Boris Hristov

SQL Server MVP, Speaker, Trainer, Blogger and DBA

Top 5 T-SQL Improvements

in SQL Server 2014

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That’s not a Hekaton Talk!

So who am I?

@BorisHristov

So who am I?

things that can make your life better

Here’s how this will go…

time

Delayed Durability

A Atomic

Isolated

Consistent

Durable

C

I

D

Data pages are located in,

or read into, the buffer cache

and then modified

2

Modification is recorded

in transaction log on disk3

Later, checkpoint writes

dirty pages to database4

Buffer Cache

Transaction’s lifecycle

Here’s the reason why it’s slow

Data pages are located in,

or read into, the buffer cache

and then modified

2

Modification is recorded

in transaction log on disk3

Later, checkpoint writes

dirty pages to database4

Buffer Cache

Transaction’s lifecycle

Yes,

you can lose data!

DEMODelayed Durability

SELECT INTO

Prior SQL Server 2014:

Serial Execution Plans

SQL Server 2014:

Parallel Execution Plans

Why don’t we speed up a bit?

Talk with the DBAs

to design a proper

disk and data layout!

You want that speed, right?

DEMOSELECT INTO

Cardinality Estimator

Why is the CE so important?Why is the CE so important?

The CE

has not been

changed since

SQL Server 7.0

…and at the same time

Queries with Multiple

Predicates

Queries Joining Multiple

Tables

New Data Not Presented

in the Stats

Almost everywhere…

(this, oh btw, means you have

to test a lot!)

Where to expect changes?

DEMOCardinality Estimator

Inline Index Definitions(remember this one for later)

SQL Server 2012

SQL Server 2014

Remember this improvement

DEMOInline Index Definitions

Partitioning Improvements

Numbers

0

…

8000

Partition 2

2501

…

4000

Partition 3

4001

…

8000

Why is partitioning both cool and not?

Partition 1

0

…

2500

DEMOPartitioning Improvements

Temporary Objects Caching

In summary

Delayed Durability

Parallel SELECT INTO

Cardinality Estimator

Inline Index Creation

Partitioning Improvements

Testing is

important!

Resources you can use

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Thank you!

Thank you!

@BorisHristov

brshristov@live.com

www.borishristov.com