Question

temp table vs added and deleting rows

Asked by: paries

Hello,
I am looking for some insigt.
I have a web application that via a query is going to populate a table.
when finished the data will be thrown away.

first i was thinking of temp tables, but from what i can tell the table will be dropped as soon as the dbsession is dropped which will not for for me since i am using database pooling so the sessions really never drop and each time the user goes to a new page thier session is the same but they will get a different DB session.

So what i am wondering is it better to create a table and when the users session dies , the appication deletes the table, or is it better to have a table where i just insert and delete rows

thanks for any insight

Randy

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Asked On
2009-10-08 at 15:12:11ID24797784
Topic

MySQL Server

Participating Experts
2
Points
500
Comments
6

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Answers

 

by: virmaiorPosted on 2009-10-09 at 07:24:43ID: 25535277

for what you describe, it seems it would be better to use a rows within a table solution

the overhead of adding a table and dropping it is more than adding a single row and dropping it or updating at at time.

another variable here is how much data is going to be in each row and whether it is properly normalized.

 

by: pariesPosted on 2009-10-09 at 10:52:11ID: 25537212

the data will be normallized but for each session it could be 1000 rows

thanks

 

by: virmaiorPosted on 2009-10-09 at 11:00:58ID: 25537281

oh, well that does change things a bit.

it might be better to use "temp" tables in that case and just keep track of what table is assigned to each user.

 

by: routinetPosted on 2009-10-09 at 17:55:11ID: 25540098

Taking the database's session management into the application is bound to cause you headaches.  Instead, use the idea you stated in your question:

>>> or is it better to have a table where i just insert and delete rows

One part of each row should be the user it belongs to.  That means one big 'temp' table that all users have access to through a view which limits them to only their records.

 

by: virmaiorPosted on 2009-10-09 at 19:35:28ID: 25540491

regarding routinet's suggestion, i don't think that's the best idea because of the frequency of insert/deletes.  the index regeneration will be slower than managing each user as a table separately if there are 1000 rows/user.

the point about not bringing session management into the app is definitely valid and should be taken into account as a liability of the method i recommend.

 

by: pariesPosted on 2009-10-10 at 15:37:51ID: 25544150

one more thing to mention.
once this data is compiled for this users session , i will be doing various filters on this dataset
so the user will build this initial dataset
the hopefully play with it a little (during their session) but multiple webpage pages which would mean different mysql session.

I guess what may be the best is to do some timing tests

i appreciate your comments
 

20120131-EE-VQP-002

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