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For 2023 (and 2024 ...) - we are now fully retired from IT training.
We have made many, many friends over 25 years of teaching about Python, Tcl, Perl, PHP, Lua, Java, C and C++ - and MySQL, Linux and Solaris/SunOS too. Our training notes are now very much out of date, but due to upward compatability most of our examples remain operational and even relevant ad you are welcome to make us if them "as seen" and at your own risk.

Lisa and I (Graham) now live in what was our training centre in Melksham - happy to meet with former delegates here - but do check ahead before coming round. We are far from inactive - rather, enjoying the times that we are retired but still healthy enough in mind and body to be active!

I am also active in many other area and still look after a lot of web sites - you can find an index ((here))
Images in a database? How big is a database? (MySQL)

The discussion came up yesterday as to whether images should be stored in plain files or in a database, with one of my delegates saying that he had been strongly advised against a database.

That advise is typically going to be correct for a handful of images ... but when you get on to thousands in a single 'directory', the directory structure of operating systems is not best set up to serve all the individual files and a database solution is the best. The database solution also allows you to hold descriptions and other information easily with the images.

"So how big is your image database?" Well - there's just over 4000 images in it, and I guessed that the disc space occupied was about a quarter of a gigabyte on the server. As my data is stored using MyISAM tables, I was able to take a look in the evening and see that my estimate was remarkable close:

-rw-rw---- 1 mysql mysql      8674 2009-03-09 17:24 im_library.frm
-rw-rw---- 1 mysql mysql 243813840 2009-05-27 21:23 im_library.MYD
-rw-rw---- 1 mysql mysql 158720 2009-05-27 21:23 im_library.MYI


All the images from the database are 'fed' via a PHP script which initially checks for a 'real' file and if it finds it, saves it into the database keyed by the file name, and deletes the real file - so it's very easy to add images. My regular database backup backs up all my images. And mod_rewrite is used to send all requests ending in .jpg to the script.
(written 2009-05-28)

 
Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articles
S161 - Data Access and Security in MySQL
  [192] Current MySQL and PHP paths and upgrades - (2005-01-28)
  [193] The wrong MySQL - (2005-01-29)
  [401] What is an SQL injection attack? - (2005-08-02)
  [535] MySQL permissions and privileges - (2005-12-20)
  [647] Checking for MySQL errors - (2006-03-15)
  [947] What is an SQL injection attack? - (2006-11-27)
  [1131] MySQL - Password security (authentication protocol) - (2007-04-02)
  [2263] Mysqldump fails as a cron job - a work around - (2009-06-30)
  [2647] Removing duplicates from a MySQL table - (2010-02-22)
  [3270] SQL - Data v Metadata, and the various stages of data selection - (2011-04-29)
  [4390] Checking MySQL database backups have worked (not failed) - (2015-01-10)
  [4406] Fixing damaged MySQL tables - Error 1712 and Error 2013 - (2015-01-25)
  [4481] Extracting data from backups to restore selected rows from MySQL tables - (2015-05-01)
  [4491] Web Server Admin - some of those things that happen, and solutions - (2015-05-10)
  [4493] Forgotten / lost MySQL root password - (2015-05-16)

S154 - MySQL - Designing an SQL Database System
  [59] MySQL - Pivot tables - (2004-09-22)
  [361] Binary Large Objects or bars - (2005-06-27)
  [375] Oops - I got my initial database design wrong - (2005-07-12)
  [494] MySQL - a score of things to remember - (2005-11-12)
  [515] MySQL - an FAQ - (2005-12-03)
  [666] Database design - get it right from first principles - (2006-04-02)
  [918] Databases needn't be frightening, hard or expensive - (2006-11-08)
  [937] Display an image from a MySQL database in a web page via PHP - (2006-11-22)
  [945] Code quality counts - (2006-11-26)
  [1423] MySQL - table design and initial testing example - (2007-11-06)
  [1575] Database design for a shopping application (MySQL) - (2008-03-15)
  [1771] More HowTo diagrams - MySQL, Tomcat and Java - (2008-08-24)
  [2053] What a difference a MySQL Index made - (2009-02-25)
  [2085] MySQL - licensing issues, even with using the name - (2009-03-16)
  [2749] Delegate Question - defining MySQL table relationships as you create the tables - (2010-05-02)
  [3361] Blowing our own trumpet - MySQL resources - (2011-07-18)
  [3494] Databases - when to treat the rules as guidelines - (2011-10-23)
  [4426] FileMaker Day to Unix Time conversion - (2015-02-15)


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This is a page archived from The Horse's Mouth at http://www.wellho.net/horse/ - the diary and writings of Graham Ellis. Every attempt was made to provide current information at the time the page was written, but things do move forward in our business - new software releases, price changes, new techniques. Please check back via our main site for current courses, prices, versions, etc - any mention of a price in "The Horse's Mouth" cannot be taken as an offer to supply at that price.

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