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ashmasters's Introduction

see http://ashmasters.com for information on
Oracle Active Session History (ASH)

also see Tanel Poder's ash scripts at
http://blog.tanelpoder.com/files/scripts/ash/

queries contained in repository

  • ash_bbw.sql - buffer busy wait analysis
  • ash_enq.sql - enqueue wait analays
  • ash_graph.sql - basic ASH load chart in ASCII art more for demo purposes
  • ash_graph_waits.sql - basic ASH load chart in ASCII art with top 2 waits per bucket
  • ash_graph_waits_histash.sql - ASH load chart from DBA_HIST_ACTIVE_SESS_HISTORY only
  • ash_graph_histash_by_dbid.sql - ASH load chart from DBA_HIST_ACTIVE_SESS_HISTORY only, input DBID
  • ash_graph_histash_by_dbid_program.sql - ASH load chart from DBA_HIST_ACTIVE_SESS_HISTORY only, input DBID and PROGRAM
  • ash_graph_histash_by_dbid_sqlid.sql - ASH load chart from DBA_HIST_ACTIVE_SESS_HISTORY only, input DBID and a SQL_ID
  • ash_io_sizes.sql - I/O sizes from ASH
  • ash_sql_elapsed.sql - use ASH to find longest running SQL
  • ash_sql_elapsed_hist.sql - use ASH to find longest running SQL, give histogram of execution times
  • ash_sql_elapsed_hist_longestid.sql - use ASH to find longest running SQL, give histogram of execution times and execution id of longest running query
  • ash_top_procedure.sql - top procedures and who they call
  • ash_top_session.sql - top SESSION from ASH ordered by time broke into wait, I/O and CPU time
  • ash_top_sql.sql - top SQL from ASH ordered by time broke into wait, I/O and CPU time
  • ash_top_sql_w_top_obj.sql - top SQL from ASH ordered by time broke into wait, I/O and CPU time, include top object for I/O waits
  • latency_eventmetric.sql - wait event latency from V$EVENTMETRIC, ie last 60 seconds
  • latency_system_event.sql - wait event latency from DBA_HIST_SYSTEM_EVENT
  • latency_waitclassmetric.sql - User I/O latency from V$WAITCLASSMETRIC, ie over last 60 seconds

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