Automatic Checkpoint Tuning in Oracle 10g
Hi ,
How to confirm if the database has been configured for automatic checkpoint tuning...????
Many thanks...
Sim
The log_checkpoint_timeout (default 1800) gives Oracle a time-based target, and the log_checkpoint_interval (default 0, meaning the action is based on the size of the current redo log file) give Oracle a 'volume-based' target.
The target affects the rate at which the database writer writes dirty blocks to disk. Every three seconds the database writer wakes up and checks the tail-end of the checkpoint queue and writes out any blocks that were attached to the queue too far in the past.
In this context, "too far in the past" means either "more seconds in the past than the[i] log_checkpoint timeout" or "made dirty by a change described in a redo block more than log_checkpoint_interval blocks back from the current block".
If you set fast_start_mttr_target to a non-zero number of seconds then Oracle tries to treat that as a request to write out dirty blocks sufficiently rapidly that crash recovery will take no more than that number of seconds. In effect this makes Oracle change the internal value of log_checkpoint_interval and log_checkpoint_timeout dynamically every few seconds.
Recoverty requires Oracle to apply the redo log from a known point - which means reading and applying a certain amount of redo to a number of "out of synch" blocks that have to be read from disk. So the fast_start_mttr_target code is constantly calculating how much redo would have to be read and applied, and how many data blocks would have to be read and fixed - and writing dirty blocks fast enough to make it possible to do that work within the given time limit.
Setting the parameter to zero is (as it is with many numerical parameters) equivalent to not setting it at all. If you try to set the parameter to a very small value (say 30 seconds) you may end up finding lots of messages in your alert log saying something like: "I can't honour your request to recover in 30 seconds, the best I can do is XXX".
Regards
Jonathan Lewis
http://jonathanlewis.wordpress.com
http://www.jlcomp.demon.co.uk
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Does anyone have an idea with the following sentence?
Automatic checkpoint tuning is enabled when FAST_START_MTTR_TARGET is not explicitly set to zero.
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sda2 0.22 0.00 0.01 0.00 0.23 0.00 18.78 0.00 4.05 3.54 0.00
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sda4 0.00 0.00 0.00 0.00 0.00 0.00 1.83 0.00 0.33 0.33 0.00
sda5 0.83 1.95 0.55 2.70 31.62 37.24 21.17 0.03 8.88 3.49 1.13
sda6 0.68 0.07 0.06 0.04 1.11 0.85 19.74 0.00 13.91 9.05 0.09
sda7 0.33 0.14 0.04 0.07 0.90 1.63 24.17 0.00 15.73 11.13 0.12
sdb 0.06 0.00 0.03 0.00 0.75 0.00 25.57 0.00 1.64 1.48 0.00
sdb1 0.04 0.00 0.01 0.00 0.45 0.00 34.90 0.00 3.13 2.85 0.00
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sdc1 5.79 0.16 45.02 2.74 7804.99 129.85 166.12 2.57 53.85 9.12 43.57
sdd 5.85 0.17 44.45 2.68 7767.34 133.80 167.65 2.68 56.95 9.43 44.43
sdd1 5.78 0.17 44.42 2.68 7767.06 133.80 167.74 2.68 56.98 9.43 44.43
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sde1 5.82 0.16 44.83 2.37 7774.55 122.75 167.31 2.24 47.54 8.96 42.29
sdf 5.91 0.16 63.70 2.69 8053.71 133.15 123.32 2.98 44.89 7.59 50.40
sdf1 5.84 0.16 63.67 2.69 8053.43 133.15 123.36 2.98 44.91 7.59 50.39
sdg 0.19 0.11 0.07 0.61 2.54 131.30 199.27 0.04 65.76 28.52 1.92
sdg1 0.12 0.11 0.04 0.61 2.25 131.30 206.81 0.04 68.26 29.56 1.91
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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 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
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18.64 0.00 5.29 49.87 0.00 26.20
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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
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 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. -
JMS Adapter Tuning in Oracle 10G SOA suite - Fixing the Errors
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Ubuntu and Debian are good distros as well. I have not been successfull with Suse though.
Suse in the past -- the installer could not get the graphics correct -- garbage just displays -- so i could never install it. Maybe SuSe 10 has improved since then.
