Query regarding in-memory DB cache

Hello
I have couple of queries related to the cache management in in-memory DB.
(1) In the article "Writing In-Memory Berkeley DB Applications", it is mentioned that DB->set_cachesize() method shouldn't be used
when the DB is opened in an environment. In a berkeley DB environment containing more than one DB, is there a provision to
control the cache allocated for each DB? Rather, how the cache is managed between multiple DBs?
(2) This is very much related to the above query. For an in-memory DB application with more than one DB (lets say 4), of which 2 DB
uses hash and the rest uses Btree, would there be any penalty in performance?
Appreciate any pointers regarding this.
Thanks
Sundar

Hello,
For in memory applications using a shared environment
all databases share the cache. There is no way to control
the individual cache allocation for each db. Are you
using transactions across the databases? If not one
option might be to not use and environment and then allocate
the cache per database using the database handle.
In the general case I don't think there would be a performance
problem. If you observe a particular problem you can collect/
evaluate the db_stat statistics:
http://download.oracle.com/docs/cd/E17076_02/html/api_reference/CXX/db_stat.html
Thanks,
Sandra

Similar Messages

"In-Memory Database Cache" option for Oracle 10g Enterprise Edition

Hi,
In one of our applications, we are using TimesTen 5.1.24 and Oracle 9i
databases (platform - Solaris 9i).
TimesTen holds application information which needs to be accessed quickly
and Oracle 9i is a master application database.
Now we are looking at an option of migrating from Oracle 9i to Oracle 10g
database. While exploring about Oracle 10g features, came to know about
"In-Memory Database Cache" option for Oracle Enterprise Edition. This made
me to think about using Oracle 10g Enterprise Edition with "In-Memory
Database Cache" option for our application.
Following are the advantages that I could visualize by adopting the
above-mentioned approach:
1. Data reconciliation between Oracle and TimesTen is not required (i.e.
data can be maintained only in Oracle tables and for caching "In-Memory
Database Cache" can be used)
2. Data maintenance is easy and gives one view access to data
I have following queries regarding the above-mentioned solution:
1. What is the difference between "TimesTen In-Memory Database" and
"In-Memory Database Cache" in terms of features and licensing model?
2. Is "In-Memory Database Cache" option integrated with Oracle 10g
installable or a separate installable (i.e. TimesTen installable with only
cache feature)?
3. Is "In-Memory Database Cache" option same as that of "TimesTen Cache
Connect to Oracle" option in TimesTen In-Memory Database?
4. After integrating "In-Memory Database Cache" option with Oracle 10g, data
access will happen only through Oracle sqlplus or OCI calls. Am I right here
in making this statement?
5. Is it possible to cache the result set of a join query in "In-Memory
Database Cache"?
In "Options and Packs" chapter in Oracle documentation
(http://download.oracle.com/docs/cd/B19306_01/license.102/b14199/options.htm
#CIHJJBGA), I encountered the following statement:
"For the purposes of licensing Oracle In-Memory Database Cache, only the
processors on which the TimesTen In-Memory Database component of the
In-Memory Database Cache software is installed and/or running are counted
for the purpose of determining the number of licenses required."
We have servers with the following configuration. Is there a way to get the
count of processors on which the Cache software could be installed and/or
running? Please assist.
Production box with 12 core 2 duo processors (24 cores)
Pre-production box with 8 core 2 duo processors (16 cores)
Development and test box with 2 single chip processors
Development and test box with 4 single chip processors
Development and test box with 6 single chip processors
Thanks & Regards,
Vijay

Hi Vijay,
regarding your questions:
1. What is the difference between "TimesTen In-Memory Database" and
"In-Memory Database Cache" in terms of features and licensing model?
==> Product has just been renamed and integrated better with the Oracle database - Times-Ten == In-Memory-Cache-Database
2. Is "In-Memory Database Cache" option integrated with Oracle 10g
installable or a separate installable (i.e. TimesTen installable with only
cache feature)?
==> Seperate Installation
3. Is "In-Memory Database Cache" option same as that of "TimesTen Cache
Connect to Oracle" option in TimesTen In-Memory Database?
==> Please have a look here: http://www.oracle.com/technology/products/timesten/quickstart/cc_qs_index.html
This explains the differences.
4. After integrating "In-Memory Database Cache" option with Oracle 10g, data
access will happen only through Oracle sqlplus or OCI calls. Am I right here
in making this statement?
==> Please see above mentioned papers
5. Is it possible to cache the result set of a join query in "In-Memory
Database Cache"?
==> Again ... ;-)
Kind regards
Mike

