July 2011
Intermediate to advanced
516 pages
14h 50m
English
book
Expert PL/SQL Practices for Oracle Developers and DBAs
by John Beresniewicz, Adrian Billington, Martin Büchi, Melanie Caffrey, Ron Crisco, Lewis Cunningham, Dominic Delmolino, Sue Harper, Torben Holm, Connor McDonald, Arup Nanda, Stephan Petit, Michael Rosenblum, Robyn Sands, Riyaj Shamsudeen
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C H A P T E R 15
Dependencies and Invalidations
Dependencies between PL/SQL packages can a perplexing source of application errors. Database administrators and developers unacquainted with how dependencies work can find themselves scratching their heads over sporadic and unrepeatable errors that are seemingly without cause. For example, while executing a procedure in a package you are responsible for, an application throws the following error:
ORA-04068: existing state of package has been discarded
This particular procedure has been executed a million times before. You can swear on your great grandmother's grave that you haven't changed the package in a long time, definitely not in the last few seconds and yet the application ...