about compression

hi,

iam new to sapbw ijust want to know what is the master 1)data we load regularly inSD,MM Funmods.

2)What are the cubes that we can compress regularly in SD,MM,Weekly and monthly as per businedd content avaliable cubes.

3)is there any specific rules defined by SAP while loading the SD,MM datasources.from LIOS&LO's.

4)Shall we contact the basis guy before compression.

5)what kind of problems we can face in case of multiple changeruns.

6)Tell me some tipical errors we faceduring loading data fromR/3and solutions.</b>

Iwill begreatfull to you if icould getrid of all the Doubts above.

Regards.....

Bhadra