In Amazon DocumentDB ,for fields that have an array value, a multi-key in for fields that have an array value, a multi-key index allows you to create an index key for each element in the array. The array can be scalar (strings or numbers) and nested documents. When using multiple $elemMatch along with $and operator on indexed arrays containing nested objects as elements , Amazon DocumentDB query optimizer can utilize multikey indexes more efficiently when we arrange the query conditions on multikey index columns in increasing order of number of documents they match. This enables the narrowing down of the search scope of the first pass of the query execution to a fewer number of documents, leading to faster execution times.
You can elevate performance for workloads that query arrays by tailoring queries to the cardinality of your data. This project aims to facilitate the replication of test setups for Amazon DocumentDB, demonstrating performance enhancements through optimal rewriting of array queries. With insights into your dataset, crafting array queries tailored to DocumentDB's cloud native engine can significantly optimize execution.
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