An user account is not a physical structure in Database but it is having important relationship to the objects in the database and will be having certain privileges. 95. When will the data in the snapshot log be used? - We must be able to create a after row trigger on table (i.e., it should be not be already available) After giving table privileges. We cannot specify snapshot log name because oracle uses the name of the master table in the name of the database objects that support its snapshot log. The master table name should be less than or equal to 23 characters. (The table name created will be MLOGS_tablename, and trigger name will be TLOGS name).

- Installing and upgrading the Oracle Server and application tools.

- Allocating system storage and planning future storage requirements for the database system.

- Managing primary database structures (tablespaces)

- Managing primary objects (table, views, indexes)

- Enrolling users and maintaining system security.

- Ensuring compliance with Oracle license agreement

- Controlling and monitoring user access to the database.

- Monitoring and optimizing the performance of the database.

- Planning for backup and recovery of database information.

- Maintain archived data on tape

- Backing up and restoring the database.

- Contacting Oracle Corporation for technical support.

SQL * DBA - This allows DBA to monitor and control an ORACLE database. SQL * Loader - It loads data from standard operating system files (Flat files) into ORACLE database tables. Export (EXP) and Import (imp) utilities allow you to move existing data in ORACLE format to and from ORACLE database.

To perform one of these function on an index, table, or cluster:

 - To collect statistics about object used by the optimizer and store them in the data dictionary. 

 - To delete statistics about the object used by object from the data dictionary.

 - To validate the structure of the object.

 - To identify migrated and chained rows off the table or cluster.

Group of tables physically stored together because they share common columns and are often used together is called Cluster.

A distributed database is a network of databases managed by multiple database servers that appears to a user as single logical database. The data of all databases in the distributed database can be simultaneously accessed and modified.

Use the DBMS_SESSION.SET_SQL_TRACE or

Use ALTER SESSION SET SQL_TRACE = TRUE;

ALTER INDEX <index_name> REBUILD;