# Update-HNSW-parameters-for-enhanced-Aviator-semantic-search-accuracy_686074753
## Introduction

This topic describes how to update the HNSW parameters to improve the semantic search accuracy on the PM tenant.

## Update the HNSW parameters

This task is per tenant.

1. Log in to **https://<Milvus\_attu\_host>/?#/connect**.
2. From the navigation pane on the left, select **Collection**.
3. Hover over the required collection and click the highlighted **release** button that appears at the end of this row.
4. Release the specified Vector DB collection. The collection status will change to **Unloaded**.
	The Aviator capability will be unavailable until you complete all the steps in this task. During this period, the incoming index data will not be stored in this collection.
5. Click the released collectionn name.
6. On the **Schema** tab, click the remove button of the **Vector** field, and then type **drop** to confirm.
7. Click **+INDEX** of the Vector field.
8. On the dialog box that appears, enter a descriptive name and then set **Index Type** to **HNSW**, **Metric Type** to **L2**, **M** to **64**, and **Ef Construction** to **512**. Click **Create**.
9. Go back to the collection list, hover over the collection, and click the **load** button that appears at the end.
10. Load the specified Vector DB collection. The collection status will change to **Loaded**.
