If you are running a ownCloud installation, you're going to use it. And after a while it's not only you using it. Your wife/husband will use it, your relatives and your friends for sure. Just because it is working and it is not only you who wants to share content but them as well - probably content you requested them to share with you. BTW, and just in case if you are not aware of, the ownCloud Android app can upload your pictures taken with your device instantly.
Ok, so what's the problem with sqlite? Locking! If you have some users, some Androids, some iOS devices and some shared links your ownCloud will definitely be slow. So you have to migrate. My first attempt was to migrate the data directory. But then you've to create all of your users manually. Remember the relatives, the friends and your wife/husband. If you want to avoid setting new passwords and telling them, you're going to change something (which might sometimes be a good idea, because they might tell you that they do not need the account any longer because they moved to their own-ownCloud), you want to migrate the database as well. This part turned out to be the hardest and was not possible without investing hours into a database migration.
Just before I migrated my ownCloud (6.something) to a different server, I updated it to version 188.8.131.52. This update was the very best update of my ownCloud installation (moving from 5 to 6 was like a mess). The admin interface told me I should migrate the database with this simple command:
./occ db:convert-type mysql owncloud localhost owncloudTo be fair, it told me to use "occ db:convert-type" but this echos
db:convert-type [--port="..."] [--password="..."] [--clear-schema] [--all-apps] type username hostname databaseSo my database migration took me 7 minutes and now I can move the whole installation to my new server - hopefully my puppet integration allows me to do this without much effort.
BTW, occ offers some cool stuff for administrating your ownCloud. I've not yet tried them all, but they look very useful to me:
# ./occ ownCloud version 7.0.1 Usage: [options] command [arguments] Options: --help -h Display this help message. --quiet -q Do not output any message. --verbose -v|vv|vvv Increase the verbosity of messages: 1 for normal output, 2 for more verbose output and 3 for debug --version -V Display this application version. --ansi Force ANSI output. --no-ansi Disable ANSI output. --no-interaction -n Do not ask any interactive question. Available commands: help Displays help for a command list Lists commands status show some status information upgrade run upgrade routines app app:disable disable an app app:enable enable an app app:list List all available apps db db:convert-type Convert the ownCloud database to the newly configured one db:generate-change-script generates the change script from the current connected db to db_structure.xml files files:scan rescan filesystem ldap ldap:set-config modifies an LDAP configuration ldap:show-config shows the LDAP configuration ldap:test-config tests an LDAP configuration maintenance maintenance:mode set maintenance mode maintenance:repair repair this installation maintenance:singleuser set single user mode user user:lastseen shows when the user was logged it last time user:report shows how many users have access user:resetpassword Resets the password of the named user