1 About This Document
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1.1 Purpose
The purpose of this document is to provide information about the major new features of PostgreSQL 12.
1.2 Audience
This document is written for engineers who already have knowledge of PostgreSQL, such as installation, basic management, etc.
1.3 Scope
This document describes the major difference between PostgreSQL 11 (11.5) and PostgreSQL 12 (12.0). As a general rule, this document examines the features of behavior change. This document does not describe and verify all new features. In particular, the following new features are not included.
Bug fix
Performance improvement by changing internal behavior
Improvement of regression test
Operability improvement by psql command tab input
Improvement of pgbench command
Improvement of documentation, modify typo in the source code
Refactoring without a change in behavior
1.4 Software Version
The contents of this document have been verified for the following versions and platforms.
| Software | Version |
|---|---|
| PostgreSQL | PostgreSQL 11.5 (for comparison) PostgreSQL 12 (12.0) (Sep 30, 2019 20:10:49) |
| Operating System | Red Hat Enterprise Linux 7 Update 5 (x86-64) |
| Configure option | –with-llvm –with-openssl –with-perl |
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1.5 Question, comment and Responsibility
The contents of this document are not an official opinion of Hewlett Packard Enterprise Japan Co, Ltd. The author and affiliation company do not take any responsibility for the problem caused by the mistake of contents. If you have any comments for this document, please contact Noriyoshi Shinoda (noriyoshi.shinoda@hpe.com) Hewlett Packard Enterprise Japan Co, Ltd.
1.6 Notation
This document contains examples of the execution of the command or SQL statement. Execution examples are described according to the following rules:
| Notation | Description |
|---|---|
| # | Shell prompt for Linux root user. |
| $ | Shell prompt for Linux general user. |
| Bold | The user input string. |
| postgres=# | psql command prompt for PostgreSQL administrator. |
| postgres=> | psql command prompt for PostgreSQL general user. |
| Underline | Important output items. |
The syntax is described in the following rules:
| Notation | Description |
|---|---|
| Italic | Replaced by the name of the object which users use, or the other syntax. |
| [ ] | Indicate that it can be omitted. |
| { A | B } | Indicate that it is possible to select A or B. |
| … | General syntax, it is the same as the previous version. |