Delete millions of rows and fragmentation

Question

Hi Gurus,
i have deleted 20 lak rows from a table which has 30 lak rows,
and i wanted to release the fragmented space , please tell me the procedure other than exp/imp or alter table move
and also the recommended way to do this prod env... (coalesce /alter move etc.. )
db version is 11.2
Thanks for great help
Raj

Answer 1

870233 wrote:
Hi Gurus,
i have deleted 20 lak rows from a table which has 30 lak rows,
and i wanted to release the fragmented space , please tell me the procedure other than exp/imp or alter table move
and also the recommended way to do this prod env... (coalesce /alter move etc.. )
db version is 11.2
Thanks for great help
RajInstead of Deleting 2 Million rows out of 3 Million, I would suggest Creating a Temporary table with data that should be retained and Dropping the original table.
I believe, this will amount to lesser work.
Steps would be like below:
1. Create table your_table_temp as select * from your_table where condition to retain records;
2. Drop table your_table;
3. Alter table your_table_temp rename to your_table;
You might as well want to exploit the advantage provided by the NOLOGGING while loading your temp table.