Fedora 10 includes MySQL 5.0.67-2.
The MySQL user is strongly encouraged to study the release notes for MySQL (http://dev.mysql.com/doc/refman/5.0/en/releasenotes-cs-5-0-67.html) before upgrading his MySQL databases.
Fedora 10 includes postgresql 8.3.4-1.
If you are migrating from Fedora 9, no special action should be required. However, migration from versions of postgres prior to 8.3.1 may require special steps. Be sure to check the Postgres release notes (http://www.postgresql.org/docs/8.3/static/release-8-3-4.html) before performing the migration.