SAP MaxDB Expert Session

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1 SAP MaxDB Expert Session SAP MaxDB : Kernel Parameter Handling Christiane Hienger June 11, 2013 Public

2 SAP MaxDB Expert Session SAP MaxDB Kernel Parameter Handling Christiane Hienger Heike Gursch IMS MaxDB/liveCache Development Support June 11, 2013

3 Agenda MaxDB Kernel Parameter File Tools to list/change Kernel Parameters Categories and Properties of Parameters Dependencies of Parameters (cserv.pcf) Parameter History Parameter Check Nice to Know RunDirectoryPath and KernelDumpFileName Volume Parameters and Configuration Information MaxUserTasks, MaxCPUs and UseableCPUs 3

4 General Information on Parameters MaxDB kernel parameters are used to configure a SAP MaxDB/liveCache database. Parameters are available for Data and log volume configuration Caches and various memory structures Communication, I/O Process structure, CPU-Usage Log files and traces Optimizer... 4

5 The Kernel Parameter File (1) Location: <PRIVATEDATAPATH>/config Name: <DBNAME> e.g. -rw-r--r-- 1 sdb sdba Jun 15:50 WB5 Format: Binary Tools: DBMCLI, Database Studio (DBMGUI for MaxDB Versions < 7.8 only) SAVE DATA and SAVE PAGES store the content of the current parameter file to backup media 5

6 The Kernel Parameter File (2) Parameter History files (up to 10 versions) <PRIVATEDATAPATH>/config/<instance>.<number> -r--r sdb sdba Feb 15:44 WB5.10 -r--r sdb sdba Feb 16:20 WB5.09 -r--r sdb sdba Feb 16:25 WB5.08 -r--r sdb sdba Mar 16:44 WB5.07 -r--r sdb sdba Mar 10:11 WB5.06 -r--r sdb sdba Mar 09:32 WB5.05 -r--r sdb sdba Apr 15:00 WB5.04 -r--r sdb sdba Apr 15:04 WB5.03 -r--r sdb sdba Apr 15:51 WB5.02 -r--r sdb sdba Apr 15:52 WB5.01 -rw-rw sdb sdba Apr 15:52 WB5.pah 6

7 SAP MaxDB tools to display and change kernel parameters? dbmcli DBStudio Parameter DBACockpit Example: Call: dbmcli d MYDB u control,pass Display all: param_directgetall Display: param_getvalue CacheMemorySize Assign value: param_put CacheMemorySize Calculate: param_checkall 7

8 Categories of Parameters 8

9 Properties of Parameters (1) dbmcli U c param_getfull <parameter name> e.g. CacheMemorySize 9

10 Properties of Parameters (2) dbmcli U c param_getfull <parameter name> e.g. CacheMemorySize 10

11 Parameter Dependencies File: <installationpath>/env/cserv.pcf 11

12 Current Parameter Values in DBACOCKPIT 12

13 Change Kernel Parameters (1) 13

14 Change Kernel Parameters (2) 14

15 Change Kernel Parameters (3) 15

16 Change Kernel Parameters (4) 16

17 Change Kernel Parameters (5) 17

18 Current Parameter configuration (1) The current setting of the parameters is shown by the view ACTIVECONFIGURATION (online mode only) 18

19 Current Parameter configuration (2) The current configuration in offline mode is stored in parameter file <DBNAME> and can be listed via dbcmli param_directgetall / param_directgetallnext KnlMsg/KnlMsg.old shows the configuration of the database during restart 19

20 DBACockpit: Configuration and History of Parameters 20

21 Parameter Check with Database Analyzer: Prerequisites SAP Note Parameter check for livecache/maxdb instances Attachments DbanalyzerParamCheck.SAR Download the attachment into a temporary directory, e.g. /tmp Unpack DbanalyzerParamCheck.SAR sapcar xvf DbanalyzerParamCheck.SAR dbanalyzer_instanceparametercheck.cfg 21

