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Forcing a SELECT Query to Use a Specific Index in AX / D365FO with Index Hints

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Dynamics 365 ERP - Development

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Nov 8, 2024

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  • In Dynamics AX and Dynamics 365 Finance and Operations (D365FO), index hints can be used to force a query to use a specific index for optimal performance.
  • The allowIndexHint() method and index hint clause in D365FO can guide the database on which index to use for a query.
  • Enabling index hints is done by calling allowIndexHint(true) and specifying the desired index in the SELECT statement.
  • Index hints should be used for performance optimization, query troubleshooting, and gaining control over query execution plans.
  • Before using index hints, it is important to understand the available indexes on the table and the data distribution.
  • Testing the performance impact of index hints in a non-production environment is crucial before implementing them.
  • Maintenance and schema changes can affect the effectiveness of index hints, so caution should be taken when specifying index names.
  • Using index hints in D365FO can significantly improve query performance when applied properly and with a deep understanding of the data structure and indexes.

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