Quiz no. 8

1. Define the term, database,and explain how a database interacts with data and information.

     A database is an organized collection of data for one or more purposes, usually in digital form. The data are typically organized to model relevant aspects of reality (for example, the availability of rooms in hotels), in a way that supports processes requiring this information (for example, finding a hotel with vacancies). The term "database" refers both to the way its users view it, and to the logical and physical materialization of its data, content, in files, computer memory, and computer data storage. This definition is very general, and is independent of the technology used. However, not every collection of data is a database; the term database implies that the data is managed to some level of quality (measured in terms of accuracy, availability, usability, and resilience) and this in turn often implies the use of a general-purpose Database management system (DBMS). A general-purpose DBMS is typically a complex software system that meets many usage requirements, and the databases that it maintains are often large and complex.
     The term database is correctly applied to the data and data structures, and not to the DBMS which is a software system used to manage the data. The structure of a database is generally too complex to be handled without its DBMS, and any attempt to do otherwise is very likely to result in database corruption. DBMSs are packaged as computer software products: well-known and highly utilized products include the Oracle DBMS, Access and SQL Server from Microsoft, DB2 from IBM and the Open source DBMS MySQL. Each such DBMS product currently supports many thousands of databases all over the world. The stored data in a database is not generally portable across different DBMS, but can inter-operate to some degree (while each DBMS type controls a database of its own database type) using standard like SQL and ODBC. A successful general-purpose DBMS is designed in such a way that it can satisfy as many different applications and application designers as possible. A DBMS also needs to provide effective run-time execution to properly support (e.g., in terms of performance, availability, and security) as many end-users (the database's application users) as needed. Sometimes the combination of a database and its respective DBMS is referred to as a Database system (DBS).

2.Describe file maintenace techniques (adding records,modifying records,deleting records) and validation techniques.

File Maintenance Techniques
 ›File maintenance refers to the procedures that keep data current. File maintenance procedures include adding records to correct inaccurate data or to update old data with new data, and deleting records when they no longer are needed.

Validation Techniques

 ›Validation is the process of comparing data with a set of rules or values to find out if the data is correct. Many programs perform a validity check that analyzes data, either as you enter it or after you enter it, to help ensure that it is correct.

›Types of validity checks include an alphabetic check, a numeric check, a range check, a consistency check, a completeness check, and a check digit.

3.Discuss the terms character,field,record,and file.

Character is a unit of information that roughly corresponds to a grapheme, grapheme-like unit, or symbol, such as in an alphabet or syllabary in the written form of a natural language.

Field is an open-source software project initiated by OpenEnded Group, for the creation of their digital artworks. It is an environment for writing code to rapidly and experimentally assemble and explore algorithmic systems. It is visual, it is hybrid, it is code-based. We think that it has something to offer a diverse range of programmers and artists.

Enter your data, and then press TAB to go to the next field.

To Edit a Record :

       You can change the data in one or more fields in a record. For example, if you want to correct the spelling of a customer name, you can open the Customers form in Form view, move to the record that corresponds to the customer, and edit the Name field in the form. When you move to a different  record, Access will automatically update the field in the underlying table.

1. Open the form (in Form view), page (in your Web browser or in Page view), or table (in Datasheet view) that has the record that you want to edit.
2. Move to the record by using the buttons on the navigation toolbar.
3. Use the mouse or the TAB or arrow keys to move to the field that you want to edit.

 To replace the entire contents of a field in a datasheet, click near the left edge of the field when the pointer turns to a plus, as shown in the following example. In a form, click the field's label.

To add to the existing contents of a field, place the insertion point where you want to enter the new characters. You can move the insertion point by using the arrow keys. In the following example, the insertion point is at the end of the current contents of the field, so anything that you type will be appended to the string "Alfreds FutterKiste".

4.Discuss the functions common to most database management systems:data dictionary, file retrieval and maintenance, data security, and backupand recovery.

  Enter your text in the field. If text in the field was selected before you started typing, the characters that you type will replace that text.

Delete a contents of a field or an entire record
You can delete the text in a field to either leave the field blank (if the field supports Null values), or to replace the text with another value. You can also permanently delete one or more records in a table:

• To delete text in a field, select the text and then press DEL.

For information on how to select a field, see Select fields and records.

• To delete one or more records in a datasheet or a form, select the records and then press DEL.
• To delete a record on a data access page, click the Delete button on the record navigation toolbar.

5. Differentiate between a file processing approach and the database approach.

• A database coordinates the physical and logical access to the data; a file-processing system only coordinates physical access to the data
• A DBMS reduces the amount of data duplication
• A DBMS is designed to allow flexibility in what queries give access to the data, where a file-processing system only allows pre-determined access to data (by specific compiled programs)
• A DBMS is designed to coordinate and permit multiple users to access data at the same time. A file processing system is much more restrictive in simultaneous data access.

6. Describe characteristics of relational, object-oriented, andmultidimensional databases.

Relational database-stores data in tables that consists of rows and columns. Each row has a primary key and each column has a unique name.

Object-oriented database (OODB) - stores data in objects;often use an object query language to manipulate and retrieve data.

Multidimensional databas-stores data in dimensions;allows users to access and analyze any view of the database data and no standard query language exists.

 

7.Explain how to access web databases.

 

A Web database links to a form on a Web page. To access data in a Web database, you fill on the form or enter search text on a Web page. A Web database usually resides on a database server, which is a computer that store and provides access to a database.

 

8.Define the term, computer security risks, and briefly describe the typeof cybercrime perpetrators: hacker, cracker, script kiddie, corporate spy,unethical employee, cyberextortionist, and cyberterrorist.