SQL Result Cache vs In-Memory Database Cache

Hi,
can anyone help me to understand the relations and differences between the 11 g new features of SQL Result Cache vs In-Memory Database Cache ?
Thanks

I highly recommend you read the 11g New Features Guide. Here is a sample from it:
h4. 1.11.2.9 Query Result Cache
A separate shared memory pool is now used for storing and retrieving
cached results. Query retrieval from the query result cache is faster
than rerunning the query. Frequently executed queries will see
performance improvements when using the query result cache.
The new query result cache enables explicit caching of results in
database memory. Subsequent queries using the cached results will
experience significant performance improvements.
See Also:
[Oracle Database Performance Tuning Guide|http://download.oracle.com/docs/cd/B28359_01/server.111/b28274/memory.htm#PFGRF10121] for details
[Results Cache Concepts|http://download.oracle.com/docs/cd/B28359_01/server.111/b28274/memory.htm#PFGRF10121|Results Cache Concepts]
HTH!

DB buffer cache vs. SQL query & PL/SQL function result cache

Hi all,
Started preparing for OCA cert. just myself using McGraw Hill's exam guide. Have a question about memory structures.
Actually, DB buffer cache is used to copy e.g. SELECT queries result data blocks, that can be reused by another session (server process).
There is also additional otion - SQL query & PL/SQL function result cache (from 11g), where also stored the results of such queries.
Do they do the same thing or nevertheless there is some difference, different purpose?
thanks in advance...

There is also additional otion - SQL query & PL/SQL function result cache (from 11g), where also stored the results of such queries.Result cache located in shared pool.So it is one component of shared pool.When server process execute query(and if you configured result cache) then result will store in shared pool.Then next execution time run time mechanism will detect and consider using result cache without executing this query(if data was not changed this is happen detection time)
Do they do the same thing or nevertheless there is some difference, different purpose?.Buffer cache and result cache are different things and purpose also,but result cache introduced to improve response time of query in 11g(but such mechanism also implemented in 10g subquery execution,in complex query).In buffer cache holds data blocks but not such results.
Edited by: Chinar on Nov 4, 2011 4:40 AM
(Removing lots of "But" word from sentences :-) )

Query Performance with and without cache

Hi Experts
I have a query that takes 50 seconds to execute without any caching or precalculation.
Once I have run the query in the Portal, any subsequent execution takes about 8 seconds.
I assumed that this was to do with the cache, so I went into RSRT and deleted the Main Memory Cache and the Blob cache, where my queries seemed to be.
I ran the query again and it took 8 seconds.
Does the query cache somewhere else? Maybe on the portal? or on the users local cache? Does anyone have any idea of why the reports are still fast, even though the cache is deleted?
Forum points always awarded for helpful answers!!
Many thanks!
Dave

Hi,
Cached data automatically becomes invalid whenever data in the InfoCube is loaded or purged and when a query is changed or regenerated. Once cached data becomes invalid, the system reverts to the fact table or associated aggregate to pull data for the query You can see the cache settings for all queries in your system using transaction SE16 to view table RSRREPDIR . The CACHEMODE field shows the settings of the individual queries. The numbers in this field correspond to the cache mode settings above.
To set the cache mode on the InfoCube, follow the path Business Information Warehouse Implementation Guide (IMG)>Reporting-Relevant Settings>General Reporting Settings>Global Cache Settings or use transaction SPRO . Setting the cache mode at the InfoCube level establishes a default for each query created from that specific InfoCube.

