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- Question
Why SELECT * is not preferred in embedded SQL programs?
- Correct Answer
- - If the table structure is changed ( a field is added ), the program will have to be modified - Program might retrieve the columns which it might not use, leading on I/O over head - The chance of an index only scan is lost
- 1. What is meant by index cardinality? Discuss
- 2. How will u send data from a cobol file to db2 table? Discuss
- 3. What is a DB2 bind? Discuss
- 4. What is a DB2 plan? Discuss
- 5. My SQL statement SELECT AVG(SALARY) FROM EMP yields inaccurate results. Why? Discuss
- 6. When does the SQL statement gets executed when you use cursor in the application programming? Discuss
- 7. What is QUIESCE? Discuss
- 8. In terms of DB2 indexing, what is the root page? Discuss
- 9. In a DB2-CICS program which acts as co-ordinator and which is the participant? Discuss
- 10. What is CICS? Discuss
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Correct Answer: The number of distinct values for a column is called index cardinality DB2's RUNSTATS utility analyzes column value redundancy to determine whether to use a tablespace or index scan to search for data
Correct Answer: USING HOST VARIABLE we can pass data from COBOL to DB2
Correct Answer: A DB2 bind is a process that builds an access path to DB2 tables
Correct Answer: An application plan or package is generated by the bind to define an access path
Correct Answer: Because SALARY is not declared to have NULLs and the employees for whom the salary is not known are also counted
Correct Answer: SQL statement gets executed when we open cursor
Correct Answer: A QUIESCE flushes all DB2 buffers on to the disk This gives a correct snapshot of the database and should be used before and after any IMAGECOPY to maintain consistency
Correct Answer: The simplest DB2 index is the B-tree and the B-tree's top page is called the root page The root page entries represent the upper range limits of the index and are referenced first in a search
Correct Answer: DB2 acts as the participant and CICS acts as a co-ordinator
Correct Answer: Customer Information Control System (CICS) is an online transaction processing monitor from IBM that acts as an interface between the operating system and application programs to provide rapid high-volume online transaction processing
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