MAT View Creation Performance Issue

Question

Hello Experts,
Below query is executing approximately in 1-3 sec.
select
COMMITMENT_ID,
FUNDING_RULE_ID,
reporting_year||'-'||reporting_period as RepPeriod,
GET_START_DAY_OF_PERIOD (FUNDING_RULE_ID, reporting_year, reporting_period) START_DAY_OF_PERIODt,
GET_END_DAY_OF_PERIOD(FUNDING_RULE_ID, reporting_year, reporting_period) END_DAY_OF_PERIOD
from
  (select
  COMMITMENT_ID,
  FR_ID as FUNDING_RULE_ID,
  COMT_START_DATE,
  --COMT_TERMINATION_DATE,
  GETREPYEARFROMDATE(COMT_START_DATE,FR_ID) as reporting_year,
  GETREPORTINGPERIOD(to_char(COMT_START_DATE, 'mm') ,FR_ID) as  reporting_period
  from
    select
    COMMITMENT_ID,
    COMT_START_DATE,
    --COMT_TERMINATION_DATE,
    COALESCE(CB_FUNDING_RULE_ID,NC_FUNDING_RULE_ID) FR_ID
    from
    (COMMITMENT_TABLE left outer join (CHILD_BENEFICIARY_TABLE left outer join FUNDING_RULE_TABLE a on
    a.FUNDING_RULE_ID = CB_FUNDING_RULE_ID )
    on COMT_BENEFICIARY_REF = CB_BENEFICIARY_REF
    left outer join (NON_CHILD_BENEFICIARY_TABLE left outer join FUNDING_RULE_TABLE b on
    b.FUNDING_RULE_ID = NC_FUNDING_RULE_ID)
    on
     COMT_BENEFICIARY_REF = NC_BENEFICIARY_REF)
The query is returning 4.5 lacks of rows.
I want to create a MAT view by using above query and refresh this on daily basis.
But the MAT view creation is taking more time near about 401sec (6.68min).
Why the MAT view is taking more time?
MAT_VIEW
CREATE MATERIALIZED VIEW "REP_PERIOD_START_END_DATE"
AS select
COMMITMENT_ID,
FUNDING_RULE_ID,
reporting_year||'-'||reporting_period as RepPeriod,
GET_START_DAY_OF_PERIOD (FUNDING_RULE_ID, reporting_year, reporting_period) START_DAY_OF_PERIODt,
GET_END_DAY_OF_PERIOD(FUNDING_RULE_ID, reporting_year, reporting_period) END_DAY_OF_PERIOD
from
  (select
  COMMITMENT_ID,
  FR_ID as FUNDING_RULE_ID,
  COMT_START_DATE,
  --COMT_TERMINATION_DATE,
  GETREPYEARFROMDATE(COMT_START_DATE,FR_ID) as reporting_year,
  GETREPORTINGPERIOD(to_char(COMT_START_DATE, 'mm') ,FR_ID) as  reporting_period
  from
    select
    COMMITMENT_ID,
    COMT_START_DATE,
    --COMT_TERMINATION_DATE,
    COALESCE(CB_FUNDING_RULE_ID,NC_FUNDING_RULE_ID) FR_ID
    from
    (COMMITMENT_TABLE left outer join (CHILD_BENEFICIARY_TABLE left outer join FUNDING_RULE_TABLE a on
    a.FUNDING_RULE_ID = CB_FUNDING_RULE_ID )
    on COMT_BENEFICIARY_REF = CB_BENEFICIARY_REF
    left outer join (NON_CHILD_BENEFICIARY_TABLE left outer join FUNDING_RULE_TABLE b on
    b.FUNDING_RULE_ID = NC_FUNDING_RULE_ID)
    on
     COMT_BENEFICIARY_REF = NC_BENEFICIARY_REF)
Is there any way to make the MAT view creation within 3 minutes?

Answer 1

CREATE MATERIALIZED VIEW "REP_PERIOD_START_END_DATE"
AS
with tab as
select /*+ materialize */ commitment_id,
                       comt_start_date,
                       --COMT_TERMINATION_DATE,
                       coalesce (cb_funding_rule_id, nc_funding_rule_id)
                          fr_id
                  from (      commitment_table
                           left outer join
                              (   child_beneficiary_table
                               left outer join
                                  funding_rule_table a
                               on a.funding_rule_id = cb_funding_rule_id)
                           on comt_beneficiary_ref = cb_beneficiary_ref
                        left outer join
                           (   non_child_beneficiary_table
                            left outer join
                               funding_rule_table b
                            on b.funding_rule_id = nc_funding_rule_id)
                        on comt_beneficiary_ref = nc_beneficiary_ref)
select commitment_id,
       funding_rule_id,
       reporting_year || '-' || reporting_period as repperiod,
       get_start_day_of_period (funding_rule_id,
                                reporting_year,
                                reporting_period)
          start_day_of_periodt,
       get_end_day_of_period (funding_rule_id,
                              reporting_year,
                              reporting_period)
          end_day_of_period
  from (select commitment_id,
               fr_id as funding_rule_id,
               comt_start_date,
               --COMT_TERMINATION_DATE,
               getrepyearfromdate (comt_start_date, fr_id) as reporting_year,
               getreportingperiod (to_char (comt_start_date, 'mm'), fr_id)
                  as reporting_period
          from tab);