The document introduces workload management features in SAP HANA SPS 10. It describes different workload types like OLTP, OLAP, and mixed workloads. It then discusses how system resources like CPU, memory, and priority were previously controlled using configuration parameters. The main new feature introduced is workload classes, which allow administrators to define resource policies for different workloads and applications. Workload mappings ensure the correct workload class is applied based on connection properties. Administrative tools and monitoring views are provided for workload classes.

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SAP HANA SPS 10 - What’s New?
Workload Management
SAP HANA Product Management June, 2015
(Delta from SPS 09 to SPS 10)

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Agenda
Introducing HANA Workload-Management
 Workload Types in HANA
 Statement Execution and Resource Handling
Controlling resources in the HANA system (as of SPS09)
 CPU consumption and CPU binding
 Memory allocation
 Prioritization
Workload Classes
 Usage of Workload Classes
 Administration and Monitoring of Workload Classes
 Mapping of Workload Classes
Demo

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Workload Types in HANA
Workload Types
OLAP Workload OLTP Workload Mixed Workload Internal Workload
 complex statements
 long-running
 mostly CPU-intensive, mostly
memory-intensive
 e.g. reporting in Datawarehouse
systems
 simple statements
 short-running
 mostly less CPU-intensive,
less memory-intensive
 e.g. transactions in ERP
systems
 OLAP + OLTP
 e. g. modern ERP systems,
with transactional and analytical
reporting
 housekeeping + admin tasks
 could be CPU-intensive,
memory-intensive
 e.g. merge, garbage collection,
backup, savepoint
Balance and manage all workload types in HANA for best response time and throughput based on customer needs !

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Statement Execution and Resource Handling
Session Layer
Execution
Plan
“statement”
“(simple) OLTP”
Jobs
“may delegate statement execution”
SQLExecutor
Thread-Pool
“HANA system-tasks”
Thread-Pool
“assign available threads”
“assign available threads”
Application A
JobExecutor
“(complex) OLAP”
OP
OP
OP
Session Context for Application A
“set statement-context
per session“
Information about resource policy for memory, concurrency, priority for a statement
“read config data”“
.ini files
system-tables
Plan
Operators

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Controlling resources in the HANA system (as of SPS09)
CPU resources
• [indexserver.ini] max_sql_executors controls the max #of parallel threads that can be used for simple (OLTP-) statements
• [indexserver.ini] max_concurrency controls the max #of parallel threads executing jobs for complex (OLAP-) statements
note: the max #of parallel threads can be exceeded in some situations in the HANA systems, due to internal reasons
• [daemon.ini] affinity-parameter assigns CPU-resources per HANA process
Memory allocation
• [indexserver.ini] statement_memory_limit controls the memory consumption of statements ( can be altered per db-user manually)
Execution priority (available with SPS09)
• ALTER USER SYSTEM SET PARAMETER PRIORITY = <prio>
• sets user-level priority for all statements in the current connection between 0 …9 (default: 5)
.ini-parameters control resource management of the complete HANA-DB

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Introducing Workload Classes
Datamart-App
Administrator Tasks:
• create workload classes
• create workload mapping
ERP-App, App_Name “MRP”
ERP-App, App_Name “MyDashboard”
DB-user “DATAM”
DB-user “ERP001”
DB-user “ERP001”
HANA System
Workload “DATAM”session-context
session-context
session-context Workload “BW”
resource-config
resource-config
Workload “MRP”
resource-config
Workload “MYDASH”
resource-config
statm-context
statm-context
statm-context
mapping
mapping
mapping

