Databases Intermediate

What is Elastic Search?

A distributed search and analytics engine built on Apache Lucene, optimized for full-text search and log analysis.

Elasticsearch indexes documents as JSON and provides powerful full-text search with relevance scoring. It supports fuzzy matching, aggregations, geospatial queries, and auto-completion. The ELK Stack (Elasticsearch, Logstash, Kibana) is the standard for log analysis.

Use cases include website search, application monitoring, security analytics, and business intelligence. Elasticsearch scales horizontally across clusters of nodes.

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Related Terms

A database that uses graph structures with nodes, edges, and properties to store and query highly connected data.

A category of databases that store data in non-tabular formats, optimized for specific data models and access patterns.

EXPLAIN ANALYZE

A PostgreSQL command that shows the execution plan of a query along with actual runtime statistics for performance tuning.

CTE (Common Table Expression)

A temporary named result set defined within a SQL statement using the WITH clause, improving query readability and enabling recursion.

A database command that shows how the query planner will execute a SQL query, revealing join methods, scan types, and estimated costs.

A middleware server that sits between applications and databases, providing connection pooling, load balancing, and query routing.

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