How to find size of a data type in pl/sql (oracle 9i)?

I want to find the size of any data type in pl/sql,for eg DECLARE x boolean;

I want to find size of like X,is there any function like (sizeof()开发者_Python百科 in C) or any how i can find it.Please let me know!

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Look up vsize() - I believe it exists for some versions of Oracle (10g and above judging from Google search), though whether it exists for Oracle 9 I do not know.