6.2 Data Integrity

3 of 3 objectives have lessons · 0 studied · 0 secure

Lessons

Validation and verification: two different guardsValidation stops data that is not acceptable; verification checks the data really is what was intended. 8 min, not started
Seven validation checks, and when to use eachRange, length, format, presence, existence, limit and check digit — what each one tests, and how to choose the right one for a field. 9 min, not started
Check digits: a built-in arithmetic guardCalculate a check digit, use it to test a code, and see why a single mistyped digit almost always shows up. 9 min, not started
Verification at entry: visual checks and double entryTwo ways to confirm that typed data matches the source, what each costs, and when each is worth it. 8 min, not started
Verification in transit: parity bits, block parity and checksumsHow a parity bit, a block check character and a checksum detect data corrupted while it travels, and what each one misses. 9 min, not started

3 objectives

What Cambridge says you should be able to do, in our words. Codes are the topic number plus the objective’s position.

6.2.1

Describe how data validation and data verification help to protect the integrity of data.

Taught in: Validation and verification: two different guards · 6 questions

6.2.2

Describe and use methods of data validation.

Including range check, format check, length check, presence check, existence check, limit check and check digit.

Taught in: Check digits: a built-in arithmetic guard, Seven validation checks, and when to use each · 13 questions

6.2.3

Describe and use methods of data verification during data entry and data transfer.

During data entry, including visual check and double entry. During data transfer, including parity check (byte and block) and checksum.

Taught in: Verification at entry: visual checks and double entry, Verification in transit: parity bits, block parity and checksums · 13 questions