Peter Ramm's Oracle performance analysis stuff

Panorama is my free performance analysis tool for Oracle-DB. From now it offers it's own database workload recording 'Panorama-Sampler' as alternative to use of Oracle's origin AWR and ASH data. This enables you to use Panorama's functions for evaluation of historic workload info: with any database edition including Standard Edition without licensing of Diagnostics Pack for Enterprise Edition In addition to Oracle's AWR Panorama-Sampler may also record historic information for: Size evolution of tablespace objects Usage of DB-cache by objects Detailed info for blocking lock scenarios You may find more about Panorama and it's sampling feature including download link at: http://rammpeter.github.io/panorama_sampler.html http://rammpeter.github.io/panorama.html

A common pitfall while using sequences in Oracle-DB is forgetting to define sequence caching. The default for sequences is cache size = 0. That means, every sequence.nextval operation triggers a single write operation on dictionary table sys.SEQ$. Especially if frequently calling sequence.nextval uncached sequences may cause significant performance degradation. Frequently calling sequence.nextval in parallel sessions may lead to ramdom lock scenarios in library cache. Setting a cache size for a sequence may heavy increase performance of nextval-operations. There's a minimal memory overhead for caching a sequence because all that's needed is a counter to increase in SGA memory and a upper limit. If this limit is reached with the counter, the upper limit is increased by cache size and the new upper limit is written down once to SEQ$. The possible drawback for sequence caching is that you loose all your values between the current value and the highest cached value if yo