Topic: SQL*Plus and PL/SQL >> Join update in Oracle
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| Title: Join update in Oracle |
| snehotosh |
Posted: Dec 16, 2007 01:58:31 AM |
Total Post: 2
Joined: Dec, 2007
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Hi,
I am using join updation in oracle using two tables containing nearly 3 millions records.The updation is taking long hours.
Can anybody suggest a best method in oracle to do such updation with huge data?
Thanks. |
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 Mohammed Taj |
| Posted: Dec 16, 2007 09:37:20 AM |  |
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Total Post: 746
Joined: Jul, 2007
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Index is there on update tables if yes then disable index , update your database and rebuild indexes.
hope this help
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| Murtuja |
| Posted: Dec 17, 2007 05:14:21 AM | |
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Total Post: 856
Joined: Jan, 2006
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If you need update millions of rows then you need to consider CTAS (create table as select ) method
create table newtable
as select old/updated columns
from oldtable nologging
/
drop table oldtable
/
rename newtable to oldtable
and then create all required indexes , constraints etc.
this should be quite fast , try this out.
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