In which cases does String.intern() increase the performance?
I'm optimizing my program and I wonder when I should use the String.intern() method to increase my performance. Is there a downside of using the intern() method?
paul.miner wrote:
kajbj wrote:
I have once implemented a system where intern was called on all strings when they arrived from a socket, and all comparisons was done using == after that. The reason was actually performance since we had to compare lots and lots of strings often. There is however a drawback with it. calling intern() when you have many strings in the pool is very slow (I would guess that it was linear time). You it's now always that you can improve performance by calling intern and comparing with ==Good point.
I think if I was in this position though, I'd create my own interned string pool instead of cluttering the one in String.We tried that as well. We pretty much did everything we could think of to reduce memory footprint while gaining execution time. Startup time was not of importance so it was not a problem that it took an hour to start the system.
Similar Messages
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Urgent: regarding the increasing the performance of report
Hi,
I had a report which is displaying the correct data but i execute on PRD Server,it gets Request Time Out.So i want to increase the performance of it.Plzz help me out in doing this.
REPORT ZWIP_STOCK NO STANDARD PAGE HEADING LINE-SIZE 150.
TABLES: AFPO, AFRU, MARA, MAKT.
DATA: BEGIN OF ITAB OCCURS 0,
AUFNR LIKE AFPO-AUFNR,
MATNR LIKE AFPO-MATNR,
LGORT LIKE AFPO-LGORT,
MEINS LIKE MARA-MEINS,
NTGEW LIKE MARA-NTGEW,
MTART LIKE MARA-MTART,
STOCK TYPE P LENGTH 10 DECIMALS 3,
END OF ITAB.
DATA : ITAB2 LIKE ITAB OCCURS 0 WITH HEADER LINE.
DATA : DESC LIKE MAKT-MAKTX.
SELECT-OPTIONS : MAT_TYPE FOR MARA-MTART.
SELECT-OPTIONS : P_MATNR FOR AFPO-MATNR.
DATA : V_MINOPR LIKE AFRU-VORNR,
V_MAXOPR LIKE AFRU-VORNR,
V_QTYMIN LIKE AFRU-GMNGA,
V_QTYMAX LIKE AFRU-GMNGA,
V_QTY TYPE P LENGTH 10 DECIMALS 3.
SELECT AAUFNR AMATNR ALGORT BMEINS BNTGEW BMTART FROM AFPO AS A
INNER JOIN MARA AS B ON AMATNR = BMATNR
INTO TABLE ITAB WHERE ELIKZ <> 'X' AND MTART IN MAT_TYPE AND A~MATNR IN P_MATNR.
ITAB2[] = ITAB[].
SORT ITAB2 BY MATNR MEINS MTART NTGEW.
DELETE ADJACENT DUPLICATES FROM ITAB2 COMPARING MATNR MEINS MTART NTGEW.
LOOP AT ITAB2.
V_QTY = 0.
LOOP AT ITAB WHERE MATNR = ITAB2-MATNR.
SELECT MIN( VORNR ) INTO V_MINOPR FROM AFRU WHERE AUFNR = ITAB-AUFNR.
SELECT MAX( VORNR ) INTO V_MAXOPR FROM AFRU WHERE AUFNR = ITAB-AUFNR.
SELECT SUM( GMNGA ) INTO V_QTYMIN FROM AFRU WHERE AUFNR = ITAB-AUFNR AND VORNR = V_MINOPR.
SELECT SUM( GMNGA ) INTO V_QTYMAX FROM AFRU WHERE AUFNR = ITAB-AUFNR AND VORNR = V_MAXOPR.
V_QTY = V_QTY + V_QTYMIN - V_QTYMAX.
ENDLOOP.
ITAB2-STOCK = V_QTY.
MODIFY ITAB2.
ENDLOOP.
LOOP AT ITAB2.
WRITE:/ ITAB2-MATNR,ITAB2-STOCK.
