SAP HANA 2 – Dynamic Tiering Overview including HANA Monitoring

HANA2 Dynamic Tiering

This is a compilation of notes collected exploring and testing features of Dynamic Tiering in HANA2

May 2017

This is a ‘continuation’ of the first blog, SAP HANA Dynamic Tiering Test-drive, exploring the features of Dynamic Tiering before the HANA2

By OZSoft Consulting for ITConductor.com

Author: Terry KempisEditor: Linh Nguyen

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http://www.itconductor.com/blog/sap-hana-dynamic-tiering-test-drive

References

HANA2 Dynamic Tiering Guides

• Dynamic_Tieiring_Option_Release_Notes

• Dynamic_Tieiring_Option_Master_Guide

• Dynamic_Tieiring_Option_Installation_Guide

• Dynamic_Tieiring_Option_Administration_Guide

HANA2 Administration Guide


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Introduction (1)

The first blog SAP HANA Dynamic Tiering Test-drive covered the following• Overview of HANA’s multi-temperature data management (HOT, WARM, COLD)

• Installation of DT and adding host, data provisioning to a tenant DB and creating extended storage (ES)

• WARM table

1. Create WARM table using ES

2. Copy data from HOT to WARM table, and deleting the data from WARM

3. Creating view ‘joining’ HOT and WARM table for transparent access

4. Using visualize plan showing access to HOT and WARM table

• Backup

• Monitoring/Reporting

• HANA Cockpit tiles on DT


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Introduction (2)

This blog will focus on following

• Co-host deployment

• Multi-Store Table oCreation

oAging and anti-aging

oVirtualize Plan

• Dynamic Tiering Tiles in the new HANA2 Cockpit

• New Backup feature/support in HANA2


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Deployment


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Pre-HANA2(Production)

HANA2(Production)

Host1 Role=Worker

Host..nRole=Extended Storage

Worker/Standby

Cohost Deployment is not recommended in production

HOST1Host Role (Worker, Extended Storage)

HOST2 Role (Worker, Extended

Storage Worker/Standby)

Host.nRole=Worker

Host..nRole=Extended Storage

Worker/Standby

Cohost deployment in production is supported. ES configuration parameters available to avoid impact on performance

Dynamic Tiering Installation / Add Host role

• Using HANA Cockpit (Life Cycle Management)


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Add role to existing host

Installation

HANA2 Cockpit – Dynamic Tiering

When an ‘extended storage’ has been provisioned to a tenant DB, the Dynamic Tiering options will appear in HANA2 Cockpit for that tenantDB


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Dynamic Tiering Tables

There are two types of tables in Dynamic Tiering option

1. Extended table - table specifically created with all data stored into the extended storage (ES).

This was explored in the previous blog SAP HANA Dynamic Tiering Test-drive

2. MultiStore table – partitioned table with some partitions stored in the in-memory, and some partitions in the extended storage – new in HANA2.

The following slides shows the differences on the table creation, moving data into ES, making the access to the table transparent – regardless of the location of the data.


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Dynamic Tiering Tables


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Extended TableA table can only reside in

either in-memory (HOT) or extended storage (WARM)

WORKER host(In-Memory)

HOT Tables(e.g.

TSP06_HOT)

Extended Storage host

WARM Tables(e.g.

TSP06_WARM)

MultiStoreMultistore table can have some part(s) in in-memory, and some parts in extended storage

HOST – roles (WORKER, ES Worker)

In-Memory

TSP06 tablePart1..Part2..Part3

Extended Storage DBspace

TSP06 TablePart4..Part5..

Dynamic Tiering - Table creation


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Extended Table

WORKER host(In-Memory)

HOT Tables(e.g.

TSP06_HOT)


WARM Tables(e.g.

