mahara-contributors team mailing list archive

[Aaron Wells <1081947@xxxxxxxxxxxxxxxxxx>]

Sorry about the frustration. We try to fix issues as soon as we can, but
we've got limited resources. :(

Really the main limitation on MySQL support is that the Mahara lead
developers, my employer Catalyst IT (http://www.catalyst.net.nz), is an
organization that primarily uses Postgres. So, pretty much the entirety
of our paid Mahara development work is done on Postgres, because that's
what all our clients are using, and consequently MySQL-specific work has
to come out of our non-funded general bug fixing time, or from community
code contributions. We do have one Mahara client running MySQL now,
though, so you may see more active MySQL bug fixing in the future.

We would welcome a patch for this issue. On a quick search through the
code base I see only about 12 instances of CAST() still present, so in
theory it shouldn't be too much work to solve.

I haven't migrated a large site from MySQL to Postgres before, so I
can't offer any specific insights into the process. There is a page
about it on the Postgres site:
http://wiki.postgresql.org/wiki/Converting_from_other_Databases_to_PostgreSQL
. There was also a comment thread about it on mahara.org recently, in
which Dajan suggested checking the Moodle forums for advice, since it
does come up there occasionally.
https://mahara.org/interaction/forum/topic.php?id=5573

Sorry I can't be of more help!

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https://bugs.launchpad.net/bugs/1081947

Title:
  Adding Journal or Text box to a page takes approx 2 minutes to load

Status in Mahara ePortfolio:
  Confirmed

Bug description:
  Mahara version  1.5.2
  Linux CentOS release 5.8
  PHP Version 5.3.15
  MySQL 5.0.77 

  When editing a page and trying to add a normal text box by dragging it
  into the page, this loads for approx 2 minutes or more and then
  eventually appears.

  It happens with a journal too but all others are fine and are instant
  as they should be.

  I'm not getting any apache log errors for this nor general server
  errors. The only thing I am able to see is the query that it hangs on
  for this length of time.... it is the below...

  I hope someone can help as obviously this is causing quite a lot of
  issues for the users!! Anyone able to diagnose what is the issue here?

  The thing is, there is another exact version of the Mahara site
  alongside this one but just a blank version which runs perfectly fine
  so this must be an issue within the database somewhere or the
  maharadata.

  Query below: this hangs for about 1 minute 45..

  SELECT a.*, CAST(a.owner IS NOT NULL AND a.owner = '1739' AS UNSIGNED) AS editable FROM "artefact" a
              LEFT OUTER JOIN "artefact_parent_cache" apc ON (a.id = apc.artefact AND a.institution = 'mahara' AND apc.parent = 371) WHERE (
                  a.owner = '1739'
                  OR a.id IN (
                      SELECT aar.artefact
                      FROM "group_member" m
                          JOIN "artefact" aa ON m.group = aa.group
                          JOIN "artefact_access_role" aar ON aar.role = m.role AND aar.artefact = aa.id
                      WHERE m.member = '1739' AND aar.can_republish = 1
                  )
                  OR a.id IN (SELECT artefact FROM "artefact_access_usr" WHERE usr = '1739' AND can_republish = 1)
                  OR a.institution IN ('test','mahara')
              ) AND artefacttype IN('blog')ORDER BY title ASC LIMIT 10 |

  Then this one for the rest of the time until eventually the text box
  or journal appears on the page:

  SELECT COUNT(*)  FROM "artefact" a
              LEFT OUTER JOIN "artefact_parent_cache" apc ON (a.id = apc.artefact AND a.institution = 'mahara' AND apc.parent = 371) WHERE (
                  a.owner = '1739'
                  OR a.id IN (
                      SELECT aar.artefact
                      FROM "group_member" m
                          JOIN "artefact" aa ON m.group = aa.group
                          JOIN "artefact_access_role" aar ON aar.role = m.role AND aar.artefact = aa.id
                      WHERE m.member = '1739' AND aar.can_republish = 1
                  )
                  OR a.id IN (SELECT artefact FROM "artefact_access_usr" WHERE usr = '1739' AND can_republish = 1)
                  OR a.institution IN ('test','mahara')
              ) AND artefacttype IN('blogpost') |

  Thank you for your help

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