| From: | Andrew Dunstan <andrew(at)dunslane(dot)net> |
|---|---|
| To: | ITAGAKI Takahiro <itagaki(dot)takahiro(at)lab(dot)ntt(dot)co(dot)jp> |
| Cc: | pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: Alternative variable length structure |
| Date: | 2005-09-08 18:22:28 |
| Message-ID: | 43208164.5090303@dunslane.net |
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| Thread: | |
| Lists: | pgsql-hackers |
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
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