practices Archives

Tech Optimizer

June 2, 2025

Streamline code conversion and testing from Microsoft SQL Server and Oracle to PostgreSQL with Amazon Bedrock

Organizations are transitioning from legacy database systems like Microsoft SQL Server and Oracle to open-source alternatives such as PostgreSQL to reduce costs and enhance scalability. This migration process involves several steps, including schema conversion, business logic transformation, data migration, application changes, and performance tuning. Amazon Bedrock aids this process by automating schema and code conversion, data transformation, identifying code compatibility issues, and generating test cases for validation. The migration challenges include adapting database objects to PostgreSQL's syntax, converting stored procedures and functions, executing ETL processes for data accuracy, modifying application code, and optimizing performance. Amazon Bedrock utilizes generative AI to simplify these tasks, significantly reducing manual effort and errors. An example of code conversion from Microsoft SQL Server to PostgreSQL is provided, illustrating how to convert a stored procedure into a PostgreSQL function while generating corresponding test cases. The process involves using the Amazon Bedrock chat interface to submit prompts for conversion and validation. To support the migration, table creation scripts for the Employees and SalaryUpdateLog tables are included, along with test data that covers various employee scenarios. This data allows for comprehensive testing of the converted function, ensuring it correctly applies salary updates based on specified criteria.

AppWizard

June 2, 2025

Vulnerabilities in Preinstalled Android Apps Expose PIN Codes and Allow Command Injection

Significant vulnerabilities have been identified in pre-installed applications on Ulefone and Krüger&Matz Android smartphones, disclosed on May 30, 2025. Three vulnerabilities affect these devices, including CVE-2024-13915, which targets the com.pri.factorytest application, allowing unauthorized factory resets. CVE-2024-13916 and CVE-2024-13917 affect the com.pri.applock application on Krüger&Matz smartphones, enabling malicious apps to extract user PIN codes and inject arbitrary intents. These vulnerabilities stem from improper export of Android application components, allowing malicious applications to bypass Android’s permission model. Users are advised to check for updates and consider disabling vulnerable applications.

Tech Optimizer

June 2, 2025

International authorities dismantle AVCheck in cybercrime operation

International authorities have dismantled AVCheck, a platform used by cybercriminals to test malware against antivirus software. The website avcheck.net now displays a seizure notice from the US Department of Justice, FBI, US Secret Service, and Dutch police. AVCheck was one of the largest counter antivirus services globally, aiding cybercriminals in evaluating their malware's stealth capabilities. Investigators found links between AVCheck's administrators and crypting services like Cryptor.biz and Crypt.guru. Law enforcement had placed a fake login page on AVCheck to warn users about legal risks before its shutdown on May 27, 2025. Undercover agents confirmed the illegal nature of AVCheck through transactions and connections to ransomware attacks. The FBI has also warned about the Silent Ransom Group, which has targeted law firms in the US using social engineering tactics.

AppWizard

June 2, 2025

8 Free Open Source Android Apps: Hidden Gems for a Better Phone

Enoch Boateng highlights eight standout open source Android apps that prioritize privacy, transparency, and functionality: 1. Mindful: A journaling app for mental well-being that supports text, voice, or photo entries, includes gratitude journaling, guided meditations, mood tracking, and security features like pin locks. 2. YTDL: A media downloader for videos and audio from over 1,000 websites, featuring batch downloads, metadata embedding, and privacy options like incognito mode. 3. ML Manager: An APK management app that allows extraction, backup, and sharing of apps, with batch extraction and integration with APK Mirror. 4. Loop Habit Tracker: A habit-building app with a forgiving scoring system, progress graphs, offline functionality, and an ad-free experience. 5. Shop Sync: A task management app for shopping lists with cloud syncing, offline access, and CSV export capabilities. 6. Snapsafe: A privacy-focused camera app that removes metadata, blurs faces, and offers customizable location tagging. 7. Booming Music: An offline music player with gapless playback, lyrics syncing, equalizer presets, and Android Auto compatibility. 8. Image Craft: An image editing toolkit that compresses, resizes, and converts images, offers batch operations, and creates password-protected archives.

