> ## 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.

# Blocked Sessions, Oracle Database KPI card, Vortex IQ Nerve Centre

> V$SESSION WHERE BLOCKING_SESSION IS NOT NULL (corroborated by V$LOCK / DBA_BLOCKERS). Long blocker chains stall the app.

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

## At a glance

* **Category:** Concurrency
* **Type:** Key Metrics
* **Chart:** kpi
* **Format:** number
* **Time window:** RT
* **Alert trigger:** >0 blocked >30s

## Calculation

V$SESSION WHERE BLOCKING_SESSION IS NOT NULL (corroborated by V$LOCK / DBA\_BLOCKERS). Long blocker chains stall the app.

## Known limitations

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