Recover space LOB

Hi all

I wanted to reclaim the place LOB which is currently 450 GB where I deleted database 300 GB. I ran the retractable Alter table command that lasted 1.5 days and failed with the error of MAX undo space. When running I saw that memory runtime in V$ sql like 800.

Wanted to know how to recover this 300 GB in a faster and more efficient, should I increase the size of the shared pool and size to cancel, in the grateful if so if you can suggest the real parameters and size that you would recommend, also since it is a restart of production database will be a question we will have to take an outage is there a way to do it faster without rebooting?

user674955, if you can't get the shrink command works, you could get a window and use the command alter table to move the LOB segment.

- -

move the lob ('column_name') store as lob_name

(

tablespace nom_tablespace

Activate | Disable the online storage

)

- -

If you can not get a window then you can watch the DBMS_REDEFINITION package.  Both approaches require that you have enough free space to allow you to allocate the new copy, while the existing segment still exists.

- -

If space is an issue, you can export data, truncate or drop/recreate the table and import the data.

- -

In any case make sure that you have sufficient tablespace temporary to rebuild the indexes on the table.

- -

HTH - Mark D Powell.

Tags: Database

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