Re: Very slow viewing of large table.

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От Andreas Pflug
Тема Re: Very slow viewing of large table.
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Msg-id 3F97B298.8040103@pse-consulting.de
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Ответ на Re: Very slow viewing of large table.  ("Dave Page" <dpage@vale-housing.co.uk>)
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Dave Page wrote:

> 
>
>  
>
>>-----Original Message-----
>>From: Constantin Stefanov [mailto:cstef@mail.ru] 
>>Sent: 23 October 2003 08:59
>>To: pgadmin-support@postgresql.org
>>Subject: Re: [pgadmin-support] Very slow viewing of large table.
>>
>>    
>>
>>>SELECT relname, reltuples FROM pg_class;
>>>      
>>>
>>For my table there is
>>------------------------------
>>accounting# SELECT relname, reltuples FROM pg_class where 
>>relname='ip_accounting';
>>     relname    |  reltuples
>>---------------+-------------
>>  ip_accounting | 7.71493e+07
>>------------------------------
>>May be there is some overflow or incorrect result parsing?
>>    
>>
>
>Hmm, shouldn't be - the code appears to use longs everywhere. I can't
>really spend time on this now though - Andreas, can you take a look
>please?
>  
>
It's not an overflow, instead the column is scanned as int, resulting in 
reltuples=7 (which isn't too precise :-)
I changed the types of rows to wxLongLong, and estimatedRows to double now.

Regards,
Andreas




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