Search for tag: "en-us"
Unit 11, Section 8: Virtual Pairing to Physical Pairing ConversionThis video describes what conversions are possible and costs to doing such conversions. |
|
Unit 11, Section 7: Changing Pointers, Segments, and Database StructuresThis video describes when you might change pointer types, segment layouts, and database structures. |
|
Unit 11, Section 6: Reasons to Change DatabasesThis video looks at reasons to change and not to change database types. For example, you might change databases if new functions are required by an application. However, you likely don’t need… |
|
Unit 11, Section 5: Physical versus Virtual Implementation Design SummaryThis video describes performance design considerations as discussed in previous videos for both physical and virtual implementations. |
|
Unit 11, Section 4: Sequence Field ConsiderationsThis video describes In general, application programs are coded to expect there to be sequence fields. However, if applications don’t require them, avoid the use of sequence fields… |
|
Unit 11, Section 3: Pointer SelectionThis video looks at the pointer selection process and the content of logical child segments depending on the choice selected for LP pointers. |
|
Unit 11, Section 2: Physical versus Virtual PairingThis video compares the main differences between physical and virtual bidirectional pairing. |
|
Unit 11, Section 1: Physical Implementation and Alternatives and RulesThis video reviews the different types of IMS logical relationships and physical implementation rules. |
|
Unit 10, Section 17: DL/I Call Image TraceThe DL/I call Image Trace is useful for performance and regression testing. When activated, it will capture the calls executed by an IMS application program to some data set and optionally format… |
|
Unit 10, Section 16: High Speed Sequential Retrieve (HSSR)Similar to PSSR, using HSSR is not specific to databases with logical relationships. Its purpose is to optimize sequential access of a database, including those with logical relationships, by… |
|
Unit 10, Section 15: HDAM Physical Sequence Sort/Reload (PSSR)PSSR is not really a logical relationship-specific tool. For HDAM or PHDAM databases, HD Programs, such as the HD Unload Utility or HP Unload, will sequence roots and their dependent segments, in… |
|
Unit 10, Section 14: IMS High Performance LoadSimilar to the Pointer Checker tool, High Performance Load is an add-on cost tool available from IBM for which other vendors provide similar functionality. The High Performance Load tool can reload… |
|
Unit 10, Section 13: Database Scan UtilityGenerally, the Database Scan utility’s performance characteristics are like HD Unload: both utilities read databases in a block-by-block manner and periodically need to re-read blocks that have… |
|
Unit 10, Section 12: Prefix Resolution and UpdateThis video looks at both prefix resolution and updates. Prefix resolution mostly involves sorting input work files. Because of this, it can be tuned in the same way as tuning is performed for any… |
|
Unit 10, Section 11: HD Unload and ReloadThis video describes how HD unload and reload, specifically adding or removing buffers can help or hurt database performance. |
|
Unit 10, Section 10: HD Pointer Checker ReportsThis video describes the following types of reports:PROCCTL Statements Interval Statistics Segment and Pointer Statistics HD Tuning Statistics |