Memory system cache on windows server 2003 standard 64-bit is too hign

Hi,
I have an issue with one of the server - OS is windows 2003 standard 64 bit. Total memory installed on the server is 16GB. When I go to task manager>performance tab, Total physical memory is 16 GB, available memory is around 500 MB almost all the time,
System cache is greater than 13.5GB. When I take a look at all the processes that are running, and if I sum those memory usage it will be around 2 GB. So all the memory is consumed by system cache. Checked the perfmon > memory> system cache resident
bytes and it is showing greater than 13.5 GB. I have gone through some articles that tells me to use RAMMAP to find which is using more system cache. But RAMMAP is not designed to run with windows 2003 version. Please can you help with a way/tool to find what
is using system cache in windows 2003 server
Thanks in advance
Regards
RJ

It is supposed to do this. Windows can be very aggressive in caching data and code. This data is released as soon as the system needs memory for something else, but when it is unused, the system uses it to cache all sorts of stuff. It utilizes the memory
which would otherwise be unused. Leaving it unused would basically be a waste.
So in other words, nothing is wrong. It is windows which decides to try and be more efficient. As soon as a request for more memory comes in, it just drops whatever is needed from the cache immediately.
This is one of the reasons that in later versions, the memory is reported differently in task manager, because people kept trying to stop the system from caching because they wanted to see more 'free' memory.

Query regarding updation thru a Procedure

Hi,I have a query regarding updation.
1.I invoke a procedure in Oracle called submit thru my Java application.
The submit procedure saves the XML data in the database
and displays this data in a Front End GUI.
2. Now,I make a change in my Java application by adding new elements to the same row.This row now contains additional XML elements.
I would like to display the new row with the new elements in the GUI.
What is a better option for doing the above?
1.Delete the row being shown,save the new row with the changes in the database,and re display it?
2.Or,Update the row dynamically and refresh?
Any suggestions
Thanks,

Hi,I have a query regarding updation.
1.I invoke a procedure in Oracle called submit thru
my Java application.
The submit procedure saves the XML data in the
database
and displays this data in a Front End GUI.
2. Now,I make a change in my Java application by
adding new elements to the same row.This row now
contains additional XML elements.
I would like to display the new row with the new
elements in the GUI.
What is a better option for doing the above?
1.Delete the row being shown,save the new row with
the changes in the database,and re display it?
2.Or,Update the row dynamically and refresh?
Any suggestions
Thanks,If you delete (it seems to me yours this process is regular and frequent) and re insert the new updated one record then High water mark will cause to scan yours table which may cause to degrade the performance.AFAIK you should go with update.But hold down dont implement it as i suggested lets see what are others solution here which may be more precious then mine.
Khurram

A query regarding synchronised functions, using shared object

Hi all.
I have this little query, regarding the functions that are synchronised, based on accessing the lock to the object, which is being used for synchronizing.
Ok, I will clear myself with the following example :
class First
int a;
static int b;
public void func_one()
synchronized((Integer) a)
{ // function logic
} // End of func_one
public void func_two()
synchronized((Integer) b)
{ / function logic
} // End of func_two
public static void func_three()
synchronized((Integer) a)
{ // function logic
} // End of func_three, WHICH IS ACTUALLY NOT ALLOWED,
// just written here for completeness.
public static void func_four()
synchronized((Integer) b)
{ / function logic
} // End of func_four
First obj1 = new First();
First obj2 = new First();
Note that the four functions are different on the following criteria :
a) Whether the function is static or non-static.
b) Whether the object on which synchronization is based is a static, or a non-static member of the class.
Now, first my-thoughts; kindly correct me if I am wrong :
a) In case 1, we have a non-static function, synchronized on a non-static object. Thus, effectively, there is no-synchronisation, since in case obj1 and obj2 happen to call the func_one at the same time, obj1 will obtain lock for obj1.a; and obj2 will obtain lock to obj2.a; and both can go inside the supposed-to-be-synchronized-function-but-actually-is-not merrily.
Kindly correct me I am wrong anywhere in the above.
b) In case 2, we have a non-static function, synchronized on a static object. Here, again if obj1, and obj2 happen to call the function at the same time, obj1 will try to obtain lock for obj1.a; while obj2 will try to obtain lock for obj2.a. However, since obj1.a and obj2.a are the same, thus we will indeed obtain sychronisation.
Kindly correct me I am wrong anywhere in the above.
c) In case 3, we have a static function , synchronized on a non-static object. However, Java does not allow functions of this type, so we may safely move forward.
d) In case 4, we have a static function, synchronized on a static object.
Here, again if obj1, and obj2 happen to call the function at the same time, obj1 will try to obtain lock for obj1.a; while obj2 will try to obtain lock for obj2.a. However, since obj1.a and obj2.a are the same, thus we will indeed obtain sychronisation. But we are only partly done for this case.
First, Kindly correct me I am wrong anywhere in the above.
Now, I have a query : what happens if the call is made in a classically static manner, i.e. using the statement "First.func_four;".
Another query : so far we have been assuming that the only objects contending for the synchronized function are obj1, and obj2, in a single thread. Now, consider this, suppose we have the same reference obj1, in two threads, and the call "obj1.func_four;" happens to occur at the same time from each of these threads. Thus, we have obj1 rying to obtain lock for obj1.a; and again obj1 trying to obtain lock for obj1.a, which are the same locks. So, if obj1.a of the first thread obtains the lock, then it will enter the function no-doubt, but the call from the second thread will also succeed. Thus, effectively, our synchronisation is broken.
Or am I being dumb ?
Looking forward to replies..
Ashutosh

