Entendendo o que sp_updatestats realmente atualiza

• O tamanho da tabela passou de 0 para>0 linhas (teste 1).
• O número de linhas na tabela quando as estatísticas foram coletadas era 500 ou menos, e o colmodctr da coluna principal do objeto de estatísticas mudou em mais de 500 desde então (teste 2).
• A tabela tinha mais de 500 linhas quando as estatísticas foram coletadas e o colmodctr da coluna principal do objeto de estatísticas mudou em mais de 500 + 20% do número de linhas na tabela quando as estatísticas foram coletadas ( teste 3).

USE [AdventureWorks2012];
GO
SET NOCOUNT ON;
GO
 
UPDATE [Production].[Product]
SET [Name] = 'Bike Chain'
WHERE [ProductID] = 952;
 
UPDATE [Person].[Person]
SET [LastName] = 'Cameron'
WHERE [LastName] = 'Diaz';
GO
 
INSERT INTO Sales.SalesReason
(Name, ReasonType, ModifiedDate)
VALUES('Stats', 'Test', GETDATE());
GO 10000

declare ms_crs_tnames cursor local fast_forward read_only for
select name, object_id, schema_id, type from sys.objects o
where o.type = 'U' or o.type = 'IT'
open ms_crs_tnames
fetch next from ms_crs_tnames into @table_name, @table_id, @sch_id, @table_type

set @index_names = cursor local fast_forward read_only for
select name, indid, rowmodctr
from sys.sysindexes
where id = @table_id
and indid > 0
and indexproperty(id, name, 'ishypothetical') = 0
order by indid

if ((@ind_rowmodctr <> 0) or ((@is_ver_current is not null) and (@is_ver_current = 0)))

SELECT [o].[name], [si].[indid], [si].[name], [si].[rowmodctr], [si].[rowcnt], [o].[type]
FROM [sys].[objects] [o]
JOIN [sys].[sysindexes] [si] ON [o].[object_id] = [si].[id]
WHERE ([o].[type] = 'U' OR [o].[type] = 'IT')
AND [si].[indid] > 0
AND [si].[rowmodctr] <> 0
ORDER BY [o].[type] DESC, [o].[name];

SELECT [sch].[name] + '.' + [so].[name] AS [TableName] ,
[ss].[name] AS [Statistic],
[sp].[last_updated] AS [StatsLastUpdated] ,
[sp].[rows] AS [RowsInTable] ,
[sp].[rows_sampled] AS [RowsSampled] ,
[sp].[modification_counter] AS [RowModifications]
FROM [sys].[stats] [ss]
JOIN [sys].[objects] [so] ON [ss].[object_id] = [so].[object_id]
JOIN [sys].[schemas] [sch] ON [so].[schema_id] = [sch].[schema_id]
OUTER APPLY [sys].[dm_db_stats_properties]([so].[object_id],
[ss].[stats_id]) sp
WHERE [so].[type] = 'U'
AND [sp].[modification_counter] > 0
ORDER BY [sp].[last_updated] DESC;