Re: Alternative variable length structure

ITAGAKI Takahiro wrote:

># select * from pgstattuple('txttbl');
>-[ RECORD 1 ]------+------
>table_len          | 8192
>tuple_count        | 1
>tuple_len          | 57    <-- 28 + (5+3) + (5+3) + (5+3) + (5)
>...
>
># select * from pgstattuple('strtbl');
>-[ RECORD 1 ]------+------
>table_len          | 8192
>tuple_count        | 1
>tuple_len          | 36    <-- 28 + 2 + 2 + 2 + 2
>  
>
>

What's the break even point in datum length between the two styles of 
header?

And what is the processing overhead of using variable header length?

cheers

andrew