10 sql tips to speed up your database | CatsWhoCode.com                                               10 sql tips to speed...
10 sql tips to speed up your database | CatsWhoCode.com                                               below:              ...
10 sql tips to speed up your database | CatsWhoCode.com                                               Don’t select what yo...
10 sql tips to speed up your database | CatsWhoCode.com                                               is like hammering yo...
10 sql tips to speed up your database | CatsWhoCode.com                                               faster to execute.  ...
10 sql tips to speed up your database | CatsWhoCode.com                                                  SELECT * FROM a, ...
10 sql tips to speed up your database | CatsWhoCode.com                                                  Getting started w...
10 sql tips to speed up your database | CatsWhoCode.com                                                            Metric ...
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10 sql tips to speed up your database | CatsWhoCode.com                                                            wxianfe...
10 sql tips to speed up your database | CatsWhoCode.com                                                            ‘may’ w...
10 sql tips to speed up your database | CatsWhoCode.com                                                                   ...
10 sql tips to speed up your database | CatsWhoCode.com                                                            variabl...
10 sql tips to speed up your database | CatsWhoCode.com                                                                   ...
10 sql tips to speed up your database | CatsWhoCode.com                                                                   ...
10 sql tips to speed up your database | CatsWhoCode.com                                                                   ...
10 sql tips to speed up your database | CatsWhoCode.com                                                                   ...
10 sql tips to speed up your database | CatsWhoCode.com                                                            Mes fav...
10 sql tips to speed up your database | CatsWhoCode.com                                                            columns...
10 sql tips to speed up your database | CatsWhoCode.com                                                            quicoto...
10 sql tips to speed up your database | CatsWhoCode.com                                                            Jack co...
10 sql tips to speed up your database | CatsWhoCode.com                                                            Vinith ...
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10 sql tips to speed up your database | CatsWhoCode.com                                                                   ...
10 sql tips to speed up your database | CatsWhoCode.com                                                            of mySQ...
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10 sql tips to speed up your database cats whocode.com

  1. 1. 10 sql tips to speed up your database | CatsWhoCode.com 10 sql tips to speed up your database On most websites, content is stored in a database and served to visitors upon request. Databases are very fast, but there’s lots of things that you can do to enhance its speed and make sure you won’t waste any server resources. In this article, I have compiled 10 very useful tips to optimize and speed up your website database. Design your database with caution This first tip may seems obvious, but the fact is that most database problems come from badly-designed table structure. For example, I have seen people storing information such as client info and payment info in the same database column. For both the database system and developers who will have to work on it, this is not a good thing. When creating a database, always put information on various tables, use clear naming standards and make use of primary keys. Source: http://www.simple- talk.com/sql/database- administration/ten-common- database-design-mistakes/ Know what you should optimize If you want to optimize a specific query, it is extremely useful to be able to get an in- depth look at the result of a query. Using the EXPLAIN statement, you will get lots of useful info on the result produced by a specific query, as shown in the examplehttp://www.catswhocode.com/blog/10-sql-tips-to-speed-up-your-database[08/29/2012 11:38:07 AM]
