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This video describes the beginning of the PRINT of the first DATA-containing CI.
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This video describes the second CI of the ESDS main database data set.
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This video describes the items in the first page of a VSAM PRINT for the database data set that corresponds to the first CI of the HIDAM primary index which is a VSAM KSDS data set.
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This video some items that should help you VSAM PRINTs, by providing a hexadecimal to decimal conversion table, VSAM’s numbering system, and how to find answers about HIDAM space usage.
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This video describes the sequence in which various pointer types exist in the prefix of IMS segments.
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This video describes how changes to the database hierarchic structure will require some database tool (such as IBM’s IMS Tools DB Segment Restructure), or a combination of standard utilities…
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This video describes the impacts of changing database segments. Existing application programs need not be affected by adding new segments. Existing programs can process without even being aware that…
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This video describes the impacts of making database changes, including what actions have no or little impact on application processing.
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This video describes the following design considerations:Why you should validate your database design with some performance measurements Why you never specify a pointer that will never be used but…
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The root segments of all database types, except for HDAM, require that a unique sequence field be defined. If no sequence field is defined for other (that is, non-root) segment types, IMS relies on…
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This video describes physical child pointers, physical twin pointers, and secondary index pointers.
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This lab demo continues the discussion of IMS database backup and recovery utilities.
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This lab demo shows you how to: Use the Database Image Copy utility and prepare JCL and utility control statements to run it Use the DB Change Accumulation utility and prepare the JCL and utility…
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This video describes the JCL used to start the Recovery Control utility and Database Recovery Control (DBRC), which does two main tasks:Maintains an inventory of the status of system logs (e.g. OLDS,…
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The Database Backout utility does this tasks:Removes database changes made during the execution of a DLI or DBB region Should also be used to backout database changes made by a BMP or MPP region…
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This video describes various recovery considerations such as:What frequency of image copy and change accumulation depends on. An image copy should be taken after a reorganization, database load, or…
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