Technical Interview Questions » DBA Interview Questions

How will you enforce security using stored procedures?

admin — Mon, 12 Mar 2007 21:05:21 +0000

Don’t grant user access directly to tables within the application. Instead grant the ability to access the procedures that access the tables. When procedure executed it will execute the privilege of procedures owner. Users cannot access tables except via the procedure.

What is a profile?

admin — Mon, 12 Mar 2007 21:04:58 +0000

Each database user is assigned a Profile that specifies limitations on various system resources available to the user.

What is a trace file and how is it created?

admin — Mon, 12 Mar 2007 21:04:36 +0000

Each server and background process can write an associated trace file. When an internal error is detected by a process or user process, it dumps information about the error to its trace. This can be used for tuning the database.

What are the responsibilities of a Database Administrator?

admin — Mon, 12 Mar 2007 21:04:16 +0000

* 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.

What is Auditing?

admin — Mon, 12 Mar 2007 21:03:48 +0000

Monitoring of user access to aid in the investigation of database use.

What is Object Auditing?

admin — Mon, 12 Mar 2007 21:02:40 +0000

Object auditing is the auditing of accesses to specific schema objects without regard to user.

What is Privilege Auditing?

admin — Mon, 12 Mar 2007 21:02:21 +0000

Privilege auditing is the auditing of the use of powerful system privileges without regard to specifically named objects.

What are the use of Roles?

admin — Mon, 12 Mar 2007 21:02:02 +0000

REDUCED GRANTING OF PRIVILEGES -

Rather than explicitly granting the same set of privileges to many users a database administrator can grant the privileges for a group of related users granted to a role and then grant only the role to each member of the group.

DYNAMIC PRIVILEGE MANAGEMENT -

When the privileges of a group must change, only the privileges of the role need to be modified. The security domains of all users granted the group’s role automatically reflect the changes made to the role.

SELECTIVE AVAILABILITY OF PRIVILEGES -

The roles granted to a user can be selectively enable (available for use) or disabled (not available for use). This allows specific control of a user’s privileges in any given situation. APPLICATION AWARENESS - A database application can be designed to automatically enable and disable selective roles when a user attempts to use the application.

What are Roles?

admin — Mon, 12 Mar 2007 21:01:00 +0000

Roles are named groups of related privileges that are granted to users or other roles.

What are roles?How can we implement roles?

admin — Mon, 12 Mar 2007 21:00:41 +0000

Roles are the easiest way to grant and manage common privileges needed by different groups of database users. Creating roles and assigning provides to roles. Assign each role to group of users. This will simplify the job of assigning privileges to individual users.