  2. 2. 10 sql tips to speed up your database | CatsWhoCode.com below: EXPLAIN SELECT * FROM ref_table,other_table WHERE ref_table.key_column=other_table.co lumn; Source: http://dev.mysql.com/doc/refman/5.0/e explain.html The fastest query… Is the one you don’t send Each time you’re sending a query to the database, you’re using a bit of your server resources. This is why, on high traffic sites, the best thing you can do in order to speed up your database is to cache queries. There’s lots of solutions to implement a query cache on your server. Here are a few: AdoDB: AdoDB is a database abstraction library for PHP. It allows you to use the database system of your choice (MySQL, PostGreSQL, Interbase, and way much more) and it is designed for speed. AdoDB provides a simple, yet powerful caching system. And last but not least, AdoDB is licenced under the BSD, which means that you can use freely on your projects. A LGPL licence is also available for commercial projects. Memcached: Memcached is a distributed memory caching system which is often used to speed up dynamic database-driven websites by alleviating database load. CSQL Cache: CSQL Cache is an open-source data caching infrastructure. Never tested it personally, but it seems to be a great tool.http://www.catswhocode.com/blog/10-sql-tips-to-speed-up-your-database[08/29/2012 11:38:07 AM]
  3. 3. 10 sql tips to speed up your database | CatsWhoCode.com Don’t select what you don’t need A very common way to get the desired data is to use the * symbol, which will get all fields from the desired table: SELECT * FROM wp_posts; Instead, you should definitely select only the desired fields as shown in the example below. On a very small site with, let’s say, one visitor per minute, that wouldn’t make a difference. But on a site such as Cats Who Code, it saves a lot of work for the database. SELECT title, excerpt, author FROM wp_posts; Use LIMIT It’s very common that you need to get only a specific number of records from your database. For example, a blog which is showing ten entries per page. In that case, you should definitely use the LIMIT parameter, which only selects the desired number of records. Without LIMIT, if your table has 100,000 different records, you’ll extract them all, which is unnecessary work for your server. SELECT title, excerpt, author FROM wp_posts LIMIT 10; Avoid queries in loops When using SQL along with a programming language such as PHP, it can be tempting to use SQL queries inside a loop. But doing sohttp://www.catswhocode.com/blog/10-sql-tips-to-speed-up-your-database[08/29/2012 11:38:07 AM]
  4. 4. 10 sql tips to speed up your database | CatsWhoCode.com is like hammering your database with queries. This example illustrates the whole “queries in loops” problem: foreach ($display_order as $id => $ordinal) { $sql = "UPDATE categories SET display_order = $ordinal WHERE id = $id"; mysql_query($sql); } Here is what you should do instead: UPDATE categories SET display_order = CASE id WHEN 1 THEN 3 WHEN 2 THEN 4 WHEN 3 THEN 5 END WHERE id IN (1,2,3) Source: http://www.karlrixon.co.uk/articles/sq multiple-rows-with-different-values- and-a-single-sql-query/ Use join instead of subqueries As a programmer, subqueries are something that you can be tempted to use and abuse. Subqueries, as show below, can be very useful: SELECT a.id, (SELECT MAX(created) FROM posts WHERE author_id = a.id) AS latest_post FROM authors a Although subqueries are useful, they often can be replaced by a join, which is definitelyhttp://www.catswhocode.com/blog/10-sql-tips-to-speed-up-your-database[08/29/2012 11:38:07 AM]
