Post on 27-Nov-2014
description
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!