Oracle allows more memory than sga + pga

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  Hello.

  I just received the laptop above, and it is slower than the evolution!

  Just checked the specs here - http://uk.computers.toshiba-europe.c...8&DISC_MODEL=1 and it says it is not expandable up to 1280 mb

  Someone told me that an update of the bios might allow for more memory, is it possible on this model and how would I go about this?

  Thanks in advance

  > Someone told me that an update of the bios might allow for more memory, is it possible on this model and how would I go about this?

  Someone is wrong, there is hardware limitation and the Bios Update will not allow you to expand the memory

  See you soon

• Direct model need more memory than other local communication protocols?

  Hi, for Timesten databases on the same server and applications we use direct model for performance bese.
  But I want to know what size of JVM segment are set for my java application when you activate the direct model?
  My application must head more memory when direct model than any other communication local protocols, such as the CPI or Unix domain socket?
  Assuming that my Timesten database takes 12 GB memory in OS, this means that I have to specify the same size for JVM heap(-Xmx12G)?
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• Oracle Concepts: Query processing SQL (SGA/PGA performance)

  Hello
  
  I need some clarification on my understanding, assume there is a query:

  SELECT t1.c1, t1.c2
  FROM t1, t2
  WHERE t1.c3 = t2.c1
  ORDER BY t1.c1;

  The user pointed out above the query and the following steps are performed:

  Syntax Check -in PGA
  Semantic Check -in PGA
  Shared Pool Check (unsuccessful) -in SGA
  Optimization (Hard Parse) -in SGA
  Row Source Generation (Hard Parse) -in SGA
  Execution - in SGA?

  User B sends a request even and following steps are performed:

  Syntax Check -in PGA
  Semantic Check -in PGA
  Shared Pool Check (successful) -in SGA
  (Soft Parse)
  Execution - in SGA?

  First question (general):
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  Second question (for user B):
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  Kind regards
  Ankit Rouault
  http://oraclenbeyond.blogspot.in

  NVO wrote:
  Hello

  I need some clarification on my understanding, assume there is a query:

  SELECT t1.c1, t1.c2
  FROM t1, t2
  WHERE t1.c3 = t2.c1
  ORDER BY t1.c1;
  

  The user pointed out above the query and the following steps are performed:

  Syntax Check -in PGA
  Semantic Check -in PGA
  Shared Pool Check (unsuccessful) -in SGA
  Optimization (Hard Parse) -in SGA
  Row Source Generation (Hard Parse) -in SGA
  Execution - in SGA?
  

  User B sends a request even and following steps are performed:

  Syntax Check -in PGA
  Semantic Check -in PGA
  Shared Pool Check (successful) -in SGA
  (Soft Parse)
  Execution - in SGA?
  

  First question (general):
  I thought execution happens to the LMS, but sort, hash, or bitmaps merger happens in PGA (temporary segment), then it's a subset of execution that happens in the PGA to the user?

  Execution happens in the SGA (buffer cache), but no matter what kinds of these treatment as sorting is specific session and that is why it happens in the PGA for this user.

  >

  Second question (for user B):
  Once check the shared pool is successful, and plan/data sets are already in SGA, so sort, hash, and/or merge bitmaps happen on these sets of data to the user of the PGA B?

  Yes.

  That said, you can post a link that confirms that the syntax/semantics check occur in the PGA? As far as I know this isn't really a part of the PGA because code oracle itself stock grammar and would do it.

  Aman...

• install more memory on xp

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  This has nothing to do with Windows.  It depends on your hardware.

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• SGA, PGA is greater than the memory and oracle does not work

  Hello

  Wrongly, I put the following:

  ALTER system SET sga_max_size = 1500M scope = spfile;

  ALTER system SET SGA_TARGET = 1400M scope = spfile;

  ALTER SYSTEM SET PGA_AGGREGATE_TARGET = 9000M scope = spfile;

  My total memory is 16 GB, Win8

  When I rebooted the oracle, he could not start and I m sure 100% that these sizes of memory are the problem.

  Now, I can not connect to the DB set these sizes of memory.

  How can I change the SGA, PGA, while the entire oracle is down? It is not only the DB instance that is nt working. It s the entire oracle.

  Is it possible to change the spfile from a text editor?

  I d appreciate your quick responses.

