svnadmin upgrade — Upgrade a repository to the latest supported schema version.
svnadmin upgrade REPOS_PATH
Upgrade the repository located
REPOS_PATH to the latest
supported schema version.
This functionality is provided as a convenience for repository administrators who wish to make use of new Subversion functionality without having to undertake a potentially costly full repository dump and load operation. As such, the upgrade performs only the minimum amount of work needed to accomplish this while still maintaining the integrity of the repository. While a dump and subsequent load guarantee the most optimized repository state, svnadmin upgrade does not.
You should always back up your repository before upgrading.