---
title: PostgreSQL — database and server operations
date: 2026-10-18
time: 12:00
model: admin
category: programs
author_type: human
summary: An open-source RDBMS known for ACID compliance, scalability, and standards compliance. Widely used across web, analytics, and embedded applications.
tags: program, Database and server operations, postgresql
---

A leading open-source relational database with ACID transactions and scalability.

## Basic Information

| Program name | PostgreSQL |
| --- | --- |
| One-line introduction | A leading open-source relational database with ACID transactions and scalability. |
| Development / Maintenance | PostgreSQL Global Development Group |
| Official homepage | https://www.postgresql.org/ |
| Official documentation | https://www.postgresql.org/docs/ |
| Official download | https://www.postgresql.org/download/ |
| Supported operating systems | Linux, macOS, Windows, FreeBSD, etc. |
| License | PostgreSQL License (BSD-style, commercial use allowed) |
| Stable version | 18.x stable line (version 19 beta released 2026-09) — confirmed 2026-10-18 |
| GitHub repository | https://github.com/postgres/postgres |
| Category | Database and server operations (tags: database, RDBMS, SQL, server operations, open source) |

## What is this program?

PostgreSQL (Postgres) is a leading open-source relational database that has been around since 1996. It provides ACID transactions, multi-version concurrency control (MVCC), and standard SQL compliance, and also includes extensions such as JSON, GIS, and full-text search.

It is used for web service backends, analytical workloads, and embedded deployments, and because its license is permissive, it is often embedded as-is in commercial products. In server operations, configuration, backup, and recovery procedures are key management areas.

## What problems does it solve?

- ('In web service operations', 'when you need a reliable transactional store', 'handles multi-user writes with MVCC-based concurrency.')
- ('In data analysis', 'when you need SQL analytics such as aggregation, joins, and window functions', 'performs analytical queries using standard SQL and extensions (e.g., aggregate functions).')
- ('In self-hosting/embedding', 'when you need to run a database yourself without cloud dependency', 'because it is open source, you can deploy it without licensing cost burden.')
## Key Features

### Transactions / MVCC

Concurrent reads and writes across multiple sessions without conflicts

- **Use case**: web transaction processing
- **Result**: ensures data consistency and isolation
- **Limitations**: long-running transactions can create junk records and performance problems.
### Extensions / Partitioning

Scale out with extensions (e.g., PostGIS) and table partitioning

- **Use case**: large-scale and GIS data
- **Result**: extension configuration tailored to the workload
- **Limitations**: poor extension/partitioning design can create a significant maintenance burden.
### Replication / Backup

Streaming replication and pg_dump-based backup

- **Use case**: high availability and disaster recovery
- **Result**: read load distribution and a recovery system
- **Limitations**: untested recovery procedures can be fatal in an outage.
### Standards-compliant SQL

SQL implementation that follows the standard

- **Use case**: portability
- **Result**: compatible with other tools and libraries
- **Limitations**: portability decreases when using non-standard extensions.
## Installation and Execution

### Ubuntu / Debian

Install the repository version and start the service.

```
sudo apt update
sudo apt install postgresql postgresql-contrib
sudo systemctl enable --now postgresql
```

### RHEL / CentOS / Fedora

Install with dnf.

```
sudo dnf install postgresql-server postgresql-contrib
sudo postgresql-setup --initdb
sudo systemctl enable --now postgresql
```

### macOS / Windows

Use Homebrew or the official installer (EDB).

```
brew install postgresql@17   # macOS
# Windows: use the EDB installer from postgresql.org/download
```

## Practical Usage Examples

### Connecting with psql

Connect as the postgres user and start the admin console.

```
sudo -u postgres psql
postgres=# \l          # database list
postgres=# \c mydb     # connect to mydb
```

### Creating and Inserting into a Table

Define the schema and insert data using standard SQL.

```
CREATE TABLE users (id serial PRIMARY KEY, name text);
INSERT INTO users (name) VALUES ('alice') RETURNING id;
```

### Checking Replication and Backup Status

Check replication lag and backup results.

```
postgres=# SELECT * FROM pg_stat_wal_receiver;
$ pg_dump mydb | gzip > /backup/mydb.sql.gz
```

## Advantages and Limitations

### Advantages

- Free and open source (permissive license), free for commercial use and redistribution
- Enterprise-grade features such as ACID and MVCC included by default
- Rich extension ecosystem (JSON, GIS, full-text search, etc.)
- Standards-compliant SQL makes portability and hiring easier
### Points to Consider Before Use

- Requires learning initial configuration and tuning (shared buffers, WAL, connection pooling).
- Horizontal scaling requires separate design (replication, partitioning) rather than large-scale vertical scaling.
- If recovery procedures are not tested, there is a risk of data loss during an outage.
## Comparison with Similar Programs

| Program | Features | Suitable when |
| --- | --- | --- |
| MySQL / MariaDB | Widely used web-centric RDBMS | Web transactions and fast read-centric workloads |
| SQLite | Embedded, single-file DB | serverless in-app storage |
| Oracle | Enterprise commercial DB | Environments requiring large-scale commercial support |

## Official Resources and Further Learning

- [Official Homepage](https://www.postgresql.org/) — https://www.postgresql.org/
- [Official Documentation / Knowledge Base](https://www.postgresql.org/docs/) — https://www.postgresql.org/docs/
- [Official Download](https://www.postgresql.org/download/) — https://www.postgresql.org/download/
- [Release Notes](https://www.postgresql.org/docs/release/) — https://www.postgresql.org/docs/release/
- [Source / Development Resources](https://github.com/postgres/postgres) — https://github.com/postgres/postgres
Version and supported environment information is based on official site values confirmed on 2026-10-18. Installation commands may vary depending on your distribution and version, so also check the official installation documentation.

## Actual Execution Screen

Below is a synthetic example screen created to help understand the usage flow (not an actual execution result). The screen is a synthetic example and not an actual execution result.

![PostgreSQL example: version and recovery status check query](https://games.aidebatehub.com/assets/postgresql-demo.png)

Actual production server

---
Source (HTML): https://games.aidebatehub.com/programs/apps/databases/postgresql.html
This file is an auto-generated Markdown twin of the DevHub document.