a) In case 1, we have a non-static function, synchronized on a non-static object. Thus, effectively, there is no-synchronisationThere is no synchronization between distinct First objects, but that's what you specified. Apart from the coding bug noted below, there would be synchronization between different threads using the same instance of First.
b) In case 2, we have a non-static function, synchronized on a static object. Here, again if obj1, and obj2 happen to call the function at the same time, obj1 will try to obtain lock for obj1.a; while obj2 will try to obtain lock for obj2.a.obj1/2 don't call methods or try to obtain locks. The two different threads do that. And you mean First.b, not obj1.b and obj2.b, but see also below.
d) In case 4, we have a static function, synchronized on a static object. Here, again if obj1, and obj2 happen to call the function at the same time, obj1 will try to obtain lock for obj1.a; while obj2 will try to obtain lock for obj2.a.Again, obj1/2 don't call methods or try to obtain locks. The two different threads do that. And again, you mean First.b. obj1.b and obj2.b are the same as First.b. Does that make it clearer?
Now, I have a query : what happens if the call is made in a classically static manner, i.e. using the statement "First.func_four;".That's what happens in any case whether you write obj1.func_four(), obj2.func)four(), or First.func_four(). All these are identical when func_four(0 is static.
Now, consider this, suppose we have the same reference obj1, in two threads, and the call "obj1.func_four;" happens to occur at the same time from each of these threads. Thus, we have obj1 rying to obtain lock for obj1.aNo we don't, we have a thread trying to obtain the lock on First.b.
and again obj1 trying to obtain lock for obj1.aYou mean obj2 and First.b, but obj2 doesn't obtain the lock, the thread does.
which are the same locks. So, if obj1.a of the first thread obtains the lock, then it will enter the function no-doubt, but the call from the second thread will also succeed.Of course it won't. Your reasoning here makes zero sense..Once First.b is locked it is locked. End of story.
Thus, effectively, our synchronisation is broken.No it isn't. The second thread will wait on the same First.b object that the first thread has locked.
However in any case you have a much bigger problem here. You're autoboxing your local 'int' variable to a possibly brand-new Integer object every call, so there may be no synchronization at all.
You need:
Object a = new Object();
static Object b = new Object();

Query regarding the conversion of DME file in MT940 format.

Hello Experts,
I have a query regarding the generation of MT940 file after generating the payment file from other DME tree.
After completion of payment run, my payment file is generated in the DME format which is according to the DME tree.
I want to convert the DME file (which is generated via F110) from existing format to the standard MT940 format.
Is there any standard program which converts the DME file to MT940. If so, please inform me as early.
I have tried to upload the DME file in FF.5 transaction, but it is not allowing me to convert the file in MT940 structure.
Or please inform the steps how i can convert the file .
Awaiting for your inputs.
Thanks in advance

Hi Zareena.
I would like to suggest,
SX_OBJECT_CONVERT_RAW_TXT.
Hope that's usefull.
Good Luck & Regards.
Harsh Dave

Query regarding the data type for fetcing records from multiple ODS tables

hey guys;
i have a query regarding the data type for fetcing records from multiple ODS tables.
if i have 2 table with a same column name then in the datatype under parent row node i cant add 2 nodes with the same name.
can any one help with some suggestion.

