Re: PostGreSQL and recursive queries... - Mailing list pgsql-hackers

Le mardi 27 novembre 2007 à 10:00 -0500, Andrew Dunstan a écrit : <blockquote type="CITE"><pre>

<font color="#000000">Hubert FONGARNAND wrote:</font>
<font color="#000000">>     We are using the CONNECT BY patch made by Evgen Potemkin on</font>
<font color="#000000">> PostGreSQL 8.2... It works like a charm with very high performances.</font>
<font color="#000000">></font>
<font color="#000000">> But now, we are looking for the 8.3 release... Evgen Potemkin has</font>
<font color="#000000">> stopped to answer about this patch (it's quite normal, he's working at</font>
<font color="#000000">> mysql now...). I've tried to port the patch to the 8.3 postgresql</font>
<font color="#000000">> version... It compiles but it segfault. Many data structures have</font>
<font color="#000000">> changed between 8.3 and 8.2 and i'm not aware enough of postgresql</font>
<font color="#000000">> internals...</font>
<font color="#000000">></font>
<font color="#000000">> So, now the solutions : </font>
<font color="#000000">></font>
<font color="#000000">>       *     using the connectby C function... which is min 10x slower</font>
<font color="#000000">>         than the patch (we may improve it a bit, but i doubt it'd beat</font>
<font color="#000000">>         the patch...)</font>
<font color="#000000">>       *     Waiting for the WITH RECURSIVE support for the 8.4 (but i</font>
<font color="#000000">>         don't expect anything, because this is on the todo list since</font>
<font color="#000000">>         many years, and i'ven't seen any code/patch since)</font>
<font color="#000000">>       *     Someone help me to get the patch working on the 8.3</font>
<font color="#000000">>       *     moving to oracle..... :-(((( or another hierarchical aware</font>
<font color="#000000">>         database.</font>
<font color="#000000">></font>
<font color="#000000">></font>
<font color="#000000">> It's hard to explain to our manager that if we move to the next version</font>
<font color="#000000">> of postgresql there will be a performance drop.</font>
<font color="#000000">></font>
<font color="#000000">> What is the best solution</font>
<font color="#000000">> Please help me!!!</font>
<font color="#000000">></font>
<font color="#000000">></font>
<font color="#000000">>   </font>

<font color="#000000">If you are unable to get the patch working with 8.3 yourself, you can </font>
<font color="#000000">sponsor or employ someone to do it for you,</font>
</pre></blockquote><br /> I think such people is hard to find... but if someone is interested, he can contact me!<br
/><br/><blockquote type="CITE"><pre>
 
<font color="#000000"> or to get WITH RECURSIVE </font>
<font color="#000000">done for 8.4, which would solve the problem forever, or maybe even both </font>
<font color="#000000">would be worth doing.</font>
<font color="#000000">cheers</font>

<font color="#000000">andrew</font>


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