Question

WHERE with IN

Asked by: jairdur

Good Afternoom

select count(*) CONTADOR
  From TICKLER_RECORDS
 where tickler_code in ('REPOSICI','TRANSFER','PROACTIV','DESACTIV','PLAN PAR')
   and tickler_status = 'OPEN'
   and customer_id = :CID

This sentence have a improvement in performance?

Thank

Jair

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Asked On
2008-08-31 at 11:38:11ID23692367
Topic

PL / SQL

Participating Experts
2
Points
125
Comments
13

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Answers

 

by: angelIIIPosted on 2008-08-31 at 11:40:31ID: 22355916

>This sentence have a improvement in performance?
improvement over what alternative? or do you want some "better" syntax?
in the second case, there is no "better".

the only way to make this efficient is having an index on customer_id + tickler_status + tickler_code


 

by: jairdurPosted on 2008-08-31 at 11:46:33ID: 22355931

Agree angelIII:

Whit COUNT(1) and into any table ('REPOSICI','TRANSFER','PROACTIV','DESACTIV','PLAN PAR')

what do you thing about?
Jair

 

by: LordOfPortsPosted on 2008-08-31 at 11:47:48ID: 22355937

Try rearranging the order of criteria, checking if tickler_code value is in the array is the most resource intensive and since you are using AND logic when the query gets parsed the code should abort as soon as a simple criteria such as tickler_status = 'OPEN' is not met. If this is truly more efficient depends on the implementation of the underlying code however it is worth a try.

select count(*) CONTADOR 
  From TICKLER_RECORDS 
 where tickler_status = 'OPEN' 
   and customer_id = :CID
   and tickler_code in ('REPOSICI','TRANSFER','PROACTIV','DESACTIV','PLAN PAR')

                                              
1:
2:
3:
4:
5:

Select allOpen in new window

 

by: angelIIIPosted on 2008-08-31 at 11:48:03ID: 22355938

sorry, but I did not follow you there? could you rephrase that?

 

by: angelIIIPosted on 2008-08-31 at 11:49:25ID: 22355941

>Try rearranging the order of criteria
in oracle, the order of the criteria for such a simple query does not matter.
only the order of the fields in the index will matter.

 

by: LordOfPortsPosted on 2008-08-31 at 12:14:15ID: 22356022

From reading few references it appears that it does matter however I was mistaken it will evaluate starting with the last one first, unless ordered_predicates are used, so the order should be as it was originally set.

http://articles.techrepublic.com.com/5100-10878_11-1049665.html
http://www.dba-oracle.com/art_builder_sql_execution.htm

select count(*) CONTADOR 
  From TICKLER_RECORDS 
 where tickler_code in ('REPOSICI','TRANSFER','PROACTIV','DESACTIV','PLAN PAR') 
   and customer_id = :CID
   and tickler_status = 'OPEN'

                                              
1:
2:
3:
4:
5:

Select allOpen in new window

 

by: angelIIIPosted on 2008-08-31 at 12:22:28ID: 22356051

that's true, BUT, it's a bit more "complex", as the meaning of "evaluating" does not mean the full processing.
it means that it will check how to run the queries, ie which indexes to use, in that order.
so, if there is an index like I suggested in the first comment, the explain plan will be the same whatever order the conditions are listed in the where clause.

 

by: jairdurPosted on 2008-08-31 at 14:45:58ID: 22356490

Once again

If used count(1)
and
if I use a table with the list ('REPOSICI','TRANSFER','PROACTIV','DESACTIV','PLAN PAR') do improve performace?

 

by: angelIIIPosted on 2008-08-31 at 14:51:38ID: 22356511

count(1) vs count(*) is marginally faster. so marginal that usually, you won't be able to notice the difference until you run the query many times.

>if I use a table with the list ('REPOSICI','TRANSFER','PROACTIV','DESACTIV','PLAN PAR') do improve performace?
I understand, you would want to store that list in a table, and use a IN ( select from that table) or JOIN to that table instead.
even without testing, I am quite sure that your original code will be fastest, compared to the table alternative.

 

by: jairdurPosted on 2008-08-31 at 14:55:34ID: 22356525

Thanks

what about COUNT(1)?

 

by: angelIIIPosted on 2008-08-31 at 15:00:04ID: 22356539

you might want to reread my above comment.

 

by: angelIIIPosted on 2008-08-31 at 15:05:35ID: 22356555

 

by: jairdurPosted on 2008-08-31 at 16:28:48ID: 31491944

Gracias

20120131-EE-VQP-002

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