SAP HANA Architecture
In introduction we have basic knowledge of HANA. In this
blog we are going to discuss about the architecture of HANA. There are various components
which responsible for enhanced computing power of HANA. The architecture of
HANA is divided into 5 parts.
·
Index Server.
·
Preprocessor Server.
Name Server
·
Statistical server.
·
XS Engine.
·
Index server: Index
server is called as heart of SAP HANA. All the processing are done in Index server
only. It has all the required components to process the data. Index server has
following components.
v
Session
and Transaction Management: This is responsible for managing running
sessions and transactions being executed. It keep track of all running and
closed transactions.
v
SQL and MDX
Processor: It is responsible for processing SQL and MDX queries. It has various engines which help to execute the query like Calculation Engine, stored
procedures, Multi Dimension Expression etc. SQL and MDX Processor directs the
query towards correct engine for execution.
v
Data
Engine: It is responsible for execution
all the SQL/SQL script/MDX statements in HANA.
v
Repository:
It manages the versions of meta data such as stored procedures, analytic and attribute views etc. it helps to update to latest versions.
v
Persistence
layer: This is also known as recovery engine. It is responsible for disaster
recovery for HANA Database. It has algorithms designed in such a way that they
backup data after every few minutes. Several save points are provided and logs
are maintained for uncompleted tasks.
Name Server: It holds the Topology of HANA Database i.e. it provides information which server is being used and which data resides on which server.
Statistical Server:
It holds all the information about all the system resources, their allocation
and consumption and also the performance of HANA system.
XS Engine: There
are various ways to transmit data into HANA system. When data is transmitted
using JAVA and HTML applications, XS engine is used to complete the same.
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