Frequently shared pool is empty. The impact?

Similar Questions

• Shared pool larger than the buffer cache

  Hi all
  
  My database is 10.2.0.4 running linux platform
  
  No .of 2 cpu, RAM-2 GB
  
  SGA_TARGET wa set to 1 GB.
  
  Initially the memory have been configured as a shared pool around 300 MB and the buffer cache about 600 MB.
  
  When I questioned the v$ sga_resize_ops views I found some interesting results.
  
  Many operations and growth reduction were happened and the current size of the shared pool is about 600 MB and buffer cache is 300 MB. (this happened during last 1)
  
  I guess that the buffer cache must always be larger than the size compared to a shared pool. My assumption is right?
  
  Is it because of sql code using the do not bind variables resulting in growth shared pool? No relaods and radiation are almost ignored I think it should not be the case.
  
  Also no lock events listd in the top5
  
  I've also seen the 15% of the shared pool is marked as being of kGH:NO ACCESS, which means that the part is used for the cache buffers.
  
  Should I set the lower limit for the shared pool and the buffer cache or can I just ignore it.
  
  Thank you
  rajdhanvi

  You change your question now... your question was that he has sharedpool large size > buffer cache is acceptable... . Check your own second post... for your new question now is why pool continues to increase and partly used as buffer cache... the proof is given by tanel poder y what happens when EAMA is used... For the Kingston general hospital: NO ACCESS means that no one else could touch...

  Concerning
  Karan

• Why my static PL/SQL within SQL local variable is not transformed in space in the shared pool?

  Hello everyone,

  Oracle version: 12.1.0.1.0 - 64 bit

  OS: Linux Fedora Core 17 X86_64

  Description of the problem:

  I'm reading an interesting book of online oracle named: SQL in PL/SQL

  On page 11, it reads the following:

  In the absence of a compilation error, the PL/SQL compiler generates an equivalent statement of SQL regular text and stores this with the generated machine code. This instruction uses placeholders where the embedded SQL statement uses identifiers that have been resolved in the PL/SQL unit.

  What I understand of this (please, correct me if I'm wrong) is that whenever I write some static/embedded statement SQL within a PL/SQL block in which there are a few local variables in PL/SQL, and then final generated SQL statement (after resolution of identifier) will include placeholders (bind variables) instead of these identifiers the PL/SQL.

  I just wanted to see this in practice, so I made the following test:

  Test case:

  SQL> connect / as sysdba
  SQL> alter system flush shared_pool
  
  system altered
  

  So, normally, after execution of the foregoing the shared_pool on my development environment is now empty.

  And then I run the following PL/SQL block

  <<b>>
  declare
      depid hr.employees.department_id%type := 100;
      cnt   pls_integer := 0;
  begin
      select
          count(*)
      into
          b.cnt
      from
          hr.employees t1
      where
          t1.department_id = b.depid;
  end;
  /
  --
  --
  column sql_id new_value sqlid_saved;
  --
  select
      v1.sql_id
  from
      v$sql v1
  where
      v1.sql_text like '%t1.department_id = b.depid%';
  --     
  -- 
  select
      v1.sql_text
  from
      v$sql v1
  where
      v1.sql_id = '&sqlid_saved';
  

  And the result was:

  SQL_ID
  -------------
  687dxvsmrwm9z
  g17tjb3f8t94y

  6 old: v1.sql_id = "& sqlid_saved"
  6 new: v1.sql_id = "g17tjb3f8t94y".

  SQL_TEXT
  --------------------------------------------------------------------------------
  < < b > > declare depid hr.employees.department_id%type: = 100;     CNT pls_in
  SEB: = 0; Start select count (*) in b.cnt of
  T1 hr. Employees where t1.department_id = b.depid; end;

  
  SQL >

  What I don't understand is the main part of the SQL_TEXT I put in red.

  Instead of

  T1.department_id = b.depid

  I expected to see something like

  T1.department_id = : B

  In other words, some bind variable, because depid is a local variable inside my PL/SQL block used in integrated/static SQL statement, so it must be converted to a reserved space in the shared pool instead of the original identifier.

