The 5 Hidden Performance Gems of SQL Server 2014 Boris Hristov SQL Server MVP, Speaker, Trainer, Blogger and DBA

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So who am I? So who am I? @BorisHristov

things that can make your life better 5 things that can make your life better

Here’s how this will go… We’re here time

1 Delayed Durability

A Atomic C Consistent I Isolated D Durable

Transaction’s lifecycle Buffer Cache Modification is recorded in transaction log on disk 3 Data pages are located in, or read into, the buffer cache and then modified 2 Later, checkpoint writes dirty pages to database 4

Here’s the reason why it’s slow

Transaction’s lifecycle Buffer Cache Modification is recorded in transaction log on disk 3 Data pages are located in, or read into, the buffer cache and then modified 2 Wouldn’t it be interesting if… 60 KB buffer -> flush Sp_flush_log Durable transaction – MSDTC or Cross database Later, checkpoint writes dirty pages to database 4

Yes, you can lose data!

DEMO Delayed Durability

2 SELECT INTO

Why don’t we speed up a bit? Prior SQL Server 2014: Serial Execution Plans SQL Server 2014: Parallel Execution Plans

You want that speed, right? Talk with the DBAs to design a proper disk and data layout!

DEMO SELECT INTO

Cardinality Estimator 3 Cardinality Estimator

Why is the CE so important?

The CE has not been changed since SQL Server 7.0 …and at the same time The CE has not been changed since SQL Server 7.0

Where to expect changes? 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!)

Cardinality Estimator DEMO Cardinality Estimator

Inline Index Definitions (remember this one for later) 4 Inline Index Definitions (remember this one for later)

Remember this improvement SQL Server 2012 SQL Server 2014

Inline Index Definitions DEMO Inline Index Definitions

Partitioning Improvements 5 Partitioning Improvements

Why is partitioning both cool and not? Numbers … 8000 Partition 1 … 2500 Partition 2 2501 … 4000 Partition 3 4001 … 8000

Partitioning Improvements DEMO Partitioning Improvements

Temporary Objects Caching +1 Temporary Objects Caching http://www.sqlpassion.at/archive/2013/06/27/improved-temp-table-caching-in-sql-server-2014/

In summary Testing is important! Delayed Durability Parallel SELECT INTO Cardinality Estimator Inline Index Creation Partitioning Improvements Testing is important!

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Thank you! Contacts: brshristov@live.com @BorisHristov www.borishristov.com