AWR compare report

I came across this while doing some dbreplays, and found it very useful.

First, lets say you have a RAC cluster,  and you want to do some performance comparisons .. What's one of the issues you run into ?  For me it is trying to figure out which nodes I care about, and running the AWR report for that node. This is exasperated with a Full Rack Exadata.  8 nodes to compare.  Well this is what I use to compare 2 time periods across all nodes.  I also increase some of the reporting thresholds..

First the script to gather the report. (here)

To get this to work change the following

dbid  - dbid for the first time period
begin_snap - begin snap first time period
end_snap - end snap first time period

dbid2 - dbid for the second time period
begin_snap2 - begin snap second time period
end_snap2 - end snap second time period

Also notice that I changed top_n_** values to give me more data

Rem    NAME
Rem      awr_full.sql - Workload Repository Global Compare Periods Report
Rem
Rem    DESCRIPTION
Rem      RAC Version of Compare Period Report
Rem
Rem
Rem    NOTES
Rem      Run as SYSDBA.  Generally this script should be invoked by awrgdrpt,
Rem      unless you want to pick a database and/or specific instances
Rem      other than the default.
Rem
Rem      If you want to use this script in an non-interactive fashion,
Rem      without executing the script through awrgdrpt, then
Rem      do something similar to the following:
Rem
      define  num_days     = 0;
      define  dbid         =2415508472; 
      define  instance_numbers_or_ALL    = 'ALL';
      define  begin_snap   = 35727;
      define  end_snap     = 35728;
      define  num_days2    = 0;
      define  dbid2        = 2415508472;
      define  instance_numbers_or_ALL2    = 'ALL';
      define  begin_snap2  = 35728;
      define  end_snap2    = 35729; 
      define  report_type  = 'html';
      define  report_name  = /tmp/awr_report.html
      define top_n_files        = 50;
      define top_n_segments     = 50;
      define top_n_services     = 50;
      define top_n_sql          = 100;
      @@?/rdbms/admin/awrgdrpi
!./mail_full.sql
exit

The second to last line of the script is to mail the report, and the script is here.

echo "From: replay_report@oracle.com"  > /tmp/mailfilebsg
echo "To: raddba@oracle.com"   >> /tmp/mailfilebsg
echo "Subject: DBREPLAY output "   >> /tmp/mailfilebsg
echo "Mime-Version: 1.0"      >> /tmp/mailfilebsg
echo 'Content-Type: multipart/mixed; boundary="DMW.Boundary.605592468"'   >> /tmp/mailfilebsg
echo "--DMW.Boundary.605592468" >> /tmp/mailfilebsg
echo " " >> /tmp/mailfilebsg
echo " dbreplay output " >> /tmp/mailfilebsg
echo " " >> /tmp/mailfilebsg
echo "--DMW.Boundary.605592468" >> /tmp/mailfilebsg
echo 'Content-Disposition: inline; filename="dbreplay.html"' >> /tmp/mailfilebsg
echo "Content-Transfer-Encoding: 7bit" >> /tmp/mailfilebsg
cat /tmp/awr_report.html >> /tmp/mailfilebsg
echo "--DMW.Boundary.605592468" >> /tmp/mailfilebsg
/usr/sbin/sendmail bryan..grenn@oracle.com < /tmp/mailfilebsg

The second script will mail you the output as an attachement.  So when using it, be sure to make the E-mail address yours, and change the subject, and filename to be what you want.

Enjoy. 

Taking a career change

Well, I have decided to make a change and take a job with oracle.  I am very excited about this move, and I look forward to being more involved in big data.  As any of you know (who have read my blog posts), I have taken a strong interest in this area.  I know I'm not the only one.  You probably have heard the terms  "Data Scientist"...   Hadoop...  R..  These are all the areas that I'm going to be delving into in my new position.
  I will continue to blog, probably mostly about the same topics I blog about now.  I am looking forward to this change, and becoming part of this evolution.  Many people are saying that Big Data is the next big change (like the internet),  whether this is true or not, we shall see. 

Problem debugging for DBFS

In trying to find out the cause of a DBFS issue, I learned what is expected (or helpful) when working with Support on DBFS issues.

1)  Logon trigger for dbfs user to create a trace file..

CREATE OR REPLACE TRIGGER DBFS_LOGON
AFTER LOGON
ON DATABASE
declare
username VARCHAR2(30);
BEGIN
  username:=SYS_CONTEXT('USERENV','SESSION_USER');
  IF username like 'FOO' then
    dbms_dbfs_content.setTrace(3);
    execute immediate 'alter session set events ''45050 trace name context forever, level 0xfffff'' ';
  END IF;
EXCEPTION
   WHEN OTHERS THEN
      NULL;
END;
/ 

2) Start the DBFS client with tracing turned on.  (-otrace_file=,trace_level=2,trace_size=0). (see How to trace DBFS when any failure happens [ID 1320683.1])

Remember if you are running DBFS, you are probably on a multi-node clustered environment, so you only need to do these steps on one of the nodes to gather the data.  I turned the logon trigger on, remounted the FS with tracing..  reproduced issue. Verified the log files were created, disabled trigger, remounted without tracing..  I did this on only one node, and gathered what I needed with minimal issues.