Reports query optimization using index hints #103
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VitaliStupin
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* MongoDB sometimes selects incorrect index for query * Hint helps to avoid unnecessarily slow queries
As X-Road usually has more service clients than producers, using client subsystem code based index returns fewer rows and performs better
Avoiding unnecessary DB requests to find the list of documents where client and service is the same subsystem. This info is computable from document data. Additionally, fixing invalid duplicate detection when client and producer requestInTs are in different report periods. "get_faulty_documents" did not find duplicates in that case.
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melbeltagy
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Jun 3, 2024
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MongoDB sometimes selects incorrect index during report preparation queries. This results in inconsistent performance when some of the queries are unnecessarily slow. Using index hints helps MongoDB to select appropriate indexes for the queries.
This problem became especially obvious after upgrade to MongoDB v7, but the problem existed before upgrade too.
Additionally removing unnecessary DB requests to find the list of documents where client and service is the same subsystem.