Explain about concurreny with the help of MVCC?

How to created a database?

How to list the number of database?

How to take backup of database?

How to create a PostgreSQL user?

Explain multi version concurrency control.

How to delete/drop an existing postgresql database?

What is maximum size of table in postgresql?

What is write ahead logging in postgresql?

How to start, stop and restart postgresql database?

How the stats updated in postgresql?

How to start database server in postgresql?

How to stop database server in postgresql?

How to setup postgresql sysv startup script?

How do I get a list of databases in a postgresql database?