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Artículos relevantes de tecnología, traducidos y resumidos en español. Actualizamos cada 6 horas.
How to Copy and Sync a Local MongoDB Collection to Atlas
Moving data from a local MongoDB database to Atlas usually means exporting files, importing them again, and repeating the same process when something changes. I wanted to test a simpler way in VisuaLeaf: copy a local collection to MongoDB Atlas and keep the Atlas collection updated automatically. Fo
PostgreSQL 58030 Error: Causes and Solutions Complete Guide
PostgreSQL Error 58030: io error — Causes, Fixes, and Prevention PostgreSQL error code 58030 (io error) is a critical system-level error indicating that the database server encountered a fatal input/output failure while reading from or writing to the file system. This error is classified under the
Oracle ORA-01519 Error: Causes and Solutions Complete Guide
ORA-01519: Error While Processing File Near Line — Causes, Fixes & Prevention ORA-01519 is an Oracle database error that occurs when the database engine encounters a problem while processing a SQL script or initialization file at or near a specific line number. It typically surfaces during databas
Code Query 1000x Faster, Token Costs Slashed to 1%: This Tool Blew My Mind
Let me be honest — I got completely hooked 😱 Recently I stumbled upon a tool called codebase-memory-mcp, and it has genuinely elevated my coding efficiency by several levels. Here's the deal 👇 Whenever I use AI to write code, the most frustrating part is passing context. Once a project grows large
Design Pattern // The Architecture of an ETL Process — How to Isolate Bad Data Cleanly
A single date string that cannot be parsed, and the entire ETL run aborts. The design pattern for ETL process architecture presented here prevents exactly that: bad data is isolated, not passed along. TL;DR — what this article covers: Work packages and schema layering E0 – L2 — how to decompose the
Connecting Power BI to PostgreSQL: A Step-by-Step Guide for Beginners.
Introduction. Power BI is one of the most popular tools for transforming raw data into interactive dashboards and reports. Many beginners start by importing Excel files, big organizations often store their data in relational databases such as PostgreSQL. Connecting Power BI directly to PostgreSQL
Hacker wipes Romania's land registry database
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The Index Won't Save You: Debugging a Slow Derived Table in MySQL
Twenty rows. Over 500ms. That's the kind of mismatch that makes you stop what you're doing and open EXPLAIN. Our team ran into exactly this while working on a client's Laravel application, and it's a good enough example that we wanted to share the process. Before we dive in If you're already comfort
Stop Using OpenCode
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The EU is about to sell our most sensitive data to the US for visa-free travel
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Building a right-click 'query this file' workflow in VS Code with DuckDB
Every data engineer has probably faced this workflow: someone shares a Parquet or CSV file, you need to answer one question, and you end up opening a notebook and writing boilerplate just to inspect it. DuckDB already makes querying files easy, but I wanted that workflow directly inside VS Code. So
The Leading Zero Taught Me More
My SQL learning log; from "why is my zero gone" to joining four tables without blinking A few weeks ago, I ran a simple query: SELECT * FROM customers; And stared at this: No error. No warning. Just... gone. That one broken row taught me more about how SQL actually thinks than any tutorial had up t
Lease Email Jobs Before Your Worker Sends
Duplicate auth emails are rarely caused by one big bug. More often, the API is fine, the queue is fine, and the worker logic is almost fine. Then a timeout lands between "picked job" and "marked sent", another worker retries, and a user gets two reset links. That kind of issue is annoyng because eac
How to Export Xero Data to a Database
Compare 5 ways to export Xero data to a database: CSV report exports, the Xero API, Zapier, ETL platforms, and no-code sync. Honest pros, cons, and costs. By Ilshaad Kheerdali · 20 July 2026 If you run your accounting on Xero, you've probably hit a wall trying to get the data out. There is no one-cl
Airport Simulator
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Oracle ORA-01516 Error: Causes and Solutions Complete Guide
ORA-01516: Nonexistent Log File, Data File, or Temporary File ORA-01516 is an Oracle error that occurs when a command references a log file, data file, or temporary file that does not exist or cannot be located by the database. This typically happens when an invalid file number is supplied to ALTE
PostgreSQL a scala “planetaria”: l’architettura semplice (ma disciplinata) per reggere carichi enormi
Un primario per le scritture, decine di repliche in lettura, cache davanti al DB e pooling aggressivo: come rendere sostenibile un workload soprattutto read-heavy senza shardare tutto. Quando un’app cresce rapidamente, quasi sempre succede la stessa cosa: la prima versione “naïf” dell’architettura (
RocheDB Is Now KoutenDB
RocheDB has been renamed to KoutenDB. This is the main change in KoutenDB v0.8.0, a naming and migration release. Release: https://github.com/puffball1567/koutendb/releases/tag/v0.8.0 Kouten comes from the Japanese word kouten (公転), meaning orbital The name fits the database model more directly. Kou
Serverless Without Limits: How a Static Web App Can Fully Operate with Databases
