By Curtis Garvin, Anne Prince
Designed in particular for COBOL programmers, DB2 for the COBOL Programmer, half 2 takes up the place Part 1 leaves off. half 1 covers the necessities had to write any COBOL application that handles DB2 facts. half 2 builds on that base to provide you complicated DB2 abilities, so that you can turn into a most sensible senior programmer or programmer/analyst on your store.
That capability you will research:
How to take advantage of saved techniques that movement SQL code off of the customer and onto the database server to lessen community overhead
How to exploit dynamic SQL so your courses can generate and execute SQL statements as they run
How facts sharing works at the parallel sysplex and different System/390 configurations
How to paintings with disbursed DB2 information
How to procedure DB2 info in CICS courses
Advanced locking innovations that convey how locking and knowledge sharing have an effect on one another and what influence that has on application potency
The ideas and practices of DB2 database management that permit the programmer layout databases, deal with database goals, and arrange a high quality insurance surroundings
Read Online or Download DB2 for the COBOL Programmer, Part 2 PDF
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Extra resources for DB2 for the COBOL Programmer, Part 2
Sample text
Actually, there are cases where tractability of CQA based on project-join repairs can be achieved while tuple-based repairs applied directly to the original instance lead to an intractable CQA problem (cf. Chapter 5). Some comparisons of different repair semantics can be found in [Lopatenko and Bertossi, 2007] and [Afrati and Kolaitis, 2009]. 5. However, all the semantics superficially described in this section will be revisited in Chapter 5. 1 RESIDUE-BASED REWRITING A first attempt to do query rewriting was proposed by Arenas et al.
Denial constraint violations can be solved only by tuple deletions, but inclusion dependency violations by both tuple deletions and 30 3. TRACTABLE CQA AND QUERY REWRITING insertions. However, Chomicki and Marcinkowski [2005] consider only tuple deletions for inclusion dependencies. With denial constraints we may have to generate an hypergraph instead of a graph. Consider the denial constraint, δ : ∀xyz¬(P (x, y) ∧ P (x, z) ∧ R(y, z)), and the inconsistent instance D = {P (a, b), P (a, c), P (e, f ), R(b, c), R(e, f )}.
First, consider the query Q1 (x) : R(x) about the tuples in the table for R. In this case, if a tuple belongs to R, say R(d) ∈ D, no violation can be produced wrt ϕ. So, we do not modify the atom in Q1 . Now, consider the query Q2 (x) : P (x) about the tuples in P . In this case, if a tuple belongs to P , say P (d) ∈ D, then that tuple is involved in a violation if R(d) ∈ / D. In consequence, for P (d) to be a consistent answer, R(d) should also be in D. Thus, we modify the query by adding this additional condition: Q2 (x) : P (x) ∧ R(x).