 

Computer security is a branch of computer technology known as Information Security as applied to computers and networks. The objective of computer security includes protection of information and property from theft, corruption, or natural disaster, while allowing the information and property to remain accessible and productive to its intended users. 

 

Cybercrime Perpetrators

Hacker refers to a computer programmer who is able to create usable computer programs where none previously existed. 

Cracker is a variation of hacker , with the analogy equal to a safe cracker. Some individuals use the term cracker in an attempt to differentiate from the honorable computer programmer definition of hacker.

Script kiddy is an individual who executes computer scripts and programs written by others. Their motive is to hack a computer by using someone else’s software. Examples include password decryption programs and automated access utilities. Corporate Spy - have excellent computer and networking skills and are hired to break into a specific computer and steal its proprietary data and information.

Unethical employee - break into their employers' computer for a variety of reasons. Some simply want to exploit security weakness.

Cyberextortionist - is someone who uses e-mail as a vehicle for extortion. These perpetrator s send an organization a threatening e-mail message indicating they will expose confidential information, exploit a security flaw, or launch an attack that will compromise the organization s network - if they are not paid of a sum of money.

Cyber-terrorist - a programmer who breaks into computer systems in order to steal or change or destroy information as a form of cyber-terrorism.

 

9.Identify database design guidelines and discuss the responsibilities of database analysts and administrators.
Database Analysts and Database Administrators are responsible for managing and coordinating all database activities.

Database Analysts (DA) - focuses on the meaning and usage of data. The DA decides on the placement of fields, defines the relationships among data, and identifies user's access privilege.

Database Administrators (DBA) requires a more technical inside view of the data. The DBA creates and maintains the data dictionary, manages data security, monitors database performance, and checks backup and recovery procedures. 

 

10.Discuss techniques to prevent unauthorized computer access and use

Operating system and software patches and updates

There is no such thing as perfect software, often a software program may have several issues and could potentially have security vulnerabilities that can leave your computer open to attacks that compromise your computer and your data.

Software patches, updates, and drivers are made available, often for free, to consumers to help keep a software program and operating systems running properly and secure. If the program you're using does not have any method of checking for updates on its own it is up to you to verify the program is up-to-date. Often this can be done by visiting the web site of the developer who created the program. A listing of third-party companies and links to each of their pages can be found on our third-party support page.

• How to update a Microsoft Windows computer.

Passwords

Make sure a password has been set on computer. Default passwords such as password, root, admin or no password will allow easy access to your computer or your Internet account.

1. Change passwords often. It is recommended at least once every few months.
2. Create a BIOS password.
3. When creating a password, add numbers or other characters to the password to make it more difficult to guess; for example: 1mypassword23!.
4. Do not use sticky notes around your computer to write down passwords. Instead use a password manager.

• Complete information and links to information about computer passwords.

Get a hardware or software firewall

We highly recommend all computer users have a firewall solution. There are two ways a firewall can protect your computer and network.

1. Hardware firewall - A hardware firewall is a hardware device that is connected to your network. Often many home users who have a home network use their network router as a firewall solution.
2. Software firewall - A software firewall is a software program that you install on your computer that helps protect that computer from unauthorized incoming and outgoing data. Below is a listing of a few of the more widely used software firewall programs.

Agnitum Outpost Firewall
BlackICE PC Protection
Kerio Personal Firewall
Sygate Firewall
Tiny software Tiny Personal Firewall
Network Associates
Zone Labs Zone Alarm

Note: A software firewall is only going to protect the computer that has the firewall installed on it.

In addition to the above listed firewall software programs many of the antivirus scanners released today also include their own version of a firewall program. If you have an antivirus scanner that also has a firewall program you do not need to worry about getting one of the above programs or another third-party firewall program.

• How to enable or disable the Microsoft Windows firewall.

Trojans, viruses, spyware, and other malware

Software Trojans, viruses, spyware, and other malware can not only damage or destroy your computer data Internet or even log all your keystrokes to capture sensitive data such as passwords and credit card information. but is also capable of monitoring your computer to learn more about your viewing habits on the

To help protect your computer from these threats we suggest installing a virus protection program as well as a spyware protection program.

• What are the current available antivirus programs?
• My web browser has been hijacked.

Know how to handle e-mails

Today, e-mail is one of the most popular features on the Internet. Being able to identify threats sent through e-mail can help keep your computer and your personal information safe. Below are some of the most common threats you may encounter while using e-mail.

• Attachments - Never open or run e-mail attachments. Viruses, spyware, and other malware are commonly distributed through e-mails that have attachments. For example, an e-mail may want you to open an attachment of a funny video, when it's actually a virus.
• Phishing - Phishing or an e-mail phish is an e-mail that appears to be from an official company (such as your bank) indicating you need to log onto the site to check your account settings. However, the e-mails are actually sites setup to steal confidential information such as your passwords, credit card information, social security information, etc. See the phishing definition for additional information about this term as well as examples of these e-mails.

Alternative browser

Before the release of Microsoft Windows XP SP2 and Internet Explorer 7.0, Microsoft Internet Explorer was notorious for security and spyware related issues. Although it has improved since then we still highly recommend considering an alternative browser such as Mozilla Firefox.

Run system scans to check for vulnerabilities

There are several sites on the Internet that allow users to check their computers for potential threats or issues their network or computer may have that can allow users unauthorized access to their computer. Below are a listing of recommend sites to try: 

Gibson Research Corporation - The Gibson Research Corporation, or GRC, is a great location to learn about network security as well as well as test your computer or network for vulnerabilities.