  5. 5. 10 sql tips to speed up your database | CatsWhoCode.com faster to execute. SELECT a.id, MAX(p.created) AS latest_post FROM authors a INNER JOIN posts p ON (a.id = p.author_id) GROUP BY a.id Source: http://20bits.com/articles/10- tips-for-optimizing-mysql-queries- that-dont-suck/ Be careful when using wildcards Wildcards are very useful because they can substitute for one or more characters when searching for data in a database. I’m not saying that you shouldn’t use them, but instead, you should use them with caution and not use the full wildcard when the prefix or postfix wildcard can do the same job. In fact, doing a full wildcard search on a million records will certainly kill your database. #Full wildcard SELECT * FROM TABLE WHERE COLUMN LIKE %hello%; #Postfix wildcard SELECT * FROM TABLE WHERE COLUMN LIKE hello%; #Prefix wildcard SELECT * FROM TABLE WHERE COLUMN LIKE %hello; Source: http://hungred.com/useful- information/ways-optimize-sql- queries/ Use UNION instead of OR The following example use the OR statement to get the result:http://www.catswhocode.com/blog/10-sql-tips-to-speed-up-your-database[08/29/2012 11:38:07 AM]
  6. 6. 10 sql tips to speed up your database | CatsWhoCode.com SELECT * FROM a, b WHERE a.p = b.q or a.x = b.y; The UNION statement allows you to combine the result sets of 2 or more select queries. The following example will return the same result that the above query gets, but it will be faster: SELECT * FROM a, b WHERE a.p = b.q UNION SELECT * FROM a, b WHERE a.x = b.y Source: http://www.bcarter.com/optimsql.htm Use indexes Database indexes are similar to those you can find in libraries: They allow the database to find the requested information faster, just like a library index will allow a reader to find what they’re looking for without loosing time. An Index can be created on a single column or a combination of columns in a database table. A table index is a database structure that arranges the values of one or more columns in a database table in specific order. The following query will create an index on the Model column from the Product table. The index is called idxModel: CREATE INDEX idxModel ON Product (Model); Source: http://www.sql- tutorial.com/sql-indexes-sql-tutorial/ More posts about SQLhttp://www.catswhocode.com/blog/10-sql-tips-to-speed-up-your-database[08/29/2012 11:38:07 AM]
  7. 7. 10 sql tips to speed up your database | CatsWhoCode.com Getting started with CouchDB: a beginner’s gu Share this article like http://www.catswhocode.com/blog/10-sql-tips-to-speed-up-your-database AVqRj-yi 387 49 20 tweets 1 retweet Like Like Comments (54) - Leave yours Bart Jacobs said: March 8, 2010 at 11:49 am This article is very useful for anyone working with mySQL (and with databases in general). For high traffic websites especially, database queries can be the bottleneck (and often are). Thanks for this great post! Reply Can Aydoğan said: March 8, 2010 at 1:27 pm Great article. Thanks for sharing! Replyhttp://www.catswhocode.com/blog/10-sql-tips-to-speed-up-your-database[08/29/2012 11:38:07 AM]
  8. 8. 10 sql tips to speed up your database | CatsWhoCode.com Metric Stormtrooper said: March 8, 2010 at 3:27 pm your table type can also make a lot of difference. MyISAM is better if you expect a lot of reads, InnoDB if you need more writes in a table (see also http://www.softwareprojects.com mysql-storage-engines- 1470.html ). And don’t forget to enable the query cache in your my.ini Reply Kovica said: March 8, 2010 at 3:29 pm “Use Indexes” should be #1. Reply Jean- Baptiste Jung said: March 9, 2010 at 4:20 am Tips are displayed without importance order, but I agree that indexes are definitely one of the best way to optimize your DB! Replyhttp://www.catswhocode.com/blog/10-sql-tips-to-speed-up-your-database[08/29/2012 11:38:07 AM]
  9. 9. 10 sql tips to speed up your database | CatsWhoCode.comhttp://www.catswhocode.com/blog/10-sql-tips-to-speed-up-your-database[08/29/2012 11:38:07 AM]
  10. 10. 10 sql tips to speed up your database | CatsWhoCode.comhttp://www.catswhocode.com/blog/10-sql-tips-to-speed-up-your-database[08/29/2012 11:38:07 AM]
  11. 11. 10 sql tips to speed up your database | CatsWhoCode.comhttp://www.catswhocode.com/blog/10-sql-tips-to-speed-up-your-database[08/29/2012 11:38:07 AM]
