How to Enable Result Cache in 11g XE ?

Does anyone know how to enable the result cache in 11g XE?
I've tired startup/shut down immediate with various ALTER SYSTEM commands (see below) but result_cache_max_size still defaults to zero when the database comes back up.
ALTER SYSTEM SET result_cache_max_size = 2M SCOPE = SPFILE;
ALTER SYSTEM SET result_cache_max_size = 2M SCOPE = BOTH;
ALTER SYSTEM RESET result_cache_max_size SCOPE = SPFILE SID='*';
Any advice would be helpful.
Thanks

In the [Licensing document|http://download.oracle.com/docs/cd/E11882_01/license.112/e10594/editions.htm#CJACGHEB] , in the 'performance' section of the table, the result cache is only available on Enterprise and not Standard, so I wouldn't expect it to work in Express Edition

Similar Messages

How to enable DVM cache policy in soa suite 11G

Hello,
Can someone describe how to enable DVM cache policy in soa suite 11G?. Also how can i configure the cache policy to load values to cache at server startup? I have very large DVM which i want to load to cache for faster access.
Thanks in advance.

Hi,
DVM cache policy is lazy load. there is no option to preload the cache with server startup currently. However this would be affecting only the first request the susequent requests are serviced from cache.
HTH..
appologies for reaching on this late.
regards,
Jitendra

Enabling result cache

Hi,
I am trying to enable result cache feature at Oracle 11g R2 server. I am following the below steps but everytime the cache status is coming DISABLED. Please help me to correct it
1. I am setting the RESULT_CACHE_MAX_SIZE and RESULT_CACHE_MODE as below. Memory_Target is 1232M, so I chose to allocate 200M for result cache.
ALTER SYSTEM SET RESULT_CACHE_MODE=FORCE
System altered.
ALTER SYSTEM SET RESULT_CACHE_MAX_SIZE=200M
System altered.2. I am restarting the database
SHUTDOWN IMMEDIATE
STARTUP
3. I am querying the result cache status
SELECT DBMS_RESULT_CACHE.STATUS FROM DUAL
STATUS
DISABLEDI have configured other database servers for cache and its working fine. But i am not able to sort out what is going wrong in above scripts. Please help me if i am missing out some step.
Thanks

select * from v$version;you need "Enterprise Edition" http://docs.oracle.com/cd/B28359_01/license.111/b28287/editions.htm
for EE check this:
http://psoug.org/reference/dbms_result_cache.html
http://www.oracle.com/technetwork/articles/datawarehouse/vallath-resultcache-rac-284280.html
http://www.oracle-developer.net/display.php?id=503

How to enable password caching( mine was disabled by accident), is this mozilla or windows ?

cant enable password caching, dont no if this is a firefox issue or windows xp

''' "... password list appeared in lower right hand corner of screen ..." '''
Firefox doesn't display preferences or passwords there. Sorry, I have no idea what that was or how to fix it.
Do you have an Firefox Addons installed, that might have provided that display?

How to enable invalidation cache in struts portlet?

Dear Friends,
I am in need of implementing invalidation based caching in my pdk struts portlet application. The sample in the jpdk is for normal pdk portlets (not struts.) and the code did not work for my application. Plz help.
Many thanks,
Alvi

In the [Licensing document|http://download.oracle.com/docs/cd/E11882_01/license.112/e10594/editions.htm#CJACGHEB] , in the 'performance' section of the table, the result cache is only available on Enterprise and not Standard, so I wouldn't expect it to work in Express Edition

How to enable SSO for ADF 11g application

Hi All,
I am new to ADF 11g. I need to enable SSO authentication for a ADF 11g application.
Please let me know if we have any document to follow to perform the configuration.
Thanks
Sai

Check this out
http://download.oracle.com/docs/cd/E14571_01/doc.1111/e15478/opssadf.htm
-Arun

PL/SQL Function Result Cache?

