Boris HristovSQL Server MVP, Speaker, Trainer, Blogger and DBA

Top 5 T-SQL Improvements in SQL Server 2014

That’s not a Hekaton Talk!

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@BorisHristov

So who am I?

5things that can make your life better

Here’s how this will go…

time

We’re here

1Delayed Durability

A C

I D

Atomic

Isolated

Consistent

Durable

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 database

4

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 database

4

Buffer Cache

Transaction’s lifecycle

Yes, you can lose data!

DEMODelayed Durability

2SELECT 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

3Cardinality 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

4Inline Index Definitions

(remember this one for later)

SQL Server 2012

SQL Server 2014

Remember this improvement

DEMOInline Index Definitions

5Partitioning 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

+1Temporary Objects Caching

In summary

Delayed Durability

Parallel SELECT INTO

Cardinality Estimator

Inline Index Creation

Partitioning Improvements

Testing is important!

Resources you can use

Just a click away!

Thank you!