> ## 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.

# Blocking Lock Chain >30s, Oracle Database KPI card, Vortex IQ Nerve Centre

> V$SESSION.BLOCKING_SESSION chain sustained - row-lock contention stalling 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:** Nerve Centre
* **Type:** Key Metrics
* **Chart:** alert\_list
* **Format:** number
* **Time window:** RT
* **Alert trigger:** any session blocked >30s

## Calculation

V\$SESSION.BLOCKING\_SESSION chain sustained - row-lock contention stalling the app.

## Known limitations

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