  Kind regards

  Hussien Sharaf

  Post edited by: 3008910

  Vidar, great recommendation.  There are cases where the spfile directly change can cause problems. If you happen who meet and the spfile is not usable, you can also create a new pfile of content in the journal of the alerts, start the instance by using the new file pfile, then make a copy of the pfile to the spfile.  Here are the basic steps if the spfile is corrupted and you need to create a new:

  (1) find the alerts log, copy the lines below the comment "parameters of the system with default values:" in a new file calledinit .ora and save the file in the directory by default (dbs or database) file.

  (2) make sure that the bad spfile is not in the directory of the file/start setting and start the Oracle service & the instance should now be available.  If you are not able to connect as "/" try to use sys / as sysdba

  (3) create a copy of the spfileinit .ora file: sql > create spfile from pfile;     -You can specify the directories, or leave the default value.

  (4) return & validate the parameters according to the directives of our discussion earlier.

  Hussien, I hope this helps.

  CP

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• Why oracle RAC 11.2.0.2 give more trouble than oracle 11.2.0.1?

  Hi all
  
  I just want to know, why oracle RAC 11.2.0.2 giving more problem than oracle 11.2.0.1?
  The problems here:
  
  1 resolved multicast (multicast open or patch)
  Miladin Modrakovic through. His blog issue-with-oracle-11-2-0-2-new-redundant-interconnect give me a solution to open Multicast 230.0.1.0 on cisco switch
  
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  Someone has already asked on this forum: runcluvfy failed with PRVF-5636, but still no solution for this problem of PRVF-5636.
  
  
  
  
  Thank you
  
  
  Indra
  
  Published by: indra on Sep 6, 2011 12:00 AM

  Hello

  I just want to know, why oracle RAC 11.2.0.2 give me more problem than oracle 11.2.0.1?

  You can use Oracle Support to fix all bugs on Oracle software. Simply open the SR

  1 resolved multicast (multicast open or patch)

  This bug is documented for the Clusterware installation, find the Bug 9974223:
  http://download.Oracle.com/docs/CD/E11882_01/READMEs.112/e17129/TOC.htm#CHDIEHCH

  * Oracle Grid Infrastructure 11.2.0.2 Installation or upgrade may fail due to the requirement of multicast [1212703.1 ID] *.

  2 DNS problem (PRVF-5636: DNS response for an unreachable node time exceeded "15000" ms)

  This isn't an Oracle problem, but a DNS problem that can cause instability in the clusterware, YES does not proceed without resolving the problem in your nodes.

  Date of arrival:

  /etc/resolv.conf
  /etc/nsswitch.conf
  
  find line hosts:  on file nsswitch.conf
  The order of keywords on this line indicates the order in which your SO references the name services. (dns or host file) 
  

  Kind regards
  Levi Pereira

  Published by: Levi Pereira Sep 5, 2011 14:08

• How to write the validation at the point of java sript should not allow more than 20 ch

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  I need to write validation java script for an item, that it should not allow more than 20 characters.
  
  
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• BC can allow more than 10 users

  BC allows more users then 10 for Web site?

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• DB face memory pressure and need more memory?

  
  Hi all

  DB: 10g and 11g

  Need your advice.

  We provide the server db use memory and cpu management report on monthly basis.

  Average usage of memory the server is more or less the same each month that memory allocated to oracle is capped (for example, memory_target).

  Therefore, we will not be able to tell if the memory allocated to the sufficient DB and when does more memory?

  We are required to provide a usage report to show that the memory allocated to the database itself is enough on monthly basis and does not need to bulk up.

  Is there a good way to provde this?

  Our DBs are all OLTP and rarely do full scan.

  First thought to provide the trend of BHCR (above 90%, this means memory is sufficient). Read a large number of documents that BHCR is no longer useful.

  A better way to do it? Kindly share your experiences.

  Thank you

  You can keep in mind what the different parts of the memory.  The SGA is a shared resource, which includes the areas of code and data, and even those who can interleave in pressure of circumstances.  The PGA is determined by the use of the users.  The trend of the latest versions of Oracle is spending more major requests for data at the PGA, but which cannot affect you much if you're like really OLTP, as you describe (which one silent report or batch could blow).  So really, after getting the right CMS, the PGA is more likely to be affected by the increase in the number of users.  Mechanisms of the target to be fairly stable systems (as well as assignments of similar resources carried out by reasonable operating systems) translated well enough glancing SGA and PGA advice and after it.

