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Re: insert takes too long
Posted by: nir elbaz ()
Date: January 09, 2012 08:26AM

Hi Rick ,

First of all thanks for replaying.

About the left join without null i tryied that,but it made not diffrence

what is also wierd is when i tried to see what part of the query is problematic

i spilted it to 2:

1.create table act as
(select trim(att1),b.actor_id,trim(CONCAT(att2,att3,att4,att5,att6,att7,att8,att9,att10)) m_name
from data_stg a LEFT JOIN actors b
on trim(att1)=b.actor_name
where item_id>=240
and length(trim(att1))>0);

and it created the table in a reasnable time

but when i tried the seconde part
create table act_movie as
(selec * from act a,movies b
where a. m_name=b.imdb_title)

its takes hours and doest return

and even that the actors table is 6 time bigger than movies
and i am using left join there and here when smaller tables and
a regular joing it take longer



'act_mov', 'InnoDB', '10', 'Compact', '11045420', '89', '987758592', '0', '1261436928', '2043674624', NULL, '2012-01-08 15:06:47', NULL, NULL, 'utf8_general_ci', NULL, '', ''
'movies', 'InnoDB', '10', 'Compact', '1851033', '153', '283934720', '0', '128974848', '2043674624', '8060382', '2012-01-03 18:14:41', NULL, NULL, 'utf8_general_ci', NULL, '', ''

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Subject Views Written By Posted
insert takes too long 1637 nir elbaz 01/08/2012 03:10AM
Re: insert takes too long 683 Rick James 01/09/2012 01:25AM
Re: insert takes too long 681 nir elbaz 01/09/2012 08:26AM
Re: insert takes too long 460 Rick James 01/10/2012 11:48AM


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