What is happening in Database?

Hi All,
I am new to SAP BW. Technically I am very much confused about the Info Object , Info Cube, Info Provider, PSA, DSO. I want to know Physically what is happening in the database after creation of above things. Kindly let me know some reference videos or books or any links. Thanks for your support in advance.
Thanks & Regards
Shiva

Hi,
BW - Business Information Warehouse.This is the place where we store lots of information in database and provide the consolidated and cleansed data to the queries in the form of information when reporting.
so during all these process we come across the mentioned objects to fullfil the thing.
InfoObject : Infoboject is the smallest available information in sap bw.i.e..the information (name,amount,country)can be stored in database in the form of Infoobjects.These are place holders to store such information in database.These Infoobjects are mainly classified into Keyfigures,Characterstics.apart from these we have like time characterstics to store time etc...
Infocube : Normally the data can be presented for reporting in many dimensions(like customer,material,region,time etc..)using this infocube.Infocube is structured in such a way...data can be stored in the form of multidimentional star schema in the database.that means the database can be used to store data in most efficient way using this star shema.whole this structure is called as infocube in sap bw.
InfoProvider : these are nothing but either Infocubes or DSOs or multiproviders etc..this is term used to mention when this infocube or DSO provides data for reporting.
PSA : Persistent Storage Area : normally we can bring data into BW from different sources.what ever may be the source after data entered into bw,it will be stored here temporarily.from here the data can be moved to infoproviders(DSO,Infocube etc...).The main purpose of storing data in PSA is,here the data will be stored exactly in the way how it is provided in source system.here we can modify data (if necessary) before transferring into Infoproviders.
DSO (Data Sotre Object) or ODS (Operational Data Store) : This is also another object where we store cleansed and consolidated data in detailed form.this is two dimensional tabular structure.the data is stored in this way in the data base.
and as you are new to sap bw..you have to go bit long way to understand exactly how to deal with each of these objects in real time.please go thorugh the URL...
https://help.sap.com to know in more detail...
hope this is clear for you.
Regards
Ramsunder

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