> ## 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.

# Top Wait Events (by wait class), Oracle Database KPI card, Vortex IQ Nerve Centre

> Oracle-distinctive - V$SYSTEM_EVENT / V$ACTIVE_SESSION_HISTORY grouped by WAIT_CLASS. 'db file sequential read', 'log file sync', 'enq: TX' climbing = bottleneck.

**[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:** Performance
* **Type:** Key Metrics
* **Chart:** bar\_horizontal
* **Format:** number
* **Time window:** RT/1h

## Calculation

Oracle-distinctive - V$SYSTEM_EVENT / V$ACTIVE\_SESSION\_HISTORY grouped by WAIT\_CLASS. 'db file sequential read', 'log file sync', 'enq: TX' climbing = bottleneck.

## Known limitations

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