  You kindly could you tell me what I misunderstood?

  Thanks in advance

  > But once again no variable binding in the stored/parsed SQL statement. That's what I don't understand.

  Submitted by PL/SQL SQL is "normalized", which includes (among other things) convert uppercase. Your query on v$ sql is looking for '% hr.employees% '.

• Purpose of the Shared Pool

  Hello
  
  The library cache stores the info on them recently use SQL & PL/SQL statements.
  
  The data dictionary cache stores data in database files, tables, etc.
  
  Is there any specific use other than being the container to these 2 Cache the shared pool?

  user12022313 wrote:
  Hello

  The library cache stores the information on the SQL & PL/SQL used statements recently.

  The data dictionary cache stores data in database files, tables, etc.

  Is there any specific use other than being the container to these 2 Cache the shared pool?

  The answer is "it depends." The above are only 2 structures of many other many other structures available in the shared pool. Starting from 10 g, even the undo and redo are kept within the shared pool itself. But most of the structures in the town of pool other than Library Cache and data dictionary Cache requires no intervention on our part is why they are more often discussed in almost every document/place.

  HTH
  Aman...

• ORA-04031: unable to allocate 32 bytes of shared memory ('shared pool'.  Check your error messages for the cause of the error. (= &lt; POINTER &gt;)

  Dear team,

  We have for instance R12.

  DB - 11.2.0.3

  12.1.2 - application

  in this concurrent instance depressed frequently when checking of log file showing the error as

  List of errors encountered:

  .............................................................................

  _ 1 _

  Systematic FDPCRQ met an ORACLE error. ORA-04031: unable to

  allocate 32 bytes of shared memory ('shared pool'.

  Check your error messages for the cause of the error. (= < POINTER >)

  .............................................................................

  APP-FND-01388: cannot read the value for the profile FND_MGR_STRTUP_THRES_TIME option in the routine, and routine.

  List of errors encountered:

  .............................................................................

  _ 1 _

  Routine AFPCAL has received the code of failure while running or analysis of your

  simultaneous program CPMGR

  
  

  Examine your log file of concurrent application for more information.

  Make sure that you pass arguments in the correct format.

  Post: WARNING: mail_queue_enter: create file maildrop / 379309.437: permission denied

  Please guide me to solve this problem.

  Concerning

  Kumar V

  Dear Kumar,

  I suggest you to check the FND_NODES table

  1) connect to SQLPLUS as the APPS user and execute the following statement:

  Select CONCURRENT_QUEUE_NAME in the FND_CONCURRENT_QUEUES where CONCURRENT_QUEUE_NAME like '% FNDSM ';

  (2) If you have found that FND_NODES table with entries incorrect node (old node from the Source Instance), and then run the query to clean below

  EXEC FND_CONC_CLONE. SETUP_CLEAN;
  COMMIT;

  (3) then run AutoConfig on all stages, firstly on the DB layer then APPS and webtiers levels to repopulate the necessary system tables,

  and make sure that you are now able to see the correct entries in the FND_NODES table and start the application services.

  Kind regards

  S27

• Abort ABOVE empty shared pool?

  Hello
  When I run the command alter system shared_pool RAS, oracle empty the memory of shared pool for swap space, everyone can interpret details on alter RAS shared_pool system?

  Oracle is not aware of the Swap space. It only calls the operating system to affect the SGA at the start. Even when you use SGA_TARGET, Oracle scales components of memory (db_cache_size, shared_pool_size etc.) within the SGA.
  It's the BONE following total memory usage. It's the OS that can swap parts of a text of process or the data area or the SGA to the Swap space.

  The shared pool is under control of Oracle and Oracle uses to the dictionary Cache and the Cache of bookstores.
  Distribution area of SQLs etc. is made by Oracle in the shared pool "apparently fixed.

  If part of the SGA or a background process or a process of shadow was exchanged on the disk, in theory, Oracle do not know or care. Of course performance will be affected when processing / SGA are exchanged to and from the disk.

