Check Missing Indexes

Question

Hi All,
We have a Database with many tables using foreign keys. Some of my queries from coldfusion are slow. We are using 11g version.
It's a way to check for missing indexes?
I would like to help the database to perform better, I know this is a huge topic but as new in oracle I need to start somewhere.
Any links or comments will be appreciate it.
Regards
Johnny

Answer 1

i have created a two step process for finding which Foreign key is not indexed
1. create a table having the ddl of all indexes
CREATE TABLE INDEX_TXT_TBD AS
SELECT DBMS_METADATA.GET_DDL('INDEX',INDEX_NAME) TXT FROM USER_INDEXES WHERE INDEX_TYPE='NORMAL' AND INSTR(INDEX_NAME,'$') = 0
2. create a table which will tell the tablename, columnname (FK) who are not indexed
CREATE TABLE INDEX_TBD AS
select distinct
     user_cons_columns.TABLE_NAME,
     user_cons_columns.COLUMN_NAME
from
     user_cons_columns,
     user_constraints,
     INDEX_TXT_TBD,
where
     user_constraints.CONSTRAINT_NAME=user_cons_columns.CONSTRAINT_NAME
     and CONSTRAINT_TYPE='R'
     AND INSTR(TXT,'"' || user_cons_columns.TABLE_NAME || '" ("' || user_cons_columns.COLUMN_NAME || '")') = 0