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For 2021 - online Python 3 training - see ((here)).

Our plans were to retire in summer 2020 and see the world, but Coronavirus has lead us into a lot of lockdown programming in Python 3 and PHP 7.
We can now offer tailored online training - small groups, real tutors - works really well for groups of 4 to 14 delegates. Anywhere in the world; course language English.

Please ask about private 'maintenance' training for Python 2, Tcl, Perl, PHP, Lua, etc.
The wrong MySQL

"MySQL won't let me log in and I'm sure I have my password right"

"I've just installed MySQL and I'm using it the first time - but it seems to have a lot of data about your books already loaded"

"I'm running MySQL version x, but it claims to be version y"

Occasional incidents of MySQL courses. A possible cause? With every trainee running a MySQL daemon on their computer so that they can practise administration tasks, someone may be connecting to the wrong server. Remember that MySQL provides its service through TCP/IP port 3306 (default) and so it can be just as easy to talk to a server on another machine as the server on yours. How is the decision made?

1. Within the code of MySQL clients, defaults are defined which are used if there's no other indication given
2. A file called /etc/my.cnf is checked for any changes from the default
(On Windows systems - my.ini in the Windows system directory)
3. A file called .my.cnf in the user's home directory is checked for any changes from default
(On Windows systems - my.cnf in the root directory)
4. Command line options can override settings

In the sourcing and Installing MySQL module of our notes, we say:
If Mysql has been pointed to elsewhere you may need to
mv /etc/my.cnf /etc/mycnf.old
mv ~/.my.cnf ~/mycnf.old

and on a new installation this will revert your MySQL clients back to defaults unless you use command line overrides.

(written 2005-01-29, updated 2006-06-05)

 
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)
  [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)
  [2204] Images in a database? How big is a database? (MySQL) - (2009-05-28)
  [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)


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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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