find and fix sql server performance problems faster

THERE’S YOUR PROBLEMTROUBLE S HOOTING SQL SERVER LIKE A PRO

Joey D’Antoni20 August 2015

THERE’S YOUR PROBLEM

2© 2015 SOLARWINDS WORLDWIDE, LLC. ALL RIGHTS RESERVED.

AGENDA

Performance

Wait Stats

Indexes, When and Where

Perfmon

Bringing This All Together

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M A K I N G T H I N G S FA S T E R

© 2015 SOLARWINDS WORLDWIDE, LLC. ALL RIGHTS RESERVED.

FIRST THINGS FIRST

Dynamic Management Views are Your Friends

SSMS GUI offers some insight, but not nearly as much as queries and scripts

Consider using tools at scale

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G E T C O M F O R TA B L E W I T H D M V S


PERFORMANCE TUNING SQL SERVER

DBAs get paid to backup and

restore databases

Performance usually gets

second priority due to uptime

Let’s about some

techniques to cut to the chase

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L I K E A P R O


HOW I TUNE A SERVER

Check Server Configuration

Read Error Log

Look at Wait Stats

Look in Plan Cache

Tune Queries

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M Y M E T H O D O L O G Y


PERFORMANCE BOTTLENECKS

CPU

Disk

Memory

Network

Blocking/Locking

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I S TO L E T H I S F R O M TO M


UNDERSTANDING WAIT STATS

Whenever SQL Server is waiting on something it records it

Knowing how to read wait stats is the key to understanding performance

Paul Randal—Tell me where it hurts

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T H E S E C R E T S TO S Q L P E R F O R M A N C E


WAIT STATS DEMO

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L E T M E S E E H O W I T W O R K S


CXPACKET

Check MaxDOP

Understand Cost

Threshold for Parallelism

Understand your

workload

Dig into the plan cache

It may be natural

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W H Y A M I A LWAY S S E E I N G T H I S


INDEXES


TOOLS OF THE TRADE

SET STATISTICS IO ON

SET STATISTICS TIME ON

WAIT STATS

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Q U E RY T U N I N G

WAIT STATS AND MISSING INDEXES

Large Logical Reads

PAGEIOLATCH_SH

Storage Latency

Can result in higher than usual CPU use

SP_WHOISACTIVE--Adam Machanic

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OTHER PERFORMANCE TRICKS

Data Compression where appropriate

Columnstore for analytical workloads

Splitting workloads by disk device using filegroups

Faster SAN/More RAM

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M A K I N G D ATA G O FA S T E R


DATA COMPRESSION

Reduces IOs needed

Incurs a CPU cost

Good for slower storage

Good for workloads with high scan rate

Impact is mainly on update


DATABASE TUNING ADVISOR

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B E V E RY C A R E F U L


IDENTIFYING WHICH QUERIES TO TUNE

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D I G G I N G I N D E E P


Physical Query Tuning

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D E M O


Execution Plans

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C A P T U R I N G A N D U N D E R S TA N D I N G E X E C U T I O N

P L A N S


POLL

Do You Know xQuery?

Have you worked with xEvents?


CAPTURING EXECUTION PLANS

Profiler is marked as deprecated

Extended Events ARE the path forward

Profiler is still a lot easier to use IMO

xEvents are more powerful

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P R O F I L E R V S X E V E N T S


QUERY STORE

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S Q L S E RV E R 2 0 1 6


WINDOWS PERFORMANCE MONITOR

Powerful Tool for holistic view of environment

Dedicated SQL Server counters

Can integrate with profiler traces

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A K A P E R F M O N


PERFMON COUNTERS

Memory

•Available Mbytes

SQL Server:Buffer Manager

•Lazy writes/sec

•Page life expectancy

•Page reads/sec

•Page writes/sec

SQL Server:Memory Manager

•Total Server Memory (KB)

•Target Server Memory (KB)

Processor

•%Processor Time

•%Privileged Time

Process (sqlservr.exe)

•%Processor Time

•%Privileged Time

Physical Disk

•Avg. Disk sec/Read

•Avg. Disk Bytes/Read

•Avg. Disk sec/Write

•Avg. Disk Bytes/Write

Paging File

•%Usage

SQL Server:Access Methods

•Forwarded Records/sec

•Full Scans/sec

• Index Searches/sec

System

•Processor Queue Length

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S Q L S E RV E R


PERFMON TIPS

Always run away of production server

Every 15 seconds is fine unless finding something specific

Use BLG files—can use relog to go to another format

Include Perfmon


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R E S O LV E P E R F O R M A N C E I S S U E S Q U I C K LY


www.solarwinds.com/dpa-download/

THANK YOU


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find and fix sql server performance problems faster

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