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habr.com /1 month ago

Индекс как алфавитный указатель: как база ищет и почему иногда не находит

В первой статье я объяснял кэш через холодильник. Продолжу тем же способом. Сейчас будет про индексы, а потом про то, почему индекс есть, а база его игнорирует.Статья для тех, кто...

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ninjaone.com /1 week ago

What Index Selectivity Means for Query Performance

Indexes are reliable tools that help improve query performance, but they aren’t always optimized well enough for a specific query to deliver the desired results. Index selectivity...

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dzone.com /2 weeks ago

Apache Phoenix: Global Secondary Indexes With Tunable Consistency

Apache Phoenix provides an open-source SQL interface over Apache HBase, combining the power of NoSQL horizontal scaling and sharding with SQL simplicity for low-latency and high-th...

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habr.com /1 month ago

Как ускорить выборку из больших таблиц PostgreSQL без ручного создания индексов: разбираем iHeap

Что, если индекс не нужно создавать вообще? Знакомимся с iHeap — альтернативным методом доступа к таблицам PostgreSQL, где BRIN-индексирование встроено «из коробки» и работает авто...

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brentozar.com /1 month ago

Database Animations: What’s a Residual Predicate and Why Is It Bad?

Normally when you’re looking at an execution plan, and you see an index seek followed by a key lookup, that means it’s running relatively quickly. To explain, let’s take the Users...

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dev.to /1 month ago

Ten Million Keys, One Missing Index

Open original cover image This article explores how a per-entity index improves Redis cache invalidation by replacing repeated full-keyspace scans with targeted lookups. All perf...

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dzone.com /1 month ago

Memory-First Indexes in SQL Server 2025: Redefining Performance for Hybrid Workloads

Modern database environments rarely run a single type of workload. Most production systems handle both transactional operations and analytical queries simultaneously. These mixed w...

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