Tech Optimizer

June 1, 2025

Supercharging vector search performance and relevance with pgvector 0.8.0 on Amazon Aurora PostgreSQL

The Amazon Aurora PostgreSQL-Compatible Edition has integrated support for pgvector 0.8.0, enhancing vector search capabilities significantly. This version achieves up to 9x faster query processing and delivers 100x more relevant search results compared to previous iterations. Key improvements in pgvector 0.8.0 include: - Up to 5.7x improvement in query performance for specific patterns. - Introduction of the iterative_scan feature, enhancing recall for filter queries requiring approximate nearest neighbor (ANN) index searches. - Improved cost estimation for more efficient query planning, allowing the selection of traditional indexes for complex filtered searches. - Flexible performance tuning with two modes for iterative_scan: relaxed_order and strict_order. Previous versions faced challenges with overfiltering, where combining vector similarity search with traditional SQL filters resulted in fewer results than expected. The HNSW indexing algorithm accelerates vector similarity searches by creating a multi-layered graph structure for efficient navigation. Iterative index scans in pgvector 0.8.0 improve query reliability and performance by applying filters during the scanning process, reducing false negatives and enhancing performance. The configuration options for iterative scanning include off, strict_order, and relaxed_order, with relaxed_order providing the best balance between performance and accuracy. In performance tests, pgvector 0.8.0 demonstrated substantial improvements across various query patterns, with significant enhancements in result completeness and recall. The database can now efficiently handle enterprise-scale applications, such as e-commerce and recommendation systems, with high performance and result quality even as product catalogs expand. Best practices for deploying pgvector 0.8.0 include using HNSW with recommended parameters, creating additional indexes on commonly filtered metadata columns, and tuning query parameters based on specific use cases. Operational best practices involve using Graviton4-based instances for optimal performance, monitoring and tuning slow vector queries, and considering partitioning for very large tables.

AppWizard

May 31, 2025

I switched to indie apps for privacy, and now my workflow is a mess

The attempt to send a file from an Android device to a Windows 11 PC highlighted the challenges of using independent applications instead of major tech tools. The user replaced several Google services with alternatives, including Sync for cloud storage, Obsidian for note-taking, ToDoist for task management, Elemental for chat, Kobo for ebooks, VLC for music, Firefox for browsing, Ecosia for search, and Fastmail for email. Fastmail was noted for its efficiency and privacy, while Sync was criticized for its reliability. The user found the experience of using multiple independent apps to be fragmented and cumbersome, leading to higher costs than anticipated. Despite ethical concerns about Big Tech, the integration and convenience they offer were acknowledged as significant advantages. Ultimately, Fastmail and ToDoist were retained, while the user returned to Google for some services, illustrating the difficulties of maintaining a fully independent digital life.

Tech Optimizer

May 29, 2025

How to turn off antivirus

Antivirus software is crucial for digital security, providing protection against malware threats. Users may need to disable antivirus temporarily for reasons such as system resource consumption, particularly during resource-intensive tasks like gaming, or to bypass false positives when installing applications. Disabling antivirus software poses risks, especially when browsing the internet, as even legitimate sites can be compromised. Precautions to take when disabling antivirus include disconnecting from the internet, avoiding USB drives, using trusted networks, closing non-essential applications, verifying the legitimacy of downloaded files, and limiting browsing to secure websites. Users should promptly re-enable their antivirus after completing necessary tasks.

Winsage

May 29, 2025

Machines running Windows 10 — even the latest version of 22H2 — will no longer receive security patches and updates. While Windows 10 will continue to function, it won’t be secure.

October 14, 2025, marks the end of support for Windows 10, meaning devices running this OS will stop receiving security patches and updates. Since the end of 2022, Windows 10 has only received security patches without new features. While it will continue to function, its security will be compromised. Organizations may need to consult IT professionals before relying on unsupported operating systems. It is also advisable to assess older infrastructure that may depend on outdated operating systems. Upgrading to Windows 11, specifically version 24H2, is recommended before the October 2025 deadline, as unsupported operating systems pose significant security risks.

Winsage

May 29, 2025

This is what data your Windows PC is actually sending back to Microsoft

Windows collects telemetry data, which includes hardware specifications, installed software, and system events, but does not reveal personally identifiable information. This data is encrypted and sent via HTTPS during significant events like system crashes. Users can manage optional data collection settings during initial setup or in the Privacy section of the Settings app, with enterprise versions offering more control. Mandatory data collection in Windows is more extensive than in macOS, while Linux has minimal data collection due to its decentralized structure. Users can disable some data collection, but some information will always be gathered unless advanced measures are taken.

AppWizard

May 28, 2025

Perspective – Why online privacy is vital: Insights from messaging app Signal’s president

Meredith Whittaker, president of Signal, emphasized the need for enhanced personal data protection and criticized major tech companies for their pervasive data collection practices with minimal oversight. She called for structural reforms to regulate user data management and highlighted that a few tech giants dominate data collection without adequate transparency. Whittaker advocated for comprehensive regulations to safeguard user privacy and protect free speech, reflecting growing concerns among consumers and privacy advocates about the balance between technology and individual rights.