ASH table data collection
After the x$ structures are materialized in the
v$active_session_history and v$session_wait_history views, a new
AWR snapshot transfers (and aggregates) the vents into
corresponding dba_hist_active_sess_history and other dba_hist
tables. Table 16.1 below shows some of the most important
Oracle10g ASH wait event tables:
Table 16.1: Oracle10g wait event dba_hist tables
The following section begins with a quick review of Oracle wait
events in order to assist users’ understanding of how they can
help identify and tune bottlenecks in the database.
SEE CODE DEPOT FOR FULL SCRIPTS
This is an excerpt from my latest book "Oracle
Tuning: The Definitive Reference".
You can buy it direct from the publisher for 50%-off and get
instant access to the code depot of Oracle tuning scripts: