Search for tag: "ims"
Unit 9, Section 17: Physical and Virtual Pairing SummaryThis video summarizes the processing of physical and virtual pairing. It also reviews the performance issues and recommendations for physical and virtual pairing. |
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Unit 9, Section 16: Deletes with Virtual PairingThis video describes how you can improve the performance when executing DLET calls with virtual pairing. |
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Unit 9, Section 15: DLET LINEITEM: Bidirectional Virutal PairingThis video describes the processing that occurs with a DLET call in bidirectional virtual pairing. |
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Unit 9, Section 14: DLET LINEITEM: Bidirectional Physical PairingThis video describes the processing that occurs with a DLET call in bidirectional physical pairing. |
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Unit 9, Section 13: REPL LINEITEM: Bidirectional Virtual PairingThis video describes the processing that IMS must perform to execute a Dl/I GHx calls followed by a REPL call for a logical child segment when bidirectional virtual pairing is used for the logical… |
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Unit 9, Section 12: REPL LINEITEM: Bidirectional Physical PairingThis video describes replace calls for a logical child segments with physical pairing that result in the paired segments in both logically related databases being updated. |
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Unit 9, Section 11: GNP LINEITEM: Bidirectional Virtual PairingThis video describes a get next parent call accessing a virtual logical child in a bidirectional virtual pairing relationship, which is much more complex from a pointer-chasing and I/O standpoint… |
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Unit 9, Section 10: GNP LINEITEM: Bidirectional Physical PairingThis video describes a get next parent call accessing a real logical child, which is not conceptually complex. Although we are illustrating accessing a logical child with bidirectional physical… |
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Unit 9, Section 9: ISRT LINEITEM: Bidirectional Virtual PairingThis video describes the processing that must be performed when inserting a new LINEITEM virtual logical child segment with a LPCK of PROD2MOD2 into a database when bidirectional physical pairing is… |
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Unit 9, Section 8: ISRT LINEITEM: Bidirectional Physical PairingThis video describes the processing that must be performed when inserting a new LINEITEM real logical child segment with a LPCK of PROD2MOD2 into a database when bidirectional physical pairing is… |
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Unit 9, Section 7: Logical Parent SelectionThis video provides a summary that matches functional and performance requirements with the recommended pointer implementations of symbolic pointers, direct pointers, or both. |
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Unit 9, Section 6: Unidirectional Logical Relationships with Symbolic and Direct Logical Parent PointersStoring both symbolic and direct pointers in the logical child is almost always the best choice for performance. This approach eliminates the need for any I/Os in order to build the LPCK. A major… |
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Unit 9, Section 5: Unidirectional Direct Logical Parent Pointer, Part 2With direct pointers, the number of I/Os and CPU time required to access any individual logical parent is usually minimized. DL/I can directly access the exact location in the CI/block that contains… |
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Unit 9, Section 4: Unidirectional Direct Logical Parent Pointer, Part 1This video starts the discussion of direct logical parent pointers and what advantages and disadvantages they have. |
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Unit 9, Section 3: Unidirectional Symbolic Logical Parent Pointer, Part 2This video continues the discussion of logical parent pointers, specifically, that the main advantage for symbolic pointers is that their use permits logical relationships with HISAM. Direct LP… |
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Unit 9, Section 2: Unidirectional Symbolic Logical Parent Pointer, Part 1This video starts the discussion about symbolic logical parent (LP) pointers. When symbolic LP pointers are used, additional I/Os are almost always required when compared to direct LP pointers. If… |