Delete result cache

Hello guys,
I just on measuring the response time for some SPARQL Queries that I send to my DB. In order to have similar and correct times and to compare the times, I want to delete the cache.
Can anyone tell me, how to delete the cache?
Do I have to delete it by entering any command in SQL*PLUS or is it also possible to delete the cache in Oracle Enterprise Manager?
ah, btw: I am using Oracle 11g ;)
Regards
Christian

Are you talking about result cache? I don't think it is used for your queries.
To measure query execution time, one way is to run a benchmark query multiple times, get rid of the first one (or two) result(s) and take
an average of the rest.
Cheers,
Zhe Wu

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Client Result Cache for geometries

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All the artwork in Album View in iTunes is fuzzy/blurry unless i repeatedly delete the cache.

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Responding to your request here.
I can't say it's a problem I've noticed personally, though now you've made me look it does seem that the large thumbnail is slightly fuzzier than the same image in the artwork panel. I have the artwork panel as small as it goes (small screen) and it is still slightly larger than the image in the browser so that might be all there is to it.
Here's an example from my screen.
Perhaps iTunes is storing a thumbnail at say "medium" size which it then blows up to create the large image. Are you seeing a similar effect or is your "fuzzy" art much fuzzier? A screenshot would be helpful.
tt2

I have an iPod touch and it doesn't seem to be working right it is rather slow I get booted from sites I have deleted history cache cookies still have 22.1 available space what can I do to solve the problem do I need an antivirus

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Hi, I developed a web application using HTML5-Offline Application Cache mechanism. Inspite of deleting the cache as mentioned in the above steps, Firefox still maintains a copy of the page in it's cache. Also, a serious bug is, even though we delete all

== Issue
==
I have a problem with my bookmarks, cookies, history or settings
== Description
==
Hi,
I developed a web application using HTML5-Offline Application Cache mechanism. Inspite of deleting the cache as mentioned in the above steps, Firefox still maintains a copy of the page in it's cache. Also, a serious bug is, even though we delete all temp files used by Firefox, and open the previously cached page, it displays it correctly, but upon refreshing/reloading it again shows the previous version of the page maintained in the cache.
== Troubleshooting information
==
HTML5: Application Caching
.style1 {
font-family: Consolas;
font-size: small;
text-align: left;
margin-left: 80px;
function onCacheChecking(e)
printOutput("CHECKINGContents of the manifest are being checked.", 0);
function onCacheCached(e) {
printOutput("CACHEDAll the resources mentioned in the manifest have been downloaded", 0);
function onCacheNoUpdate(e)
printOutput("NOUPDATEManifest file has not been changed. No updates took place.", 0);
function onCacheUpdateReady(e)
printOutput("UPDATEREADYChanges have been made to manifest file, and were downloaded.", 0);
function onCacheError(e) {
printOutput("ERRORAn error occured while trying to process manifest file.", 0);
function onCacheObselete(e)
printOutput("OBSOLETEEither the manifest file has been deleted or renamed at the source", 0);
function onCacheDownloading(e) {
printOutput("DOWNLOADINGDownloading resources into local cache.", 0);
function onCacheProgress(e) {
printOutput("PROGRESSDownload in process.", 0);
function printOutput(statusMessages, howToTell)
* Outputs information about an event with its description
* @param statusMessages The message string to be displayed that describes the event
* @param howToTell Specifies if the output is to be written onto document(0) or alert(1) or both(2)
try {
if (howToTell == 2) {
document.getElementById("stat").innerHTML += statusMessages;
window.alert(statusMessages);
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window.alert(statusMessages);
catch (IOExceptionOutput) {
window.alert(IOExceptionOutput);
function initiateCaching()
var ONLY_DOC = 0;
var ONLY_ALERT = 1;
var BOTH_DOC_ALERT = 2;
try
if (window.applicationCache)
var appcache = window.applicationCache;
printOutput("BROWSER COMPATIBILITYSUCCESS!! AppCache works on this browser.", 0);
appcache.addEventListener('checking', onCacheChecking, false);
appcache.addEventListener('cached', onCacheCached, false);
appcache.addEventListener('noupdate', onCacheNoUpdate, false);
appcache.addEventListener('downloading', onCacheDownloading, false);
appcache.addEventListener('progress', onCacheProgress, false);
appcache.addEventListener('updateready', onCacheUpdateReady, false);
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catch (UnknownError)
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==
3.6.3
== Operating system
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Windows XP
== User Agent
==
Mozilla/5.0 (Windows; U; Windows NT 5.1; en-GB; rv:1.9.2.3) Gecko/20100401 Firefox/3.6.3 ( .NET CLR 3.5.30729; .NET4.0E)
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==
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*Adobe PDF Plug-In For Firefox and Netscape "9.3.2"
*NPRuntime Script Plug-in Library for Java(TM) Deploy
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Thanks & Regards,
Kandarpa Chandrasekhar Omkar
Software Engineer
Wipro Technologies
Bangalore.
[email protected]
[email protected]

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Delete Results for workbook layout in BI.7

Hi Experts,
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Thanks
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Hi,
refer to this link:
BEx Analyzer [Analyse mode|http://help.sap.com/saphelp_nw70/helpdata/en/e3/e60138fede083de10000009b38f8cf/frameset.htm]
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Edited by: Tobias on May 19, 2008 4:49 PM

Query result caching on oracle 9 and 10 vs indexing

I am trying to improve performance on oracle 9i and 10g.
We use some queries that take up to 30 minutes to execute.
I heard that there are some products to cache query results.
Would this have any advantage over using indexes or materialized views?
Does anyone know any products that I can use to cache the results of this queries on disk?
Personally I think that by using the query result caching I would reduce the cpu time needed to process the query.
Is this true?

