> ## 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.

# AG Secondary Lag (seconds), Microsoft SQL Server KPI card, Vortex IQ Nerve Centre

> Always On AG only - estimated from redo_queue_size / redo_rate or last_commit_time delta in sys.dm_hadr_database_replica_states. Gated when no AG is configured.

**[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:** Replication
* **Type:** Key Metrics
* **Chart:** kpi
* **Format:** number
* **Time window:** RT
* **Alert trigger:** >10s

## Calculation

Always On AG only - estimated from redo\_queue\_size / redo\_rate or last\_commit\_time delta in sys.dm\_hadr\_database\_replica\_states. Gated when no AG is configured.

## Known limitations

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