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

What is the actual size occupied by a varray (empty) in a folder?
By example, if I create my table defined as:
create or replace type XXX as object)
...
myRefs VARRAY (10) ref (yyy)
...
)
create table xxx YYY;
What is the actual size of the type XXX record when 'myRefs' is empty? For some reason, select data_length in the all_tab_cols where table_name = YYY always seems to come back 3K the length of the column myrefs... is that correct? Otherwise, what is the correct size?

End a tad...

The sizes of storage of the REF attributes are described here:

[Design Considerations for REFs - size of storage of the 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 a primary key or generated by the system if it is extended or not, and it carries with it a hint of rowid-based. The overall size of your VARRAY attribute as it grows also will depend on whether you allow nulls to REF or not, but essentially will be the size of your time REF multiplied the number of items in your VARRAY (plus a small amount of storage for internal cleaning, both for the attribute for each constant element).

You can try the VSIZE function as an appromixation...

[Oracle® database language SQL - VSIZE reference | http://download.oracle.com/docs/cd/E11882_01/server.112/e17118/functions233.htm#SQLRF06162]

It could be that useful...

Gerard

Tags: Database

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