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mysql 8 innodb clustering - adding instance fails with error “Unknown database 'mysql_innodb_cluster_metadata'”

I'm setting up my first mysql innodb cluster, following the instructions here: https://dev.mysql.com/doc/refman/8.0/en/mysql-innodb-cluster-production-deployment.html I've configured the instances ...
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mysql cluster with 1 master 1 node and 2 slave

My Query is I want to set up MySQL cluster with 1 Master 1 Node and 2 Slave with Auto failover. If my master is down node should assign slave as a master. Can anyone suggest me an idea to do that? As ...
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How to do rolling upgrade MariaDB 10.0 -> 10.1 on ubuntu 14

I'm trying to figure out how to do a rolling upgrade of our galera cluster running on MariaDB on Ubuntu 14.04. In testing, the first node I upgraded started complaining about the timestamp column in ...
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How can I be sure if MongoDB is doing the balance?

I have the following structure: Two Ubuntu 14.04.2, both with MongoDB v3.0.4 instaled. Both in the same LAN. I want to make them work as a cluster. In the first one, that I call "MC1", I run the ...