  12. 12. 10 sql tips to speed up your database | CatsWhoCode.com wxianfeng said: March 8, 2010 at 8:57 pm very helpful~! Reply 10 sql tips to speed up your database | [codepotato] said: March 9, 2010 at 4:00 am [...] 10 sql tips to speed up your database Posted March 9th, 2010 in Blog by Gareth http://www.catswhocode.com/blo sql-tips-to-speed-up-your- database [...] Reply Anonymous said: March 9, 2010 at 8:13 am One thing anyone thinking about optimising their queries should bear in mind is not to do it straight away. Get your code working and then go back to it and improve if necessary. en.wikipedia.org/wiki/Program_o Also, you missed the wordhttp://www.catswhocode.com/blog/10-sql-tips-to-speed-up-your-database[08/29/2012 11:38:07 AM]
  13. 13. 10 sql tips to speed up your database | CatsWhoCode.com ‘may’ when you mentioned UNION. Your source states “may run faster than”, not “will be faster”. I’ve found that OR is faster than UNION and a quick google on the subject confirms this: mysqlperformanceblog.com/2007 vs-union-all-performance/ Your source, bcarter.com/optimsql.htm was apparently last updated in 1996 and I’d like to think MySQL had changed quite a bit since then. If anyone’s looking into speeding up their MySQL stuff then mysqlperformanceblog.com is highly recommended, the English isn’t always great though and the navigation sucks but give it a try. To expand on what Dirk so rightly said, Indexes are great for tables where there will be a lot of read (SELECT) operations. But if you’re often writing to a table then the Indexes can slow it down because of course the index must be updated. Could you please consider an update Jean, which reflects what Dirk and I have mentioned? Reply Jean- Baptiste Jung said: March 9, 2010 at 8:49 am You’re righthttp://www.catswhocode.com/blog/10-sql-tips-to-speed-up-your-database[08/29/2012 11:38:07 AM]
  14. 14. 10 sql tips to speed up your database | CatsWhoCode.com about the bcarter source: I didn’t checked the “last update” date when writing the article, sorry for this. I rarely update posts, but I’ll rewrite some parts this week, according to my busy schedule. Thanks a lot for your interest! Reply Timothy said: March 9, 2010 at 8:47 am Also, here are a few more details that could help: 1) Be wise with column types (VarChar, Blob, Clob / Long Text, etc). When using something like int, varchar, etc with a set length the SQL server will know what to expect when conducting queries. If you use something like Clob / Long Text, which does not have a set limit, then the server will not know what to expect, so the queries have to way of being optimized. Basically, it means that every query that involves a column with such a type will be slow. Only use thesehttp://www.catswhocode.com/blog/10-sql-tips-to-speed-up-your-database[08/29/2012 11:38:07 AM]
  15. 15. 10 sql tips to speed up your database | CatsWhoCode.com variable types if you need to. 2) Using trims or other string modifiers will greatly slow down your queries. The server will have to do this on each row. Pretty logical when you think about it. Any time you are modifying a string or other variable type within a query you are adding a great deal of overhead. If you can, put these kind of things on the server script side (PHP, Ruby, etc). 3) If you have two tables, with 1 to 1 for every (key word there) row, then why not use just one table? Don’t make more tables than you need. Just because you’ll have more columns doesn’t mean you will have to SELECT them all. 4) If you can, avoid putting certain things in a table. Like images. I often find out that people store certain images in a table as BLOBs and a column for the image mimetype. Then they query the image and use something like PHP to spit it out onto the page. The only time I’ve really seen this to be necessary is with CAPTCHA images. Where the image is stored as a BLOB alongside a hash representing the text in the image. Though, you could probably put the images in a folder with random filenames and have a table matching filenames to hash values. But that can open up some security risks (like black-hats creating their own look-up table so that they can produce scripts).http://www.catswhocode.com/blog/10-sql-tips-to-speed-up-your-database[08/29/2012 11:38:07 AM]
