RDBMS and Database - Python Program - DBM Database or Shelve - SSN - IT Assessment Answer

Assessment Task:

RDBMS and Database IT Assessment Answer

Queries

Each of the following queries should be implemented as separate programs. For queries that use an index, write two separate programs - one to build the index, and one to use the index to run the query.

In each case, test your program using small.bin first to verify that it works correctly before attempting the query on large.bin.

Use the UNIX time command to measure how long each query takes, and include the results in your submission.

Tip: based on the time you measure for small.bin, you may want to do a back-of-the-envelope estimate before starting queries on large.bin.

Query 1 - Table scan
Read the file block-by-block, list the SSN, first name, and last name of all users under age 21.

Query 2 - Uniqueness check
The SSN is supposed to be a unique identifier, but it was not declared UNIQUE above. Read the file block-by-block, using a DBM database to check whether the SSN has been seen before. Report any duplicates.

Query 3 - Secondary index
Use a DBM database to create a secondary index on birthdate, then loop through all items in the index to find the location on disk of all users under age 21. Read only the relevant disk blocks in order to list the SSN, first name, and last name of all users under age 21.

Query 4 - Clustered index
Create a clustered index on birthdate by sorting the data file and creating sparse DBM index entries for each disk block. Use this index to repeat the previous query.

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