Query Performance Degradation in Azure West Europe

We are currently investigating an issue affecting query performance in Azure West Europe.

We are continuing to investigate this issue and will provide further updates as soon as available.

The issue has been identified and a fix is being implemented.

We are continuing to work on a fix for this issue.

We are continuing work to remediate immediate query performance degradation, and investigating actions for a permanent fix.

Query performance has returned to normal levels. Planned stabilisation work is still ongoing, and we are monitoring closely.

Query performance remains stable, and we continue to monitor closely. Additional mitigation and stabilization work is ongoing.

Query performance remains stable, and we continue to monitor closely as traffic increases. We will continue to assess performance and provide updates.

We are working on resolving the ongoing intermittent query performance.

During peak usage periods, large or complex queries may run slower than normal.

Writes and data durability are not affected at this time.

We have deployed several improvements overnight and further changes are in progress.

We have identified the issue and the team is actively working on implementing a fix.

We are still having issues in the region, the engineering team is working on it.

We are continuing to investigate this issue.

We are continuing to investigate this issue.

We have made several recent changes to improve query performance and we continue to monitor the region closely.

Performance has returned to normal levels following an update. We will continue to monitor.

We have increased isolation in the storage layer for the impacted region to provide greater amounts of resilience and to allow for faster recovery. We are continuing to investigate heightened memory consumption and page faults within the storage layer. Query success rates and response durations have returned to normal levels. We will continue work to increase the resiliency of this region over the next 24 hours and will carefully monitor for any increase in query latency.

The cluster remains stable, and we are continuing to monitor it.

We appreciate the continued patience while we worked through this incident.

We have been monitoring the previous fixes for the last 24 hours and all changes have responded well during sustained traffic. The region is stable and we are resolving this incident. An RCA is in progress and will be added to our status page as soon as its available.