Postgres

If you are using Postgres, you will need to either have a database and user created for you, or simply supply the name of a Postgres user with "superuser" privileges to the configuration form. Often, this is the database user named postgres.

The database that MediaWiki will use needs to have both plpgsql and tsearch2 installed. The installer script will try to install plpgsql, but you may need to install tsearch2 yourself. (tsearch2 is used for searching the text of your wiki). Here's one way to do most of the setup. This is for a Unix-like system, and assumes that you have already installed the plpgsql and tsearch2 modules. In this example, we'll create a database named wikidb, owned by a user named wikiuser. From the command-line, as the postgres user, perform the following steps.

 createuser -S -D -R -P -E wikiuser (then enter the password)
 createdb -O wikiuser wikidb
 createlang plpgsql wikidb

[edit]Adding tsearch2

NOTE If you're using PostgreSQL 8.3.x, you don't need to perform the following steps to install tsearch2 since it has been integrated into the core.

Adding tsearch2 to the database is not a simple step, but hopefully it will already be done for you by whatever packaging process installed the tsearch2 module. In any case, the installer will let you know right away if it cannot find tsearch2.

The above steps are not all necessary, as the installer will try and do some of them for you if supplied with a superuser name and password.

For installing tsearch2 to the wikidb database under Windows, do the following steps:

1. find tsearch2.sql (probably under .\PostgreSQL\8.x\share\contrib) and copy it to the postgresql\8.x\bin directory;
2. from a command prompt at the postgresql\8.x\bin directory, type "psql wikidb < tsearch2.sql -U wikiuser";
3. it will prompt you for the password for wikiuser;

That's it!

Point (2) seems only to work on windows, cause on debian linux 4.0 (etch) only user postgres is allowed to use language c. so there it must be called by:

su - postgres -c psql wikidb < tsearch2.sql

[edit]Granting select rights

Afterwards you must grant select rights to wikiuser to the tsearch tables and insert the correct locale.

[edit]PostgreSQL 8.2 or earlier

su - postgres
psql -d wikidb -c "grant select on pg_ts_cfg to wikiuser;"
psql -d wikidb -c "grant select on pg_ts_cfgmap to wikiuser;"
psql -d wikidb -c "grant select on pg_ts_dict to wikiuser;"
psql -d wikidb -c "grant select on pg_ts_parser to wikiuser;"
psql -d wikidb -c "update pg_ts_cfg set locale = current_setting('lc_collate') where ts_name = 'default' and prs_name='default';"

If you receive an error similar to "ERROR: relation "pg_ts_cfg" does not exist" when executing the above statements, try installing tsearch2 to the wikidb database again, but instead use these two separate steps (and then try the grant statements again):

1) su - postgres
2) psql wikidb -f tsearch2.sql

[edit]PostgreSQL 8.3 or later

su - postgres
psql -d wikidb -c "grant select on pg_ts_config to wikiuser;"
psql -d wikidb -c "grant select on pg_ts_config_map to wikiuser;"
psql -d wikidb -c "grant select on pg_ts_dict to wikiuser;"
psql -d wikidb -c "grant select on pg_ts_parser to wikiuser;"

[edit]Run the installation script

Once all of the above steps are complete, you can complete the installation through web browser by following instructions mentioned there on Manual:Config script page.