Monday, 18 January 2016

DB Refresh of HANA Based systems using HANA Studio Backup/Recovery without SWPM

DB Refresh using HANA Studio DB Restore  with SID Modification -  NON SAPinst

HANA Studios DB restore option and hdbuserstore there after makes the whole process of a  System copy a lot simpler . The only limitation would be that the target schema would still remain as source.

The idea of this blog is to explain the process of performing  a simple homogeneous system copy of a HANA based system using the recovery of the source backup on the target HANA DB using HANA Studio.

In this case ,we will be  considering a situation of copying a Prod backup and refreshing it in a already running quality system

These are the salient steps involved in achieving this

Step 1 ) Take a complete DB backup of the source Database
Step 2) Move the database backup to the Target system
Step 3) Using HANA Studio recover the source db in the target HANA box
Step 4) Supply the license text so that the HANA Studio can automatically apply the license after install
Step 5) Modification of Schema access at the target DB
Step 6) Modify the default key  using the hdbuserstore on the application servers  and DB instance.
Step 7 ) Start sap
Step 8 ) Post activities.
Activities in the Source System :

Step 1 - Backup of the source DB .

Use the HANA studio backup studio to take a complete DB backup either at the disk level or using Backint.

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Usually this should be sufficient to perform a DB Refresh but if you are looking for a  point in time recovery you may want the backups from the log area as well to include them post the recovery.

Step 2 ) : Move the database backup to the Target system

Once the backup is completed you will have to move the backup to a location in the target system , you should have 4 separate files with the your backup prefix . In this case the prefix is “COMPLETE_DATA_BACKUP_20122015”

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Activities in the Target system

Step 3 ) Using HANA Studio recover the source db in the target HANA box

→ Shutdown SAP Application alone

→ Open HANA Studio and right click on the SID ( target) where you want to perform the recovery.
You will have to specify the destination location and the Backup Prefix for the HANA studio to recognize the backups .

HANA Studio Backup/Recovery, SAP HANA SWPM

Complete data backup and not planning to recover log segments you can select the option “ Initialize Log area”... This is something like reset logs in oracle.

Step 4) Supply the license text so that the HANA Studio can automatically apply the license after install

  Post recovery your existing HANA License will be invalid , so here is a opportunity to mention the license text so that that can be installed automatically. If not this can be performed manually later.

SAP HANA SWPM

Proceed with the recovery . Please note that the Target and source version must have the same configuration. Is there are specific configuration thats required in the target system that can be done manually as part of the Post steps.

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Post recovery you should be able to see the Overview tab in HANA Studio with the Memory and Host Details.

However you may expect to see all the schemas under Catalog but it will error out as below. Same would occur when you try to expand Content.

SAP HANA Studio, SAP HANA Backup

The reason being the new SID will probably be looking for a schema name as SAPSID and it cannot find it , so there are few changes that need to be done in the target system

Step 6) Modify the default key hdbuserstore on the application servers and the DB instance.

Go to /usr/sap/<SID>/hdbclient   and execute the below

hdbuserstore set default <dbhost>:<dbport> <dbuser> <dbpassword>

Let say for example our target host is : host01 and Source SID is  PRD and System No : 00  and lets assume that the source schema is SAPPRD and its password is sapprd#!

hdbuserstore set default host01:30015 SAPPRD sapprd#!

The above example is for the Unix system for Windows its a bit different (Refer SAP Note 1709838)

Execute a hdbuserstore list you should find the new Key set as below

KEY DEFAULT
   ENV:host01:30015
User: SAPPRD

This confirms that the key is set .

This has to be done on the appservers , else R3trans -d would fail.

Go back to HANA Studio and you should be able to see the contents under Catalog and Contents. You should also find the source Schema under Catalog.

At this point there is one more thing that needs to be done before we start the apps on the target system.

go to the DEFAULT profiles and modify the /dbs/hdb/schema to SAPPRD ( or whatever your source schema is ) .

At this point you are good to start SAP.

Follow the standard Post Refresh activities from there..

Few points to remember

- > You may want to disable the btc processes before starting SAP
- >  Perform standard post steps like SE06/STMS/BDLS etc and activities specific to your case.

Source: scn.sap.com

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