How the space is reused after update?

General question Oracle if not sure db version is necessary to answer question but version 11.1.0.7

I have an Oracle about 1 million lines table that contains 5 small varchar columns and a blob, blob images average size is 50 k. I am currently archiving of old images of blob on a local disk and affecting the image of the null BLOB.

How Oracle reuses the space between blobs which I put to null? I really don't want the tablespace data files extend more and hope that before expanding, it will reuse the space between the blobs that are set to null.

Thank you

Hello

A little test just to be sure:

Creates a table lob_test (id number, blob of data);

Filled the table with data and performing a data update lob_test = null;

=================================================
See below:

SQL > select object_name, object_type from user_objects where
object_type = 2 "LOB";

OBJECT_NAME
-------------------------------------------------------------------

OBJECT_TYPE
-------------------
SYS_LOB0000059918C00002$ $
LOB

SQL >

SQL > select round (sum (bytes) / 1024/1024) mb from WHERE user_segments where nom_segment
= ' SYS_LOB0000059918C00002$ $";

MB
----------
13

SQL > alter table lob_test modify lob (data) (shrink space);

Modified table.

SQL > select round (sum (bytes) / 1024/1024) mb from WHERE user_segments where nom_segment
= ' SYS_LOB0000059918C00002$ $";

MB
----------
0

SQL >

=====================================================
Conclusion: nulled blobs are actually picked up by a shrink operation!

PS: the segment Advisor did not return all the advice to all the...

Tags: Database

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