IMS - the hierarchical Data Base Management System; Hierarchical terminology summary; Program Specification Block (PSB); PSB statements; PCB: PROCOPTs PSB generation; ACB generation; PSB / program relationships: Linkage Section Procedure (or Entry) statement, Batch JCL; DBD; Database macro function; DBD handling; Application definition macro function; PSB handling; Dynamic PSB option.
IMS DB HS & Hybrid Access MethodsDL/I organisations and access methods; Full-function organisations; Fastpath organisations; HISAM; Insertion; Deletion; HISAM database definition; Hybrid - SHISAM; Hybrid - GSAM.
IMS DB ImplementationStages; DFSDDLT0; Using DFSDDLT0; Status card; CALL cards; DATA card; Other cards; Examples of DFSDDLT0 control cards; CALL image capture.
HD Access MethodsHierarchical direct; Logical record; Free space; HIDAM; Characteristics; Available options; When to use; Database; Index; HIDAM database definition: HIDAM DBDs; The Index DBD; The Body DBD; HDAM; Characteristics; Available options; When to use; HDAM database definition; Space management for HIDAM and HDAM; Physical child pointers; Physical Child First; hysical Child First and Last; Physical twin pointers; Physical Twin Forward; Physical Twin Forward and Backward; No Twin Pointers; Hierarchic pointers; Pointers in HIDAM and HDAM; Prefix format.
Database Reorganisation UtilitiesReorganisation; Why reorganise?; Unload and reload; HISAM reorganisation; DFSURUL0; DFSURRL0; HD reorganisation; DFSURGU0; DFSURGL0.
Secondary IndexingSecondary indexing Pointer segment; Target segment; Source segment; Direct pointing; Symbolic pointing; Database DBD; Secondary Index Database DBD; PCB; SSA; Secondary data structure; Stand-alone processing; Restrictions; To process; Things to consider; Processing a secondary index; Secondary index DBDs; XDFLD statement; Target and Source; Secondary Data Structures; Independent AND in Boolean SSAs.
Logical RelationshipsLogical relationships; Unidirectional Logical Relationship; Bidirectional physically-paired logical relationship; Bidirectional virtually-paired logical relationship; Logical Parent Pointer; Logical Child Pointer; Logical Twin Pointer; Physical Parent Pointer; LCHILD statement; SEGM statement for Child; SEGM statement for Children; SEGM statement of Real Child; SEGM of Virtual Child; General rules; Logical databases; DBDs; Order (Physical); Item (Physical); OrderL (Logical); Bi-directional Physical pairing; Bi-directional Virtual pairing; Logical rules; Logical databases and utilities.
Further Database UtilitiesAdditional reorganisation utilities; Pre-Reorganisation Utility (DFSURPR0); Database Scan Utility (DFSURGS0); Prefix Resolution Utility (DFSURG10); Prefix Update Utility (DFSURGP0); Reorganisation with secondary index; Reorganisation with logical relationships.
IMS Data Base Recovery Control (DBRC)DBRC overview; RECON initialization and structure; RECON records; Maintaining the RECONs; Migrating RECONs to new release; Skeletal JCL; Log maintenance JCL; Entering commands online; Batch command support; Database registration; RECON maintenance; Problems; Database Recovery Control; DBRC log control; DBRC share control; DBRC database control; Database recovery; Overview of Parallel RECON Access.
Larger DatabasesProblem; Solutions; High Availability Large Data Base (HALDB); Logical relationships and secondary indexes are supported; PHDAM - partitioned HDAM; PHIDAM - partitioned HIDAM - Index is also partitioned; PSINDEX - partitioned secondary index; Hierarchic structure is maintained; Partition selection (deciding in which partition a record resides); Partitioning choices Logical DB considerations; The DFSHALDB control statement; HALDB self healing pointers; Partitioned Data Structure; HALDB data sets; What DBRC sees; Changing partition boundaries; HALDB online reorganisation; Data Entry Database (DEDB); Data Entry Database; Area; Data Entry Database; Area structure; Root Addressable Part; Independent Overflow Part; Sequential Dependent Part; Data Entry Database; Unit of work ; Logical Record; Data Entry Database - Sequential Dependent Segments; Data Entry Database - segment contents; Data Entry Database - subset pointers; Data Entry Database - POS call.
IMS Database IntegrityBackup and recovery; Logging; What events are logged?; Log data sets; Online Log Data Sets (OLDS); Write-Ahead Data Sets (WADS); System Log Data Sets (SLDS); Recovery Log Data Set (RLDS); Restart Data Set (RDS); Archiving; Automatic; Manual; Contents of the log; Sample Log record types; Backup; Image copy; Database Image Copy Utility (DFSUDMP0); Online Database Image Copy Utility (DFSUICP0); Fuzzy copying and log requirement; Image Copy Utility (DFSUDMT0); Change Accumulation; Change Accumulation Utility (DFSUCUM0); Database Recovery; Database Recovery Utility (DFSURDB0); Time stamp recovery.
Sharing Data & Data SharingSharing access - the problem; Sharing access - solutions; Control region / DLISAS; Program isolation; Locking; Database locking; What is locked?; Rules for locking; PROCOPT = GOx; PROCOPT = E; Deadlocks; Data Sharing - general; Database-level sharing; Block-level sharing.... z/OS; Block-level sharing....> z/OS.
IMS DB MonitoringPerformance; What factors affect performance?; DB performance (1); DB monitor; VSAM Buffer Pool Report; VSAM Statistics Report; Database Buffer Pool Report; Program I/O Report; DL/I Call Summary Report; DFSSTAT reports; IEHLIST utility; IDCAMS LISTCAT; Database surveyor utility; IMS Monitor Summary and System Analysis Program; DB tuning options; Program I/O report; Program summary report; Database buffer pool report; VSAM buffer pool report; Database failures; Write errors; Read errors 13.13 Examples.
New Uses for IMS DatabasesXML databases; Open Database Manager; IMS Connect and ODBM; Java DL/I Access.
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