22 Parameter Check with Database Analyzer 22

23 RunDirectoryPath, KernelDumpFile, Diaghistory dbmcli -U c param_directget RundirectoryPath RundirectoryPath /sapdb/wb9/data/wrk/wb9 path where diagnosis information is stored Kernel message files (KnlMsg, KnlMsg.old, KnlMsgArchive) dbmserver log files (dbm.*) Subdirectory DIAGHISTORY Kernel dump File (knldump) Parameter KernelDumpFileName dbmcli -U c param_directget KernelDumpFileName KerneldumpfileName knldump 23

24 Where is the Configuration of Data Volumes stored? Parameter File : : DataVolumeName DISKD5 DataVolumeType F DataVolumeSize : dbmcli db_addvolume DATA... /sapdb/sapdata/diskd5 DBMServer Data Volumes Info page Data 1 Info page Data 2 Info page Data 3 Kernel new Volume OK or fail 24

25 How to check the current configuration with x_diagnose ( Development Support only) 25

26 Kernel Process Structure Coordinator Requestor Console Clock / Timer UKT 1 UKT 4 user user user pager pager Tasks UKT 2 user user user timer UKT 3 UKT 5 server server server logwriter logwriter I/O Worker 0 - n ask Worker 0 - n UKT 6 garbage collector event event UKT 7 tracewriter UKT 8 utility 26

27 MaxUserTasks, MaxCPUs, UseableCPUs User-Kernel-Thread user user user Tasks UKT 2 user user user execute SELECT * FROM tab WHERE col1 = 5 Parameter: MaxUserTasks Parameter: MaxCPUs & UseableCPUs 27

28 More Information about Parameter FAQ: SAP MAxDB Database Parameter Documentation: Parameter: 7aea1/frameset.htm Parameter file: /frameset.htm 28

29 SAP MaxDB Parameter Notes Parameter Notes MaxDB SAP MaxDB Version 7.9 SAP note: SAP MaxDB Version 7.8 SAP note: SAP MaxDB Version 7.7 SAP note: SAP MaxDB Version 7.5/7.6 OLTP SAP note: Parameter Notes livecache: Initial parameter setting SAP livecache version 7.5/7.6 & 7.7: SAP livecache version 7.9: List of new livecache parameters in version 7.9:

30 Questions SAP MaxDB Database Kernel Parameter

31 SAP MaxDB Expert Sessions Learning Map (1) SAP MaxDB Features Session 1: Low TCO with the SAP MaxDB Database Session 6: New Features in SAP MaxDB Version 7.7 Session 8: New Features in SAP MaxDB Version 7.8 SAP MaxDB Installation/Upgrade Session 7: SAP MaxDB Software Update Basics SAP MaxDB Administration Session 2: Basic Administration with Database Studio Session 3: CCMS Integration into the SAP System Session 11: SAP MaxDB Backup and Recovery Session 13: Third-Party Backup Tools Session 19: SAP MaxDB Kernel Parameter Handling SAP MaxDB Problem Analysis Session 5: SAP MaxDB Data Integrity Session 14: SAP MaxDB Tracing Session 12: Analysis of SQL Locking Situations All Expert Sessions (recording and slides) are available for download 31

32 SAP MaxDB Expert Sessions Learning Map (2) SAP MaxDB Architecture Session 18: Introduction MaxDB Database Architecture Session 15: SAP MaxDB No-Reorganization Principle Session 17: SAP MaxDB Shadow Page Algorithm Session 12: Analysis of SQL Locking Situations SAP MaxDB Performance Session 4: Performance Optimization with SAP MaxDB Session 9: SAP MaxDB Optimized for SAP BW Session 16: SAP MaxDB SQL Query Optimization (Part 1) Session 16: SAP MaxDB SQL Query Optimization (Part 2) Session 10: SAP MaxDB Logging All Expert Sessions (recording and slides) are available for download 32

33 Thank You! Bye, Bye And Remember Next Session Feedback and further information: Next Session: SAP MaxDB Remote SQL Server 33

34 Thank you Contact information: Christiane Hienger Development Expert IMS

You can only retrieve the parameter file with a database tool (DBMCLI or DatabaseStudio, DBMGUI (MaxDB Version < 7.8)).

You can only retrieve the parameter file with a database tool (DBMCLI or DatabaseStudio, DBMGUI (MaxDB Version < 7.8)). 1 2 3 4 The system stores the kernel parameters in a parameter file. The system stores this parameter file in the file system in binary format in the directory /config. The name of the