SQL Server 2012 New Performance

Tuning Tools

Who am I?

Menzo SteinhorstSenior Premier Field Engineer

SQLRAP,WS+ SQL Server Performance Tuning,WS+ SQL Server 2008 Admin,WS SSIS 2008 for DBA’sFocus area: Performance Tuning SQL Server

menzos@microsoft.com

Introduction

Agenda

New Tools and Features Overview

XEvents (Extended Events) Introduction Practical Uses

New Tools and Features

Performance Data Warehouse

Faster Spatial Performance

Paging for Result Sets

Partitioning

Faster Full Text Search

Column Store Index

Distributed Replay

XEvents

What is XEvents?

A general event-handling system

There since SQL Server 2008 Foundation of auditing Used for problem diagnosis and info gathering

Engine lives in sqlserver.exe Consumers can be in-proc or out of proc ETW consumer is provided

•Enables correlation between SQL Server and Windows trace information.•But....classic provider. Not very useful!

Extended Events in SQL Server 2012

SQL Trace (Profiler) is on the deprecated list! See Mike Wachal blog: “Migrating from SQL Trace to

Extended Events”Extended Events are supported in SSMS

Extended Events included in SMO Extended Events object model

Extended Events in PowerShell provider

SQL Server Diagnostics

SQL Server pre-2008 supports: Performance monitor counters

•Counters are cumulative•Little/no buil in filtering

SQL Profiler•Granular events•Column filters•Automated via server-side trace queues

SQL DMVs and DMFs•Detailed•No persisted info

Event Tracing for Windows (ETW)•Exposed profiler events

Demo XPerf

SQL Server 2012: Extended Events come of age!

Extended Events Less overhead than server-side trace queues

•Single event cost is ~2us on a 2GHz processor

Event and consumer agnostic•Any event can be processed by any consumer•New events can be added, immediatly useable

Allow actions to be taken when an event fires•Additional information can be included

Rich predicate system for filtering

Extended Events Explained

Event sessions specify Events

•The actual trigger•The payload of the event

Actions•The extra data that is collected

Targets•Where you send the data

Demo XEvent GUI in SQL 2012

XEvents Targets

Old Target Name New Target Name

asynchronous_file_target event_file

synchronous_event_counter event_counter

asynchronous_bucketizer histogram

synchronous_bucketizer

etw_classic_sync_target etw_classic_sync_target

pair_matching pair_matching

ring_buffer ring_buffer

event_stream

Demo Targets

XEvents Predicates

Filters are server-side

Occurences of events can be restricted pred_source object types

•counter and partitioned counter

Demo Predicates

Practical Uses: Troubleshooting Blocking

Demo

Practical Uses: Page Splits

Page Splits Explained

Practical Uses: Tracking Session and Statement Level Waits

2 Events: wait_info

•For SQLOS controlled resource

wait_info_external•Occurs when a SQLOS Task switches to preemptive mode.

Q & A

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