TSP06_WARM)

MultiStore TableDefine multistore table as partitioned, with some partitions in in-memory, while other partitions using extended storage


In-Memory TSP06 table

Part1..Part2..Part3



• CREATE TABLE TSP06_HOT …• CREATE TABLE TSO06_WARM USE

EXTENDED STORAGE

CREATE VIEW TSP06_ALL..JOIN TSP06_HOT, TSP06_WARM

The view will make the change transparent to existing access calls

CREATE TABLE … PARTITON BY RANGE.. USING DEFAULT STORAGE (Partition

definition) USING EXTENDED STORAGE (Partition definition)

(NO View needed)

Moving data (archiving/un-archiving)


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Extended Table

WORKER host

HOT Tables(e.g.

TSP06_HOT)


WARM Tables(e.g.

TSP06_WARM)

MultiStore TableAging – moving data from in-memory to ES

ALTER TABLE …ALTER PARTITION.. USING EXTENDED STORAGE

(partition definition)


In-Memory TSP06 table

Part1..Part2..Part3



Step 1INSERT INTO TSP06_WARM

SELECT * from TSP06_HOTWHERE (criteria)

Step 2DELETE FROM TSP06_HOT WHERE (Criteria as per insert)

Moving data from In-Memory to ES

UN-Aging – moving data from ES to in-memory

ALTER TABLE …ALTER PARTITION.. USING DEFAULT STORAGE

(partition definition)

Multi-Store Table (1)


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In-Memory

In-Memory

Extended Storage

Defining table with range partitioning on column PDPAPER – some partitions in DEFAULT STORAGE (In-Memory), some in Extended Storage

Multi-Store Table (2)


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Partition information/Table definition

Virtualize Plan (1)

Select * (all data, from in-memory and extended storage)


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Virtualize Plan (2)

Select data from partition 1 and 2 (from In-Memory)


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Only partition 1 and 2 accessed – extended storage not involved

Virtualize Plan (3)

Select data from partition in the extended storage only


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Other options (1)

A table can be moved to extended storage using HANA Studio


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AFTER CONVERSION

For a partitioned table where all partitions were in DEFAULT storage, using this option will result in losing the partitioning values – i.e. will end up as extended storage table (not partitioned). Use ALTER partition instead

Other Options (2)

A table using extended storage can be converted to use in-memory, through HANA Studio


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AFTER CONVERSION

BACKUP (delta and incremental)

Delta (differential) and Incremental now supported for tenant with extended storage


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HANA2 Dynamic Tiering - Alert

Alert series 5nn are related to Dynamic Tiering


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Additional notes (1)

• With HANA2, co-deployment is introduced in production, with new esserver.ini parameters to put threshold on the host so the extended storage activities does not impact the production performance

• As per OSS note 2086829, Dynamic Tiering licensing is ‘based on compressed storage on disk’ – not on memory

• Delta store feature allows concurrent update on table in extended storage

• Take note on sizing algorithm when allocating the DBSPACES – refer to the DT Administration Guide ‘Dbspace Sizing’.

• 2394124 - SAP HANA 2.0 Dynamic Tiering - Additional Information


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https://launchpad.support.sap.com/#notes/2394124

Additional notes (2)

In MDC,

• The one-to-one relationship between tenant DB and extended storage (and vice-versa) still exist

• There can only one extended storage in a host

• Currently only one esserver service per host i.e. Tenant1 with ES in node1, and Tenant2 with ES in node2

This is still the case for HANA2 SPS01, i.e. if another tenant requires extended storage, it has to be created into another node.

• More information related to SPS01 on OSS note 2422585.

• System Replication - (extract from Admin Guide)• The operation mode logreplay_readaccess is not supported with

systems having Dynamic Tiering services.


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Monitoring Dynamic Tiering with IT-Conductor


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If the DT is on a separate host, the DT host will monitored similar to the other hosts. In this example, ozdtnode1 is the extended_storagehost

If the dynamic tiering is co-deployed, the service ‘esserver’ will appear on that host’s services.

• Any Questions?

• Contact Info:

Linh Nguyen [email protected]

Terry Kempis [email protected]

Let

itconductor.com

@itconductor

mailto:[email protected]

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SAP HANA 2 – Dynamic Tiering Overview including HANA Monitoring

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