Improve SQL strategy - denormalize in object-children-images case

Posted by fesja on Stack Overflow See other posts from Stack Overflow or by fesja
Published on 2010-04-22T23:52:02Z Indexed on 2010/04/22 23:53 UTC
Read the original article Hit count: 163

Filed under:

sql

|

scalability

|

model

Hi,

I have a Tour object which has many Place objects. For the list of tours, I want to show some info of the tour, the number of places of the tour, and three Place's images. Right one my SQL queries are (i'm using Doctrine with Symfony on MySQL)

get Tour
get Tour 1 places
get Tour 2 places
get Tour 3 places
...
get Tour n places

If I have a three Tour list, it's not so bad; but I'm sure it can get bad if I do a 10-20 tour-list. So, thinking on how to improve the queries I've thought of several measures:

Having a place count cache
Storing the urls of three images on a new tour field.

The problem with 2. is that if I change the image, I have to check all the tours to update that image for another one.

What solution do you think is best to scale the system in a near future? Any other suggestion.

thanks!

© Stack Overflow or respective owner

Related posts about sql

SQL SERVER – Concat Strings in SQL Server using T-SQL – SQL in Sixty Seconds #035 – Video

as seen on SQL Authority - Search for 'SQL Authority'
Concatenating string is one of the most common tasks in SQL Server and every developer has to come across it. We have to concat the string when we have to see the display full name of the person by first name and last name. In this video we will see various methods to concatenate the strings. SQL… >>> More
SQL SERVER – Concat Function in SQL Server – SQL Concatenation

as seen on SQL Authority - Search for 'SQL Authority'
Earlier this week, I was delivering Advanced BI training on the subject of “SQL Server 2008 R2″. I had great time delivering the session. During the session, we talked about SQL Server 2010 Denali. Suddenly one of the attendees suggested his displeasure for the product. He said, even though… >>> More
Error with SQL Server Setup 2012 on Windows 2012

as seen on Server Fault - Search for 'Server Fault'
I am trying to install SQL Server on Windows 2012. I was able to finally get the wizard up and running after making some changes on the server, but now it fails no matter what I do with the following error: TITLE: SQL Server Setup failure. SQL Server Setup has encountered the following error: … >>> More
How can I detect which version of SQL (eg SQL 2008 or SQL Azure)

as seen on Stack Overflow - Search for 'Stack Overflow'
I need to detect which version of SQL I am dealing with to perorm various tasks, I need specifically detect if I am on SQL 2008 or SQL Azure. How can I do this with detection code written in SQL? >>> More
Nested SQL Select statement fails on SQL Server 2000, ok on SQL Server 2005

as seen on Stack Overflow - Search for 'Stack Overflow'
Here is the query: INSERT INTO @TempTable SELECT UserID, Name, Address1 = (SELECT TOP 1 [Address] FROM (SELECT TOP 1 [Address] FROM [UserAddress] ua INNER JOIN UserAddressOrder uo ON ua.UserID = uo.UserID WHERE ua.UserID = u.UserID ORDER BY uo.AddressOrder ASC) q ORDER BY AddressOrder… >>> More

Related posts about scalability

scalability: when to use CDN?

as seen on Server Fault - Search for 'Server Fault'
i've read about CDN but dont know exactly what it is for. lets say i've got an international social network (text and image content), and it's growing in traffic from different countries, do i have use of CDN? the picture i got from the sources i've read is that it copy your content and put it in… >>> More
php vs python. scalability

as seen on Stack Overflow - Search for 'Stack Overflow'
Why is PHP considered more scalable than python? I've heard may times that one of the reasons PHP is "better" than python is that PHP is more easily scalable, and that Yahoo proves that(assumig Yahoo still uses PHP). Whats the difference between PHP and Python when it comes to scalability? -- edit… >>> More
Elastic Caching Platforms Balance Performance, Scalability, And Fault Tolerance

as seen on Devx - Search for 'Devx'
In this blog, a Forrester expert explains the benefit of elastic caching platforms. >>> More
Elastic Caching Platforms Balance Performance, Scalability, And Fault Tolerance

as seen on Internet.com - Search for 'Internet.com'
In this blog, a Forrester expert explains the benefit of elastic caching platforms. >>> More
Mochiweb's Scalability Features

as seen on Stack Overflow - Search for 'Stack Overflow'
From all the articles I've read so far about Mochiweb, I've heard this over and over again that Mochiweb provides very good scalability. My question is, how exactly does Mochiweb get its scalability property? Is it from Erlang's inherent scalability properties or does Mochiweb have any additional… >>> More