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Compression in Brief

COMPRESSION :

-Every cube will have two fact tables /F & /E  and have same structure. 

  Before run the query i compress the cube it deletes the request id information and maintain is zero  the data will goes to F to E table.  Then report come for both the tables.

Steps for Compression :

Goto Cube–>Manage–>Collapse tab
and select latest request id click release in the request tab there is green mark in compression, after compression we cant delete the request.

* When we create cube it creates 2 fact tables F & E, Structure of E & F tables will be same
* Whenever we load data to cube, data will be loaded to F table
* Whenever we do compression  it deletes the  request id information & aggregates the records based on characteristic value combination  and put the data     into E table
* After Compression data will move from F table to E table

F table :

Figure1.jpg

E Table :

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* When do reporting on the Info cube data come from F table & E table
* Once the compression is done in the info cube we cannot delete the data based on request number.
* When we specify a request to compress, the specified request & all the requests below it will get compressed
* When you do compression in collapse tab there is checkbox   – zero elimination, if you select this check box, after aggregating the records if there is any key figure value with ‘zero’ it will delete those records.

Regards,

Prasad.

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