exp Name Entry

1.3.6.1.4.1.9.10.22.1.2.3.1

Information about a single expression. New expressions can be created using expNameStatus. To create an expression first create the named entry in this table. Then use expExpressionIndex to populate expExpressionTable and expObjectTable. For expression evaluation to succeed all related entries in expNameTable, expExpressionTable, and expObjectTable must be 'active'. If these conditions are not met the corresponding values in expValue simply are not instantiated. Deleting an entry deletes all related entries in expExpressionTable and expObjectTable. Because of the relationships among the multiple tables for an expression (expNameTable, expExpressionTable, expObjectTable, and expValueTable) and the SNMP rules for independence in setting object values, it is necessary to do final error checking when an expression is evaluated, that is, when one of its instances in expValueTable is read. Earlier checking need not be done and an implementation may not impose any ordering on the creation of objects related to an expression other than to require values for expName and expExpressionIndex before any other related objects can be created. To maintain security of MIB information, when creating a new row in this table, the managed system must record the security credentials of the requester. If the subsequent expression includes objects with expObjectSampleType 'deltaValue' the evaluation of that expression takes place under the security credentials of the creator of its expNameEntry.