> ## Documentation Index
> Fetch the complete documentation index at: https://docs.vortexiq.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Query Error Rate %, Microsoft SQL Server KPI card, Vortex IQ Nerve Centre

> Errors/sec counter (sys.dm_os_performance_counters) over batch requests. Spikes flag failing queries / app retry storms.

**[Nerve Centre KPIs](/nerve-centre/kpi-cards/mssql) · [Audit Profile](/nerve-centre/kpi-cards/mssql/audit) · [Sentiment Settings](/nerve-centre/kpi-cards/mssql/sentiment)**

## At a glance

* **Category:** Errors
* **Type:** Key Metrics
* **Chart:** gauge
* **Format:** percent
* **Time window:** 5m
* **Alert trigger:** >1%

## Calculation

Errors/sec counter (sys.dm\_os\_performance\_counters) over batch requests. Spikes flag failing queries / app retry storms.

## Known limitations

*Known limitations, FAQs, or reconciliation notes specific to this card. Replace this block when authored.*