Table Fast Row Count

 sys.dm_db_partition_stats (Transact-SQL) - SQL Server | Microsoft Learn

SELECT

    OBJECT_NAME(object_id) AS TableName,

    SUM(row_count) AS RowCount

FROM sys.dm_db_partition_stats

WHERE index_id IN (0,1)

GROUP BY object_id

ORDER BY RowCount DESC;

If sys.dm_db_partition_stats (or sys.partitions) is giving inaccurate row counts, it’s usually not a bug—it’s due to how SQL Server maintains metadata. Here’s what’s happening and how to deal with it:

Metadata Lag

• Row counts come from internal allocation metadata, not real-time scans.
• Updates happen during:
  • checkpoints
  • index rebuild/reorg
  • statistics updates

👉 Under heavy INSERT/DELETE, the count can drift.

⚠️ Common Causes of Wrong Counts

Cause	Effect
Heavy DML (INSERT/DELETE)	DMV lag
Truncated tables	mismatch temporarily
Bulk operations	metadata delay
Disabled/rebuilt indexes	stale counts
Partition switching	incorrect totals
Heaps with forwarding records	inaccuracies

✅ How to Fix / Improve Accuracy

DBCC UPDATEUSAGE (YourDatabaseName) WITH COUNT_ROWS;

DBCC UPDATEUSAGE (Transact-SQL) - SQL Server | Microsoft Learn