PG-Development on PIGSTY

PostgreSQL Convention 2024

Wed, 09 Oct 2024 00:00:00 +0000

No rules, no standards. Some developer conventions for PostgreSQL 16. Read more

AI Large Models and Vector Database PGVector

Wed, 10 May 2023 00:00:00 +0000

This article focuses on vector databases hyped by AI, introduces the basic principles of AI embeddings and vector storage/retrieval, and demonstrates the functionality, performance, acquisition, and application of the vector database extension PGVECTOR through a concrete knowledge base retrieval case study. Read more

Implementing Advanced Fuzzy Search

Fri, 05 Mar 2021 00:00:00 +0000

How to implement relatively complex fuzzy search logic in PostgreSQL? Read more

Frontend-Backend Communication Wire Protocol

Tue, 12 Nov 2019 00:00:00 +0000

Understanding the TCP protocol used for communication between PostgreSQL server and client, and printing messages using Go Read more

Transaction Isolation Level Considerations

Tue, 12 Nov 2019 00:00:00 +0000

PostgreSQL actually has only two transaction isolation levels: Read Committed and Serializable Read more

CDC Change Data Capture Mechanisms

Wed, 12 Jun 2019 00:00:00 +0000

Change Data Capture is an interesting ETL alternative solution. Read more

Locks in PostgreSQL

Tue, 11 Jun 2019 00:00:00 +0000

Snapshot isolation does most of the heavy lifting in PG, but locks still matter. Here’s a practical guide to table locks, row locks, intention locks, and pg_locks. Read more

O(n2) Complexity of GIN Search

Fri, 12 Apr 2019 00:00:00 +0000

When GIN indexes are used to search with very long keyword lists, performance degrades significantly. This article explains why GIN index keyword search has O(n^2) time complexity. Read more

GeoIP Geographic Reverse Lookup Optimization

Sat, 07 Jul 2018 00:00:00 +0000

A common requirement in application development is GeoIP conversion - converting source IP addresses to geographic coordinates or administrative divisions (country-state-city-county-town-village) Read more

PostgreSQL Trigger Usage Considerations

Sat, 07 Jul 2018 00:00:00 +0000

Detailed understanding of trigger management and usage in PostgreSQL Read more

PostgreSQL Development Convention (2018 Edition)

Wed, 20 Jun 2018 00:00:00 +0000

Without rules, there can be no order. This article compiles a development specification for PostgreSQL database principles and features, which can reduce confusion encountered when using PostgreSQL. Read more

Efficient Administrative Region Lookup with PostGIS

Wed, 06 Jun 2018 00:00:00 +0000

How to efficiently solve the typical reverse geocoding problem: determining administrative regions based on user coordinates. Read more

KNN Ultimate Optimization: From RDS to PostGIS

Wed, 06 Jun 2018 00:00:00 +0000

Ultimate optimization of KNN problems, from traditional relational design to PostGIS Read more

Distinct On: Remove Duplicate Data

Fri, 06 Apr 2018 00:00:00 +0000

Use Distinct On extension clause to quickly find records with maximum/minimum values within groups Read more

Function Volatility Classification Levels

Fri, 06 Apr 2018 00:00:00 +0000

PostgreSQL functions have three volatility levels by default. Proper use can significantly improve performance. Read more

Implementing Mutual Exclusion Constraints with Exclude

Fri, 06 Apr 2018 00:00:00 +0000

Exclude constraint is a PostgreSQL extension that can implement more advanced and sophisticated database constraints. Read more

Implementing Cache Synchronization with Go and PostgreSQL

Thu, 03 Aug 2017 00:00:00 +0000

Cleverly utilizing PostgreSQL’s Notify feature, you can conveniently notify applications of metadata changes and implement trigger-based logical replication. Read more

Auditing Data Changes with Triggers

Fri, 09 Jun 2017 00:00:00 +0000

Sometimes we want to record important metadata changes for audit purposes. PostgreSQL triggers can conveniently solve this need automatically. Read more

Building an ItemCF Recommender in Pure SQL

Wed, 05 Apr 2017 00:00:00 +0000

Five minutes, PostgreSQL, and the MovieLens dataset—that’s all you need to implement a classic item-based collaborative filtering recommender. Read more

UUID Properties, Principles and Applications

Sun, 06 Nov 2016 00:00:00 +0000

UUID properties, principles and applications, and how to manipulate UUIDs using PostgreSQL stored procedures. Read more