Your message post pushes all the wrong buttons starting with the fact that 9i and 10g are marketing labels not version numbers.
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If you want help post full version numbers, the SQL statements, and the DBMS_XPLAN outputs.

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

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.

I have blurry artwork in Album View thumbnails. Deleting the cache makes all the artwork sharp, but once iTunes is restarted, the artwork goes back to being fuzzy unless i delete cache again.

I have blurry artwork in Album View thumbnails, but not in Grid View/Cover Flow. Deleting the cache and forcing it to rebuild makes all the artwork sharp, but once iTunes is restarted, the artwork goes back to being fuzzy unless i delete cache again.

Responding to your request here.
I can't say it's a problem I've noticed personally, though now you've made me look it does seem that the large thumbnail is slightly fuzzier than the same image in the artwork panel. I have the artwork panel as small as it goes (small screen) and it is still slightly larger than the image in the browser so that might be all there is to it.
Here's an example from my screen.
Perhaps iTunes is storing a thumbnail at say "medium" size which it then blows up to create the large image. Are you seeing a similar effect or is your "fuzzy" art much fuzzier? A screenshot would be helpful.
tt2

I have to keep deleting the cache. Facebook and hotmail issues

Ok, i guess 2 months ago, nobody answered my question. I get very frustrated.
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If you need to delete the cache that often then it appears that you have either an extension or external (cleanup) software causing problems with the cache. If shouldn't be necessary to clear the cache under normal conditions.
Start Firefox in [[Safe Mode]] to check if one of your add-ons is causing your problem (switch to the DEFAULT theme: Tools > Add-ons > Themes).
* Don't make any changes on the Safe mode start window.
See [[Troubleshooting extensions and themes]] and [[Troubleshooting plugins]]

I'm having 10.8.3 and today 17-Apr I had installed latest java 7 update. Now when ever I test java page it just redirects the page to Java download on both Firefox and safari. I tried deleting the cache from Java Sec Panel - temp ile but still same proble

I'm having 10.8.3 and today 18-Apr Thursday I had installed latest java 7 update. Now when ever I test java page it just redirects the page to Java download on both Firefox and safari. I tried deleting the cache from Java Sec Panel - temp ile but still same prob.

Make sure that the plugin is not automatically disabled in Firefox:
Clinton

Function result Cache in oracle 11G

Hi,
i am reading the following article and trying to reproduce same set of statements to learn about function result cache.
http://www.oracle.com/technology/oramag/oracle/07-sep/o57asktom.html
Details about my output:
SQL> create or replace
function not_cached
( p_owner in varchar2 )
return number
as
l_cnt number;
begin
select count(*)
into l_cnt
from t
where owner = p_owner;
sys.dbms_lock.sleep(1);
return l_cnt;
end;
Function created.
Elapsed: 00:00:00.13
SQL> create or replace
function cached
( p_owner in varchar2 )
return number
result_cache
relies_on(T)
as
l_cnt number;
begin
select count(*)
into l_cnt
from t
where owner = p_owner;
dbms_lock.sleep(1);
return l_cnt;
end;
Function created.
Elapsed: 00:00:00.08
SQL> exec dbms_output.put_line( not_cached( 'SCOTT' ) );
PL/SQL procedure successfully completed.
Elapsed: 00:00:01.06
SQL> exec dbms_output.put_line( not_cached( 'SCOTT' ) );
PL/SQL procedure successfully completed.
Elapsed: 00:00:01.01
SQL> SQL> exec dbms_output.put_line( not_cached( 'SCOTT' ) );
PL/SQL procedure successfully completed.
Elapsed: 00:00:01.02
SQL> SQL> set serveroutput on
SQL> exec dbms_output.put_line( not_cached( 'SCOTT' ) );
0
PL/SQL procedure successfully completed.
Elapsed: 00:00:01.02
SQL> SQL> exec dbms_output.put_line( cached( 'SCOTT' ) );
0
PL/SQL procedure successfully completed.
Elapsed: 00:00:01.02
SQL> SQL> exec dbms_output.put_line( cached( 'SCOTT' ) );
0
PL/SQL procedure successfully completed.
Elapsed: 00:00:01.02
SQL> SQL> exec dbms_output.put_line( cached( 'SCOTT' ) );
0
PL/SQL procedure successfully completed.
SQL> exec dbms_output.put_line( cached( 'SCOTT' ) );
0
PL/SQL procedure successfully completed.
Elapsed: 00:00:01.01
I am supposed to get the results quickly for "cached" call. However, i still dont see any change in the response time. May i know what i am missing here?
Thank you
Giridhar

Try to play with
RESULT_CACHE_MAX_SIZE
http://download.oracle.com/docs/cd/B28359_01/server.111/b28320/initparams206.htm#REFRN10272
RESULT_CACHE_MAX_RESULT
http://download.oracle.com/docs/cd/B28359_01/server.111/b28320/initparams205.htm#REFRN10298

Production use of the Result Cache area

Hi all,
   OS.......: OEL 6.3 (x86_64)
   DB.......: Oracle 11.2.0.3 (x86_64)
   I would like to know from those who have used the Result Cache massively in production environments... just to know the opinion of the ones who have used this "for real". Did you use it proactively, to solve a specific problem? Or in every new database created, you configure this memory area? Did it really work as it should be?
   Thanks in advance.

Hi Fabricio,
We run result cache in our live forecast system on 11.2.0.2. We have result_cache_mode set to force and a cache of 20MB. The performance improvement we get with this is incredible, from a server running flat out to a server that looks like it's hardly doing anything. Of course it depends on exactly how your app works but we've seen no issues with it other than occassional waits for the result cache latch when there are a large number of requests - but even when this happens it's still way faster than running without result cache.
Cheers,
Harry

Delete result cache

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