| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Matt Mello <alien(at)spaceship(dot)com> |
| Cc: | pgsql-performance <pgsql-performance(at)postgresql(dot)org> |
| Subject: | Re: 1 char in the world |
| Date: | 2003-01-29 23:59:26 |
| Message-ID: | 5513.1043884766@sss.pgh.pa.us |
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| Lists: | pgsql-performance |
Matt Mello <alien(at)spaceship(dot)com> writes:
> Is that true if I have a table that consists of lots of 1-char fields?
> For example, if I have a table with 4 billion records, which consist of
> (20) 1-char fields each, then the storage for the data will be something
> like 5 times as large if I use TEXT than if I use "char".
Probably more like 8 times as large, when you allow for alignment
padding --- on most machines, TEXT fields will be aligned on 4-byte
boundaries, so several TEXT fields in a row will take up 8 bytes apiece,
vs one byte apiece for consecutive "char" or bool fields.
regards, tom lane
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