There is a persistent misconception that pure client-side applications (Single Page Applications, SPAs) operating without their own dedicated backend and hosted on free hosting platforms like GitHub Pages are doomed to isolation. It is widely assumed that their absolute limit is storing user data in
Building a desktop app for repetitive Excel and CSV work
I’ve been building Fuga, a Windows desktop app for repetitive Excel and CSV work. The basic idea is simple: open a spreadsheet, type what you want done, and the app creates the needed tables, charts, or summaries. I started working on it because a lot of spreadsheet work is not especially hard, but
Exploit brokers pay $500k for WordPress RCEs. I found one with GPT5.6 and $25
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Optimizing Database Performance for Developers
What You'll Need To get started with optimizing database performance, you'll need to have a few tools at your disposal. First, you'll need a workflow automation platform like n8n Cloud or a self-hosted n8n instance. This will allow you to automate tasks and workflows, taking some of the load off y
Du Navigateur à la Base de Données : Le Chemin le Plus Court pour les Tableaux Web
Vous avez trouvé des données sur un site web. Vous en avez besoin dans votre base de données. Quel est le chemin le plus rapide du point A au point B ? Ce guide couvre les workflows pratiques pour importer des tableaux HTML dans SQLite, PostgreSQL, MySQL et d'autres bases de données — avec un minimu
Accounting System Malaysia: The Complete Guide for Modern Businesses
Managing business finances has become more challenging than ever. Whether you operate a startup, SME, or an established enterprise, choosing the right accounting system Malaysia businesses trust can significantly improve efficiency and financial accuracy. Modern accounting software is no longer just
PostgreSQL HOT Updates: When UPDATE Avoids Touching Indexes
Introduction In the last article, we saw why an index-only scan can still fetch from the heap. This time, let us follow the write path in the opposite direction. An UPDATE in PostgreSQL does not overwrite a row in place. Under MVCC, it creates a new row version. That new version may also require f
PostgreSQL 57P05 Error: Causes and Solutions Complete Guide
PostgreSQL Error 57P05: idle_session_timeout Explained PostgreSQL error code 57P05 is raised when a client session remains idle (connected but sending no queries) for longer than the duration configured in the idle_session_timeout parameter, introduced in PostgreSQL 14. When the timeout expires, t
Oracle ORA-01510 Error: Causes and Solutions Complete Guide
ORA-01510: Error in Deleting Log File — Causes, Fixes & Prevention ORA-01510 occurs when Oracle fails to physically delete a redo log file during an ALTER DATABASE DROP LOGFILE operation. While the logical removal from the control file may succeed, the actual OS-level file deletion encounters an o
Cache invalidation is the dual-write problem
Cache invalidation, in the form most backends actually meet it, is not a unique problem. It is the dual-write problem — the failure mode covered in the transactional outbox article — in different clothing: // the dual-write problem, messaging edition await db.insert(orders).values(input); //
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Building SaarDB, Part 3: Compaction
In Parts 1 and 2, we built a storage engine: WAL for durability and LSM tree for efficient disk reads. This works. But there is a problem growing quietly in the background. Every memtable flush creates a new SSTable file. After 10 flushes, you have 10 files. After 1000 flushes, you have 1000 files.
LoRA Speedrun – a public wall-clock leaderboard for fine-tuning techniques
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NOT IN returned zero rows. It wasn't your data — it was one NULL.
Originally published at nlqdb.com/blog "Which customers never placed an order?" is a question you ask constantly — products never sold, users with no login this month, invoices with no payment. It's a set difference, and the obvious query is a quiet trap: SELECT * FROM customers WHERE id NOT IN (SEL
Designing a Time-Series Database: Compression, Cardinality, and Retention
Ask an engineer to design a database and they reach for the tools they know: rows, a B-tree index, a mix of reads, updates, and deletes on individually addressable records. That instinct is correct for most systems and wrong for this one. A time-series database is built around a workload so lopsided
LEARNING SQL
So, I Had to Run a School This Weekend (A SQL Story) No pressure, right? Here is how it went down. The wins, the face-palm moments, and why CASE WHEN is officially my new favorite thing. Step 1: The Setup (DDL - Building the Sandbox) Writing out all those CREATE TABLE statements was pretty straightf
During an incident, ChatGPT should gather evidence, not become root
During an incident, the expensive part is rarely writing one SQL query. It is preserving the same service, environment, tenant, deployment, and time window while responders move between errors, changes, health events, and runbooks. A ChatGPT database connection can help maintain that context. It sho
Your MCP connection pool is an admission-control system
An MCP database server can be read-only, well scoped, and still take production down. The failure path is familiar: several agents call tools at once each tool borrows a database connection a few queries run longer than expected the pool fills callers queue retries turn a burst into sustained pressu
Moonshine: Lets you stream games from your PC to any device running Moonlight
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Tumaini Migrates To The Cloud!