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Administrating Workload Classes
Step 1: Create Workload Class (WORKLOAD_CLASSES)
 Create a workload class in the HANA Studio SQL console with the following resource properties:
– statement_thread_limit = max #of parallel threads to execute a statement
– statement_memory _limit = max #of memory allocated per statement
– statement_priority = execution priority for a statement
 You can set all resource properties or only a subset
 SQL Syntax: <CREATE|ALTER|DROP> WORKLOAD CLASS <NAME> [SET <PROPERTY LIST>]
 Example: create workload class "MRP" set 'PRIORITY' = '6', 'STATEMENT MEMORY LIMIT' = '2' , 'STATEMENT THREAD LIMIT' = '20'
Step 2: Create Workload Mapping (WORKLOAD_MAPPINGS)
 Create workload mapping based on client context information (‘ClientInfo object’ sent by the HANA application):
– Client = client number (usually applied by SAP ABAP applications, like SAP Business Suite / BW)
– Application Name = name of the application
– Application User Name = name of the application user (usually the user logged into the application)
– User Name = name of the db-user (the HANA user, where the application is connected technically with)
 SQL Syntax: <CREATE|ALTER|DROP> WORKLOAD MAPPING <NAME> WORKLOAD CLASS <WC NAME> [SET <PROPERTY LIST>]
 Example: create workload mapping "MRPCLIENT" workload class "MRP" set 'USER NAME' = 'ERP001', 'APPLICATION NAME' = 'MRP';

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Monitoring Views for Workload Classes
 SYS.M_CONNECTIONS
 SYS.M_PREPARED_STATEMENTS; SYS.M_ACTIVE_STATEMENTS

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Mapping of Workload Classes
Mapping of Workload Classes
 Always the most specific workload class is mapped to a db-client
 If no workload class can be mapped, the internal default values or .ini-parameter of the HANA-db are applied (default)
– statement_thread_limit => [internal default value] ‘0’  no limit
– statement_memory_limit => [.ini] statement_memory_limit
– statement_priority => [internal default value] ‘5’
 If a workload class has only a subset of the resource properties defined, the internal default values or .ini parameter-values are applied for the remaining properties
Client
WCLERP
WCLALF
APPLICATION_USER_NAME = ‘ALF’
USER_NAME = ‘ERP001’
APPLICATION_USER_NAME = ‘ALF’
CLIENT = ‘001’
APPICATION_NAME = ‘MRP’
USER_NAME = ‘ERP001’
CLIENT = ‘001’
APPICATION_NAME = ‘MRP’
USER_NAME = ‘ERP001’
Mapping

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Mapping of Workload Classes
Priority of ClientInfo properties for mapping
 If two workload classes have the same matching number of ClientInfo properties, the workload class is applied that matches properties with
higher priority
 There is the following priority:
1. Application_User_Name
2. Client
3. Application_Name
4. User_Name
Client
WCLERP
WCLALF
APPLICATION_USER_NAME = ‘ALF’
CLIENT = ‘001’
APPICATION_NAME = ‘MRP’
USER_NAME = ‘ERP001’
CLIENT = ‘001’
APPICATION_NAME = ‘MRP’
USER_NAME = ‘ERP001’
APPLICATION_USER_NAME = ‘ALF’
APPICATION_NAME = ‘MRP’
USER_NAME = ‘ERP001’
Mapping

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Additional Remarks
Privileges
 Managing workload classes requires the ‘WORKLOAD ADMIN’ privilege
Changing Workload Classes
 Changes of workload classes or mappings will only be applied, if a (connected) db-client re-connects
 You can change the running session-context of a connected db-client via SQL-command ‘ALTER SYSTEM ALTER SESSION SET'
Multi-Database Containers (MDC)
 Workload classes work also in a multi-database environment, but you need to define workload classes for each single db-container
Scale-out
 Workload classes are applied to the complete HANA-db in a scale-out environment, but not to each single node
Dropping users / workload classes
 If you drop a user in the HANA-db, all related workload classes are dropped
 If you drop a workload class, the related mappings are dropped
Setting the ClientInfo in the application
 The client info is a list of property values pairs that an application can set in in the client interface

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DEMO

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Disclaimer
This presentation outlines our general product direction and should not be relied on in making
a purchase decision. This presentation is not subject to your license agreement or any other
agreement with SAP.
SAP has no obligation to pursue any course of business outlined in this presentation or to
develop or release any functionality mentioned in this presentation. This presentation and
SAP’s strategy and possible future developments are subject to change and may be changed
by SAP at any time for any reason without notice.
This document is provided without a warranty of any kind, either express or implied, including
but not limited to, the implied warranties of merchantability, fitness for a particular purpose, or
non-infringement. SAP assumes no responsibility for errors or omissions in this document,
except if such damages were caused by SAP intentionally or grossly negligent.

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Thank you
Contact information
Rüdiger Karl
SAP HANA Product Management
AskSAPHANA@sap.com