Dear Michail and Sergey,
Thank you very much for your responses and kind suggestions!
On 29.10.2009, at 16:53, Sergey Petrunya wrote:
this makes it clear that index on O1.tsn will not be useful. You
need indexes
on parent_tsn column.
mysql> alter table taxonomic_units1 add index (parent_t
Olga,
Would you post "SHOW CREATE TABLE taxonomic_units1\G;"?
It should give us more info on the table you are dealing with
Regards,
Mikhail Berman
Olga Lyashevska wrote:
Dear all,
I have a table which contains taxonomic data (species, genera, family,
order, class) and it is organized as a
On Thu, Oct 29, 2009 at 07:53:25PM +0300, Sergey Petrunya wrote:
> ... taxonomic_units1 AS O1
> LEFT OUTER JOIN taxonomic_units1 AS O2
> ON O1.tsn = O2.parent_tsn
>
> current optimizer has only one option(*): use Nested-Loops Join algorthm, with
> the outer table being the first one. That is,
Hi Olga,
On Thu, Oct 29, 2009 at 03:29:58PM +, Olga Lyashevska wrote:
> I have a table which contains taxonomic data (species, genera, family,
> order, class) and it is organized as adjacency list model.
>
> mysql> select* from taxonomic_units1 limit 5;
> +-+-
Thanks Kabel,
Not sure if this is the exact problem you're trying to solve, but
this helped
me in a similar situation.
http://dev.mysql.com/tech-resources/articles/hierarchical-data.html
Yes, I have seen this article before, and it is really nice. However
they do not discuss any optimizat
Not sure if this is the exact problem you're trying to solve, but this helped
me in a similar situation.
http://dev.mysql.com/tech-resources/articles/hierarchical-data.html
kabel
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Dear all,
I have a table which contains taxonomic data (species, genera, family,
order, class) and it is organized as adjacency list model.
mysql> select* from taxonomic_units1 limit 5;
+-+---+-+
| tsn | name | paren
