle documentation for the error.
ORA-30353 expression not supported for query rewrite
Cause: The SELECT clause referenced UID, USER, ROWNUM, SYSDATE, CURRENT_TIMESTAMP, MAXVALUE, a sequence number, a bind variable, correlation variable, a set result, a trigger return variable, a parallel table queue column, collection iterator, a non-deterministic date format token RR, etc.
Action: Remove the offending expression or disable the REWRITE option on the materialized view.
The most common cause in my experience is handling dates with either TO_DATE or TO_CHAR functions. If these functions do not have an explicit date format, then you will hit this error.