2. Agenda
• ¿Por qué es importante el rendimiento?
• Desafíos comunes de rendimiento
• Analizando problemas de rendimiento
• Tácticas para Mejorar el Rendimiento
6. Región Average Round-Trip Time (ms) Average Packet Loss (%)
Africa 469 3.70
Australia 204 0.23
Balkans 202 0.74
Central Asia 597 1.24
East Asia 192 0.68
Europa 178 0.48
Latin America 270 1.15
Middle East 279 0.87
North America 59 0.09
Russia 243 2.48
South Asia 424 1.89
South East Asia 254 0.03
19. SELECT P.FirstName, P.LastName,
SC.AccountNumber, SC.ModifiedDate
FROM Sales.Customer AS SC
JOIN Person.Person P
ON SC.PersonID =
P.BusinessEntityID
WHERE P.LastName in ('Adams')
ORDER BY P.LastName, P.FirstName ;
20. Query 1 Se compila y se almacena en el cache
Select * from Person.Address where AddressID in
(1, 2)
Query 2 Se compila y se almacena en el cache
Select * from Person.Address where AddressID in
(2, 1)
Query 3 Se reutiliza
Select * from Person.Address where AddressID in
(1, 2)
21.
22. SELECT qs.sql_handle, qs.statement_start_offset,
qs.statement_end_offset
, qs.creation_time, qs.last_execution_time,
SUBSTRING(qt.text,qs.statement_start_offset/2+1,
(CASE WHEN qs.statement_end_offset = -1
THEN LEN(CONVERT(nvarchar(max), qt.text)) * 2
ELSE qs.statement_end_offset end -
qs.statement_start_offset
)/2
) AS query_text
FROM sys.dm_exec_query_stats qs
CROSS APPLY sys.dm_exec_sql_text(qs.sql_handle) qt