🔹 What is PostgreSQL?
PostgreSQL (often called Postgres) is an open-source relational database management system (RDBMS) known for:
✅ ACID compliance – Ensuring data consistency
✅ Extensibility – Supporting custom functions, data types, and procedural languages
✅ Advanced indexing – Including GIN, BRIN, and full-text search
✅ Replication & partitioning – Enabling high availability and scalability
✅ JSON & NoSQL support – Allowing semi-structured data storage
PostgreSQL is widely used in enterprise applications, data warehousing, and analytics due to its reliability and performance.
📌 PostgreSQL Naming Conventions
Following a consistent naming convention in PostgreSQL is crucial for readability and maintainability. Here are best practices:
🔹 Database & Schema Naming:
Use lowercase names: customer_db, sales_schema
Avoid special characters and spaces
Use snake_case: order_items, employee_data
🔹 Table Naming:
Use singular names: user, invoice, product
Prefix for clarity if needed: app_users, finance_transactions
🔹 Column Naming:
Keep it descriptive but short: first_name, created_at
Avoid reserved keywords
🔹 Index Naming:
Include table & column name: idx_users_email, idx_orders_date
🔹 Constraint Naming:
Follow a pattern: chk_orders_status, fk_orders_customer_id
Following these conventions helps in avoiding conflicts and makes queries more readable.
📏 PostgreSQL Limits You Should Know
Understanding PostgreSQL limits is essential for database design and performance optimization. Here are key constraints:
🔹 Max Table Size: 32 TB
🔹 Max Row Size: 1.6 TB
🔹 Max Column per Table: 1,600
🔹 Max Index per Table: Unlimited (practically constrained by storage)
🔹 Max Connections: Default 100 (can be increased)
Knowing these limits helps in designing scalable high-performance applications! 🚀
🛠 Understanding PostgreSQL Page Layout
PostgreSQL stores data in pages (also called blocks) of 8 KB each. Every table and index is made up of these pages. Here’s how a PostgreSQL page is structured:
🔹 Header (24 bytes) – Stores metadata about the page
🔹 Item Pointer Array – Index pointing to tuples (rows)
🔹 Tuple Data – Actual row data
🔹 Free Space – Available space for future updates