Introduction Most schools in Kenya decided to migrate to the online platforms because of COVID-19. The change was necessary so that learning could proceed as usual. Schools contracted information technologists to start the migration from physical to digital learning such as Google classroom and Zo
PostgreSQL 57P04 Error: Causes and Solutions Complete Guide
PostgreSQL Error 57P04: database dropped PostgreSQL error 57P04 (database dropped) occurs when a client's active connection is invalidated because the database it was connected to has been deleted using DROP DATABASE. This is a critical, non-recoverable connection error — once the database is gone
Oracle ORA-01507 Error: Causes and Solutions Complete Guide
ORA-01507: Database Not Mounted — Causes, Fixes, and Prevention What Is ORA-01507? ORA-01507 occurs when an Oracle command requiring the database to be in MOUNT or OPEN state is executed while the database is still in the NOMOUNT (instance started) state. Oracle startup follows three se
Your First Oracle Autonomous Database on OCI Always Free
The single best way to keep your Oracle skills sharp without a license, a server, or a finance OCI Always Free. It gives you a real, fully managed Oracle database — Autonomous 23ai release — that stays free indefinitely. It's the ideal sandbox: a Here's how to stand one up in a few minutes, what's g
When to Use an ORM vs SQL and Query Builders
ORMs like Prisma and Hibernate are excellent for simplifying basic CRUD operations. However, for complex queries involving window functions, CTEs, or deep joins, ORMs often get in the way. For advanced use cases, learning SQL first and using a modern query builder like Drizzle offers the perfect bal
Playground: Test Smarter, Not Harder in Oracle AI Agent Studio
Oracle AI Agent Studio | Series: Hands-On with Agent Studio Tools Ever spent 10 minutes running an entire agent flow end-to-end, just to test one tiny prompt tweak? If you have, you know that particular flavor of pain. The good news: Oracle AI Agent Studio's Edit in Playground feature was built prec
How I burned through Supabase's free egress limit (5GB 10.26GB) with polling and select=*
TL;DR Supabase free plan: 5GB egress/month My project: 10.26GB (205% over limit) Root cause: 5-second polling × select('*') on a table with a 200,000-char text column Fix: generated column flag + select column restriction + visibilitychange polling stop My KOBO project (issue-finder) had a collec
Does Prisma respect Supabase RLS? No — here's why
Prisma and Drizzle connect as the postgres role and bypass Supabase RLS entirely, so your policies never protect ORM queries. Here's the fix. TL;DR: No. Prisma and Drizzle open their own direct Postgres connection and log in as the postgres role, which owns your tables and carries BYPASSRLS — so Row
Optimizing Large-Scale MongoDB Aggregation Pipelines for Performance
Originally published on tamiz.pro. MongoDB's aggregation framework is a powerful tool for processing and transforming data. However, as datasets grow, poorly optimized aggregation pipelines can quickly become performance bottlenecks. This deep-dive explores advanced strategies and best practices for
Learning Python by Building a Discord Bot
What I built A expense tracking Discord bot for groups. It lets a server team register members, log shared expenses and repayments, inspect balances, view transaction history, and export records to CSV. The main reason was to get hang of python language. I am someone who learns by doing. So, when
Day 86: Faster Map Key Lookups in ClickHouse® 26.3 with Bucketed Map Serialization
Semi-structured data has become a standard part of modern analytics. Whether you're storing application logs, telemetry, user attributes, event metadata, or feature flags, it's common to encounter records where every row contains a different set of key-value pairs. ClickHouse® provides the Map data
HMD Touch 4G
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Database from Scratch Using PostgreSQL
Building a School Database from Scratch Using PostgreSQL Introduction Databases play an important role in storing, organizing, and managing information efficiently. Educational institutions such as schools handle large amounts of data, including student details, subjects, and academic p