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Use VECTOR.COUNT to get the number of vectors currently stored in an index. Replacing the vector under an existing ID does not change the count, since the ID is what is counted. An index that does not exist counts as 0 rather than raising an error, so the command can be used as a cheap emptiness check without a prior EXISTS. Vector indexes are an Upstash extension. See the vector command overview for how an index is created, written to, and queried.

Syntax

Arguments

Important points

  • An index that does not exist replies 0. Use VECTOR.INFO, which replies null, to tell an empty index from a missing one.

Response

The reply reports the result of the operation. Error replies have the same shape in RESP2 and RESP3 and are surfaced as exceptions by the SDKs below.
Client libraries often decode bulk strings, maps, sets, and numeric strings into language-native values. The table describes the Redis wire reply.

Examples

TCP examples use the TLS REDIS_URL from the Upstash console. REST examples use UPSTASH_REDIS_REST_URL and UPSTASH_REDIS_REST_TOKEN.
This command is not supported yet in @upstash/redis.
This command is not supported yet in upstash_redis.