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Welcome to my blog, which was once a mailing list of the same name and is still generated by mail. Please reply via the "comment" links.

Always interested in offers/projects/new ideas. Eclectic experience in fields like: numerical computing; Python web; Java enterprise; functional languages; GPGPU; SQL databases; etc. Based in Santiago, Chile; telecommute worldwide. CV; email.

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Colorless Green.

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Cache rewrite.

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Updating Wikipedia (Mediawiki) to use Postgres 8.3

From: "andrew cooke" <andrew@...>

Date: Sun, 13 Jul 2008 17:39:18 -0400 (CLT)

This was rather painful.  I can't given an exact walkthrough because it
was one of the messy iterative "push this on the stack of alternatives"
problems, but the basic idea is:

- Copy your 8.2 data directory somewhere else
- Install 8.3
- Point 8.3 at you old data and do a dump of the Wiki database
- Install Mediawiki 1.12 (this has fixes for Postgres 8.3)
- Create a new database using Mediawiki 1.12 and Postgres 8.3
- Dump the (new, empty) 8.3 database
- By hand, edit the 8.3 database dump so that it includes the data
  from the 8.2 database dump (except for the revision table and the
  the tables related to the old text search stuff)
- Delete the 8.3 database and import from the (hand-merged) dump

In other words, for the tables that are in the 8.3 database, use the data
from the 8.2 database.

I did try the various methods described on blogs, and using various
scripts in the maintenance directory.  But only the above worked.  Given
the poos support for Postgres with Mediawiki it's probably worth moving to
MySQL (although last time I tried the XML dump didn't work with Postgres,
so I'm not sure how)

Andrew

Maybe too Negative?

From: "andrew cooke" <andrew@...>

Date: Tue, 15 Jul 2008 07:22:03 -0400 (CLT)

Perhaps I was too negative above.  In general Mediawiki works perfectly
(absolutely no previous problems) with Postgres.  However, in changing
from 8.2 to 8.3 Postgres changed how they handle text searches, which are
critical for Mediaiwik and so meant "significant" changes to the database.

So hopefully this was an exception.

Andrew

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