Hi all,
As we know, there's a new feature in 11g, called 'result cache', this 'result cache' can be shared throughout the whole instance, but if I got it right, only sql query result and function return value are cached, right? how about the store procedure, I mean, procedure also has its 'return value'--the output parameter, could it benefit from this new feature?
Another question is, if my PL/SQL Function just retrieves the table and returns the result without any complicated calculation, is it necessary to enable the 'result cache' mechanism on this Function? because we already have 'db buffer cache' if the only thing we do is to query tables.
Many thanks.

Hi Morven,
As of now, PL/SQL Result cache feature is only enabled for stored functions and not for procedures. This is due to the objectives they achieve. Functions are usually computative and procedures are for logic implementation.
And for enabling result caching feature for a function, you are the better judge as u can test the performance in both the case. But, i would support enabling the cache because oracle 11g provides Cache as a different SGA component. db_buffer_cache will also be used for buffering other data blocks and not the result sets.
Hope my explanation is fine.

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 :-) )

Result Caching in OSB

We are planning to implement OSB result caching feature in our project.We did the following to do a POC.
1.Created a DBAdapter to select from a table and created a BS out of that.
2.Enabled Result caching with TTL for 5 mins.
3.Invoked the BS from a PS.
4.Tested the PS by invoking from test cosnole.
5.Response was received as expected.
6.Changed the value in the table and tested again within 5 mins.
7.New values were returned instead of the ones in the cache.
What might be the problem?Should it not return the old value from table?

Each cached result is uniquely identified by a cache key that is made up of the ServiceRef (the unique identifier for the service which is the fully qualified path name of the service), the operation being invoked, and a cache token String. The cache token helps to uniquely identify a single cache result among other cache results for one business service. You control the value of the cache token. You can set the cache token either by configuring the Cache Token expression in the Result Caching configuration for the business service or by using the cache-token metadata element in the $transportMetaData using the proxy service message flow. If there is no cache-token defined then caching may not work as expected.
Please refer -
35.7.5 Improving Performance by Caching Business Service Results at http://download.oracle.com/docs/cd/E17904_01/doc.1111/e15867/configuringandusingservices.htm#CHDDCGEE
http://blogs.oracle.com/MarkSmith/2011/03/osb_and_coherence_integration_1.html
Regards,
Anuj

Result cache doubt

what is the difference if i write relies_on clause or if i dont write it, technically please explain what exactly is the difference ??
create or replace function tax (i in varchar2)
return number
result_cache
is
begin
return i*0.08 ;
end;
create or replace function tax (i in varchar2)
return number
result_cache relies_on (emp)
is
begin
return i*0.08 ;
end;

http://docs.oracle.com/cd/B28359_01/appdev.111/b28370/function.htm#i34368
RELIES_ON
Specifies the data sources on which the results of a function depend. For more information, see Using the PL/SQL Function Result Cache. http://docs.oracle.com/cd/B28359_01/appdev.111/b28370/subprograms.htm#BABFHACJ
To enable result-caching for a function, use the RESULT_CACHE clause. When a result-cached function is invoked, the system checks the cache. If the cache contains the result from a previous call to the function with the same parameter values, the system returns the cached result to the invoker and does not reexecute the function body. If the cache does not contain the result, the system executes the function body and adds the result (for these parameter values) to the cache before returning control to the invoker.Not sure why are you talking about invalidated data, result_cache just invoked result from a previous call to the function if it exists, if not it executes the function body.
The clause relies_on just specifies the data sources on which the results of a function depend.
am i missing something??

Result cache refresh at business service (OSB) ?

Hi,
I have configured my business service at osb side to cache the result. My business service is pointing JCA- dbadapter which is calling a stored procedure.
Is there any way to update/refresh the cache if there are any changes in the corresponding tables which the store procedure is using. I have googled a lot on this but have found nothing on it.
Any help would be very much appreciated.

