SQL Server 2014 New Features (Sql Server 2014 Yenilikleri)

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ismailadar@hotmail.com

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İsmail
Adar

@ismailadars

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

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.

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

How Buffer Pool Extension works
Buffer Pool
Clean Page

Dirty Page

SSD
ɸ

Evict
Clean Page

DB

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

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

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)

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 ])
] [;]

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 }

DMV- sys.dm_exec_query_profiles

DEMO
DMV- sys.dm_exec_query_profiles

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

–

•



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
–

•

Limitations and workarounds
–

http://msdn.microsoft.com/en-us/library/dn247639(v=sql.120).aspx

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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
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SQL Server 2014 New Features (Sql Server 2014 Yenilikleri)

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