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Filed under: Infrastructure,Oracle,Troubleshooting,Upgrades — Jonathan Lewis @ 8:58 pm GMT Mar 20,2011 (The title’s a pun, by the way – an English form of humour that is not considered good unless it’s really bad.) Very few people try to email me or call me with private problems – which is the way it should be, and I am grateful to my audience for realizing that this blog isn’t trying to compete w
If you’re running a version of Oracle older than 10g (where v$active_session_history appeared), or if you’re not using Enterprise Edition, or if you just don’t want to pay for the Diagnostic Pack licence, here are some links relating a free Java program that emulates the “Top Sessions” output of the Enterprise Manager screen: http://timurakhmadeev.wordpress.com/2010/02/18/ash-viewer/ http://source
Filed under: CBO,Execution plans,Indexing,Infrastructure,NULL,Oracle,Transformations — Jonathan Lewis @ 5:56 pm BST Sep 5,2010 Here’s a little detail that I’ve known for years – but keep forgetting until I embarrass myself by rediscovering it (usually in front of a client). I’ll start with a demonstration of a useful little feature of mandatory columns: drop table t1 purge; create table t1 as sele
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