Db2 for z/OS: Application Programming - Advanced Topics Training

  • Learn via: Classroom / Virtual Classroom / Online
  • Duration: 3 Days
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  • We can host this training at your preferred location. Contact us!

This course is designed for the experienced Db2 developer, focusing on advanced SQL statements and options. Additionally, the Db2 EXPLAIN facility is discussed as a tool to be used when choosing amongst competing SQL and design alternatives.<br><br>This course is available for one-company, on-site presentations and for live presentation over the Internet, via the Virtual Classroom Environment service.

Attendance on the course Db2 for z/OS Application Programming Workshop, or equivalent experience.

  • choose optimal SQL code
  • understand the Db2 Optimizer and the use of EXPLAIN in determining access path and statement efficiency
  • understand the differences between views, nested table expressions, common table expressions, and temporary tables and select the best option for a specific task
  • understand the use of materialized query tables, clone tables and temporal tables and the SQL statements associated with them
  • describe the use of distinct data types, user-defined functions, and OLAP functions
  • understand how and when triggers may be used
  • explain the advanced programming possibilities when using the INSERT, UPDATE, DELETE and MERGE statements
  • understand the difference between, and use of, identity columns and sequences.

Predicates, Access Paths, & I/O Types

Predicates; Access paths - matching index scan; Access paths - non-matching index scan; Access paths - table or tablespace scan; Access paths - direct row access; Indexable and non-indexable predicates; Predicate processing; Stage 1 and Stage 2 predicates; Summary of predicate processing; Predicate evaluation sequence; Sequential prefetch; List prefetch; Index lookaside.

The Db2 Optimizer

Input to the Optimizer; Catalog statistics; Filter factors; Filter factor and clustering; Filter factor examples; Influencing the Optimizer; Influencing the Optimizer by manually adjusting statistics, modelling production values & using optimization hints'; Catalog statistics; RUNSTATS options; Statistics columns; RUNSTATS - examples.

Db2 EXPLAIN

EXPLAIN; PLAN_TABLE; PLAN_TABLE additions; DSN_STATEMNT_TABLE; DSN_FUNCTION_TABLE; EXPLAIN: basic access paths, multi-index access, nested queries examples.

Views & Temporary Tables

Views; Nested table expressions; Common table expressions; Recursive SQL; View options; Created temporary tables; Declared temporary tables; Table comparisons.

Specialised Table Types

Materialized query tables; maintaining data in MQTs; Using MQTs; Automatic Query Rewrite (AQR); Clone tables; Using clone tables; Exchanging data; System period temporal tables; Application period temporal tables; Using temporal tables; FROM period specification.

User-defined Functions

User-defined functions; User-defined function types; Sourced user-defined function; External user-defined scalar function; External user-defined table functions; User-defined SQL scalar functions; User-defined SQL scalar functions; User-defined SQL table functions; Identifying functions; Invoking functions; Function resolution; Function Security; Controlling User Defined Functions.

Ranking & Grouping Data

Ranking data; ROW_NUMBER; RANK; DENSE_RANK; Moving sums; Moving averages.

Triggers

Triggers; Trigger components; Trigger options; Trigger body statements; BEFORE, AFTER & IINSTEAD OF triggers; Trigger examples; Trigger performance.

Advanced Data Manipulation Language

SELECT FROM INSERT/UPDATE/DELETE; INCLUDE with INSERT & UPDATE; Multi-row processing with INSERT & MERGE; Multi-row condition handling; GET DIAGNOSTICS; Statement information; Condition information.

Identity Columns & Sequences

Identity columns; Sequences; Changing attributes; Using identity columns & sequences in SQL statements.



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