# Delayed Start Compute Operations - Triggering Event

DevFeed: [Delayed Start Compute Operations - Triggering Event](<https://devfeed.tech/articles/delayed-start-compute-operations-triggering-event-5183.md>)

Original publisher: [Read original article](<https://neon.com/blog/delayed-start-compute-operations-triggering-event>)

Author: Mihai Bojin

Published: 2025-05-30T20:24:56Z

Content type: article

Language: en

Sources: [Blog -- Neon Docs](<https://devfeed.tech/sources/blog-neon-docs.md>)

Topics: [Post Mortem](<https://devfeed.tech/topics/post-mortem.md>), [Databases](<https://devfeed.tech/topics/databases.md>), [SQL](<https://devfeed.tech/topics/sql.md>), [Serverless](<https://devfeed.tech/topics/serverless.md>), [Structured-data](<https://devfeed.tech/topics/structured-data.md>)

Tags: [2025](<https://devfeed.tech/tags/2025.md>), [database](<https://devfeed.tech/tags/database.md>), [engineering](<https://devfeed.tech/tags/engineering.md>), [golang](<https://devfeed.tech/tags/golang.md>), [ip](<https://devfeed.tech/tags/ip.md>), [monitor](<https://devfeed.tech/tags/monitor.md>), [outage](<https://devfeed.tech/tags/outage.md>), [performance](<https://devfeed.tech/tags/performance.md>), [post-mortem](<https://devfeed.tech/tags/post-mortem.md>), [postgres](<https://devfeed.tech/tags/postgres.md>), [scale](<https://devfeed.tech/tags/scale.md>), [serverless](<https://devfeed.tech/tags/serverless.md>), [serverless-architecture](<https://devfeed.tech/tags/serverless-architecture.md>), [sql](<https://devfeed.tech/tags/sql.md>)

## AI overview

This post-mortem summary explains how a Postgres query plan change in Neon's Activity Monitor caused database CPU saturation. The resulting slowdown prevented the control plane from suspending idle Compute VMs, increasing concurrent VMs and ultimately causing IP exhaustion during the 2025-05-16 outage.

## Source excerpt

For further details, read the top-level Post-Mortem. Summary The Neon Control Plane service is backed by a Postgres database. A scheduled job in the Control plane, Activity Monitor, is responsible for identifying Computes that are ready to be suspended. A Postgres query executed...