BW statistics& index

Question

hI,
  This is madhavi. can any body explain abt BW statistics& indexes.
in real time how do we use these.. on what based we make decision on these.
Regards,
Madhavi

Answer 1

Hi,
in rsa1->environment->bw statistics for infoprovider
BW Statistics is useful to know the performences like aggregates,quaries and etc..
After the installation you have to also load the Stat cube manually or using process chain once a while upon your business requirements.
Only then you can see the request and the data into the cube.
INDEXES
Re: Index in cube   
Posted: Apr 26, 2007 8:32 PM    in response to: naga yadavalli       Reply 
1. What is the use of create index and delete index in the performance tab of cube........
Index ( if properly created) will reduce the query response time. While an object gets activated, the system automatically create primary indexes. Optionaly, you can create additional index called secondary indexes.
2. How does it effect the performance...
As said in 1. if the index is creates for a right reason, it will speed up the query search time. If not, it will pull down the performance.
3. When and why do we sometimes use in process chains? (delete index and create index)
Before loading data, it is advisable to delete the indexes and insert them back after the loading
The main objective of Indexs it will improve the Query Response time.
Indexes act like pointers for quickly geting the Data.When u delete it will delete indexes and when u create it will create the indexes.
When loading we delete Bcs during loading it has to look for existing Indexes and try to update so it will effect the Data load performence so we delete and create it will take less time when compared to updating the existing ones.
There is one more issue we have to take care if u r having more than 50 million records this is not a good practice insteah we can delete and create during week
When loading we delete Bcs during loading it has to look for existing Indexes and try to update so it will effect the Data load performence so we delete and create it will take less time when compared to updating the existing ones
The primary index of a table is always a unique index since the index fields form the key of the table, uniquely identifying each data record.
You can define a secondary index as a unique index when you create it. This ensures that there are no double records in the table fields contained in the index. An attempt to maintain an entry violating this condition in the table results in termination due to a database error
Hareesh