#1273 - Unknown collation: 'utf8mb4_unicode_520_ci'

The problem is, the server that runs the live database is MySQL 5.7 that supports utf8mb4_unicode_520_ci but the test server I run is only MySQL 5.5 which does not support this specific encoding.

By the way, to check which version of MySQL you are running, run the following command:

mysql -V

The easiest way to fix this collation error is to upgrade MySQL 5.5 to either 5.6 or 5.7. Since the version of my test machine is Ubuntu 14.04, I can easily upgrade it to 5.6 by following:

sudo apt-get update
sudo apt-get upgrade
sudo apt-get install mysql-client-core-5.6
sudo apt-get install mysql-client-5.6
sudo apt-get install mysql-server-5.6

The restore went successfully once the server is upgraded to 5.6.

You may want to back up all databases and restore them back, in case anything goes wrong.

To back up all databases at once,

mysqldump --lock-all-tables -u root -p --all-databases > dump.sql

To restore them all once the server is upgraded,

mysql -u root -p < dump.sql

If upgrading MySQL isn’t an option for you, you will need to modify the backup file by replacing all utf8mb4_unicode_520_ci with utf8mb4_unicode_ci. Not ideal, but still works.

How does it work?

More specifically,

• Connect to your database.
• Refresh with the current structure of your database.
• Database Note Taker shows where documentation is missing.
• Add and edit notes for tables, columns, stored procedures and so on.
• Publish and distribute the documentation.
• When your database has changed, refresh and add new notes.

Features

Here are a few features worth mentioning:

• Separate documentation
• Work offline – a live database connection is only required to refresh the database.
• Publish to HTML
• Database platform independent
• Source control friendly
• Search
• Multiple developers friendly
• History tracking
• etc.

Not enough and looking for more database documentation options? Check out this list compiled by SQLShark.

Hold down the Compose icon in the lower right corner of your screen, and it’ll quickly jump to a list of your drafts. I use this feature all the time.

Press and hold your finger on the screen until you see a yellow square blink twice. A yellow icon that says “AE/AF Lock” will appear at the bottom of the screen letting you know that you’ve locked in the exposure and focus. It’ll stay that way until you’re done with the shot.

Also, do you know you can take multiple photo bursts all at once by simply holding down the capture button or the volume up/down button? your phone will take a series of rapid shots, or bursts, in quick succession. This is especially useful if you’re photographing a moving subject. Later you can scan through all the bursts and pick your favorite ones.

In the timer app, tap When Timer Ends → scroll down to the bottom and tap Stop Playing. The Timer will automatically turn off your tunes after whatever length of time you set.

Here is how you can change it to have these sub-folders also enabled for notification.

Go to Settings → Mails, Contacts, Calendars → Fetch New Data

Tap the mailbox you want to have sub-folders set for notification, and select them.

Go back and it’s all set. Next time when an email arrives into one of these sub-folders you will get notified right away.

Now, let’s just firmly hold your device and shake it. I am not joking. Just shake your it and you will get a popup like below. Tap undo, and bang.

Easy peasy, go into Camera, simply swipe the recording mode to the right. The slo-mo mode is at the very left.

After having a slo-mo video recorded, if you just download these videos to your computer, and play it in your media player, you won’t see a slow motion effect in the video. It will just play normally in regular speed.

The best way to save them properly before it gets downloaded to your computer is to use a free app called TruSloMo. You can use this app to save a slo-mo recorded video into a video that can be played regularly while still showing the slow motion effects.

/via Next of Windows/