Without further ado, above
Database Cluser: a cluster of databases. A set of PostgreSql is installed and deployed on a server. You can create a Database and a User. User: a database User used to connect to and access the database. The User can control the access to different data through permission management. Database: Logical isolation under Database Cluser. Multiple databases can be created in a Database cluster. To communicate with each other, you need to use dBLINK or FDW technology. After the database cluster is installed and deployed, postgres, TEMPLate0, and TEMPLate1 databases are provided by default. Schema: Mode, database under the logical partitioning, a database can create multiple mode under different under the same database model can visit each other before, model based object stored in the database (the business that is commonly used in the tables, views, indexes, triggers, stored procedures, etc.), different patterns can be stored objects, the basis of the same name with the schema name when you visit, Such as in table1, schema2. Table1.