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http://www.novell.com/coolsolutions/tip/16193.html
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We are upgrading our database from 9i to 10g.
There are the "Select distinct" queries in the code which populated the grid on the applications screens. We found a difference in 9i and 10g the way the result is populated for these queries. If "Select Distinct" query wihtout a order by clause is executed in 9i then the result is automatically sorted. But Oracle 10g does not do this.
We can change the queries adding order by clause but we are almost at the end of the testing and want to know if there is any way that we can do this from database settings. Would there be any impact of these settings change on overall operation of Oracle 10g?
I would appreciate if some one can help me here.
Thanks,
Dineshthen the result is automatically sorted.No. Oracle may have done a sort operation to perform the distinct, but it still did not guarantee the order of your results.
In 10g and in 9i, if you want your results in a certain order you must use order by. -
How to Install oracle 10g in a gues OS?
Hello All,
I have installed Oracle Linus 5 using the template.
Since Oracle Linux Template does not have the X server, how would one install Oracle 10g using GUI.
Should i go for the 'un attended' installation ?
Also, can i use the same 10201_database_linux32.zip bundle that i use for RH4 ?
But the inside oraparam.ini, it does not 've any details about the oracle linux( only Linux=redhat-3,SuSE-9,redhat-4,UnitedLinux-1.0,asianux-1,asianux-2)
TIA,
JJI would recommend downloading the Oracle 10g template for Oracle VM from eDelivery. This automatically installs and configures Oracle 10g for you. This is a much simpler configuration path, as the OS and Oracle are pre-configured to work under Oracle VM. There are plenty of [Oracle VM Templates|http://www.oracle.com/technology/products/vm/templates.html] to chose from!
Otherwise, I would recommend downloading and installing Oracle 10g 10.2.0.4 which includes support for installing on Oracle Enterprise Linux. You can install 10.2.0.1, but you would need to tweak some files first to fool the installer into thinking you're running on Red Hat Enterprise Linux. -
Oracle 10g will do stats automatically ?
oracle : 10.2.0.3
os : linux
How oracle 10g will gather stats automatically ? How to check whether which scheduler is capturing stats, interval ,last gathered status and also next interval?
it will take only system level stats ? also object level stats also ?
pl. explainHi,
Please read this,
http://download.oracle.com/docs/cd/B19306_01/server.102/b14211/stats.htm#i41282
It wont capture system stats.Only object level stats are gathered.Oracle recommends to gather the system stats manualy.
HTH
Aman.... -
Oracle 10G Checkpoint not complete Cannot allocate new log
We have an oracle 10G database that has 4 groups of 200M redo logs. We are constantly seeing Checkpoint not complete followed by Cannot allocate new log.. messages in the alert log. When I look at the v$instance_recovery table I see this:
SQL> select WRITES_MTTR, WRITES_LOGFILE_SIZE, WRITES_LOG_CHECKPOINT_SETTINGS, WRITES_OTHER_SETTINGS,
2 WRITES_AUTOTUNE, WRITES_FULL_THREAD_CKPT from v$instance_recovery;
WRITES_MTTR WRITES_LOGFILE_SIZE WRITES_LOG_CHECKPOINT_SETTINGS
WRITES_OTHER_SETTINGS WRITES_AUTOTUNE WRITES_FULL_THREAD_CKPT
0 0 66329842
0 309461 41004
It seems most of our checkpointing is being caused by the log_checkpoint_interval being set to 10000, which means we are doing 20 checkpoints during one redo log since our OS blocksize is 1024. What I'm thinking about doing is first adding two more redo log groups, and then either increasing the log_checkpoint_interval to 40000 (5 checkpoints for one redo log) or unsetting log_checkpoint_interval and setting fast_start_mttr_target to 600. Which would be the recommended parameter change? I think Oracle recommends using the fast_start_mttr_target. Are there any other suggestions?Hi
>>unsetting log_checkpoint_interval and setting fast_start_mttr_target to 600.
its a better idea,look on it
http://download-uk.oracle.com/docs/cd/B19306_01/server.102/b14237/initparams068.htm#REFRN10058
Just set fast_start_mttr_target parameter.it will resolve ur problem.
Thanks
Kuljeet
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