Hi,
basically indexes improve the performance.
1. primary index
2.secondary index
primary index system will automatically will take and secondary index we have to create where ever possible.
ex- b tree index and bitmap index.
according to delete and create index - these two options will use while designing the process chains.
ex- assume a book - with page numbers will search past but with out page numbers it will take time finding the chapters.
with out index it will improve the loading performance.
with index improve the reporting performance.
Thanks,
Phani.