  16. 16. 10 sql tips to speed up your database | CatsWhoCode.com Reply Jean- Baptiste Jung said: March 9, 2010 at 5:29 pm Thanks for the additional tips! Reply Daniel said: March 9, 2010 at 6:25 pm in reply to your tip 3: i disagree. sometimes it can make sense to split up a table into two, because searching in very wide (lots of columns) tables also has a performance impact. splitting up tables is pretty useful if you only search on a couple of fields in this table, and the majority of the other fields is just “additional info” such as timestamps, user_ip, file locations etc. you never consider when looking up records. this also means that it is easier to keep your “index-http://www.catswhocode.com/blog/10-sql-tips-to-speed-up-your-database[08/29/2012 11:38:07 AM]
  17. 17. 10 sql tips to speed up your database | CatsWhoCode.com table” free from variable length data types as described in tip 1 Reply Tomasz Kowalczyk said: March 9, 2010 at 1:53 pm Very good list, I would also add using ORMs such as Doctrine / Propel [included in frameworks such as symfony] that are caching everything – no need to remember that things. Reply Sebastiaan Stok said: March 11, 2010 at 1:45 pm NEVER EVER USE ORM!!! That is performance killer number one. There are to many bad things about Object Relation Mapping. * You can’t, you just can’t optimize the query (no realy) * Having an oject for every row is heavy ofhttp://www.catswhocode.com/blog/10-sql-tips-to-speed-up-your-database[08/29/2012 11:38:07 AM]
  18. 18. 10 sql tips to speed up your database | CatsWhoCode.com memory usage * I even heard about an option to buffer query execution, to do it in one time. That is not only stupid. But it is also very dangerous! I use transactions allot and using an ORM system will break this. Some one I know decided on using an ORM, and is not very happy with it. But he can’t switch since that will break the coding. And something else, ORM will make you brake with almost very design principle and pattern there is. Just use plain old SQL, it is much better and flexible.http://www.catswhocode.com/blog/10-sql-tips-to-speed-up-your-database[08/29/2012 11:38:07 AM]
  19. 19. 10 sql tips to speed up your database | CatsWhoCode.com Reply mithu said: March 9, 2010 at 4:35 pm Life saving tricks. Thankx. Reply CoryMathews said: March 9, 2010 at 5:07 pm “Use join instead of sub queries” Depends on if the sub query is in the select from or where statement. So this advice while normally true for selects is not always true for the from or where statement. Thus is false. “Use UNION instead of OR” His benchmark says that but every db I have worked with says otherwise.. Reply James Edinburgh said: March 9, 2010 at 6:26 pm Thanks for this information. I’m just getting started in the world of SQL and databases and this is some solid advice. I’ve been playing around with WordPress and other PHP based CMS systems and I really really want to get started and build my own system, i’ll be sure to put these tips to work when I do. Replyhttp://www.catswhocode.com/blog/10-sql-tips-to-speed-up-your-database[08/29/2012 11:38:07 AM]
  20. 20. 10 sql tips to speed up your database | CatsWhoCode.com Mes favoris du 8-03-10 au 10-03-10 » Gilles Toubiana said: March 10, 2010 at 9:03 am [...] 10 sql tips to speed up your database [...] Reply » ce que j’ai vue depuis mon retour ! oxynel, blog communication - Agence de communication Montpellier said: March 10, 2010 at 11:03 am [...] Du SQL, du SQL ou l’art d’optimiser ses requêtes [...] Reply 10 Astuces SQL pour améliorer vos requêtes | KubX said: March 11, 2010 at 7:51 am [...] 10 sql tips to speed up your database. Tags:sql [...] Reply Harsh Athalye said: March 11, 2010 at 11:38 am Good SQL tips. Optimizing queries is such a huge topic in itself, that a book can be written around it. But basically tips mentioned here are good enough. I would add some more: 1. Choose wise columns when creating indexes. Creating indexes on data types of char, varchar or such other sizable data types can kill the performance 2. If you have indexes onhttp://www.catswhocode.com/blog/10-sql-tips-to-speed-up-your-database[08/29/2012 11:38:07 AM]