Hi Mudit,
One option would be to go as mentioned by Padamja , prefxing the table name to the column name or another would be to use the AS keyoword in your SQL statement.
AS is used to rename the column name when data is being selected from your DB.
So, the query Select ename as empname from emptable will return the data with column name as empname.
Regards,
Bhavesh

Query regarding Cluster nodes in CC

Hi Experts,
We have a query regarding the cluster nodes available in the CC monitoring.
Can two nodes of a same channel can poll at the same time?
Kindly suggest what should be done to make a specific cluster node of a CC polls at a particular time.
Thanks
Suganya.

Hi,
There is an answered thread on this
Processing in Multiple Cluster Nodes
Regards,
Manjusha

Query regarding G/LAccounts in psoting

Hi Experts,
I have one query regarding PCP0.
After executing PCP0,If We double click on the posting document we can see the number of G/L accounts in that posting Document.If we double click on each G/L Account it shows all the revision information indetail for all payments cumulated into that particular G/L Account.
Some of the G/L's are appearing as single line in the posting document and if we double click for the revision information it is showing all the Wagetypes with personnel numbers and the total of each wagetype.
Some of the G/L's we can see Multiple times for each individual.
Can any one please explain where does we set up the the revision information for the G/L Accounts .
Appreciate If anyone can help to know this information.
Thanks & Regards,
Sandhya.

Hi Gopal,
Counting class are assigned to the Periodic work Schedule 1 to 9 are just arbitart sequence numbers and have no meaning in general they are used for linking Pweriodic Work schedules with differences.
You can use the class for absence and attendance counting to specify different methods of counting according to the period work schedule.
They have no other meaning apart from that.
Thanks and Regards
Swati

Query regarding the fields details in particular form for all the users in

Dear All,
I have one query regarding the fields details in particular form for all the users in company.
Let take an exapmle if i had created Purchase Order having fields in content tab as 1.Item No. 2.Quantity 3.Unit Proce 4.Total 5. Location.
While Login in User manager i set these fields only for Purchase order , but when i login from other user and open the similar purchase order the defaults fields are also seen including above 4 fieds .
Now my question is how to set the User choice fiels for the particular form that are common to all users.
Means whenever i login in any user and opens the same document the same fields should be seen....Thanksssss.........

You have to login with each and every user and do the Form Settings of every forms, so that all the forms look same for all the users.
This is a manual job and you have do do it with every user login.
Alternately, you can try out this link that explains
[How to Copy One Screen Layout to Another User|http://www.sbonotes.com/2008/03/how-to-copy-one-screen-layout-to.html]

Query regarding App V Deployment - (Deploying DriverMSI in App - V)

Hi All,
This is my query regarding deployment of a driver MSI using App V. I have tried sequencing "NMap software" which has Kernel driver as service. I have separated the Kernel driver and wrapped in an MSI and tried deploying the Kernel Driver MSI using
the DeploymentConfig.xml file but its not happening.
I have tried writing script in DeploymentConfig.xml in AddPackage Tag as shown in the below commands where I have added driver MSI in sequenced package, and tried deploying the DeploymentConfig.xml in powershell during Add-Package event but the driver
MSI is not getting installed in Client machine.
<AddPackage>
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        <Wait RollbackOnError="true" Timeout="30"/>
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        <Path>msiexec.exe</Path>
        <Arguments>/x {4BAB3E93-716E-4E18-90F0-1DA3876CBEB6} /qn</Arguments>
        <Wait RollbackOnError="false" Timeout="60"/>
      </RemovePackage>
    </MachineScripts>
The other way I have tried is writing a vbscript for installing the driver MSI, added the vbs in sequenced package and called the same in DeploymentConfig.xml but no luck.Please find the command below.
<!--
    <MachineScripts>
      <PublishPackage>
        <Path>wscript.exe</Path>
        <Arguments>[{AppVPackageRoot}]\..\Scripts\NMap_Driver_Install.vbs -guid 7c21d1e9-0fc4-4e56-b7bf-49e54d6e523f -name Insecure_Nmap_6.4_APPV</Arguments>
        <Wait RollbackOnError="true" Timeout="30"/>
      </PublishPackage>
      <UnpublishPackage>
        <Path>\\server\share\barfoo.exe</Path>
        <Arguments>-WithArgs</Arguments>
        <Wait RollbackOnError="false" Timeout="30"/>
      </UnpublishPackage>
Please suggest any method to make this successful or kindly let me know if there is any mistake in the script.
Thanks in advance,
Vivek V

