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When the ScaNN index creation updates the reltuples statistics of a heap table, performance might be degraded for queries involving that table

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## Issue When the ScaNN index creation updates the `reltuples` statistics of a heap table, performance might be degraded for queries involving that table. For information to mitigate the issue, see "Analyze your indexed table" in the documentation for [AlloyDB for PostgreSQL](https://cloud.google.com/alloydb/docs/ai/store-index-query-vectors?resource=scann) and [AlloyDB Omni](https://cloud.google.com/alloydb/omni/current/docs/ai/store-index-query-vectors?resource=scann#analyze-indexed-table).