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This video describes how IMS handles or reacts to long locks. IMS lock timeout capability is related in concept to the IRLM TIMEOUT value. The IRLM TIMEOUT value…
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This video looks at when there are situations where requests for locks related to resource management are not immediately satisfied but are not deadlocked, and the lock…
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This video provides an overview of the deadlock process, which is what happens when two or more requestors are waiting on each other.
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This video describes cost and benefits of physical versus virtual bidirectional pairing. The video also describes what changes are required if you convert virtual…
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This video describes what conversions are possible and costs to doing such conversions.
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This video describes when you might change pointer types, segment layouts, and database structures.
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This 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,…
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This video describes performance design considerations as discussed in previous videos for both physical and virtual implementations.
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This video describes In general, application programs are coded to expect there to be sequence fields. However, if applications don’t require them, avoid the…
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This video looks at the pointer selection process and the content of logical child segments depending on the choice selected for LP pointers.
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This video compares the main differences between physical and virtual bidirectional pairing.
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This video reviews the different types of IMS logical relationships and physical implementation rules.
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The 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…
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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…
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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…
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