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MySQL - efficiency and other topics

Following on from the last two days of MySQL training, you'll see a number of blog entries covering stored procedures, securing a mysql server, and exploring database requests in PHP.

Complex mysql join conditions effect mysql performanceFurther technical diagrams can be found here ... including how to make your select queries efficient, table locking, storing of calculated results (in summary, don't!) and why server and client are shipped together. The diagram alongside this text shows how a query that joins two tables with around 10,000 records each may produce a temporary table internally with 90 million records if you write an inefficient joing, but just 10,000 temporary records with a very slight tuning of the SQL command.

MySQL is covered on our public public MySQL course, and its installation within a LAMP environment on deploying LAMP. Calling up MySQL databases from individual languages when you're programming is covered on the appropriate language course ... typically these course give only a brief overview of MySQL and also tell you how you use Sqlite, Oracle and other databases too.

(written 2009-10-10, updated 2009-10-12)

 
Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articles
S157 - More MySQL commands
  [4481] Extracting data from backups to restore selected rows from MySQL tables - (2015-05-01)
  [3270] SQL - Data v Metadata, and the various stages of data selection - (2011-04-29)
  [3061] Databases - why data is split into separate tables, and how to join them - (2010-11-20)
  [2647] Removing duplicates from a MySQL table - (2010-02-22)
  [2645] Optimising and caching your MySQL enquiries - (2010-02-22)
  [2644] Counting rows in joined MySQL tables - (2010-02-22)
  [2643] Relating tables with joins in MySQL - (2010-02-21)
  [2259] Grouping rows for a summary report - MySQL and PHP - (2009-06-27)
  [2110] MySQL - looking for records in one table that do NOT correspond to records in another table - (2009-03-31)
  [1904] Ruby, Perl, Linux, MySQL - some training notes - (2008-11-23)
  [1735] Finding words and work boundaries (MySQL, Perl, PHP) - (2008-08-03)
  [1574] Joining MySQL tables revisited - finding nonmatching records, etc - (2008-03-15)
  [1331] MySQL joins revisited - (2007-09-03)
  [1235] Outputting numbers as words - MySQL with Perl or PHP - (2007-06-17)
  [1213] MySQL - the order of clauses and the order of actions - (2007-06-01)
  [673] Helicopter views and tartans - (2006-04-06)
  [591] Key facts - SQL and MySQL - (2006-02-04)
  [581] Saving a MySQL query results to your local disc for Excel - (2006-01-29)
  [572] Giving the researcher power over database analysis - (2006-01-22)
  [567] Combining similar rows from a MySQL database select - (2006-01-17)
  [517] An occasional chance, and reducing data to manageable levels - (2005-12-04)
  [515] MySQL - an FAQ - (2005-12-03)
  [513] MySQL - JOIN or WHERE to link tables correctly? - (2005-12-01)
  [502] SELECT in MySQL - choosing the rows you want - (2005-11-22)
  [494] MySQL - a score of things to remember - (2005-11-12)
  [449] Matching in MySQL - (2005-09-24)
  [279] Getting a list of unique values from a MySQL column - (2005-04-14)
  [159] MySQL - Optimising Selects - (2004-12-21)
  [158] MySQL - LEFT JOIN and RIGHT JOIN, INNER JOIN and OUTER JOIN - (2004-12-20)


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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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