While I have published direction on how to read an AWR report, the Oracle AWR and STATSPACK report often contain undocumented references to internal kernel parameters:

I created the Ion for Oracle product to parse through the complexities of a AWR report and filter-out the important metrics, but these internal kernel parameters are not directly documented by Oracle.

Below are the common prefixes for the Oracle kernel subsystems and their purpose.

As we can see, the kcmgas subsystem relates to Oracle’s kernel cache software, and ktugct is part of Oracle’s kernel transaction layer:

Continue reading here, about hidden paramaters

http://www.dba-oracle.com/t_writing_alert_log_message.htm

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