ENDLOOP.Instead of code from
itab2[] = itab[] till last endloop try code given below
data : begin of minopr occurs 0,
aufnr type afru-aurnr,
vornr type afru-vornr,
end of minopr.
data : begin of maxopr occurs 0,
aufnr type afru-aurnr,
vornr type afru-vornr,
end of maxopr.
data : begin of qtymin occurs 0,
aufnr type afru-aurnr,
vornr type afru-vornr,
end of qtymin.
data : begin of qtymax occurs 0,
aufnr type afru-aurnr,
vornr type afru-vornr,
end of qtymax.
select aurnr vornr into table minopr from afru for all entries in itab where aurnr = itab-aufnr
maxopr[] = minopr[].
sort minopr by aufnr vornr ascending.
sort maxopr by aufnr vornr descending.
delete adjacent duplicates from minopr comparing aufnr.
delete adjacent duplicates from maxopr comparing aufnr.
SELECT aufnr vornr GMNGA INTO TABLE QTYMIN FROM AFRU for all entries in minopr WHERE AUFNR = minopr-AUFNR AND VORNR = MINOPR-vornr.
SELECT aufnr vornr GMNGA INTO TABLE QTYMAX FROM AFRU for all entries in maxopr WHERE AUFNR = maxopr-AUFNR AND VORNR = maxopr-vornr.
sort qtymin by aufnr.
sort qtymax by aufnr
sort itab by matnr MEINS MTART NTGEW.
LOOP AT ITAB.
v_minopr = 0.
v_maxopr = 0.
read table qtymin with key aufnr = itab-aufnr binary search.
if sy-subrc = 0.
loop at qtymin from sy-tabix.
if qtymin-aufnr = itab-aufnr.
V_MINOPR = V_MINOPR + itab-gmnga.
else.
exit.
endif.
endloop.
endif.
read table qtymax with key aufnr = itab-aufnr binary search.
if sy-subrc = 0.
loop at qtymax from sy-tabix.
if qtymax-aufnr = itab-aufnr.
V_MaxOPR = V_MaxOPR + itab-gmnga.
else.
exit.
endif.
endloop.
endif.
V_QTY = V_QTY + V_QTYMIN - V_QTYMAX.
At new itab-matnr.
if sy-tabix = 1.
continue.
endif.
itab2 = itab.
itab2-stock = v_qty.
append itab2.
V_QTY = 0.
endat.
ENDLOOP.
itab2 = itab.
itab2-stock = v_qty.
append itab2.
LOOP AT ITAB2.
WRITE:/ ITAB2-MATNR,ITAB2-STOCK.
ENDLOOP. -
How to increase the performance in server 2008 R2 for RDP users
Hi,
My application take to much time to load. If anyone double click on mail client the exe file will appear in task manager but it will open after 5 mins. how to increase the performance.
My sever configuration is as below,
SC2600 Intel motherboard with total 24 core processors and 32 GB RAM and 8 TB Hard Disk. RAID 5 is configured which has two lungs one is 167 GB for C drive and other is 4.5 TB for D drive.
There are 28 Thin-clients connected to server through L300 N computing Thin-clients.
Thin-clients connect to V-space server installed in server for RDP users to get connected.
we have installed around 20 applications including printer and scanner driver. And apps are has below,
Firefox browser, windows mail, Adobe acrobat XI, canon printer and scanner drivers, Epson printer and scanner driver, E scan anti-virus, office 2007, v space, power ISO, win-rar,Tally and e token drivers and some backup software's.
Below are the services and features enabled,
AD, File services, RDP, web server, Hyper-v, .net frame work.
Is there a way to increase the performance .
Very slow performance.Hi,
what would you suggest on hardware configuration must be for above mentioned applications and services with those many users.
how many cores and ram size is required. -
Increase the Performance of Search In Interactive Report
Hi,
I created a report which has about 10000+ records. To load the report it is not taking much time. But when i make a search in interactive report it is taking lot of time. Please suggest me how to increase the performance of interactive search.
I am using Oracle apex 3.2 and Oracle 10g XE database.
Please suggest me.