  21. 21. 10 sql tips to speed up your database | CatsWhoCode.com columns, try to avoid wrapping column inside a function 3. Convert IN clause to joins 4. Set based queries definitely beat procedural approach like cursors in terms of performance Reply Brian said: March 12, 2010 at 2:03 am Great tips there, I’m suprised you’ve not mentioned the mysql query cache, qcache. This can dramatically speed up mysql especially on high traffic sites. I must admit i’d not given much thought to design, I lumped all the fields in one table which was fine when the site had 100 entries but now it has over 3000 things are really starting to suffer and I’m having to strip out the database and organise it. It goes to show that a little bit of haste can really turn into a lot of waste later on. Reply LISA TORRES said: March 13, 2010 at 10:18 am The server will have to do this on each row. Pretty logical when you think about it. Any time you are modifying a string or other variable type within a query you are adding a great deal of overhead. Replyhttp://www.catswhocode.com/blog/10-sql-tips-to-speed-up-your-database[08/29/2012 11:38:07 AM]
  22. 22. 10 sql tips to speed up your database | CatsWhoCode.com quicoto said: March 17, 2010 at 11:03 am Nice I never though how bad can be ask for “SELECT *” without no LIMIT or without asking for certain fields. Regards Reply TDAH said: March 19, 2010 at 1:25 am Man, I just tried these on my db and they worked great, thanks Reply Christian said: March 19, 2010 at 5:02 am Wow, I did not know the update query with the nice “CASE” syntax until now. Very helpful. Thanks. Reply Jonathan Good said: March 20, 2010 at 1:50 pm Great article thanks for sharing – we can all use faster dbs! Reply Agnideb Mishra said: March 20, 2010 at 10:32 pm excellent article! The queries are particularly very helpful for a newbie like me. Thanks for the awesome information. Replyhttp://www.catswhocode.com/blog/10-sql-tips-to-speed-up-your-database[08/29/2012 11:38:07 AM]
  23. 23. 10 sql tips to speed up your database | CatsWhoCode.com Jack colt said: March 22, 2010 at 11:56 pm Thanks for the tips. Most of my websites are really slow in loading. I tried using WP super chache without much success. It appears now that the culprit lies in my design and database. Reply Shukrit Verman said: March 27, 2010 at 11:15 pm Thanks a bunch for this article. I will try to fix my slow blog using these tips Reply Chimpu Sharma said: March 27, 2010 at 11:22 pm I have always had to take my web host’s help for running sql queries. Thanks to this article, I guess I would no longer have to! Thanks again Reply Bob said: March 27, 2010 at 11:36 pm “I tried using WP super cache without much success.” It is not working for me either. Actually, while it is supposed to speed up my blog, it is actually slowing the blog down I would try using the database optimization tips laid out in this article. Replyhttp://www.catswhocode.com/blog/10-sql-tips-to-speed-up-your-database[08/29/2012 11:38:07 AM]
  24. 24. 10 sql tips to speed up your database | CatsWhoCode.com Vinith Shukla said: March 27, 2010 at 11:39 pm Thank you very much for these details; but for them, I would not have known how to optimize my SQL database! Reply Dan - LogoFoo.com said: March 31, 2010 at 8:41 pm Very helpful. By the way, I think using SELECT * is not really that harmful if you combine it with the LIMIT operator. Reply Blogger said: April 1, 2010 at 9:10 am Hu, i had never thought that those changes could speed up my DB. Thanks for collecting these informations! Reply SQLを早くする10個の項目 | アイビースター said: April 7, 2010 at 2:02 am [...] 10 sql tips to speed up your database [...] Reply fireRoxy said: April 13, 2010 at 4:45 am very useful tips. thank you very much. Replyhttp://www.catswhocode.com/blog/10-sql-tips-to-speed-up-your-database[08/29/2012 11:38:07 AM]
  25. 25. 10 sql tips to speed up your database | CatsWhoCode.com Savita Bisht said: April 22, 2010 at 11:20 pm yeah, it is a nice article, worked great for me. Reply Mundu said: April 29, 2010 at 11:06 am Thanks so much for this informative article. I now know how to fix my extremely slow blog Reply 8 consigli e trucchi sql per ottimizzare e rendere performante un Database | Pecciola said: April 30, 2010 at 12:33 am [...] Fonte : Catswhocode [...] Reply Edward said: May 13, 2010 at 10:59 am This post is very usefull, thank you I also heard about something called stored queries so you just call it by its name when you do the query for example “getnews()” but I’m a complete newbie ! Reply Michael said: May 13, 2010 at 11:37 am Thanks for sharing this information, it is very useful to my visual basic programming. Michaelhttp://www.catswhocode.com/blog/10-sql-tips-to-speed-up-your-database[08/29/2012 11:38:07 AM]
