Exchange partition taking so long?

Hello

Oracle 11.1.0.7 version.

Why partition exchange took 10 minutes longer?

Here is my code

Table TAB is siloed single list

 CREATE OR REPLACE PROCEDURE load_tab;
   IS
      
      starttime   NUMBER;
      endtime     NUMBER;
      BEGIN
 BEGIN     


EXECUTE IMMEDIATE 'TRUNCATE TABLE TAB_TEMP;'

-- Dropping the index on temp table

 EXECUTE IMMEDIATE 'DROP INDEX TAB_TEMP_IDX01';
 
 BEGIN
 INSERT /*+ append */ INTO TAB_TEMP
 Select col1,col2,...coln from table1@DBLINK1,table2@DBLINK1,table3@DBLINK1 where join conditions;
 
 commit;
 END;
 
 EXECUTE IMMEDIATE 'CREATE INDEX TAB_TEMP_IDX01 ON TAB_TEMP
 (COL1)
 NOLOGGING
 TABLESPACE CSP_INDX
PARALLEL';
 
 
  Gathering stats on temp table;
 
 
 EXECUTE IMMEDIATE 'TRUNCATE TABLE TAB';
 
  starttime := SYS.DBMS_UTILITY.get_time;


 EXECUTE IMMEDIATE 'ALTER TABLE TAB  EXCHANGE PARTITION p1  WITH TABLE TAB_TEMP  WITHOUT VALIDATION UPDATE GLOBAL INDEXES';

  endtime := SYS.DBMS_UTILITY.get_time;
  
  
  logging total time taken for partition exchange on a log table ((endtime-statrtime)/100));


EXECUTE IMMEDIATE 'TRUNCATE TABLE TAB_TEMP';


EXCEPTION Block;

END;

END load_tab;

Please let me know why partiton Exchange taking so long? here a few times it takes 30 minutes and some time 10-15 minutes.

I was under the impression that the exchange of partion is nothing but the update of the data dictionary. Please clarify my doubt?

Thank you
Mike

If you don't have a comprehensive index on the partition table, but only local indexes, then more of the optimal approach is:

(1) create the staging table (similar to the partition table)

(2) double local indexes on the table to partition in the staging table

(3) an exchange of partition table using alter table... swap partition.. with table... including the index without validation

Such an exchange of partition must be second - as sole owner of the materials are exchanged and no treatment/audit/additional validation isn't required.

Of course, the assumption is that the intermediate table has valid data for the content of the partition it will replace.

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