Using Caché Multi-Dimensional Storage - InterSystems ...

3.9 Sorting Data within Globals ................................................................................... 25
3.9.1 Collation of Global Nodes ............................................................................ 26
3.9.2 Numeric and String-valued Subscripts ......................................................... 27
3.9.3 The $SORTBEGIN and $SORTEND Functions .......................................... 27
3.10 Using Indirection with Globals ............................................................................ 28
3.11 Managing Transactions ........................................................................................ 29
3.11.1 Locks and Transactions .............................................................................. 30
3.11.2 Nested Calls to TSTART ............................................................................ 31
3.12 Managing Concurrency ........................................................................................ 32
3.13 Most Recent Global Reference ............................................................................ 32
3.13.1 Naked Global Reference ............................................................................. 32
4 SQL and Object Use of Multidimensional Storage .................................................... 35
4.1 Data ........................................................................................................................ 35
4.1.1 Default Structure .......................................................................................... 35
4.1.2 IDKEY .......................................................................................................... 36
4.1.3 Subclasses ..................................................................................................... 37
4.1.4 Parent-Child Relationships ........................................................................... 38
4.1.5 Embedded Objects ........................................................................................ 39
4.1.6 Streams ......................................................................................................... 40
4.2 Indices .................................................................................................................... 40
4.2.1 Storage Structure of Standard Indices .......................................................... 40
4.3 Bitmap Indices ....................................................................................................... 41
4.3.1 Logical Operation of Bitmap Indices ........................................................... 41
4.3.2 Storage Structure of Bitmap Indices ............................................................ 43
4.3.3 Direct Access of Bitmap Indices .................................................................. 44
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Using Caché Multi-Dimensional Storage