Not able to retrieve data from table faster

Hi All,
I have a table tab1, and I am creating one more table tab2 by selecting col1,col2 of tab1.
creation query would be like this.
create table tab2 as
select as select /*+ parallel(qla,20) */ col1,col2 from tab1;
Table tab2 is created, but the problem is when we query tab2 it is taking too long time to display the results, and the table tab2 is having arount 400 million data.
Request every one to suggest how to improve the query performance which is
select * from tab2;

See the forum FAQ
SQL and PL/SQL FAQ
*3. How to improve the performance of my query? / My query is running slow.*
SQL and PL/SQL FAQ

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