PostgreSQL Concepts: Difference between revisions

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* [[PostgreSQL#Subjects|PostgreSQL]]
* [[PostgreSQL#Subjects|PostgreSQL]]
=Connection Types=
==Local Socket==
This is the default type of connection, then the psql client is collocated with the database.
==TCP==


=Database=
=Database=

Revision as of 18:26, 4 December 2018

Internal

Connection Types

Local Socket

This is the default type of connection, then the psql client is collocated with the database.

TCP

Database

A PostgresSQL usually comes with 4 pre-existing databases (postgres, admin, template0, template1). "postgres" is fit for general use and it should be used by default.

Schema

Each database has by default a public schema.

Tablespace

Authentication

User

Users are shared across databases.

The "user" concept is equivalent with the "role" concept. They mean the same thing.

User Operations

Role

The "role" concept is equivalent with the "user" concept. They mean the same thing.

Role Attributes

A specific role may:

  • be a superuser
  • create another role
  • create a database

Data Types

Identity

Timestamp

Numeric Types

SMALLINT

2 byte integer.

INT

4 byte integer. This is a typical choice for integers.

BIGINT

8 byte integer.

DECIMAL

NUMERIC

REAL

DOUBLE PRECISION

SERIAL

BIGSERIAL

TODO