Key PostgreSQL Queries to Detect Silent Database Degradation Early

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A technical guide published on DEV Community outlines how PostgreSQL databases can degrade silently without triggering standard monitoring alerts. Common culprits include table bloat from unvacuumed dead tuples, unused indexes slowing down writes, and open transactions holding locks. The article provides diagnostic SQL queries compatible with PostgreSQL 13 and newer, requiring no external agents or paid tools. Developers are advised to use built-in views like pg_stat_user_tables and the pg_stat_statements extension to identify problem areas. Remediation options discussed include tuning autovacuum settings and using pg_repack for safe table compaction in production environments.

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LTspice Study Compares I-V Characteristics of BJT and MOSFET Transistors

A study used LTspice simulation software to analyze and compare the electrical characteristics of two fundamental transistor types: the BJT and the MOSFET. The BJT, a current-controlled device, showed flat collector current curves in the active region with evenly spaced intervals as base current increased, reflecting a consistent amplification ratio. The MOSFET, a voltage-controlled device, exhibited nonlinear square-law behavior, with drain current curves spacing out increasingly wider as gate-source voltage rose in equal steps. Physically, the BJT relies on minority carrier diffusion through a thin base region, while the MOSFET operates by forming an inversion layer channel via a gate-induced electric field. The experiment highlighted key differences in how each device controls current, underscoring their distinct roles in electronic circuit design.

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ProgrammingDEV Community ·

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ProgrammingDEV Community ·

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ProgrammingDEV Community ·

Newsjack Offers 18 Free PR Skills for Claude, Including Overnight News Monitoring

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