SAP HANA Articles - Page 27 of 58

The topology of SAP HANA system is maintained by Name Server. This is used to manage all the running components and data stored in each component.

The maximum number of columns in a table is 1000.

Maximum column name length supported in a table in SAP HANA is 127 chars.

Maximum table name length supported in SAP HANA is 127 characters.

In SAP HANA, a maximum number of tables in a schema are 131072. To create a table, you have to right click on Schema name → New Table

Index server contains SQL/MDX processor to handle query statements for the database. When SQL or MDX is fired for SAP HANA system, an Index Server takes care of all these requests and processes them. All HANA processing takes place in Index Server.Index Server contains Data engines to handle all SQL/MDX statements that come to HANA database system. It also has Persistence Layer that is responsible for durability of HANA system and ensures HANA system is restored to most recent state when there is a restart of system failure.Index Server also has Session and Transaction Manager, which manage transactions and keep ... Read More

SAP HANA 1.0 can replicate data only from few of data sources and only in few formats using Sybase Replication. You can perform batch loading using SAP Data Services and it is optimized only for Business Object 4.0 for reporting.

In SAP HANA Modeling, Graphical Information Views are faster as compared to SQLScript in almost every scenario and also Graphical Information Views are easier for others to understand, remodel and change.There are scenarios where you need SQLScript, but it shouldn’t be viewed as a general-purpose solution to modeling problems.Note:It is never recommended that you code a Calculation View with SQL Script and use it inside another Calculation View with CE Functions as it results in a very bad performance.

You can check the landscape of HANA system, navigate to Landscape tab in HANA studio. Services show all the services running on HANA system.The following screenshot shows SAP HANA system and all the key services running under system Landscape for the same system.You can see the service name corresponding to each server in HANA system landscape.

It is also possible to compress a table in SAP HANA system manually by executing the following SQL statement.UPDATE "table_name" WITH PARAMETERS ('OPTIMIZE_COMPRESSION' = 'YES')This results in deciding whether a compression is required or an existing compression can be optimized. In this scenario, HANA system uses most suitable compression algorithm.When you run the above SQL command, compression status remains the same. You can also force the database to reevaluate compression using the following SQL status UPDATE "AA_HANA11"."SHOP_FACTS" WITH PARAMETERS ('OPTIMIZE_COMPRESSION' = 'FORCE')