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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:

dba_hist_active_session_history
dba_hist_active_session_history_bl
dba_hist_bg_event_summary
dba_hist_event_name
dba_hist_metric_name
dba_hist_sessmetric_history
dba_hist_sys_time_model
dba_hist_sys_time_model_bl
dba_hist_sysmetric_history
dba_hist_sysmetric_summary
dba_hist_sysstat
dba_hist_sysstat_bl
dba_hist_system_event
dba_hist_system_event_bl
dba_hist_waitclassmetric_history
dba_hist_waitstat
dba_hist_waitstat_bl

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:

http://www.rampant-books.com/book_1002_oracle_tuning_definitive_reference_2nd_ed.htm

 

 

   

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