ADS AND DIS OF USING APPLICATION PACKAGE• ADS

2. Ads and dis of using application package

• Ads:

- The packages can be used immediately

- Documentation is generally good

- It can be used on a varisty of machines

- It is cheaper as the costs of the packages are shared between many users

- Comprehensive on line help information and guided tutorials available

- Easily remembered command syntax

- Can be used in confunction with other software in an integrated fashion

• Dis:

- Modifications may be difficult for some applications

- Package may be two generalized to suit user needs

- Some features purchased may not be required

- Support given depends on stability and professionalison of the vendor

- User are required to comply with the owner’s regulations

Question 2. Utility software?

- Certain processing is common to a high proportion of computer users, and so

utility software has been created to cater for this need

- Utility software is intended to be sufficiently flexible to meet most user’s

requirements and is tailored to meet their precise needs by means of parameter

entered prior to use

- Some of the utility programs described below may be incorporated into the OS

that is used with a particular computer

 File conversion: this convers the transference of data from any

medium to any other

 File copying: an exact copy of a data set is made on to another lot

for the same type of storage medium

 File reorganisation: direct access, files over flow records are stored

in designed blocked, this is acceptable up to a point but from time

it si necessary to reorganise the file so as to remove the overflow

 File maintenance(amendment): this procedure involves the

straightforward insertion and deletion of records into or form

sequential files

 Sorting: is frequently necessary in order to arrange a set of records

into a certain sequence based on their key values

 Dumping routines: a dump routine is used in confunction with a

restfirt program ...

 House keeping operations: there are programs or parts of a

programs not directly concerned with the solution of the problem in

hand

 Trace routines: these entails, the dumping, display or printing of th

program or other contents of the main store during program testing

to facilitate error detection

- Utilitys are commonly used to perform these functions:

 Copying of files

 Sorting of data

 Merging of files

 Data recovery

 Reformating of records by reamanging their fields

 File reorganization

 Reporting of sys status and usages

Question 3. System software?

There are three main types of memory placement policy:

- First fit

- Best fit

- Worst fit