ob_hnsw_ef_search

Description

ob_hnsw_ef_search specifies the number of neighbor points that the HNSW algorithm searches for in each layer of the graph during vector index queries. A larger value means that the algorithm explores more neighbor points, increasing the chances of finding the true nearest neighbors and thus improving search accuracy. However, this also increases the search time.

Privilege requirements

• Query variables

  The sys tenant and all user tenants can use the SHOW VARIABLES statement or the information_schema.SESSION_VARIABLES view (MySQL mode) to view the values of session system variables.

• Modify variables

  The sys tenant and all MySQL user tenants can directly modify the values of session system variables for their own tenants.

Attributes

Examples

Set the number of neighbor points that the HNSW algorithm searches for in each layer of the graph during vector index queries to 50.

obclient> SET ob_hnsw_ef_search = 50;