performance analysis tools in sap business information warehouse

BW302: Performance Analysis Tools in SAP Business Information Warehouse 3.5

Mike Eacrett, SAP Labs LLC.

Alexander Peter, SAP AG

© SAP AG 2004, SAP TechEd / Session BW302 / 3

Learning Objectives

As a result of this workshop, you will be able to:

Analyze a query performance issue

Explain different reasons for performance issues

Use a broad set of analysis tools delivered with SAP BW 3.5 and SAP WebAS 6.40

Overview

Workload Monitor

SQL Trace

Query Monitor

Runtime Analysis of Web Templates

Summary

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Checklist – Query and Web Performance – Overview

ST03 / Technical Content

Database OLAP Front-end

1. Data Model

2. Query Definition

3. Aggregates

4. OLAP Cache

5. Pre-Calculated Web Templates

6. Compressing

7. Indices

8. DB Statistics

9. DB and basis (Buffer) Parameter

1. Data Model

2. Query Definition (including OLAP features)

3. Aggregates

4. OLAP Cache

5. Virtual Key Figures / Characteristics

6. Authorizations

1. Query Definition

2. Network

3. WAN and BEx

4. Client Hardware

5. VBA / Java

6. Documents

7. Formatting

8. ODBO / 3rd party

SQL Trace (ST05)

RSRV

RSRT, RSRTRACE

RSRT, RSRTRACE

SQL Trace (ST05)

ABAP Trace (SE30)

IEMON

RSRT, RSRTRACE

Which component contributes most?

Tools

Check these points

Overview

Workload Monitor

SQL Trace

Query Monitor

Runtime Analysis of Web Templates

Summary

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Workload Monitor – What It Is

What it does …

… provides general performance-relevant KPIs

… provides BW-specific performance KPIs for queries

When you use it …

… as entry point for query- or InfoCube-specific performance issues

… to check in which area (database, OLAP, front-end) most of the query runtime is spent

… in order to analyze if aggregates could help

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Workload Monitor – Screenshot

Switch to expert mode

In the BW System Load section you’ll get overview on performance figures for

particular periods

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Workload Monitor – Screenshot

‘Aggregation’ switches between InfoCube and

query view

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Workload Monitor – Screenshot

High ‘Select./Transf.’ ratios might be a good

hint for aggregates

‘All Data’ provides you with further important

key figures

Overview

Workload Monitor

SQL Trace

Query Monitor

Runtime Analysis of Web Templates

Summary

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SQL Trace – What It Is

What it does …

… to check if the DB statistics of your tables are up-to-date

… to check if your indices are existing and non-degenerated

… aggregates are used

… data model is sound

… buffers and caches are used as expected

… records all DB actions

… shows all DB statements

… displays the execution plan for each DB statement

When you use it …

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SQL Trace – Screenshot Execution Plan MS SQL

Note: the execution plan looks different for every DBMS.

Full Table Scan

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SQL Trace – Screenshot Execution Plan MS SQL – 2 –

Create Index on ODS Object for Sold-to-Party:

Index Seek

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SQL Trace – How To Read It

Reading Direction

1. Index Scan

Scan on complete index (clustered index scan means: full table scan)

2. Index Seek

Usage of index

3. Nested Loop

Read from inside out

Read a set of operations on the same level from top to bottom

Example

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SQL Trace – Screenshot Execution Plan ORACLE

Note different node names in ORACLE and in MS SQL

New: cost estimation per node

Overview

Workload Monitor

SQL Trace

Query Monitor

Runtime Analysis of Web Templates

Summary

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Query Monitor – What It Is

What it does …

… enables you to execute and debug queries

… provides settings / parameters for queries

… gives elementary information on queries

When you use it …

… to check if and which aggregates are used for a query

… to have a look at the generated SQL statements

… to check if the OLAP Cache is used

… to get performance statistic figures on the query runtime

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Query Monitor – What It Is

Check Aggregates

Display SQL Statement for query

Show Execution Plan

Show BW Statistics

Bypass Cache, retrieve data from DB

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Demo

Demo

Overview

Workload Monitor

SQL Trace

Query Monitor

Runtime Analysis of Web Templates

Summary

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ABAP Trace – What It Is

What it does …

… records (gross and net) execution times for ABAP function calls, method calls,DB statements, etc.

… can aggregate times and number of calls for each statement (recommended)

… uses variants to restrict tracing to function groups / classes

When you use it …

… to identify those parts of an ABAP coding which consumes most of the time (highest optimization potential)

… to check number of executions per call

… to locate origin of function / method calls

… e.g. to analyze customer specific coding like user exits, virtual key figures, etc.

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ABAP Trace – Screenshots

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ABAP Trace – Gross and Net Times

f2

f1

f3

Time

Gross times:

++ ++

Example:

Net times:

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ABAP Trace – Using Variants

New in SICF

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ABAP Trace – Setting Clock Accuracy

Some multiprocessor architectures have unsynchronized processor clocks

Migration of a process from one processor to the other can lead to negative / implausible execution times

Work-around: use software time measurement routines, i.e. set clock resolution to “Low” – from microseconds to milliseconds

Overview

Workload Monitor

SQL Trace

Query Monitor

Runtime Analysis of Web Templates

Summary

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Summary

When faced with performance issues, use Workload Monitor (or BW Technical Content) to identify the area

The Query Monitor helps to analyze a query in detail (providing DB tools, breakpoints and debugging options)

SQL Trace and ABAP trace may help you for specific database and/or customer-specific ABAP coding problems

© SAP AG 2004, SAP TechEd / Session BW302 / 29

Further Information

Public Web:www.sap.com

SAP Developer Network: www.sdn.sap.com BI

SAP Customer Services Network: www.sap.com/services/

Related Workshops/Lectures at SAP TechEd 2004ABAP353: Quick-Start on Performance Analysis (Hands-On)

Related SAP Education Training Opportunitieshttp://www.sap.com/education/

BW360: BW Performance & Administration

© SAP AG 2004, SAP TechEd / Session BW302 / 30

SAP Developer Network

Look for SAP TechEd ’04 presentations and videos on the SAP Developer Network.

Coming in December.

http://www.sdn.sap.com/

© SAP AG 2004, SAP TechEd / Session BW302 / 31

Q&A

Questions?

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Please complete your session evaluation.

Be courteous — deposit your trash, and do not take the handouts for the following session.

Feedback

Thank You !

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