Thanks
SudhirHi,
1) I am using Row Ranges Pagination from X to Y
2) To Execute it takes about 1.15 seconds
3) This is the function am using to make a call
FUNCTION FUNC_ORACLE_CONTRACT(P_SERIAL_NUMBER IN VARCHAR2,P_FLAG IN VARCHAR2)
RETURN VARCHAR2
AS
L_LOCATION_ID NUMBER;
L_SYSTEM_ID VARCHAR2(200);
L_ENTITLEMENT_ID VARCHAR2(200);
L_CREATED_DATE DATE;
L_COMPANY_NAME VARCHAR2(500);
L_LEGAL_NAME VARCHAR2(500);
SELECT DISTINCT LOCATION_ID, SYSTEM_ID, ENTITLEMENT_ID, CREATED_DATE
FROM CUSTOMER_LICENSES
WHERE PRODUCT_SERIAL_NUMBER = P_SERIAL_NUMBER OR
ENTITLEMENT_ID = P_SERIAL_NUMBER OR
ACTIVATION_ID = P_SERIAL_NUMBER ;
BEGIN
OPEN C1;
FETCH C1 INTO L_LOCATION_ID, L_SYSTEM_ID, L_ENTITLEMENT_ID, L_CREATED_DATE;
IF P_FLAG = 'COMPANY_ID' THEN
SELECT COMPANY_NAME || ' (C)' INTO L_COMPANY_NAME
FROM CUSTOMER_LOCATIONS
WHERE LOCATION_ID = L_LOCATION_ID;
IF L_COMPANY_NAME IS NULL THEN
SELECT LEGAL_NAME || ' (P)' INTO L_LEGAL_NAME
FROM PARTNER_LOCATIONS
WHERE ID = L_LOCATION_ID;
RETURN L_LEGAL_NAME ;
ELSE
RETURN L_COMPANY_NAME ;
END IF;
ELSIF P_FLAG = 'SYSTEM_ID' THEN
RETURN L_SYSTEM_ID;
ELSIF P_FLAG = 'ENTITLEMENT_ID' THEN
RETURN L_ENTITLEMENT_ID;
ELSIF P_FLAG = 'LOCATION_ID' THEN
RETURN L_LOCATION_ID;
END IF;
CLOSE C1;
EXCEPTION
WHEN NO_DATA_FOUND THEN
RETURN NULL;
WHEN OTHERS THEN
RETURN NULL;
END FNC_ORACLE_CONTRACTS;Edited by: Sudhir_Meru on Apr 9, 2013 4:11 PM -
Increase the performance of fileadapter
Hi,
can any body tell me how to increase the performance of the FILEADAPTER & DBADAPTER?
Regards,
Krishna.As Anirudh has correctly stated you should upgrade if possible. In 10.1.3.1 the DB adapter had many issues, plus 10.1.3.1 was released 3 years ago so very old version.
I would recommend upgrading or starting on 11.1.1.2 as there have been many improvement in the file and db adapters to manage large payloads. In 10.1.3.x you have limitations of 1MB in size before you need to start tuning or doing some advanced configuration.
11g is the way forward, implemented using Oracle strategic application.
cheers
James -
Increase the performance in webdynpro
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i am executing one report having huge data which is retrieving from SAP R/3 using RFC and display the data in portal using webdynpro the problem is if u execute this report using URL in internet site it is not displaying because of timeout exception (i think) how to increase the performance to execute that report with in the time for that request(but it is displaying the data if we execute the data in developement server but it takes lot of time )
How to solve this issue?Hi we are using real time job .
source : MDG [IDOCS]
Transforms: Data Quality ,Address cleanse
so here we want to increase the performance of the job ..
so what are the performance tuning techniques for real time job ??
This are the details related to job . please share your ideas -
How to increase the performance of an insert query?
Hi,
I am using oracle database for our application where we executes one insert query and need the performance of 300 insert queries to be executed per second.
As of now we are getting only 30/sec.We are not knowing how to tune the database for getting this performance.
we are doing all this though C programming under both linux and solaris environment.
Can u guide me in this issue.
Regards,
vamsi krishnaPerformance tuning issue is not something you can get a straight forward answer for.
