Want to update a column with different column of same table

I have a table TEST_CDR which is having 250 millions records also having partition by hash.
there are two column in this table ID and CDR_ID want to update ID in CDR_ID but it take too much time like 24 hours or more.
please suggest me a simple way.

Hi,
You can try this. but be careful about your backups and go through CTAS,nologging and parallel concepts...
Please refer this link.
http://www.dba-oracle.com/t_fast_batch_updates_ctas.htm
http://www.dba-oracle.com/t_nologging_append.htm
http://www.dba-oracle.com/t_efficient_update_sql_dml_tips.htm
http://eriglen.blogspot.in/2011/08/ctas-create-table-as-select-with.html
1.CTAS with nologging and parallel..
SQL> create table test_cdr_1(id,cdr_id) nologging parallel as select id,id from test_cdr;
2.rebuild indexes, triggers and constraints to test_cdr_1
3.rename test_cdr to bkup_test_cdr;
4.rename test_cdr_1 to test_cdr;
Regards,
ragunath.

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