vb.org Archive - Optimizing a Query to Blog

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- - Optimizing a Query to Blog (https://vborg.vbsupport.ru/showthread.php?t=242505)

tsptom

05-14-2010 04:29 PM

Optimizing a Query to Blog

Hi all -

On the homepage of my website (non-VB) I created links to the latest 2 blog entries. The query which finds the latest post does not seem to have a problem, but the query that grabs the second to last post seems to be sluggish.

This one seems OK...

Code:

SELECT *

FROM vb_blog

where state = 'visible' and

           blogid in (select max(blogid) from vb_blog

                          where state = 'visible');

This one seems to slow things down...

Code:

SELECT *

FROM vb_blog

where state = 'visible' and

           blogid in (select max(blogid) -1 from vb_blog

                          where state = 'visible');

# Query_time: 4 Lock_time: 0 Rows_sent: 1 Rows_examined: 254528

Any suggestions to speed this up?

Thanks!

Deceptor

05-15-2010 04:50 PM

Why not a query to select both?
[sql]select * from vb_blog where state = 'visible' order by blogid desc limit 2;[/sql]

tsptom

05-15-2010 06:34 PM

Thanks! Let me give that a shot.

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