Hi,
In this post, I have explained step by step configuration of Smart Data Access for Hana Database with error resolutions.
One of main challenges that companies are facing today are
1. Get information in real time to make quick decision on time
2. At the same time, we need to keep control over cost for IT and Technology.
By Keeping Business requirement in mind, SAP has introduced Smart Data Access in SAP HANA which is a Virtualization Technique. This feature is introduced from Hana 1.0 SPS 6 in SAP HANA.
What is Smart Data Access?
SAP HANA smart data access enables remote data to be accessed via SQL queries as if they are local tables in HANA, without copying the data into SAP HANA.
Not only does this capability provide operational and cost benefits, but most importantly it supports the development and deployment of the next generation of analytical applications which require the ability to access and integrate data from multiple systems in real-time regardless of where the data is located or what systems are generating it.
Key Concept of SAP HANA Smart Data Access
Smart Data Access is a technology which enables remote data access as if they are local tables in HANA without copying data into SAP HANA.
It is based on local virtual tables that maps to an existing object at the remote data source site.
Data required from other sources will remain in virtual tables. Virtual tables will point to remote tables in different data sources. It will enable real time access to data regardless of its location and at same time, it will not affect SAP HANA database.
Customers can then write SQL queries in SAP HANA, which could operate on virtual tables. The HANA query processor optimizes these queries, and executes the relevant part of the query in the target database, returns the results of the query to HANA, and completes the operation.
With the SAP HANA 2.0 SPS 00 release, virtual tables have been integrated with result caching in HANA. Static caching has been available as of SAP HANA 1.0 SPS 11, what is new in this release is the support for virtual tables. If you choose to enable the caching feature on virtual tables you can look forward to improved performance by means of avoiding redundant computation of identical and frequent queries. You can enable this feature either directly via the ini file or by using SQL. Also keep in mind that you need to define a cache staleness restriction when configuring.
Restrictions on usage of Smart Data Access:
Data in virtual tables cannot be modified i.e. insert, update and delete operations are not possible on virtual tables. However, we can do select on virtual table and put data in HANA table.
Virtual table does not support BLOB/CLOB data type. Workaround of this problem is to create view on remote table by excluding column of BLOB/CLOB type and then create virtual table with the help of view.
Virtual Tables cannot be used in multi node HANA cluster. However, it is possible to access virtual table from one HANA server to other.
Some analytical view does not support virtual tables.
Need to add below entries in odbc.ini file
[HDB]
Driver=/hana/shared//hdbclient/libodbcHDB.so
ServerNode=:31113
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