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sap hana table storage

Sap hana row and column table differences on data storage

Data is stored as "ROW" within standard row tables where as it is stored as "COLUMN" as far as column table is concerned. In a row table, all rows are structured the same way. Data will be unique within a row but would be occurring many times among all rows. In other words, data is duplicated in a row table. In a column table, the table is organized by column instead. Data duplication is replaced by a link to the first data occurrence. This is the data compression. It is performed automatically on column tables.

Sap hana table storage type explanation and example :

The following standard create table syntax can create either a row table or a column table by default but you can notice data layout is the same for either table type.


 -------- For that particular table definition ------ 

 CREATE TABLE ATABLE ( 
	ID INTEGER, 
	NAME VARCHAR(10), 
	SURNAME VARCHAR(20), 
	DEPARTMENT VARCHAR(30), 
	PRIMARY KEY (ID) 
 );

 -- Find out what is the underlying data storage structure
 -- when the table is defined as column or when it is a row table type.
 
Row table underlined data storage Column Table underlined data storage

Row Data

1

ROSY
FLOWERY
RECEPTION

2

DANIEL
ADAM
RECEPTION

3

DANIEL
SMITH
RECEPTION

4

ROSY
SMITH
RECEPTION

5

PETER
FLOWERY
RECEPTION

6

PETER
SMITH
RECEPTION

7

PETER
LORENCE
RECEPTION

8

LORENCE
PETER
RECEPTION

9

DANIEL
LORENCE
RECEPTION


Column Data

NAME

ROSY
DANIEL
DANIEL
ROSY
PETER
PETER
PETER
LORENCE
DANIEL

SURNAME

FLOWERY
ADAM
SMITH
SMITH
FLOWERY
SMITH
LORENCE
PETER
LORENCE

DEPARTMENT

RECEPTION
RECEPTION
RECEPTION
RECEPTION
RECEPTION
RECEPTION
RECEPTION
RECEPTION
RECEPTION

Column Data compression example

NAME

ROSY
DANIEL
PETER
LORENCE

SURNAME

FLOWERY
ADAM
SMITH
LORENCE
PETER

DEPARTMENT

RECEPTION

See Also : Different ways to create tables
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