SQL index operations

1. Create Index

the Create  index index name on table name (column name);

2. Delete Index

drop  index index name;

3. Create composite index

Create  index index name on table name (column name column name 1 ,, 2);

4. query index

 - According to the index name, look-up table index fields

SELECT  *  from USER_IND_COLUMNS WHERE index_name = ' index name ' ; 

 - The name of the table, a table index query 

SELECT  *  from USER_INDEXES WHERE table_name = ' table ' ;

5. Disable and reconstruction

- Disable Indexing 

the ALTER  index INDEX_BMP_DUTY_H Unusable; 

- re-enable indexing, index rebuild 

the ALTER  index INDEX_BMP_DUTY_H rebuild;