Performance Issues in SAP BI/BW

Performance can be 

 Reporting Performance, 

 Load Performance or 

 General Performance.

For improving Report Performance

-Create Aggregates on Infocubes

-Use OLAP Cache for buffering the query result to reduce burden on database

-Pre-caliculated Web templates helps to distribute workload of running report to off-peak hours and can have report result set ready for very fast access to data.

-Use small amount of result data as starting point of any queries and do the drill down

-Avoid reporting on ODS

-If you use exclusion in reporting (<>), the indices are not used, so avoid using the exclusion but use inclusion.

-Use read mode "read when navigating and expanding the hierarchies"

-Use compression of infocube since the E table is optimized for queries

-Create additional indexes at manage data target - performance tab

-Run DB Statistics often

For improving Load Performance

-Check the ABAP Coding at transfer and update rules this would make performance slow

-Keep available of more dialog processes available and do load balance to different servers

-Indexes on source tables

-Use fixed lengh files if you load data from a flat files and put the files on the application server

-Prefer to use SAP delivered standard extractors

-Use PSA and Datatarget parallel option in the infopackage load settings

-Start several infopackages parallel with different selection options

-load master data before loading transaction data

For improving General Performance

-Archieve and delete the old data

-Use line item dimensions for large data

-Use BW statistics cube to monitor the performance

-If you are not going to use ODS for reporting desable the Bex reporting flag