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Db2 for z/OS: Monitoring & Tuning Applications' Performance
- Categories:
- Data and Office Applications Software and DevOps
- Code:
- TPDPTA
Overview
Prerequisites
A sound understanding of Db2 and z/OS concepts is required.What's included
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Hands-on, instructor-led training delivered in a QA learning centre
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What's included?
3 Days instructor led course
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Find out more about the course:
Learning outcomes
- plan for application monitoring and tuning
- identify database design factors that affect performance
- identify application design factors that affect performance
- use EXPLAIN as a first step towards performance tuning
- use Db2 traces to identify problem areas and identify tuning opportunities.
Course outline
What is 'performance'?; Performance objectives; Workload categories; Service Level Agreements; Performance factors; System parameters; EDM pool size; Buffer pool sizes; Bufferpool thresholds; Bufferpool development; Database design factors; Application design factors; Db2 traces.
Db2 TracesTrace types; Trace destination; Accounting trace classes; Audit trace classes; Statistics trace classes; Performance trace classes; Monitor trace classes; Global trace classes; IFCID types; Other trace options; Controlling traces.
Db2 Optimizer & Access Path SelectionDb2 optimiser; Access path selection; Access paths - index usage; Access paths - direct row access; Access paths - matching index access; Access paths - non-matching index access; Access paths - table(space) scan; Input to the optimiser; Filter factors; Filter factor and: clustering, column cardinality, column correlation, column distribution; Influencing the optimiser; Influencing the optimiser: manually adjusting statistics, using optimisation hints, modelling production values; Catalog statistics; Updating catalog statistics using RUNSTATS; Statistics columns; RUNSTATS examples.
Db2 EXPLAINEXPLAIN; PLAN_TABLE; DSN_STATEMNT_TABLE; DSN_FUNCTION_TABLE; EXPLAIN examples: Access paths, Multi-index access, Nested queries.
Database Design FactorsNormalisation forms; De-normalisation considerations; Table creation; Null attributes; Variable length columns; Column considerations; Constraint and domain management; Tablespace considerations; Space allocation and free space; Work file considerations; Data set placement; Index structure; Creating indexes; When and when not to index; Indexes and clustering; non-key columns in unique indexes; Composite keys; Reorganising indexes.
Application Design FactorsPredicates; Access paths; Indexable and non-indexable predicates; SQL statement processing; Stage 1 and stage 2 predicates; Summary of predicate processing; Predicate evaluation sequence; Sequential prefetch; List prefetch; Index lookaside; Joins; Join transformation; Join method; Subqueries; Non-correlated vs. correlated subqueries; UNION; Case expressions; Union and case performance; Table expressions; Temporary tables; Table comparisons.
Locking & ConcurrencyLocking overview; Reasons for locking; Lock compatibility - row and page locks; Lock compatibility - table and tablespace locks; Bind - ACQUIRE and RELEASE parameters; Bind - ISOLATION and CURRENTDATA parameters; Lock avoidance; Accessing currently committed data; Locking and concurrency recommendations.
Application Programs versus Db2 UtilitiesLoading data; Online LOAD; Deleting data; Unloading data using the REORG utility; Unloading data using the UNLOAD utility; UNLOAD utility restrictions; Dynamic SQL in utility statements.
Monitoring Application PerformanceMonitoring overview; Db2 Performance Expert; Db2PE reports and traces; accounting short report; accounting long report; time distribution reports; times, suspensions & highlights report; SQL activity report; dynamic SQL caching report; other processing activity report; locking activity report; parallelism report; buffer pool and group buffer pool activity reports; statistics long report.
Performance AnalysisEXPLAIN information; Db2PM reports; short accounting reports; long accounting reports; report usage summary; a general approach to problem analysis in Db2.
Good to know
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