You need to look at various aspects of the system to get close to or increase the performance of your application. Tuning just the database might not give you want you want.
So, you need to look at the Application codes, Mermory, Disk IO, etc. Have a look at the Performance Tuning Guide from the Oracle Documentation Library for your Oracle Release and Operating System
http://www.oracle.com/technology/documentation/index.html#previous -
How to increase the performance of a domain index?
Oracle Database 10g Enterprise Edition Release 10.2.0.3.0 - 64bit Production
I am using a dynamic query which uses a domain index for a clob column. The table has 1021487 records. How can i increase the performance of a select query based on this table? This is the only part where my application gets slowed down.
The query is
SELECT :search_id, 100, :item_type, c.search_college, c.search_colname, TRUNC(dbms_random.value(900000000000, 999999999999)) rand, COUNT(1), c.college_rating, min(DECODE(c.search_postcode, NULL, 99999, NULL)) search_distance FROM w_search_text c WHERE c.search_course_type is not null
and (contains(c.search_text,:search_text,2) > 0)
AND c.search_item_type = :item_bind
GROUP BY c.search_college, c.search_colname, c.college_rating
ORDER BY c.search_college
here c.search_text is the domain indexed column?
Is there a way to tune it?
RamHere c.search_text is the clob column.
i am using 4 bind variables and they are search id : 123456
item_type : O
search_text : French
item_bind : Z
I tried explain plan and here are the results
Plan
SELECT STATEMENT ALL_ROWSCost: 5 Bytes: 38,280 Cardinality: 264
3 SORT GROUP BY Cost: 5 Bytes: 38,280 Cardinality: 264
2 TABLE ACCESS BY INDEX ROWID TABLE HOT_ADMIN.W_SEARCH_TEXT_LIVE2 Cost: 4 Bytes: 38,280 Cardinality: 264
1 DOMAIN INDEX INDEX (DOMAIN) HOT_ADMIN.W_SRCH_TXT_IDX2 Cost: 4
Its using the domain index, But the column is highly fed up with data...so ithink that may be the reason.Is there any HINTS in particular to tune domain indexes?
Ram -
How to increase the performance of a report
can any body tell me how to increase the performance of a report?////
i have prepared a report to show the expense detail .I have used BSIS and BSAS table.
But whenever I am executing it is facing runtime error (TIME_OUT error ).
Moderator Message: Duplicate Post. Read my comments in your previous thread.
Edited by: kishan P on Nov 25, 2010 1:38 PMPlease SEARCH in SCN before posting.
Also post performance related issues here. -
How to increase the performance of a program
How to increase the performance of a program.
Regards
Lisa
Message was edited by: Lisa RoyHere are some links that may help.
http://www.sapinsideronline.com/searchspi/search.htm?page=article&key=20297&query_text=performance%7Ctuning
http://www.sapinsideronline.com/searchspi/search.htm?page=article&key=44221&query_text=performance%7Ctuning -
How to increase the performance of Weblogic server 7.0?
How to increase the performance of Weblogic server 7.0 ?
also, how do i avoid typing the server login and password evertime I start the
webserver?How to increase the performance of Weblogic server 7.0 ?It depends on what is not running fast enough for you.
also, how do i avoid typing the server login and password evertime I
start the webserver?In the startWebLogic shell script (.cmd or .sh) add:
set WLS_USER=weblogic
set WLS_PW=password
(Replace "password" with whatever your password is.)
Peace,
Cameron Purdy
Tangosol, Inc.
http://www.tangosol.com/coherence.jsp
Tangosol Coherence: Clustered Replicated Cache for Weblogic
"winston" <[email protected]> wrote in message
news:3fe42d33$[email protected]..
> -
Increase the Performance of a package while execution
Hi,
i am using oracle 9i and linux..
in my pl/sql if i executed a particular package it will take 5 min.
please explain how to increase the performance of the package
how to extract the query from the package and
how to build an explain plan..
and how to tune the query
RegardsIf you wanna test pl/sql, sql profiler is a good way to test.
