Tip

Determining transactions per second

When asked how many transactions per second were happening on each system, I realized that a quick approximation could be derived from the number of SCN changes per second as recorded in the logs, so I wrote the following code.

Management asked for a rough cut on the number of transactions per second because that's how vendors describe their systems. We were looking to replace our systems with newer, larger machines. Rather than just calculate an overall average, I realized that determining utilization by hour would let us identify peak loads so that the new machine could be sized to handle the peaks and not just the daily average. Subsequently, we use it to monitor system utilization: We watch for changes in the level of system utilization and can tell if an user performance concern is due to increased system load.

I've run it on Oracle 8 & 9. It does not work on 7.

set pages 60
set lines 132
set term off
ttitle off
column dbname  new_value  dbname
column time_stamp new_value time_stamp
column timestamp_np noprint
column year_np noprint
column month_np noprint
column mon format a3
column day   format a2
set verify off
select name dbname, substr(to_char(sysdate,'YYYY-Mon-DD HH24:MI:SS'),1,20)
time_stamp
   from v$database;
ttitle left "Transactions (SCNs) per second" center "&dbname" right
"&time_stamp"
set term on
column tps00 format 999 head "00"
column tps01 format 999 head "01"
column tps02 format 999 head "02"
column tps03 format 999 head "03"
column

    Requires Free Membership to View

tps04 format 999 head "04" column tps05 format 999 head "05" column tps06 format 999 head "06" column tps07 format 999 head "07" column tps08 format 999 head "08" column tps09 format 999 head "09" column tps10 format 999 head "10" column tps11 format 999 head "11" column tps12 format 999 head "12" column tps13 format 999 head "13" column tps14 format 999 head "14" column tps15 format 999 head "15" column tps16 format 999 head "16" column tps17 format 999 head "17" column tps18 format 999 head "18" column tps19 format 999 head "19" column tps20 format 999 head "20" column tps21 format 999 head "21" column tps22 format 999 head "22" column tps23 format 999 head "23" select * from ( select substr(year_np,1,8) timestamp_np, substr(year_np,5,2) Mon, substr(year_np,7,2) Day, sum(decode(substr(year_np,9,2),'00',1,0) * tps) tps00, sum(decode(substr(year_np,9,2),'01',1,0) * tps) tps01, sum(decode(substr(year_np,9,3),'02',1,0) * tps) tps02, sum(decode(substr(year_np,9,2),'03',1,0) * tps) tps03, sum(decode(substr(year_np,9,2),'04',1,0) * tps) tps04, sum(decode(substr(year_np,9,3),'05',1,0) * tps) tps05, sum(decode(substr(year_np,9,2),'06',1,0) * tps) tps06, sum(decode(substr(year_np,9,2),'07',1,0) * tps) tps07, sum(decode(substr(year_np,9,3),'08',1,0) * tps) tps08, sum(decode(substr(year_np,9,2),'09',1,0) * tps) tps09, sum(decode(substr(year_np,9,2),'11',1,0) * tps) tps10, sum(decode(substr(year_np,9,3),'11',1,0) * tps) tps11, sum(decode(substr(year_np,9,3),'12',1,0) * tps) tps12, sum(decode(substr(year_np,9,2),'13',1,0) * tps) tps13, sum(decode(substr(year_np,9,2),'14',1,0) * tps) tps14, sum(decode(substr(year_np,9,3),'15',1,0) * tps) tps15, sum(decode(substr(year_np,9,2),'16',1,0) * tps) tps16, sum(decode(substr(year_np,9,2),'17',1,0) * tps) tps17, sum(decode(substr(year_np,9,3),'18',1,0) * tps) tps18, sum(decode(substr(year_np,9,2),'19',1,0) * tps) tps19, sum(decode(substr(year_np,9,2),'20',1,0) * tps) tps20, sum(decode(substr(year_np,9,3),'21',1,0) * tps) tps21, sum(decode(substr(year_np,9,3),'22',1,0) * tps) tps22, sum(decode(substr(year_np,9,2),'23',1,0) * tps) tps23 from (select to_char(first_time,'YYYYMMDDHH24') year_np, (max(next_change#) - min(first_change#))/(60 * 60) tps from v$log_history group by to_char(first_time,'YYYYMMDDHH24') ) group by substr(year_np,1,8), substr(year_np,5,2), substr(year_np,7,2) ) order by timestamp_np /

For More Information

  • Feedback: E-mail the editor with your thoughts about this tip.
  • More tips: Hundreds of free Oracle tips and scripts.
  • Tip contest: Have an Oracle tip to offer your fellow DBAs and developers? The best tips submitted will receive a cool prize -- submit your tip today!
  • Ask the Experts: Our SQL, database design, Oracle, SQL Server, DB2, metadata, and data warehousing gurus are waiting to answer your toughest questions.
  • Forums: Ask your technical Oracle questions--or help out your peers by answering them--in our active forums.
  • Best Web Links: Oracle tips, tutorials, and scripts from around the Web.

This was first published in September 2002

There are Comments. Add yours.

 
TIP: Want to include a code block in your comment? Use <pre> or <code> tags around the desired text. Ex: <code>insert code</code>

REGISTER or login:

Forgot Password?
By submitting you agree to receive email from TechTarget and its partners. If you reside outside of the United States, you consent to having your personal data transferred to and processed in the United States. Privacy
Sort by: OldestNewest

Forgot Password?

No problem! Submit your e-mail address below. We'll send you an email containing your password.

Your password has been sent to:

Disclaimer: Our Tips Exchange is a forum for you to share technical advice and expertise with your peers and to learn from other enterprise IT professionals. TechTarget provides the infrastructure to facilitate this sharing of information. However, we cannot guarantee the accuracy or validity of the material submitted. You agree that your use of the Ask The Expert services and your reliance on any questions, answers, information or other materials received through this Web site is at your own risk.