Database Tuning
Hello,
I was trying to configure database control today (EM) on 11g R1. i had problems initially configuring it so i decided to drop the EM repository, but when i did so it was stuck on only one place and wasnt moving further. I then noticed that when i try to log into any user from sqlplus it just hangs and doesnt move forward.
I then cancelled the drop repository job which then allowed users to login. I also ran the addm report, please see below. I need a recomedation on what i need to do to solve this issue if i happen to recreate the EM repository again, ofcourse i dont want users waiting again.
Findings and Recommendations
Finding 1: Session Slot Scheduling
Impact is 9.36 active sessions, 94.76% of total activity.
Database sessions were found waiting for Oracle Resource Manager's active
session slots.
Recommendation 1: Database Configuration
Estimated benefit is 9.36 active sessions, 94.76% of total activity.
Action
Sessions were found waiting for active session slots. Consider
increasing the active session limit for these Oracle Resource Manager
consumer groups.
Symptoms That Led to the Finding:
Wait class "Scheduler" was consuming significant database time.
Impact is 9.36 active sessions, 94.76% of total activity.
user8741020 wrote:
Hello,
I was trying to configure database control today (EM) on 11g R1. i had problems initially configuring it so i decided to drop the EM repository, but when i did so it was stuck on only one place and wasnt moving further. I then noticed that when i try to log into any user from sqlplus it just hangs and doesnt move forward.
I then cancelled the drop repository job which then allowed users to login. I also ran the addm report, please see below. I need a recomedation on what i need to do to solve this issue if i happen to recreate the EM repository again, ofcourse i dont want users waiting again.
Findings and Recommendations
Finding 1: Session Slot Scheduling
Impact is 9.36 active sessions, 94.76% of total activity.
Database sessions were found waiting for Oracle Resource Manager's active
session slots.
Recommendation 1: Database Configuration
Estimated benefit is 9.36 active sessions, 94.76% of total activity.
Action
Sessions were found waiting for active session slots. Consider
increasing the active session limit for these Oracle Resource Manager
consumer groups.
Symptoms That Led to the Finding:
Wait class "Scheduler" was consuming significant database time.
Impact is 9.36 active sessions, 94.76% of total activity.I can't seem to get to tahiti right now to cite the source, but as I recall, dropping/recreating the repository quiesces the database. It will impact users. You just have to pick a best time to do it.
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Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s avgrq-sz avgqu-sz await svctm %util
sda 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
sda1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
sda2 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
sda3 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
sda4 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
sda5 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
sda6 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
sda7 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
sdb 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
sdb1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
sdc 18.00 0.00 54.00 2.00 25984.00 160.00 466.86 8.96 94.18 17.89 100.20
sdc1 18.00 0.00 54.00 2.00 25984.00 160.00 466.86 8.96 94.18 17.89 100.20
sdd 18.00 0.00 79.00 2.00 40240.00 32.00 497.19 8.61 118.93 12.04 *97.50*
sdd1 18.00 0.00 79.00 2.00 40240.00 32.00 497.19 8.61 118.93 12.04 *97.50*
sde 19.00 0.00 44.00 8.00 26656.00 187.00 516.21 9.34 119.81 19.27 *100.20*
sde1 19.00 0.00 44.00 8.00 26656.00 187.00 516.21 9.34 119.81 19.27 *100.20*
sdf 26.00 0.00 76.00 6.00 35600.00 59.00 434.87 3.23 40.76 10.52 86.30
sdf1 26.00 0.00 76.00 6.00 35600.00 59.00 434.87 3.23 40.76 10.52 86.30
sdg 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
sdg1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
sdh 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
sdh1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
avg-cpu: %user %nice %system %iowait %steal %idle
18.64 0.00 5.29 49.87 0.00 26.20
Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s avgrq-sz avgqu-sz await svctm %util
sda 0.00 14.00 0.00 3.00 0.00 136.00 45.33 0.01 1.67 1.67 0.50
sda1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
sda2 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
sda3 0.00 14.00 0.00 3.00 0.00 136.00 45.33 0.01 1.67 1.67 0.50
sda4 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
sda5 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
sda6 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
sda7 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
sdb 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
sdb1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
sdc 44.00 0.00 99.00 1.00 58368.00 8.00 583.76 12.03 154.83 9.66 96.60
sdc1 44.00 0.00 99.00 1.00 58368.00 8.00 583.76 12.03 154.83 9.66 96.60
sdd 44.00 0.00 103.00 0.00 50672.00 0.00 491.96 10.07 82.47 8.37 86.20
sdd1 44.00 0.00 103.00 0.00 50672.00 0.00 491.96 10.07 82.47 8.37 86.20
sde 45.00 0.00 110.00 5.00 58176.00 126.00 506.97 13.01 113.47 8.02 92.20
