---
title: How can I adjust heap size (memory requirements) for my persistent queries?
---

See the [Monitor query performance](../../performance/monitor-queries.md) in the Troubleshooting Queries guide for a comprehensive overview of how to monitor and adjust heap size for your Persistent Queries.

The tables generated by the performance overview methods let you look at how much memory a query is using. If the query/worker is using only a small percentage of its max heap size, you should reclaim some of that memory for other queries. On the other hand, if a query is requiring almost all the memory allocated, you should increase the heap size to prevent underperformance or failure.

If you are investigating a specific query and have concerns about heap, we recommend turning on detailed GC logging in the **Persistent Query Editor**, under **Advanced Options** (enabled by default). You can also turn on detailed GC logging when you create a new console by selecting **Advanced Options** and selecting **Enable detailed GC logging**. This creates additional lines in the [Process Event Log](../../performance/monitor-queries.md#process-event-log), which can be used to analyze performance or failures.

## Related documentation

- [Create Persistent Queries](../../query-management/ui-queries.md#create-persistent-queries)
- [Monitor query performance](../../performance/monitor-queries.md)
- [Process Event Log](../../performance/monitor-queries.md#process-event-log)