bytea ,etc.

Hi , All!

 

Could someone clarify me  :

 

When I want to store BLOB's internally in database (for example jpeg )

should I use bytea or OID? Is OID something like BFILE in Oracle 8i?

If both are appropriate why I can't use

update image set picture=lo_import('Myfile') where image_code='blablabla'

with bytea column type but only with OID column type?

 

And one more thing:

Where is function byteain documented?

 

TIA,

Andrew.