Hi Nicke,
These are the following methods and steps that I have performed for installing Driver MSi.
Method 1:
1. Included the driver MSI in Package Files Tab in sequencer and called the same MSI in DeploymentConfig.xml using the below script.
<AddPackage>
        <Path>msiexec.exe</Path>
        <Arguments>/i Nmap_KernelDriver.msi /qb /l*v c:\windows\system32\LogFiles\Install_Nmap.log</Arguments>
        <Wait RollbackOnError="true" Timeout="30"/>
      </AddPackage>
      <RemovePackage>
        <Path>msiexec.exe</Path>
        <Arguments>/x {4BAB3E93-716E-4E18-90F0-1DA3876CBEB6} /qn</Arguments>
        <Wait RollbackOnError="false" Timeout="60"/>
      </RemovePackage>
    </MachineScripts>
2. After the above steps, deployed the AppV package along with DeploymentConfig.xml in App V Client using the commands mentioned below.
Set-ExecutionPolicy -Unrestricted
Import-module Appvclient
Set-AppVClientConfiguration -EnablePackageScripts 1
Add-AppvClientPackage -Path "Path of the AppV file" -DynamicDeploymentConfig "Path of DeploymentConfig.xml"
after trying the above steps the driver MSI is not getting installed.
Method 2:
1. Included the driver MSI and a VBS file(VBS contains script for calling the driverMSI)in Package Files tab in sequencer. Commandlines has been provided calling the vbs file in DeploymetConfig.xml as mentioned below.
<!--
    <MachineScripts>
      <PublishPackage>
        <Path>wscript.exe</Path>
        <Arguments>[{AppVPackageRoot}]\..\Scripts\NMap_Driver_Install.vbs -guid 7c21d1e9-0fc4-4e56-b7bf-49e54d6e523f -name Insecure_Nmap_6.4_APPV</Arguments>
        <Wait RollbackOnError="true" Timeout="30"/>
      </PublishPackage>
      <UnpublishPackage>
        <Path>\\server\share\barfoo.exe</Path>
        <Arguments>-WithArgs</Arguments>
        <Wait RollbackOnError="false" Timeout="30"/>
      </UnpublishPackage>
2. after executing the above steps, tried deploying the AppV file along with DeploymentConfig.xml using the commands mentioned below,
Set-ExecutionPolicy -Unrestricted
Import-module Appvclient
Set-AppVClientConfiguration -EnablePackageScripts 1
Add-AppvClientPackage -Path "Path of the AppV file" -DynamicDeploymentConfig "Path of DeploymentConfig.xml"
evenafter trying the above methods the driver MSI is not getting installed. Hope you can understand my explanations above.
Regards,
Vivek V

Query regarding Freight

Hi! Gurus,
I am having a query regarding Freight .
Consider PO having 100 Quantity and freight applicable WRT quantity Condition
type FRC1.Rs 1 /1 Quantity.
Freight amount = Rs 100.
Consider 5 Good Receipt WRT purchase order.
GR1- 20 Quantity ,Freight = 20 RS
GR2 -20 Quantity ,Freight = 20 Rs
GR3- 20 Quantity ,Freight = 20 RS
GR4 -20 Quantity ,Freight = 20 Rs
GR5- 20 Quantity ,Freight = 20 RS
Well my question is can i do miro with respect to delivery note(GR1,GR2,GR3,GR4,GR5) wherein i will get only freight amount that i have to pay to vendor
secondly if i do MIRO WRT purchase order ,
I getting 5 GR line items and 1item Rs 100 Freight.
We require 5 GR line item and 5 Freight items.
How this can be done.
Thanks and Regards,
shailesh

If you vendor is sending you a five invoice with each having the freight then post invoice against the delivery note so you will get only that GR qty with freight amount.
but if you get 5 GR and 1 invoice then you can not post separately

Query regarding in-memory DB cache

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