---
name: watsonxdata-api_custom_pcpp_vlx
title: Velox properties for Presto (C++)
description: You can customize the Velox properties through an API for Presto (C++).
last-updated: 2024-10-10
---

> ## Documentation Index
> The table of contents for this documentation set is at https://cloud.ibm.com/docs/watsonxdata?format=markdown
> The index for all IBM Cloud docs is at: https://cloud.ibm.com/docs/llms.txt
> Use these files to discover more information as needed.

# Velox properties for Presto (C++)
{: #api_custom_pcpp_vlx}

You can customize the Velox properties through an API for Presto (C++).

| Property name | Type | Validation added |
| --- | --- | --- |
| `task_writer_count` | Integer | Limit {1, 1000} |
| `max_split_preload_per_driver` | Integer | Limit {1, 1000} |
{: caption="Velox properties for Presto (C++)" caption-side="bottom"}