What is the actual size of an (empty) varray in a record?

what is the actual size occupied by an (empty) varray in a record?
For example, if I create my table defined as:
create or replace type XXX as object (
myRefs VARRAY(10) of REF(yyy)
create table YYY as XXX;
what is the actual size of the record of type XXX when 'myRefs' is empty? For some reason, select data_length from all_tab_cols where table_name = YYY seems always to return 3K as the length of column myrefs.... is that correct? If not, what is the correct size?

A tad late here...
Storage sizes of REF attributes are described here:
[Design Considerations for REFs - Storage Size of REFs|http://download.oracle.com/docs/cd/E11882_01/appdev.112/e11822/adobjdes.htm#i452226]
The size of your REF attribute (or element, in your case) will depend on whether it is primary key-based or system-generated, whether it is scoped or not, and whether it carries with it a rowid hint. The overall size of your VARRAY attribute as it grows will also depend on whether you allow null REF values or not, but essentially will be the size of your REF multiplied times the number of elements in your VARRAY (plus a small, constant amount of storage for internal housekeeping, both for the attribute and for each element).
You could try the VSIZE function as an appromixation...
[Oracle® Database SQL Language Reference - VSIZE|http://download.oracle.com/docs/cd/E11882_01/server.112/e17118/functions233.htm#SQLRF06162]
Hope it helps...
Gerard

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A tad late here...
Storage sizes of REF attributes are described here:
[Design Considerations for REFs - Storage Size of REFs|http://download.oracle.com/docs/cd/E11882_01/appdev.112/e11822/adobjdes.htm#i452226]
The size of your REF attribute (or element, in your case) will depend on whether it is primary key-based or system-generated, whether it is scoped or not, and whether it carries with it a rowid hint. The overall size of your VARRAY attribute as it grows will also depend on whether you allow null REF values or not, but essentially will be the size of your REF multiplied times the number of elements in your VARRAY (plus a small, constant amount of storage for internal housekeeping, both for the attribute and for each element).
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[Oracle® Database SQL Language Reference - VSIZE|http://download.oracle.com/docs/cd/E11882_01/server.112/e17118/functions233.htm#SQLRF06162]
Hope it helps...
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What is the actual size of an (empty) varray in a record?

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