Query tuning - oracle 11g

Question

Hi all,
Query executes for more 1.5 hours. fetches the data from a remote database. more than million records.
any suggestions to tune the query?
Explain Plan
CREATE TABLE STATEMENT  ALL_ROWSCost: 3,777  Bytes: 1,161,660  Cardinality: 15,285                      
     5 LOAD AS SELECT hcl_delta_TMP_2                
          4 NESTED LOOPS  Cost: 3,768  Bytes: 1,161,660  Cardinality: 15,285            
               2 SORT UNIQUE  Cost: 1  Bytes: 693  Cardinality: 99       
                    1 INDEX FULL SCAN INDEX (UNIQUE) DELTA_REASON_CODES_PK Cost: 1  Bytes: 693  Cardinality: 99 
               3 REMOTE REMOTE SERIAL_FROM_REMOTE PSM_LIB_LOG_R RMDB Cost: 74  Bytes: 10,626  Cardinality: 154       
Query:
CREATE TABLE hcl_delta_tmp_2 AS
SELECT
'hcl' AS heritage,
load_dt,
process_dt,
update_status_cd,
loan_number,
lib_date,
lib_time,
lib_code,
lib_user_id,
lib_log_key_date_time
FROM psm_lib_log_r@RMDB a
WHERE a.process_dt >= TO_DATE('01/01/2010','MM/DD/YYYY') AND
a.update_status_cd NOT IN( 'P' ) AND
a.lib_code IN
SELECT TRIM(delta_code) AS delta_code
FROM delta_reason_codes
Delta code column is a primary key in table delta_reason_codes: DELTA_REASON_CODES_PKVersion : Oracle Database 11g Enterprise Edition Release 11.1.0.7.0 - 64bit Production
thanks.

Answer 1

I think I am getting conflicting information about how many rows are in the remote table.
First we read that the remote table has more than 10 million records and then we read that applying this where clause WHERE a.process_dt >= TO_DATE('01/01/2010','MM/DD/YYYY')
  AND a.update_status_cd NOT IN ('P') Results in that will be too many records, more than 10 millions.What are the total number of rows in the remote table?
How many rows match the date condition by itself?
How many match the status code condition by itself?
How many match the lib_code condition by itself?
How many rows match all conditions (the number returned by the query)?
Sorry, but I am just trying clear up any confusion here.