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Mango JSON selectors are convenient, but unindexed queries scan every document. Declare matching indexes, verify plans with _explain, and use MapReduce views when needed.
Learn how to replace slow ad‑hoc map/reduce queries with Mango JSON indexes in CouchDB 3.0+, see a concrete example of indexing the `type` field, and understand the trade‑offs involved.
CouchDB's Mango query API lets you skip map/reduce views for ad-hoc lookups — but only if you back selectors with JSON indexes, paginate with bookmarks, and know where Mango's limits are.
Mango Pagination and Bookmarking When using a Mango selector to retrieve a large collection, the limit and bookmark fields allow the client to iterate through results without using skip . The bookmark is a cursor that references a specific point in the index, enabling efficient forward paging. Uncertain Behavior on Index Rebuild In a dynamic database, indexe
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