oracle dba
http://www.oracleblog.org/category/study-note/
https://jonathanlewis.wordpress.com/
http://www.juliandyke.com/Presentations/Presentations.html#AdvancedDiagnosticsRevisited
http://blog.tanelpoder.com/
https://alexanderanokhin.wordpress.com/2011/11/13/dynamic-tracing-of-oracle-logical-io/
