unix
6 minUnix file publication: replace names without exposing partial bytes
Separate atomic visibility from crash durability when publishing local files.
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6 matching resultsArticles and interview answers
Q&A
Q&AWhat does atomic file replacement leave unchanged for existing readers?
An already open descriptor still refers to the old file object.
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Write a complete temporary file on the same filesystem and replace the pathname. New opens see the replacement; existing descriptors keep the old object. Durability and concurrent-writer coordination are separate guarantees.
databases
6 minSQL keyset pagination: continue an order without promising a snapshot
Use a unique ordering tuple and a deliberate visibility policy for reliable page traversal.
Q&A
Q&AHow can you tell a DNS failure from a TCP connectivity failure?
Resolve the name from the failing runtime, then test the returned address and port separately.
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Use the system resolver path, for example getent hosts, and compare with a direct DNS query. If a correct address resolves but the connection fails, investigate route, listener, firewall, or protocol behavior. Run diagnostics inside the same container or namespace as the application because resolver configuration may differ.
java
11 minJVM Memory Errors: Diagnose Heap Exhaustion, StackOverflow, and Leaks
Separate heap pressure from thread-stack failure, collect the right evidence, and fix the retention path rather than masking symptoms.
databases
9 minStored Functions, Procedures, and Triggers: Put Logic in the Right Layer
Compare database routines and triggers with application services, focusing on transaction ownership, portability, and operational visibility.