> ## Documentation Index
> Fetch the complete documentation index at: https://actianvectorai-docs-license-activation.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Update collection parameters

> Modify collection configuration after creation.

After creating a collection, you may need to adjust its configuration as requirements change. You can modify the following parameters after creation.

* `optimizers_config`: Controls indexing threshold and optimizer behavior.
* `hnsw_config`: Controls HNSW index parameters such as `m` and `ef_construct`.
* `wal_config`: Controls write-ahead log settings.

Vector dimension and distance metric cannot be changed after creation. To use different values, delete and recreate the collection.

The following example updates the indexing threshold so that VectorAI DB delays building the index until the collection reaches 50,000 points:

<CodeGroup>
  ```python Python theme={null}
  import asyncio
  from actian_vectorai import AsyncVectorAIClient, OptimizersConfigDiff

  async def main():
      # Connect to VectorAI DB server
      async with AsyncVectorAIClient("localhost:6574") as client:
          # Update collection configuration
          await client.collections.update(
              "my_collection",  # Collection name
              optimizers_config=OptimizersConfigDiff(
                  indexing_threshold=50000  # Points before indexing
              )
          )
          print("Collection parameters updated")

  asyncio.run(main())
  ```

  ```javascript JavaScript theme={null}
  import { VectorAIClient } from '@actian/vectorai-client';

  async function main() {
      // Connect to VectorAI DB server
      const client = new VectorAIClient('localhost:6574');
      try {
          // Update collection configuration
          await client.collections.update('my_collection', {
              hnswConfig: {
                  m: 32,
                  efConstruct: 200
              }
          });
          console.log('Collection parameters updated');
      } finally {
          client.close();
      }
  }

  main().catch(console.error);
  ```
</CodeGroup>

<Note>
  To use a different vector dimension or distance metric, you must delete and recreate the collection. See [Delete a collection](/docs/fundamentals/collections/delete-collection-task) for instructions.
</Note>