Q

Query to find size of BLOB objects

I have a table named EMP with a BLOB data type for storing the photos of each employee. I want a query to find...

what the size is of that BLOB object.

In order to find out the size of LOBs in your database, you'll want to use the DBMS_LOB supplied PL/SQL package, specifically the GETLENGTH procedure. The Oracle docs give the following example on determine the LOB size:

 CREATE OR REPLACE PROCEDURE Example_11a IS lobd BLOB; length INTEGER; BEGIN -- get the LOB locator SELECT b_lob INTO lobd FROM lob_table WHERE key_value = 42; length := dbms_lob.getlength(lobd); IF length IS NULL THEN dbms_output.put_line('LOB is null.'); ELSE dbms_output.put_line('The length is ' || length); END IF; END;

Basically, you get the LOB locator from your table. This locator points to the LOB. Using this locator, you call the DBMS_LOB.GETLENGTH procedure to determine the LOB size.

 

For More Information


This was last published in October 2002

Dig Deeper on Using Oracle PL-SQL

PRO+

Content

Find more PRO+ content and other member only offers, here.

Have a question for an expert?

Please add a title for your question

Get answers from a TechTarget expert on whatever's puzzling you.

You will be able to add details on the next page.

Start the conversation

Send me notifications when other members comment.

By submitting you agree to receive email from TechTarget and its partners. If you reside outside of the United States, you consent to having your personal data transferred to and processed in the United States. Privacy

Please create a username to comment.

-ADS BY GOOGLE

SearchDataManagement

SearchBusinessAnalytics

SearchSAP

SearchSQLServer

TheServerSide

SearchDataCenter

SearchContentManagement

SearchFinancialApplications

Close