You can always use 10046 event to trace the queries in the package. Take their explain plan and see if there is any room for tune.
affar -
Increasing the performance of the abap program
Hi ,
Anybody had any document regarding how to increase the performance of ABAP program.
Regards,
baijuhi,
Refer This link.
<b>
Performance tuning for Data Selection Statement</b>
http://www.sap-img.com/abap/performance-tuning-for-data-selection-statement.htm
<b>
1. Debugger</b>
http://help.sap.com/saphelp_47x200/helpdata/en/c6/617ca9e68c11d2b2ab080009b43351/content.htm
http://www.cba.nau.edu/haney-j/CIS497/Assignments/Debugging.doc
http://help.sap.com/saphelp_erp2005/helpdata/en/b3/d322540c3beb4ba53795784eebb680/frameset.htm
<b>2. Run Time Analyser</b>
http://help.sap.com/saphelp_47x200/helpdata/en/c6/617cafe68c11d2b2ab080009b43351/content.htm
<b>3. SQL trace</b>
http://help.sap.com/saphelp_47x200/helpdata/en/d1/801f7c454211d189710000e8322d00/content.htm
<b>4. CATT - Computer Aided Testing Too</b>
http://help.sap.com/saphelp_47x200/helpdata/en/b3/410b37233f7c6fe10000009b38f936/frameset.htm
<b>
5. Test Workbench</b>
http://help.sap.com/saphelp_47x200/helpdata/en/a8/157235d0fa8742e10000009b38f889/frameset.htm
<b>
6. Coverage Analyser</b>
http://help.sap.com/saphelp_47x200/helpdata/en/c7/af9a79061a11d4b3d4080009b43351/content.htm
<b>
7. Runtime Monitor</b>
http://help.sap.com/saphelp_47x200/helpdata/en/b5/fa121cc15911d5993d00508b6b8b11/content.htm
<b>
8. Memory Inspector</b>
http://help.sap.com/saphelp_47x200/helpdata/en/a2/e5fc84cc87964cb2c29f584152d74e/content.htm
<b>9. ECATT - Extended Computer Aided testing tool.</b>
http://help.sap.com/saphelp_47x200/helpdata/en/20/e81c3b84e65e7be10000000a11402f/frameset.htm -
I am a songwriter and want to upload my work to itune but I need a few question cleared up.
1. Does Itune interact with the Performing Arts organization such as BMI in order for artist to be paid or do i just set up a paypal account and pay artist myself?
2. What percentage of sales does itune take or is it a flat rate?
3. When i upload does itune give me an option to set price for my work.?TownSquareTheMusic wrote:
I am a songwriter and want to upload my work to itune but I need a few question cleared up.
1. Does Itune interact with the Performing Arts organization such as BMI in order for artist to be paid or do i just set up a paypal account and pay artist myself?
2. What percentage of sales does itune take or is it a flat rate?
3. When i upload does itune give me an option to set price for my work.?
Town Square,
In addition to the iTunes Store, you may wish to check out some of the online stores that may be a bit more flexible for artists just starting to sell online:
NoiseTrade
BandCamp -
How to increase the performance of an Application
Hi,
I am using jdeveloper11.1.1.2.0 and weblogic server10.3.2.I have lot of txn in the database.when click the txn menu then page landing is very slow.My Txn data is 24thousands records.
My RAM is 8GB and 64bit machine .So how to fast my application?Is any idea then Please help me.
Thanks
AnupHi Frank,
I have follow the below link but there is no performance effect of my application.
http://www.gebs.ro/blog/oracle/adf-view-object-performance-tuning-analysis/
On VO level ,In Tuning
I have modified In batch Of 26 ,As needed ,and Query Optimizer hints FIRST_ROWS_26
AND ON the page level ,Table Column Property,Fetch size i have modified 26 and page definition level ExchangeTradedPlacementHeadVOIterator default range size is 25.
So i have above change but there is no effect on the performance of my application.
Please give me the Solution what will i do to increase the performance of an application.
Thanks
Anup
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