Oracle 索引数据字典、基于函数的索引

 

user_indexes 字典视图包含了索引名和唯一性，

user_ind_columns视图包含了索引名、表名、以及列名

dba_indexes dba_ind_columns 同理

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select ix.table_owner,        ic.table_name,        ic.column_name,        ic.index_name,        ic.column_position,        ix.uniqueness   from dba_indexes ix, dba_ind_columns ic  where ix.index_name = ic.index_name

　

　基于函数的索引

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SQL> create index upper_test_table_name_idx on test(UPPER(table_name));   Index created. 当查询中使用UPPER(table_name)作为条件时，就会使用索引；否则执行全表扫描 SQL> select * from test where upper(table_name)='SDO_TXN_IDX_DELETES';   TABLE_NAME ------------------------------ SDO_TXN_IDX_DELETES SDO_TXN_IDX_DELETES SDO_TXN_IDX_DELETES SDO_TXN_IDX_DELETES SDO_TXN_IDX_DELETES   SQL>