Ask the Expert

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.

    Requires Free Membership to View

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 first published in October 2002

There are Comments. Add yours.

TIP: Want to include a code block in your comment? Use <pre> or <code> tags around the desired text. Ex: <code>insert code</code>

REGISTER or login:

Forgot Password?
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
Sort by: OldestNewest

Forgot Password?

No problem! Submit your e-mail address below. We'll send you an email containing your password.

Your password has been sent to: