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Elasticsearch offers two pagination methods: from & size for shallow pages and search_after for deep pages.

Filters check conditions without affecting relevance, while queries do.

Search engines collect, index, retrieve, and rank documents to provide relevant results.

Choose Elasticsearch for complex text searches, but use databases for structured queries.

Database bottlenecks slow down performance, but identifying them helps optimize and scale effectively.

B-Trees help databases find data quickly without scanning every row.

An inverted index helps search engines quickly find documents containing specific terms.

Elasticsearch distributes search queries across shards to find and retrieve results quickly.

The Cache-Aside Pattern speeds up data retrieval by using a cache to store frequently accessed data.

Cache breakdowns can overwhelm databases, but request coalescing solves this issue.

The choice between SQL and NoSQL databases depends on your application's specific needs.

Cache penetration occurs when requests for non-existent data overload the database.

You can update Elasticsearch indices without downtime using alias switching.

Elasticsearch fuzzy search allows finding results even with typos in queries.

Elasticsearch aliases allow zero-downtime switching between indices for applications.