Ingres 9.2 Migration Guide - Actian

Changes to Existing FeaturesConfiguration Rules System EnhancementsThe Configuration Rules File System has been modified to handle negativevalues and decimal values.Shadow Copy of the Symbol TableWhen setting, unsetting, or changing environment variables, a backup of thesymbol.tbl file (symbol.bak) is maintained. If the original symbol.tbl filebecomes corrupted, you can use the backup symbol table file to restore it. Ahistory of updates to the symbol.tbl file is maintained in the symbol.log file.The symbol.bak and symbol.log files are located in the same location as theoriginal symbol.tbl file. For more information, see the System AdministratorGuide.Additional Join FunctionalityIn addition to inner, left, right, and full joins, users can request cross joins(effectively inner joins without an ON clause) and natural joins. Also, the ONclause can be replaced by a USING clause that contains a list of columns, eachof which appears in both tables being joined. Instead of the explicitly codedjoin qualification of the ON clause, the USING clause applies one equijoinpredicate for each column pair in the list of columns. For example, “… a leftjoin b using c1, c2 …” is identical to coding “… a left join b on a.c1 = b.c1 anda.c2 = b.c2 ….” For more information, see the SQL Reference Guide.Improved Out-of-the-Box Configuration DefaultsIngres configuration defaults have been updated to reflect the currenthardware environments.Improved IMA SupportIngres 2006 introduces an additional Ingres Management Architecture (IMA)component, IMP.IMA provides the framework for accessing system data for monitoring andmanaging installations through SQL without affecting the underlying operationof the product. For more information, see the System Administrator Guide.188 Migration Guide