Operaciones Con Datos

Operations on files
A file can be accessed by a program running batch (batch mode) or by a program that run interactively.
With the access per batch, the transactions can usually be ordered toimprove access to the master file, whereas with interactive access transactions are processed as they arrive.

In batch mode access performance is measured by the number of transactions processed in aperiod. With interactive access, performance is measured by the response time to individual transactions.
The basic operations that run on the files are:
1. - Creation
2. - Update, including:
•Inserting records
• Modification Records
• Deleting Records
3. - Recovery, including:
• Consultation
• Generation of report.
4. - Maintenance, including
• Structuring
• ReorganizationCreating a File
Also known as the files upload. The great work in the creation of transaction files and master files include data capture and validation. In many cases, data is loaded into a transactionfile or master file batch, even if the file really is built record by record.
For example, nominates master file represents the current state of the status of the nominates of a campaign, such asmonthly and annual fields to indicate the date that payment amounts accumulated, vacations taken, salary assigned to each employee, and so on.

Updating a file
Change the contents of a master file toreflect a more current transitional moment in the real world is what is called "update" file. Inside of these changes may include: the insertion of new records, changing data records that already existin the file and the removal or elimination of archival records.
For example: Change the employee's salary, change indicative of employee status from active to inactive, and so on.

Retrievinginformation from a file.
Access a file in order to extract meaningful information is called "recovery" of information. There are basically two kinds of information retrieval: Consultation and report...