=== Perform the database upgrade ===
+As of 1.21, it is possible to separate schema changes (i.e. adding,
+dropping, or changing tables, fields, or indices) from all other
+database changes (e.g. populating fields). If you need this
+capability, see "From the command line" below.
+
==== From the web ====
If you browse to the web-based installation script (usually at
tables, update existing tables, and move data around as needed. In most cases,
this is successful and nothing further needs to be done.
+If you need to separate out the schema changes so they can be run
+by someone with more privileges, then you can use the --schema option
+to produce a text file with the necessary commands. You can use
+--schema, --noschema, $wgAllowSchemaUpdates as well as proper database
+permissions to enforce this separation.
+
=== Check configuration settings ===
The names of configuration variables, and their default values and purposes,