Help with indexes

Question

1. Provide the SQL to create a bitmap index on a column named survey_vals in a table named results.
2. Describe the overall characteristics of the data in the survey_vals column. (In other words, why is the data in this column a good candidate for a bit-mapped index)
3. Provide the SQL to create a function-based index on a column called lastname in a table named authors.
4. Provide an example of a query that would justify the use of a function-based index that you created in number 3.
5. Provide the SQL to create a sequence named yourname_cmis420 that starts with 50,000 and has a maximum value of 100,000.
Once you have completed these exercises, save the file as yourname_indexes.sql and submit via the assignments folder by the due date.

Answer 1

submit via the assignments folder by the due dateDon't know if its before or after due date, but...
1).
SQL> create table results (survey_vals varchar2(10)) ;
Table created.
SQL> create bitmap index idx_results_survey_vals on results(survey_vals) ;
Index created.
SQL>2). without having the DDLs of the objects involved and the type of queries that will be asked from this table, it will be hard to tell.
3).
SQL> create table authors (lastname varchar2(50)) ;
Table created.
SQL> create index idx_authors_lastname on authors(upper(lastname)) ;
Index created.
SQL>4). Could be used for case-insensitive queries.
5).
SQL> create sequence yourname_cmis420 start with 50000 maxvalue 100000 ;
Sequence created.
SQL>