• (2003 server) error 2019: the server was unable to allocate from the system non-paged pool because the pool was empty

  Hello

  I have a Windows 2003 server and get error (Server 2003) 2019: the server was unable to allocate from the system non-paged pool because the pool was empty.

  If anyone has encountered this error and has an instruction step by step to solve this problem please let me know.

  appreciate the help!

  Sincerely,

  Riaz

  This issue is beyond the scope of this site (for consumers) and to be sure, you get the best (and fastest) reply, we have to ask either on Technet (for IT Pro) or MSDN (for developers)
  *

  http://social.technet.Microsoft.com/forums/en-us/home s/fr-U.S./Accueil
  http://social.msdn.Microsoft.com/Forum
  
  
  If you give us a link to the new thread we can point to some resources it

• Creates a new pool, the inventory of the pool is empty

  Hello!

  I wonder how to start troubleshooting:

  I used the view for some time now. Created pools and have little work on production level.

  A few days ago, I created a new pool of but the inventory for this pool is empty!

  There is no error message in the event, nothing, it like sitting doing nothing once the pool is created.

  in vCenter, it creates not the folder to the location where the workstations must be, but nothing more, the folder is empty.

  There is no error message when creating the pool.

  I'm using vmware view 5.1.2.

  Any ideas what I can do now?

  Thank you in advance!

  I've done so far:

  to restart the services.

  * Restart vcenter.

  * tried to use another image and photo Flash.

  * created pool with different ID and name.

  * tried to place desktop to another storage.

  * check that the pool is selected

  * check that the pool is available

  * pool is located on provisions in case of error (tested without this also)

  * pool is an automated pool, floating assignment, vCenter (linked clone)

  I've seen similar behavior before, but can't remember the KB, I used to solve; However, the recommended solution was a reboot of the servers connection and vCenter.  Not sure if this is the same problem and I noticed that you mentioned that you restarted vCenter and bounced from services, but wasn't sure if you restarted your server connection.

• question related to the shared pool

  Hi Experts,

  Version of DB - Oracle Database 11g Enterprise Edition Release 11.2.0.1.0

  OS - Windows 7

  (installed on my laptop)

  Just started reading concepts DBA. I had a few questions. Please explain indetail/short ;-).

  (1) can we see the size of the Cache of the library and Cache data dictionary which are internal units of the Shared pool.
  (2) one of the advantages of the package is - when we invoke a single method, oracle loads the whole package into the buffer and for subsequent calls, it will not go to the db files. Here the buffer means library Cache. My understanding is correct.
  (3) I am able to see the two parameters shared_pool_size(value =0), shared_pool_reserved_size (value 15099494) to parameter v$. What is the difference between these two parameters.

  
  Thank you very much in advance for your help.

  See you soon,.
  Suri ;-)

  Your questions:

  1 Yes, v$ sgastat

  2 Yes, if your terminology is a little loose.

  3. the parameters described here, content

• hold table in the shared pool

  Hi all)
  
  can I use INVALIDHTOMEH packaze hold table in the shared pool?
  
  http://www.orafaq.com/wiki/Pin_Objects_in_the_Shared_Pool
  
  or how keep in the table of a very intensive use of memory?

  Hello

  If you want a chart updated in cache, you just (re) set with the keyword CACHE. INVALIDHTOMEH package is to pin (unpinning) code, not data.

  Best regards
  Nikolai

• How to increase the size of the shared pool?

  Hello
  
  How can we increase the size of the shared pool?
  
  can I update "shared_pool_size" parameter in the init.ora file?
  
  Or any other way to change?
  
  
  Concerning
  Rajesh

  no need to modify the pfile file, if you use 9i or above versions.

  If your database uses pfile then issue
  SQL > alter system set shared_pool_size = scope = mΘmoire;

  If your database uses spfile then issue
  SQL > alter system set shared_pool_size = scope = both; (to reflect changes made to the next start-up also. otherwise scope = memory will be enough)

  If your 10g database, you can have SGA_TARGET enabled (by default) in this case it is not necessary to change anything.

  If you modify the init.ora file, which will result in the next startup of the database. (means shutdown is required). This isn't average recommeded.

