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1.creating function-based indexes
sql> create index summit.item_quantity on summit.item(quantity-quantity_shipped);
 
2.create a B-tree index
sql> create [unique] index index_name on table_name(column,.. asc/desc) tablespace
sql> tablespace_name [pctfree integer] [initrans integer] [maxtrans integer]
sql> [logging | nologging] [nosort] storage(initial 200k next 200k pctincrease 0
sql> maxextents 50);
 
3.pctfree(index)=(maximum number of rows-initial number of rows)*100/maximum number of rows
 
4.creating reverse key indexes
sql> create unique index xay_id on xay(a) reverse pctfree 30 storage(initial 200k
sql> next 200k pctincrease 0 maxextents 50) tablespace indx;
 
5.create bitmap index
sql> create bitmap index xay_id on xay(a) pctfree 30 storage( initial 200k next 200k
sql> pctincrease 0 maxextents 50) tablespace indx;
 
6.change storage parameter of index
sql> alter index xay_id storage (next 400k maxextents 100);
 
7.allocating index space
sql> alter index xay_id allocate extent(size 200k datafile 'c:/oracle/index.dbf');
 
8.alter index xay_id deallocate unused; 
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