Is there any way to update/refresh the cache if there are any changes in the corresponding tables which the store procedure is using. I have googled a lot on this but have found nothing onAFAIK, OSB does not provide any functionality to refresh the cache without hitting the backend sevice.
The result caching in Oracle Service Bus is available for Business Services. When you enable result caching, the Business Service will not reach the backend service and the response will come from the cache entry. This entry can expire and if the entry is expired, the next service call will indeed reach the backend service and update the cache entry.
Each cached result has its own TTL. When a TTL is reached, Oracle Coherence flushes that individual cached result.
It would be better if you can raise a support ticket and ask for enhancement.
Regards,
Abhinav Gupta

Oracle 11g result cache and TimesTen

Oracle 11g has introduced the concept of result cache whereby the result set of frequently executed queries are stored in cache and used later when other users request the same query. This is different from caching the data blocks and exceuting the query over and over again.
Tom Kyte calls this just-in-time materialized view whereby the results are dynamically evaluated without DBA intervention
http://www.oracle.com/technology/oramag/oracle/07-sep/o57asktom.html
My point is that in view of utilities like result_cache and possible use of Solid State Disks in Oracle to speed up physical I/O etc is there any need for a product like TimesTen? It sounds to me that it may just asdd another layer of complexity?

Oracle result cache ia a useful tool but it is distinctly different from TimesTen. My understanding of Oracle's result cache is caching results set for seldom changing data like look up tables (currencies ID/code), reference data that does not change often (list of counter parties) etc. It would be pointless for caching result set where the underlying data changes frequently.
There is also another argument for SQL result cache in that if you are hitting high on your use of CPUs and you have enough of memory then you can cache some of the results set thus saving on your CPU cycles.
Considering the arguments about hard wired RDBMS and Solid State Disks (SSD), we can talk about it all day but having SSD does not eliminate the optimiser consideration for physical I/O. A table scan is a table scan whether data resides on SCSI or SSD disk. SSD will be faster but we are still performing physical IOs.
With regard to TimesTen, the product positioning is different. TimesTen is closer to middletier than Oracle. It is designed to work closely to application layer whereas Oracle has much wider purpose. For real time response and moderate volumes there is no way one can substitue TimesTen with any hard wired RDBMS. The request for result cache has been around for sometime. In areas like program trading and market data where the underlying data changes rapidly, TimesTen will come very handy as the data is real time/transient and the calculations have to be done almost realtime, with least complications from the execution engine. I fail to see how one can deploy result cache in this scenario. Because of the underlying change of data, Oracle will be forced to calculate the queries almost everytime and the result cache will be just wasted.
Hope this helps,
Mich

How to enable users change password in obiee 11g?

Is there anyone know how to enable users change password in obiee 11g?
And I have tried the method in obiee 10g, bu it didn't work.
Any help would be appreciate.

As per I understand your requirement,
In your Dashboard create a Presentation variable which receives the value of year you select.
Now in your analysis, select the year column along with all the measures you want (Actual, plan, Forecast, and what-if, etc).
Create a filter on Year column and convert it into SQL. Put the condition as:
"Year" BETWEEN @{Presentaion_Variable} - 1 AND @{Presentation_Variable}
You will get the result for selected year and the previous year.
Hope it helps..
Regards,
A.K.