• How to query the current free memory in the shared pool

  Hello
  
  Someone please tell me how to check the current uses of shared pool.
  
  Any query/Tip/document would be appreciated?

  If you have found errors ORA-04030 then it is more likely at the PGA instead of the SGA. If you had problems with the shared pool you would probably see shared pool latch wait events and others.

  For the ORA-04030 errors, depending on your operating system, can be solved by adding more memory to the operating system or to reduce the amount of work that is performed.

  HTH!

• kept in the shared pool.

  How I see the objects kept in the shared pool.

  by query v$ dbobject_cache; _

  OWNER VARCHAR2 (64)
  NAME VARCHAR2 (1000)
  DB_LINK VARCHAR2 (64)
  NAMESPACE VARCHAR2 (28)
  TYPE VARCHAR2 (28)
  NUMBER OF SHARABLE_MEM
  NUMBER OF LOADS
  NUMBER OF EXECUTIONS
  NUMBER OF LOCKS
  NUMBER OF PINS
  KEPT VARCHAR2 (3)
  NUMBER OF CHILD_LATCH
  NUMBER OF RADIATION

• narrowing of the shared pool

  Hi friends, when you browse the documentation I read that "internal adjustment algorithm isn't shrink shared pool when you use EAMA. I want to know if that's all the time or for specific cases. If for all the time, then it can lead to performance and more problem sql, pl/sql etc info will reside.
  
  Please explain to me. Thanks in advance

  Hello
  Yes in the case of the distributed databases, using pfile we can statup dbs with client side pfile as well. See here,
  The location of the file in distributed environments initialization parameter
  The client that allows you to access the database must be able to read the settings of the base initialization file to start instance database. Therefore, always store a file parameter on the computer running the client.

  In undistributed treatment facilities, the computer is running Oracle and the customer. This computer already has the settings file stored on one of its hard drives. In distributed processing facilities, however, local client workstations may administer a database stored on a remote computer. In this configuration, the local client computers must each store a copy of the settings for the corresponding databases file.
  http://download-West.Oracle.com/docs/CD/A87860_01/doc/server.817/a76956/start.htm#6439
  HTH
  Aman...

• Shared pool error in Oracle 10.1.0.5

  Installation: databases 3-node RAC cluster
  
  Version of the OS: RHEL 4.5
  DB version: 10.1.0.5
  Storage: ASM starts for R/C/D files & archivelogs on SAN box
  applications: No. OLTP applications that run on a separate application server
  
  
  We get the error ORA - 04031 SHARED POOL MEMORY. There are three nodes: ud1 UD2 & node3 each running on RHEL AS4 OS. The sga components are not granted automatically, I mean it's not automated sga tuning or resizing. We put each CMS component manuallay when required. All r/c/d files are stored on ASM starts.
  
  Since yesterday evening, we are facing the issue of MEMORY in the SHARED POOL. Many OLTP applications operate at the front end and the load is more on node3. Due to the saturation of the pool shared it affected applications and the use of the CPU on the application server was close to 90%. But the use of the CPU on each node of the rac has been slightly less than 30%. Customer complained about slow performance of applications, and in fact a few user sessions hung up.
  What we found in the alerts log is the error ORA-04031 shared pool. Which was casuing the applications and the problem started to work very slowly. For the workaround, we have increased the size of the SHARED_POOL_SIZE parameter as we emptied the shared pool memory. Now, the requests have been working well. I also observed that there are 454 IDLE sessions in the node3. These sessions will have no impact on performance?
  
  But I don't know if it will be fixed for the future as well. But can anyone suggest me how could I approach to solve this problem permanently?
  I know that we still use 10.1.0.5 release and also one more thing is that the SWAP space in one of the node is 4 GB short compared to the other two nodes of swap space. I can't post you the logs please. What I've observed and I did have posted here.
  
  Any suggestions will be greatly appreciate. Please take some time to help out me.
  
  Kind regards
  Imran khan

  PL see if the troubleshooting steps in MOS Doc 1088239.1 (master Note for diagnosing the ORA-4031) can help you

  HTH
  Srini