Ühel kenal päeval (neljapäev, 10. märts 2005, 20:07+0200), kirjutas
Ioannis Theoharis:
>
> Hi,
>
> i have a table:
>
> create table triples(
> att0 varchar(1000),
> att1 int4,
> att2 varchar(20),
> att3 varchar(1000)
> )
>
> My table has 990 raws.
>
> The (possibly wrong) way, with wich i compute the size of the table is:
Varchar fields (actually most *char and text fields) use only actual
length bytes + some overhead for tuple header + page header, so unless
you fill all varchar(1000) fields with exactly 1000-byte strings, you
should use less than that.
> Is there any compression or what?
Compression is not used for tuples under 2k, so there _may_ be
coimpression depending on your exact data and TOAST settings.
>
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> TIP 9: the planner will ignore your desire to choose an index scan if your
> joining column's datatypes do not match
--
Hannu Krosing <[EMAIL PROTECTED]>
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