Oracle 11g/R2 Query Result Cache - Incremental Update

Hi,
In Oracle 11g/R2, I created replica of HR.Employees table & executed the following statement (+Although using SUM() function is non-logical in this case, but just testifying the result+)
STEP - 1
SELECT      /+ RESULT_CACHE */ employee_id, first_name, last_name, SUM(salary)*
FROM           HR.Employees_copy
WHERE      department_id = 20
GROUP BY      employee_id, first_name, last_name;
EMPLOYEE_ID      FIRST_NAME LAST_NAME     SUM(SALARY)
202           Pat           Fay          6000
201           Michael           Hartstein     13000
Elapsed: 00:00:00.01
Execution Plan
Plan hash value: 3837552314
| Id | Operation           | Name | Rows | Bytes | Cost (%CPU)| Time |
| 0 | SELECT STATEMENT      | | 2 | 130 | 4 (25)| 00:00:01 |
| 1 | RESULT CACHE      | 3acbj133x8qkq8f8m7zm0br3mu | | | | |
| 2 | HASH GROUP BY      | | 2 | 130 | 4 (25)| 00:00:01 |
|* 3 | TABLE ACCESS FULL     | EMPLOYEES_COPY | 2 | 130 | 3 (0)| 00:00:01 |
--------------------------------------------------------------------------------------------------     Statistics
0 recursive calls
0 db block gets
0 consistent gets
0 physical reads
0 redo size
*690* bytes sent via SQL*Net to client
416 bytes received via SQL*Net from client
2 SQL*Net roundtrips to/from client
0 sorts (memory)
0 sorts (disk)
2 rows processed
STEP - 2
INSERT INTO HR.employees_copy
VALUES(200, 'Dummy', 'User','[email protected]',NULL, sysdate, 'MANAGER',5000, NULL,NULL,20);
STEP - 3
SELECT      /*+ RESULT_CACHE */ employee_id, first_name, last_name, SUM(salary)
FROM           HR.Employees_copy
WHERE      department_id = 20
GROUP BY      employee_id, first_name, last_name;
EMPLOYEE_ID      FIRST_NAME LAST_NAME SUM(SALARY)
202      Pat      Fay      6000
201      Michael      Hartstein      13000
200      Dummy User      5000
Elapsed: 00:00:00.03
Execution Plan
Plan hash value: 3837552314
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
| 0 | SELECT STATEMENT |          | 3 | 195 | 4 (25)| 00:00:01 |
| 1 | RESULT CACHE | 3acbj133x8qkq8f8m7zm0br3mu | | | | |
| 2 | HASH GROUP BY | | 3 | 195 | 4 (25)| 00:00:01 |
|* 3 | TABLE ACCESS FULL| EMPLOYEES_COPY | 3 | 195 | 3 (0)| 00:00:01 |
     Statistics
0 recursive calls
0 db block gets
4 consistent gets
0 physical reads
0 redo size
*714* bytes sent via SQL*Net to client
416 bytes received via SQL*Net from client
2 SQL*Net roundtrips to/from client
0 sorts (memory)
0 sorts (disk)
3 rows processed
In the execution plan of STEP-3, against ID-1 the operation RESULT CACHE is shown which shows the result has been retrieved directly from Result cache. Does this mean that Oracle Server has Incrementally Retrieved the resultset?
Because, before the execution of STEP-2, the cache contained only 2 records. Then 1 record was inserted but after STEP-3, a total of 3 records was returned from cache. Does this mean that newly inserted row is retrieved from database and merged to the cached result of STEP-1?
If Oracle server has incrementally retrieved and merged newly inserted record, what mechanism is being used by the Oracle to do so?
Regards,
Wasif
Edited by: 965300 on Oct 15, 2012 12:25 AM

