Sorted:

What type of data persistence does Redis support?

How can I check the data storage location of Redis?

How to handle a large number of concurrent read and write requests in Cassandra?

How to handle the issues of node failure and data recovery in Cassandra?

What are the replication strategies available in Cassandra?

What types of data does Cassandra support?

How can data pagination be implemented in Cassandra?

What is the security mechanism of Cassandra?

What is the principle of data locality in Hadoop?

What are the steps to setting up a PostgreSQL cluster?