  26. 26. 10 sql tips to speed up your database | CatsWhoCode.com Reply Jamie said: May 25, 2010 at 10:51 am This is indeed very helpful. I appreciate the fact that you are providing screenshots so we would know we are on the same track while following your tutorial. Thanks so much for sharing. Reply Johnson said: May 31, 2010 at 7:04 pm Great tips, i’ve been wondering if i could customise my wordpress database, this is too slow as posts accurelates, anyone have interests ? Reply Jon said: June 11, 2010 at 1:05 pm I may have to come back to this page very shortly…a lot of good info here. Reply Jennifer R said: June 12, 2010 at 10:34 am Could use DB cache reload can increase the performance of mySQL database? Reply Büyü said: June 18, 2010 at 10:12 am Could use DB cache reload can increase the performancehttp://www.catswhocode.com/blog/10-sql-tips-to-speed-up-your-database[08/29/2012 11:38:07 AM]
  27. 27. 10 sql tips to speed up your database | CatsWhoCode.com of mySQL database? Reply Alex Wolf said: June 20, 2010 at 11:16 am Thanks for the limit tip, I didn’t know about it. Reply Charlie said: August 3, 2010 at 1:52 pm All good tips, particularly on the use of UNION over OR. As far as I know, in most SQL databases, some uses of OR prevent the use of an index. So for large tables, it is faster to scan the indices multiple times rather than searching the entire table once. Reply Sumanta Sinha said: August 20, 2010 at 5:09 am Lately one of my PHP scripts is making way too many sql queries while it could easily do the job by making fewer queries. The reason: the script developer did not bother to optimize the scripts so it could use the least possible resource. He has also stopped supporting the project a year ago. Thanks to my web host, I would have never had known about this. I would try your tips and see if it helps at all. thanks Replyhttp://www.catswhocode.com/blog/10-sql-tips-to-speed-up-your-database[08/29/2012 11:38:07 AM]
  28. 28. 10 sql tips to speed up your database | CatsWhoCode.com Felipe said: November 4, 2010 at 6:47 pm Always refreshing to see someone pop open the hood and show how it is done in the age of “just-use-my- cuttie-pretty-web-2.0- framework-and-it-will-take- care-of-everything-for-you-in- a-pinch”. Congrats. Reply Shawn said: June 21, 2012 at 11:49 am I know it’s a bit of a late post but…..”Avoid queries in loops,” while i agree with you that you shouldn’t keep sending SQL to a database while looping, i think your example is *way* to simple to be of use. You are essentially hard coding the case values which 1. Shouldn’t be hard coded and 2. only manageable for a very small set. I believe a better alternative is to go ahead and use the looping statement and GENERATE the SQL needed. Ex. Update value 1; Update value 2; update value 3, update value N. That is, to aggregate the SQL into a string variable, AND THEN send it to the database only once and after it is generated. Reply Leave a Reply Your email address will not be published. Required fields are marked * Name *http://www.catswhocode.com/blog/10-sql-tips-to-speed-up-your-database[08/29/2012 11:38:07 AM]
  29. 29. 10 sql tips to speed up your database | CatsWhoCode.com Email * Website Comment Please respect the following rules: No advertising, no spam, no keyword in name field. Thank you! 18600+ 14800 RSS READERS FOLLOWERShttp://www.catswhocode.com/blog/10-sql-tips-to-speed-up-your-database[08/29/2012 11:38:07 AM]
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  31. 31. 10 sql tips to speed up your database | CatsWhoCode.com Like CWC on Facebook! Login Cats Who Code on Facebook Like You lik Page Confirm You lik Page 1,075 people like Cats Who Code.1, people like Cats Who Code. Phil Ahmed Facebook social plugin Latest posts jQuery plugins for awesome web typography Awesome CSS3 generators to simplify front end development Practical tips to save bandwidth and reduce server load 10 useful typography tips to improve your website readability WordPress dashboard hacks for developers and freelancershttp://www.catswhocode.com/blog/10-sql-tips-to-speed-up-your-database[08/29/2012 11:38:07 AM]
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