Introduction to SAP HANA MDC – Part 1


Since SAP HANA SPS09, there may be an introduction of recent function referred to as “SAP HANA multitenant database containers” (MDC). The aim of SAP HANA MDC is to eradicate the MCOS – A number of Parts One System (A number of SAP HANA techniques on one SAP HANA) or MCOD – A number of Parts One Database (A number of schemas on one SAP HANA) situation that’s not supported for Manufacturing HANA utilization. The virtualization (VMware) and supported {hardware} partition (Lpar, nPartition and and many others) for the MCOS is supported for Manufacturing HANA utilization with some limitation. The SAP HANA MDC is supported on single node HANA, scale-up HANA node and scale-out HANA nodes.

Mainly, SAP HANA with MDC enabled containing ONE system DB and not less than one tenant DB with a single System quantity and System ID. After we transformed a single HANA DB system to MDC, it should include a system DB and the tenant DB (tenant depend 0). All of the tenant DB in a MDC system share the identical set up of the HANA database system software program (which imply all of the tenant DB working with the identical SAP HANA revision quantity) and the identical computing sources. For the recent set up of SAP HANA, it should having an choice of “single_container” or “multiple_containers” as within the display captured 1. In case you are deciding on the “multiple_containers”, it should solely create the SYSTEM DB and you will have to create the primary tenant DB (tenant depend 1) manually through the SAP HANA DB cockpit. Do differentiate on the tenant depend quantity for the situation of recent set up and situation of single DB system conversion to SAP HANA MDC. The tenant depend quantity is essential on the port project in tenant databases. This weblog is predicated on the situation of single DB system conversion to SAP HANA MDC.

Display screen captured 1: SAP HANA set up choice

System DB saved the system-wide panorama data (identify server is working on System DB), and offers configuration and monitoring system-wide. Do take observe that the identify server of the system database in a multiple-container system doesn’t personal topology data. Database-related topology data is saved within the related tenant database catalogue. However, the providers that don’t persist information resembling compile server, pre-processor server can be working on System DB. The SAP Net dispatcher is working as separate service the place it’s accountable to route the incoming HTTP requests from purchasers to right XS server based mostly on digital host names.

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We have now the System ID = HBT and System quantity = 00 working on AWS, the next display captured 2 exhibiting the providers working on SYSTEM DB and the identify server is tag with SQL port 30013 (3<nn>13), this port should be enable within the AWS safety group for the connection from HANA studio.

Display screen captured 2: SYSTEM DB Panorama

Tenant databases encompass its personal index server and the XS server is working within the (grasp) index server of the tenant by default. In fact, we are able to embedded the XS server into every tenant DB index server and embedded into the identify server of the System DB. You’ll not see the XS server from the panorama of the tenant DB in HANA studio whether it is an embedded XS server. The XS providers will be added as a separate service if crucial as nicely. The HANA information and log recordsdata for the SYSTEM DB and tenant DB’s are separated with totally different quantity ID and they don’t share the identical information and log recordsdata (display captured 3, 4 and 5). You could observed that the totally different ports variety of the index server in every tenant within the under display captured. The reason of the ports will particulars in later part.

The tenant DB is remoted from others tenant DB in time period of utility information, consumer’s administration, database catalogue, repository, ports, information recordsdata and log recordsdata.  There’s an choice to activate the cross database entry in SAP HANA MDC system, which imply read-only queries between tenant databases are potential with the database objects like tables and views. Cross-database entry between tenants is inactive by default. SAP observe 2196359 and SAP HANA administration information present extra data on cross database entry in a SAP HANA MDC system.

Display screen captured 3: System DB Volumes

Display screen captured 4: Tenant DB depend 0 with tenant DB identify HBT

Display screen captured 5: Tenant DB depend 1 with tenant DB identify HB2

Devoted ports and connections for SQL, HTTP- based mostly shopper communication and inner communication is assigned to every tenant database as within the display captured 6. Port quantity vary for tenant databases are range from 3<nn>40 to three<nn>99 which imply the utmost variety of tenant DB created is 20 tenant DB per occasion as a result of every of the tenant DB will occupied 3 port numbers for SQL, HTTP and inner communication.

