On reporting queries, there are too many “enq: KO – fast object checkpoint” wait event. All reporting queries are doing full table scans concurrently. Oracle uses direct path reads instead of db file scattered reads. And direct path reads require a checkpoint “_serial_direct_read”=NEVER Parameter Session Value Instance Value ————————————————– —————————— —————————— _serial_direct_read auto auto
/********************************************Author: Paresh MehtaScript Name : waitt.sqlwaits order by sql start time********************************************/set feedback 1set pages 2000set lines 190column event format a45column machin format a12column modul format a10column prg format a10column osuser1 format a10column username format a10column sesinfo format a15column blockedby format a15alter session set nls_date_format=’DDMONRR:HH24:MI:SS’;select /*+ first_rows(100) */ a.sid || ‘,’ || a.serial# || ‘,@’ ||…
ref: http://blog.tanelpoder.com/2009/05/06/free-dba_hist-awr-views-in-11g/ When you access Oracle AWR (and other licensed features/tables/views) then these do show up in DBA_FEATURE_USAGE_STATISTICS. Exporting the contents is the same as accessing these with your SQL. All data dictionary views beginning with the prefix DBA_HIST_ are part of this pack, along with their underlying tables.The only exception are the views: DBA_HIST_SNAPSHOT,…
SET MARKUP HTML ON SPOOL ON generates an HTML page for each subsequently spooled file. The HTML tags in a spool file are closed when SPOOL OFF is executed or SQL*Plus exits. You can use SET MARKUP HTML ON SPOOL OFF to generate HTML output suitable for embedding in an existing web page. HTML output…