965300 wrote:
Hi,
In Oracle 11g/R2, I created replica of HR.Employees table & executed the following statement (+Although using SUM() function is non-logical in this case, but just testifying the result+)
STEP - 1
SELECT      /+ RESULT_CACHE */ employee_id, first_name, last_name, SUM(salary)*
FROM           HR.Employees_copy
WHERE      department_id = 20
GROUP BY      employee_id, first_name, last_name;
EMPLOYEE_ID      FIRST_NAME LAST_NAME     SUM(SALARY)
202           Pat           Fay          6000
201           Michael           Hartstein     13000
Elapsed: 00:00:00.01
Execution Plan
Plan hash value: 3837552314
| Id | Operation           | Name | Rows | Bytes | Cost (%CPU)| Time |
| 0 | SELECT STATEMENT      | | 2 | 130 | 4 (25)| 00:00:01 |
| 1 | RESULT CACHE      | 3acbj133x8qkq8f8m7zm0br3mu | | | | |
| 2 | HASH GROUP BY      | | 2 | 130 | 4 (25)| 00:00:01 |
|* 3 | TABLE ACCESS FULL     | EMPLOYEES_COPY | 2 | 130 | 3 (0)| 00:00:01 |
--------------------------------------------------------------------------------------------------     Statistics
0 recursive calls
0 db block gets
0 consistent gets
0 physical reads
0 redo size
*690* bytes sent via SQL*Net to client
416 bytes received via SQL*Net from client
2 SQL*Net roundtrips to/from client
0 sorts (memory)
0 sorts (disk)
2 rows processed
STEP - 2
INSERT INTO HR.employees_copy
VALUES(200, 'Dummy', 'User','[email protected]',NULL, sysdate, 'MANAGER',5000, NULL,NULL,20);
STEP - 3
SELECT      /*+ RESULT_CACHE */ employee_id, first_name, last_name, SUM(salary)
FROM           HR.Employees_copy
WHERE      department_id = 20
GROUP BY      employee_id, first_name, last_name;
EMPLOYEE_ID      FIRST_NAME LAST_NAME SUM(SALARY)
202      Pat      Fay      6000
201      Michael      Hartstein      13000
200      Dummy User      5000
Elapsed: 00:00:00.03
Execution Plan
Plan hash value: 3837552314
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
| 0 | SELECT STATEMENT |          | 3 | 195 | 4 (25)| 00:00:01 |
| 1 | RESULT CACHE | 3acbj133x8qkq8f8m7zm0br3mu | | | | |
| 2 | HASH GROUP BY | | 3 | 195 | 4 (25)| 00:00:01 |
|* 3 | TABLE ACCESS FULL| EMPLOYEES_COPY | 3 | 195 | 3 (0)| 00:00:01 |
     Statistics
0 recursive calls
0 db block gets
4 consistent gets
0 physical reads
0 redo size
*714* bytes sent via SQL*Net to client
416 bytes received via SQL*Net from client
2 SQL*Net roundtrips to/from client
0 sorts (memory)
0 sorts (disk)
3 rows processed
In the execution plan of STEP-3, against ID-1 the operation RESULT CACHE is shown which shows the result has been retrieved directly from Result cache. Does this mean that Oracle Server has Incrementally Retrieved the resultset?
Because, before the execution of STEP-2, the cache contained only 2 records. Then 1 record was inserted but after STEP-3, a total of 3 records was returned from cache. Does this mean that newly inserted row is retrieved from database and merged to the cached result of STEP-1?
If Oracle server has incrementally retrieved and merged newly inserted record, what mechanism is being used by the Oracle to do so?
Regards,
Wasif
Edited by: 965300 on Oct 15, 2012 12:25 AMNo, the RESULT CACHE operation doesn't necessarily mean that the results are retrieved from there. It could be being
written to there.
Look at the number of consistent gets: it's zero in the first step (I assume you had already run this query before) and I would
conclude that the data is being read from the result cache.
In the third step there are 4 consistent gets. I would conclude that the data is being written to the result cache, a fourth step repeating
the SQL should show zero consistent gets and that would be the results being read.

Result Cache in oracle 11g release 2.0.2.0

All,
Few months back I was trying Result Cache feature of 11g release 2.0.1.0. That time oracle mentioned that they have 3 modes to use this feature by setting result_cache_mode paramter to AUTO, FORCE or MANUAL. With AUTO mode (result_cache_mode=AUTO) you can identify queries that may benefit from result cache. I would like to know whcih views or function I should see where it captures this information.
In 11.2.0.1.0 documentation it was referencing some views (I totally don't remember those views names) and said those will be available in 11.2.0.2.0.
Is anyone know about this?
Thanks in advance.

user2486753 wrote:
Though oracle doc doesn't say about AUTO it is still accepts that value and caches the result of the SQL query if you add /*+ result cache */ hint to the SQL.
I know that they did mentioned in 112010 some where that it will help users to find which SQL's are good candidates for caching by running the application for a while. I just couldn't fine it.If we are adding AUTO and still passing the hint, its the same behavior as like MANUAL. I am not sure that I have seen the value anywhere and neither its there in the docs too.
HTH
Aman....

How to Enable Result Cache in 11g XE ?

Similar Messages

Maybe you are looking for