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There are few eventualities on the port project within the SAP HANA MDC, keep in mind that port project of tenant DB is predicated on computerized port quantity project and the port quantity is essential for the community people to open the port for incoming request to the SAP HANA server.

Situation 1:

In case you are changing a single-container system to a multiple-container system. These will created a system DB with the port project of three<nn>01, 3<nn>13, 3<nn>14 and one tenant database (depend 0). This tenant DB (depend 0) can be having the identical port quantity as earlier than the MDC conversion which is 30<occasion>03 (inner communication), 3<occasion>15 (SQL), 3<occasion>08 (HTTP). After that, the following handbook creation of tenant DB (depend 1) can be routinely assigned to numbers 3<occasion>40—42. Then, the extra handbook creation of tenant DB (depend 2) can be routinely assigned ports the subsequent three out there port numbers: 3<occasion>43—45. This can be exhibiting extra particulars in one other weblog “Convert SAP HANA Single DB to MDC”.

Situation 2:

A recent SAP HANA set up with the choice of multiple_containers will create solely a system DB after the set up. After that, you will have to create the primary tenant and this tenant can be routinely assigned by 3 ports quantity, 3<nn>40-3<nn>42. Then the twond tenant DB can be routinely assigned by 3<nn>43-3<nn>45, the threerd tenant DB can be routinely assigned by 3<nn>46-3<nn>48.

The port quantity 3<nn>13, 3<nn>41 and three<nn>44, 80<nn>, 43<00> will required to open for the incoming request to the SAP HANA MDC server (let say we now have 2 tenant DB’s as per the display captured 6).

Display screen captured 6: Connections for SAP HANA MDC (image taken from SAP HANA MDC Operation information)

As you guys conversant in the OS consumer <sid>adm consumer in HANA system, each tenant databases in SAP HANA MDC system run underneath the OS consumer <sid>adm with low isolation by default. You could create every particular person OS consumer for every tenant databases and configure the excessive isolation if you want to tighten your SAP HANA MDC safety which imply the processes of particular person tenant databases can be working underneath devoted OS customers belonging to devoted OS teams, as a substitute of all database processes working underneath <sid>adm.

The database SYSTEM consumer exists in each tenant database and likewise exist in system database which imply every of the tenant databases having their very own SYSTEM consumer and password together with the system database. SYSTEM consumer is the database superuser, the SYSTEM consumer in system database having further privileges like creating/dropping tenant databases, altering the configuration recordsdata of tenant databases, performing databases backup.

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The backup of SAP HANA MDC together with the SYSTEM database backup and every of the tenant databases backup. You may backup the HANA databases by utilizing SAP HANA DB cockpit, SAP HANA studio, hdbsql command, scripting, backint and SAP DBA cockpit in Netweaver system. The restoration is simply supported on tenant database to tenant database restoration which imply the restore from single DB system to tenant DB or vice versa will not be supported. The backup/restore can be focus on extra particulars in my different weblog “Tenant DB configuration and backup/restore (SAP HANA MDC)”.

For the excessive availability and catastrophe restoration on SAP HANA MDC, it simply applies to your complete SAP HANA situations which together with the system DB and all of the tenant databases. You may’t choose particular tenant DB for the HANA system replication, it is just supported on “all or nothing” idea.


In a nutshell, if the enterprise is in search of a price efficient options on SAP HANA with non-giant dimension of conventional DB dimension (for SAP BW and SAP ERP) that plan emigrate to SAP HANA, they’ll think about the SAP MDC function to leverage or optimize the HANA server. For instance, buyer can at all times having their SAP ERP on HANA, SAP BW on HANA right into a identical Manufacturing HANA equipment with SAP HANA MDC allow (It might want to have 2 PRD HANA equipment earlier than the SAP HANA MDC). You could seek advice from SAP Observe 1661202, 1826100 and 1681092 for the whitepaper of the appliance/situation that working on SAP HANA MDC system.

Should you discovered this weblog is fascinating, it’s possible you’ll observe my subsequent weblog on “Convert SAP HANA Single DB to MDC”, for these already with SAP HANA single DB and plan to transform it to SAP HANA MDC.

Convert HANA single DB system to Help MultiTenant Database Containers (MDC) on AWS – Half 2

Tenant DB configuration and backup/restore – Half 3

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