2017/2018 NECO Data Processing Answer

OBJ

1-10:  DEEBDCCCAA
11-20: BBBAAADEAB
21-30: EDCDADBAEA
31-40: ABCBDADBDB
41-50: DBBEEBDCBA
51-60: AADBCACCDB


3a) software that handles the storage, retrieval, and updating of data in a computer system.

3aii)
MySQL
Microsoft Access

3bi) Normalization is a process of organizing the data in database to avoid data redundancy, insertion anomaly , update anomaly & deletion anomaly

3Bii)
 ---Insertion Anomalies:Insertion anomalies occur when we try to insert data into a flawed table.

---Deletion Anomalies:- Deletion anomalies occur when we delete data from a flawed schema.

---Update Anomalies:- Update anomalies occur when we change data in a flawed schema. 3c. Pick tool Shape tool Zoom tool Freehand tool

4b)
Log files - A log file is a recording of everything that goes in and out of a particular server.

Firewall- A firewall is a system designed to prevent unauthorized access to or from a private network.

Encryption - Encryption is the conversion of electronic data into another form, called ciphertext, which cannot be easily understood by anyone except authorized parties.

Backup- backup refers to the copying and archiving of computer data so it may be used to restore the original after a data loss event.

4ci)
Primary key uniquely identify a record in the table. While,
Foreign key is a field in the table that is primary key in another table.

Primary Key can't accept null values. While,
Foreign key can accept multiple null value.

4cii) Vision problems
Headache
Obesity


5a)
i)Transmission is the act of transferring something from one spot to another, like a radio or TV broadcast, or a disease going from one person to another.



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