Oracle 12c: SQL
3rd Edition
ISBN: 9781305251038
Author: Joan Casteel
Publisher: Cengage Learning
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Which of the following commands can you use to modify an index?a. ALTER SESSIONb. ALTER TABLEc. MODIFY INDEXd. ALTER INDEXe. none of the above
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If you have not yet used the COMMIT command to store the changes permanently in the database, you can restore the database to its previous condition with the ROLLBACK command.
Select one:
a. True
b. False
What can be referenced to determine whether an index is used to perform a query?a. USER_INDEXES viewb. query source codec. explain pland. database access plan
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- Which of the following data dictionary objects should be used to view information about the constraints in a database? USER_TABLES USER_RULES USER_COLUMNS USER_CONSTRAINTS None of the above objects should be used.arrow_forwardDoes the DBMS or the user make the choice of which index to use to accomplish a given task?arrow_forwardHow do you create an index? How do you create a unique index? What is the difference between an index and a unique index?arrow_forward
- One way to secure a database is to allow only administrators to have access to create and delete tables. (513)arrow_forwardWhat is the maximum number of records that can be modified with a single UPDATE command? 1 2 3 unlimitedarrow_forwardWhich of the following data dictionary objects should be used to view information about the constraints in a database? ( refer to the tables in the JustLee Books database). a. USER_TABLES b. USER_RULES c. USER_COLUMNS d. USER_CONSTRAINTS e. None of the above objects should be usedarrow_forward
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