> ## 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.

# Enqueue (Lock) Waits, Oracle Database KPI card, Vortex IQ Nerve Centre

> Oracle-distinctive - 'enq: TX - row lock contention' / 'enq: TM' waits from V$SYSTEM_EVENT. Climbing = lock contention building.

**[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:** Supporting Metrics
* **Chart:** line
* **Format:** number
* **Time window:** RT/15m
* **Alert trigger:** sustained spike >baseline

## Calculation

Oracle-distinctive - 'enq: TX - row lock contention' / 'enq: TM' waits from V\$SYSTEM\_EVENT. Climbing = lock contention building.

## Known limitations

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