sde1 45.00 0.00 110.00 5.00 58176.00 126.00 506.97 13.01 113.47 8.02 92.20
sdf 40.00 0.00 122.00 5.00 52944.00 126.00 417.87 9.74 63.94 6.52 82.80
sdf1 40.00 0.00 122.00 5.00 52944.00 126.00 417.87 9.74 63.94 6.52 82.80
sdg 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.00 0.00 0.90
sdg1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.00 0.00 0.90
sdh 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
sdh1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
avg-cpu: %user %nice %system %iowait %steal %idle
7.48 0.00 2.49 *61.60* 0.00 28.43
Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s avgrq-sz avgqu-sz await svctm %util
sda 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
sda1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
sda2 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
sda3 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
sda4 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
sda5 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
sda6 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
sda7 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
sdb 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
sdb1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
sdc 13.86 0.00 38.61 0.99 19611.88 11.88 495.50 3.35 79.53 25.03 99.11
sdc1 13.86 0.00 38.61 0.99 19611.88 11.88 495.50 3.35 79.53 25.03 99.11
sdd 15.84 0.00 40.59 0.99 17758.42 31.68 427.81 10.93 122.36 23.26 96.73
sdd1 15.84 0.00 40.59 0.99 17758.42 31.68 427.81 10.93 122.36 23.26 96.73
sde 12.87 0.00 46.53 1.98 22035.64 70.30 455.65 13.19 275.96 20.43 99.11
sde1 12.87 0.00 46.53 1.98 22035.64 70.30 455.65 13.19 275.96 20.43 99.11
sdf 13.86 0.00 39.60 2.97 17584.16 101.98 415.42 6.83 81.19 22.21 94.55
sdf1 13.86 0.00 39.60 2.97 17584.16 101.98 415.42 6.83 81.19 22.21 94.55
sdg 0.00 0.00 0.00 0.99 0.00 7.92 8.00 0.21 226.00 217.00 21.49
sdg1 0.00 0.00 0.00 0.99 0.00 7.92 8.00 0.21 226.00 217.00 21.49
sdh 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
sdh1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
avg-cpu: %user %nice %system %iowait %steal %idle
24.69 0.00 8.98 48.38 0.00 17.96
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sda 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
sda1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
sda2 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
sda3 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
sda4 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
sda5 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
sda6 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
sda7 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
sdb 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
sdb1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
sdc 25.00 0.00 61.00 4.00 36304.00 120.00 560.37 9.58 156.23 14.78 96.10
sdc1 25.00 0.00 61.00 4.00 36304.00 120.00 560.37 9.58 156.23 14.78 96.10
sdd 23.00 0.00 82.00 1.00 34832.00 32.00 420.05 7.61 163.49 11.27 93.50
sdd1 23.00 0.00 82.00 1.00 34832.00 32.00 420.05 7.61 163.49 11.27 93.50
sde 27.00 0.00 62.00 0.00 32864.00 0.00 530.06 9.41 149.56 16.15 100.10
sde1 27.00 0.00 62.00 0.00 32864.00 0.00 530.06 9.41 149.56 16.15 100.10
sdf 17.00 0.00 101.00 4.00 42656.00 132.00 407.50 4.18 88.24 6.72 70.60
sdf1 17.00 0.00 101.00 4.00 42656.00 132.00 407.50 4.18 88.24 6.72 70.60
sdg 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
sdg1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
sdh 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
sdh1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00Regards,
Nayagan
Edited by: nayagan on Jan 27, 2010 12:23 PM
Edited by: nayagan on Jan 27, 2010 2:04 PMTwo points:
1. I can not read what you posted because you did not read the FAQ (upper right) and put tags around the listing so it would retain its formatting.
2. Even if I could read them I wouldn't as they are not necessarily relevant. What I would want to see is what query you are issuing that you think should be maxing out your disk subsystem and giving you the performance you expect. Single block reads read single blocks. Post the DML and the corresponding explain plan report generated using DBMS_XPLAN.DISPLAY or AUTOTRACE. Also the result of this statement in SQL*Plus.show arraysize
Because this is precisely what is going to be brought back with each round trip between the client (SQL*Plus) and the server. -
Oracle 10g performance tuning tools
hi,
can anyone please suggest me any oracle database tuning tool to use for improving the performance of the database?(oracle 10g)Hi,
Do you want a tuning tool that does not require the user to have in-depth Oracle knowledge? If so, try here:
http://images.google.com/images?&q=ouija+board&um=1&ie=UTF-8&sa=N&tab=wi
Seriously, I like to use AWR and STATSPACK reports, and there are some freeware tools to help analyze them, one that I sponsor:
http://www.statspackanalyzer.com
For online tools, Oracle SQL Developer is a great way to get started, as-is the Oracle performance pack:
http://www.oracle.com/technology/products/database/sql_developer/index.html
For third-party tuning tools, look at Confio, quite good:
http://www.confio.com/
Hope this helps. . .
Don Burleson
Oracle Press author
Author of “Oracle Tuning: The Definitive Reference”
http://www.dba-oracle.com/bp/s_oracle_tuning_book.htm
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