estimate Index size

Hi All,
I want to calculate bytes taken for a record before inserting it into table.
Now I am doing bulk inserts into table with 200 records using PQputCopyData.
Before inserting 200 records, I want to verify if the size of DB is
sufficient for that insertion. I think for that I have to calculate record
size + index size for each record *before insertion*.

Please guide on this.

Thanks and Regards,
S.Sangeetha

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