  Using the resources on a system close to their means of amount maximum, there are times when performance will go downhill fast, simply because of a resource to bite.  (For a good time in mathematics, see the white paper to think clearly on Cary Millsap's performance.)  These types of problems can come from many sources, if a regime change, hardware malfunction or a simple increase in its attendance.  Those who dance near the line will inevitably have to step on it, or some such maxim comes from jurisprudence.

  So the desire of the management of the Non-becassine-hunt is to anticipate and avoid such problems without too much purchase hardware or compulsive, disorder of tuning.  The idea is to make an analysis of trends which allows to predict that an increase in its attendance will make things down a steeply, to do what is necessary to avoid it (or at least expects).

  Oracle has a report to do this?  Not really.  There are too many variables and too many ways to use and abuse a system.  Most performance problems are SQL issues.

  What you can do is to simulate accurately the workload on a test system, increasing its failure.  This as an exercise in iterative parameterization can give a good idea of what settings are required in order to maximize what you can use and an idea what kind of use will start demanding more material.  For a well designed system, it can be as simple as looking at the number of users and uses of the pga.

• Oracle uses my memory without permission?

  Hi gurus,
  
  First time I saw this situation. I have a server with about 10 GB of RAM. 4 GB of that memory is set for Oracle SGA, PGA and other spaces of memory to oracle. But for a few days (orders 'free-m' and "ps - EO mmtp, rss"), I noticed that more than 90% of this memory is used by oracle treats (user and background processes).
  What is the most interesting 2 process that uses memory, most are dbw0 and dbw1. As I checked the database of this beginning of 2 process about 7 working days ago. During this couple of days that my database is not using so much I don't know what they're doing so long and why they used about 20% of my memory.
  
  Hope to hear your opinion on my situation.
  
  DB-> 11 g
  OS--> RHEL

  database writer process begins when you start the database instances and stop when you close to the bottom so its normal for them to be present.

  Reported memory as used by a process includes shared memory, a rough estimate of how much is shared and how much is not shared can be found using the proc and IPCS-m file system. p. ex.

  Cat ' ps - ef | grep "oracle" | grep - v grep | AWK ' {print "/ proc /" $2 "/ freddy'smaps"} "| grep Rss | "awk ' {sum += $2} END {print" RSS: "sum/1024" MB""} "

  will give you the total memory used by the oracle process

  Cat ' ps - ef | grep "oracle" | grep - v grep | AWK ' {print "/ proc /" $2 "/ freddy'smaps"} "| grep Shared | AWK ' {sum += $2} END {print "Shared:" sum/1024"MB" "}'

  I will tell you how much of that is shared memory.

  IPCS m | grep "oracle" | grep - v grep | AWK ' {sum += $5} END {print "ipcsmemory:" sum/1024/1024"MB" "}'

  Tell you the total size of the segments shared memory to oracle.

  to get the total memory used by oracle, subtract the second number from the first, then add the third. for example.

  Cat ' ps - ef | grep "oracle" | grep - v grep | AWK ' {print "/ proc /" $2 "/ freddy'smaps"} "| grep Rss | "awk ' {sum += $2} END {print" RSS: "sum/1024" MB""} "
  RSS: 33919,1 MB
  Cat ' ps - ef | grep "oracle" | grep - v grep | AWK ' {print "/ proc /" $2 "/ freddy'smaps"} "| grep Shared | AWK ' {sum += $2} END {print "Shared:" sum/1024"MB" "}'
  In common: 30022,1 MB
  IPCS m | grep "oracle" | grep - v grep | AWK ' {sum += $5} END {print "ipcsmemory:" sum/1024/1024"MB" "}'
  ipcsmemory: 4002 MB

  real memory used = (33919.1 - 30022.1) + 4002 = 7899 MB

  More or less, as the scripts read from / proc data will not be a consistent point in time.

  Warning: this is a very rough calculation, I hit upwards to prevent people complaining that oracle was using 150-300% of the available memory, may be completely wrong and defiantly won't work if you use WMA (memory_target/max_memory_target).