Oracle数据库命令速查手册-索引

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 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 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 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;