vitess

Vitess best practices, query optimization, and connection troubleshooting for PlanetScale Vitess databases. Load when working with Vitess databases, sharding, VSchema configuration, keyspace management, or MySQL scaling issues.

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Check one query for cross-shard costs

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Use the vitess skill to review one query against my sharded tables and VSchema. Explain whether its predicates support single-shard routing, flag cross-shard joins or aggregation costs, and suggest one small improvement based on the supplied query and routing configuration.

Required inputs

One SQL query and the relevant table definitions.
Relevant VSchema, vindex columns, and keyspace sharding configuration.

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