Note that the database schema is automatically upgraded when needed. All you need to do is to ensure your xwiki.cfg file is correctly configured to perform the migration. Here's a relevant excerpt from the xwiki.cfg file:

#-# Whether migrations are enabled or not. Should be enabled when upgrading, but for a better startup time it is better to
#-# disable them in production.
xwiki.store.migration=1

#-# Whether to exit after migration. Useful when a server should handle migrations for a large database, without going
#-# live afterwards.
# xwiki.store.migration.exitAfterEnd=0

#-# Indicate the list of databases to migrate.
#-# to upgrade all wikis database set xwiki.store.migration.databases=all
#-# to upgrade just some wikis databases set xwiki.store.migration.databases=xwiki,wiki1,wiki2
#-# Note: the main wiki is always migrated whatever the configuration.
# xwiki.store.migration.databases=
From a failed migration the database tables DATABASECHANGELOG and DATABASECHANGELOGLOCK may be left over.
Ensure that these tables are dropped before restarting a failed migration.
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Created by Vincent Massol on 2017/09/06
   

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