The document summarizes several topics discussed by Ismail Adar including buffer pool extension, resource governor for I/O, delayed durability, DMV sys.dm_exec_query_profiles, and selecting into parallel. Buffer pool extension allows using SSD storage to increase the amount of memory available for the buffer pool. Resource governor for I/O provides I/O level isolation between workloads. Delayed durability controls the durability of transactions. The DMV sys.dm_exec_query_profiles profiles query execution. Selecting into allows inserting results of a query in parallel into a table.

1. İsmail Adar

2. About.Me()
• Veritabanı Takım Lideri / Doğan Online
• Eğitimen/Danışmanı / Btakademi
• Kitap Yazarı
• Microsoft Certified Trainer
ismailadar@hotmail.com
http://www.ismailadar.com
İsmail
Adar
@ismailadars

3. Content.GetAgenda()
• Buffer Pool Extension
• Resource Governor for I/O
• Delayed Durability
• DMV- sys.dm_exec_query_profiles
• Select into Parallel

5. Buffer Pool Extension Requirement
• Increasing memory available to SQL Server is the easiest
way of improving OLTP performance.
• However, adding more memory might be expensive or even
unsupported, especially on the old machines with limitations
on DIMM sizes and/or number of supported memory slots.
• Adding new storage devices to the same machines is usually
supported.

6. Buffer Pool Extension
• Buffer pool is
– The most widely used part of the SQL Server memory
management
– The biggest memory block, most benefits from the memory
increases
– The most critical memory pool for reducing the IO pressure for
OLTP
• SQL Server Buffer Pool Extension can use nonvolatile
storage devices for increasing amount of memory available
for buffer pool consumers. This allows usage of SSD as an
intermediate buffer pool pages thus getting price advantage

7. How Buffer Pool Extension works
Buffer Pool
Clean Page
Dirty Page
SSD
ɸ
Evict
Clean Page
DB

8. Buffer Pool Extension Configuration
ALTER SERVER CONFIGURATION
SET BUFFER POOL EXTENSION
{ ON ( FILENAME = 'os_file_path_and_name' ,
SIZE = <size> [ KB | MB | GB ] )
| OFF }
Privilege required: ALTER SERVER STATE

9. Buffer Pool Extension
Buffer Pool Extension for SSD Disks
Only Clean Pages
Esay Configuration
New DMV
SELECT * FROM sys.dm_os_buffer_pool_extension_configuration
SELECT * FROM sys.dm_os_buffer_descriptors

10. DEMO
Buffer Pool Extension

12. Why Govern IO?
• Providing IO level isolation between multiple workloads is a
single biggest pain point for customers (especially hosters)
using SQL Server Resource Governor to implement a private
cloud or a Database as a Service
• IO level performance predictability in combination with CPU
and Memory governance (which are shipped already) makes
a comprehensive Resource Governance solution for mission
critical applications running multiple workloads on a single
SQL instance (typically on high-end scale up machines or
large VMs)

13. Configure Resource Governor for I/O
Ability to set/get/alter Maximum and minimum IOPS per volume to Resource Governor Resource Pools
CREATE/ALTER RESOURCE POOL pool_name
[ WITH
( [ MIN_CPU_PERCENT = value ]
[ [ , ] MAX_CPU_PERCENT = value ]
[ [ , ] CAP_CPU_PERCENT = value ]
[ [ , ] AFFINITY {SCHEDULER = AUTO | (Scheduler_range_spec) | NUMANODE = (NUMA_node_range_spec)}
]
[ [ , ] MIN_MEMORY_PERCENT = value ]
[ [ , ] MAX_MEMORY_PERCENT = value ]
[ [ , ] MIN_IOPS_PER_VOLUME = value ]
[ [ , ] MAX_IOPS_PER_VOLUME = value ])
] [;]

15. Delayed Durability
ACID Rules
Log Buffer
sp_flush_log is executed
The in-memory transaction log buffer fills up.
A fully durable transaction in the same database makes a change
in the database and commits
ALTER DATABASE … SET DELAYED_DURABILITY = { DISABLED |
ALLOWED | FORCED }

16. DEMO
Delayed Durability

18. DMV- sys.dm_exec_query_profiles

19. DEMO
DMV- sys.dm_exec_query_profiles

21. DEMO
Select into Parallel

22. Resources
•
Overview of all In-Memory OLTP posts on the SQL Server blog
–
http://blogs.technet.com/b/dataplatforminsider/archive/2013/10/15/the-411-on-the-microsoft-sql-server-2014-in-memory-oltp-blog-series.aspx
•
SQL 2014 CTP2
–
http://technet.microsoft.com/en-US/evalcenter/dn205290?WT.mc_id=Blog_SQL_InMem_CTP2
•
Getting started with In-Memory OLTP
–
http://blogs.technet.com/b/dataplatforminsider/archive/2013/06/26/getting-started-with-sql-server-2014-in-memory-oltp.aspx
•
In-Memory OLTP Sample, based on AdventureWorks
–
https://msftdbprodsamples.codeplex.com/releases/view/114491?WT.mc_id=Blog_SQL_InMem_CTP2
•
Analysis and Migration tools
–
–
http://technet.microsoft.com/en-us/library/dn284308(v=sql.120).aspx
–
•
http://technet.microsoft.com/en-us/library/dn205133(v=sql.120).aspx
http://technet.microsoft.com/en-us/library/dn358355(v=sql.120).aspx
Transaction isolation with In-Memory OLTP
–
Choosing isolation level: http://msdn.microsoft.com/en-us/library/dn133187(v=sql.120).aspx
–
Implement retry logic: http://msdn.microsoft.com/en-us/library/dn169141(v=sql.120).aspx
•
Books Online documentation for In-Memory OLTP
–
http://technet.microsoft.com/en-us/library/dn133186(v=sql.120).aspx
•
Limitations and workarounds
–
http://msdn.microsoft.com/en-us/library/dn247639(v=sql.120).aspx

23. ©2013 Microsoft Corporation. All rights reserved. Microsoft, Windows, Office, Azure, System Center, Dynamics and other product names are or may be registered trademarks and/or trademarks in the
U.S. and/or other countries. The information herein is for informational purposes only and represents the current view of Microsoft Corporation as of the date of this presentation. Because Microsoft
must respond to changing market conditions, it should not be interpreted to be a commitment on the part of Microsoft, and Microsoft cannot guarantee the accuracy of any information provided after
the date of this presentation. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.