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[Mahara Bot <1332373@xxxxxxxxxxxxxxxxxx>]

Patch for "master" branch: https://reviews.mahara.org/6057

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https://bugs.launchpad.net/bugs/1332373

Title:
  Make it clear what the maximum length is for $cfg->dbprefix

Status in Mahara:
  Confirmed

Bug description:
  Bug 1326205, in which MySQL installs would error out if there was a
  dbprefix present, has caused me to realize that we don't really have a
  set limit on maximum dbprefix length. Obviously, setting one that's
  too long, like "thisisareallyreallyreallyreallylongdbprefix" will
  cause the code to crash no matter what.

  It would probably be a good idea to decide on a maximum dbprefix
  length, and put this into the pre-install sanity check. (It doesn't
  need to be mentioned in the config-dist.php file, because most people
  are going to be reasonable and use something short.)

  For reference, MySQL has a limit of 64 characters for names of most
  things ( http://dev.mysql.com/doc/refman/5.1/en/identifiers.html ) and
  Postgres has a limit of 63 characters (because the "name" datatype is
  limited to 64 characters, one of which is used for a terminating null:
  http://www.postgresql.org/docs/8.3/static/datatype-character.html ).

  With some quick testing, I find that in 1.10dev, the max length I can
  use in mysql is 25 characters, and in postgres it's 19 characters. I'm
  not sure why there's such a big difference... presumably this is due
  to some objects being created in Postgres but not in MySQL?

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