PLSSUG - Troubleshoot SQL Server performance problems like a Microsoft Engineer

Polish SQL Server User Group
Troubleshoot SQL Server performance
problems like a Microsoft Engineer

About the Author
Marek Maśko
• Senior Database Analyst in
• Working with SQL Server for ~6 years
• SQL DBA, Dev & Architect
• Contact Information:
Email: marek.masko@gmail.com
LinkedIn: https://pl.linkedin.com/in/marekmasko
Twitter: @MarekMasko

Scenario
• Users report performance issue
• You know nothing about server and database
What you do?

Microsoft Customer Support Service
• Users report performance issue
• You open the MS Support Case
• MS CSS gives you PSSdiag package and ask you to run it
• You run it and collect the data
• Than You upload collected data to the workspace
• MS CSS returns with:
– huge report about your SQL Server state
– issue root cause explanation
– Solution or recommendation
How they do it?

Tools
Data collection
• PSSDiag / SQLDiag
• Diag Manager
Data analysis
• SQLNexus
– RML Utilities
– Relog
• PAL Tool

PSSDIAG

PSSdiag
• Developed as a side project at Microsoft
• Mainly used by CSS and PSS teams
• Tool wrapper on other MS tools
• Based on SQLDiag
• Two versions:
– Internal
– External
• Dramaticaly simplifies performance data collection

SQLDiag
• It’s a command line utility delivered with SQL Server
• Located in the installation Binn directory
• It’s main purpose is to collect diagnostic data
PSSdiag SQLDiag Collectors

What does it collect?
• Event Logs
• Performance Monitor Counters
• Server Configuration
• Error Logs
• Profiler Trace
• Blocking information
• PerfStat Scripts
• Spinlocks, query statistics query hashes
...
• There is a possibility to add your own custom collectors!

How to run it?
Security
• Windows authentication is default
• SQL authentication
– Prompt for password
• The account used to run it
– Must be able to login into target instances
– Must be a member of the sysadmin role
– Must be a member of Administrators
Configuration
• Requires an XML configuration file (specifies what to collect)

Parameters
• PSSdiag /B 14:00:00
• PSSdiag /E +02:00:00
• PSSdiag /B 08:00:00 /E +09:00:00
• PSSdiag /E 02:00:00 /L /Q
• PSSdiag /R /A Myname
• PSSdiag START /A Myname
• PSSdiag /U /A Myname
All command line parameters:
http://msdn.microsoft.com/en-us/library/ms162833.aspx

Resource hit
• PSSDiag itself is negligible
• Collectors are efficient
• Profiler tracing is expensive
• Select output folder carefully
• Do not capture more than you need
• Always test and monitor it!

Extended periods
• Run as a service so logout doesn’t stop collection
• Profiler Trace dominates output file size
• Trace files must always be collected on the server
• Enables real-time NTFS compression (/C1)
• Enable the DeleteOldTraceFiles

DIAG MANAGER

Diag Manager
• GUI tool used to create configuration files
• Can be downloaded for free from:
http://diagmanager.codeplex.com

DEMO
Lets take a look on PSSDiag

SQLNEXUS

SQL Nexus
• Created as a side project at SQL Support Escalation team
• Process the output of PSSDiag/SQLDiag into a database and
runs Reporting Services reports on top of it
• Allows users to create own collections and reports
http://sqlnexus.codeplex.com/

Key Features
• Fast data loading and processing
• SQL Trace data aggregation using advanced logic and pattern
recognition for intelligent statement execution grouping
• Supports multiple databases to store several performance
analysis data sets
• Visualize loaded data via reports
• Extensibility!

Pre-requsites
• Windows 2008 or newer
• SQL Server 2008 or newer
• .NET framework 4.0
• RML Utilities

SQL Nexus reports
• Built-in reports for:
– Environment configuration
– Blocking
– Wait statistics
– Resource utilization
– Interesting events
– Missing indexes
– Data Statistics
– Virtual file stats

Bottleneck Analysis

Read Trace Reports

RML Utilities
• Replay Markup Language (RML) Utilities for SQL Server
https://support.microsoft.com/en-us/kb/944837
• Package contains:
– ReadTrace
– Reporter
– OStress
– OStress Replay Control Agent (ORCA)

ReadTrace
• Command line tool for processing Profiler traces and Extended
Event traces
• ReadTrace consumes as input trace (.TRC) or (.XEL) files and
.CAB or .ZIP files which contain .TRC files.
• The outputs from ReadTrace can be .TRC files, .RML files and
the Performance Analysis (PerfAnalysis) database.
• RML Utilities have great documentation

Relog
• Command line tool for processig performance counter logs
• Possible formats:
– Text-TSV (tab delimited text)
– Text-CSV (comma-delimited text)
– Binary-BIN
– SQL
• Has possibility to filter specified counters
https://technet.microsoft.com/pl-pl/library/bb490958.aspx

DEMO
Lets take a look on SQLNexus

CUSTOM DATA COLLECTIONS

Custom Data Collections
• Add your SQL scripts to the _MyCollectors DiagManager folder
• Make sure the resultsets have a tag that uniquely identifies
them

• Custom Collections are added to the CustomDiag.XML file in
the _MyCollectorsfolder
• It is quicker to modify this XML file than do it through the UI

• Uses a custom import process
• By modifying a XML configuration file, you can have SQL Nexus
import your custom data collection from PSSDiag
• Add the name of the rowset to TextRowsetsCustom.xml
• Located where you installed SQL Nexus

DEMO

PAL TOOL

PAL Tool
• PAL – Performance Analysis of Logs
• Can be downloaded for free from: http://pal.codeplex.com/
• Allows you to set custom thresholds or use threshold already
configured for your workload
• Requires MS Chart Controls

PAL Wizard
• Carefully choose options and answer questions
• Processing will take time

PAL Output
• Graphs with thresholds
• Alerts summarized in time
slices

PAL Output
• The output is color coded to let you know the areas to focus
on
– You do have some control over this through the threshold files
– Not everything in red actually means something
• You must know what to look for

DEMO
Lets take a look on PAL Tool

When to Use Which Tool?
PSSDIAG / SQLNexus
• More targeted performance analysis
• Need to view SQL internal resources (waits, blocking chains,
query plans)
• Short timespan for collection
PAL
• Great for overall system performance
• Benchmark
• Long duration

SQL SERVER
PERFORMANCE DASHBOARD

SQL Server Performance Dashboard Reports
• Set of SSRS performance reports that integrate into SSMS
https://www.microsoft.com/en-us/download/details.aspx?id=29063
• Custom reports made to make
performance monitoring easier.
• Great for tracking down trickier
performance issues

Installation
• Download from web page
• Run *.msi package
• Execute setup.sql scripts
• Add reports to SSMS

QUESTIONS?

PLSSUG - Troubleshoot SQL Server performance problems like a Microsoft Engineer

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