Insert/append taking way too long

Hello,
I am trying to load the data from DB1 to DB2 via db-link, structure is as
DB#1
My_table
col1
c0l2
c0l3
col4
col15
DB#2
DB2_My_table
col1
c0l2
c0l3
col4
col15
Index on col1 ,col3,col5Structure is same
I have created a synonym MY_TABLE on DB#2 for my_table@DB1.
CREATE OR REPLACE SYNONYM MY_TABLE
FOR MY_TABLE@DB1Now for loading i am doing something like this on DB#2
Insert /*+ append*/ INTO DB2_MY_TABLE
(col1
col2
col3
col15
SELECT
col1
col2
col3
col15
from MY_DB
where col15 is nullTotal rows count in MY_TABLE@DB1 is 711,997,846
Currently this process takes nearly 3 hr , i am looking to optimize this in any way if i can.
Any reply/hint/idea will be much appreciated.
Oracle version on DB1
Oracle Database 11g Enterprise Edition Release 11.1.0.7.0 - 64bit Productionon DB2
Oracle Database 11g Enterprise Edition Release 11.1.0.7.0 - 64bit ProductionThanks!

user10647455 wrote:
Currently this process takes nearly 3 hr , i am looking to optimize this in any way if i can.
Any reply/hint/idea will be much appreciated.It appears optimized to me.
HOW To Make TUNING request
SQL and PL/SQL FAQ
Handle:     user10647455
Status Level:     Newbie (15)
Registered:     Nov 24, 2008
Total Posts:     298
Total Questions:     79 (52 unresolved)

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Insert/append taking way too long

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