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+
+slug: /vector-search-faq
+---
+
+# Vector search FAQs
+
+This topic describes some common issues that may occur when using vector search, as well as their causes and solutions.
+
+## Must all rows in a vector column have the same data dimensionality?
+
+Yes. A data dimensionality must be specified when a vector column is defined, and the dimensionality must be verified when vector data is written into the column.
+
+## What is the maximum number of rows of vector data that can be written?
+
+Unlimited. It depends on the database memory resources.
+
+## How do I create an index on a vector with more than 4096 dimensions?
+
+You need to compress the data to within 4096 dimensions before creating an index.