Too much time on network wait!

At peak time my apex pages are very very slow. I open Home>Utilities>Database Monitor>Sessions>Waits, and see all wait classes are network. I have already changed shared_servers to 100. But all waiting sessions are still waiting for network. How to improve it? Thank you!

John,
it was in the context of a cross-platform 9.2 to 11.1 migration that
we decided to opt for EPG using the APEX bundle integral to the db
packages (thus, we are still running 3.0.1). I think some documents
mentioned certain advantages of this architecture, but meanwhile I
have my doubts ...
To install APEX, we simply followed Note:457621.1 (How to Configure
Oracle Application Express (APEX) & the Embedded PL/SQL Gateway (EPG)
in an 11G DB).
We currently have a SR open for weeks, were it is tried to track down
the reason for those numerous virtual circuit waits, and found that
all sessions emenate from APEX sessions (with various users and
various apps). Thus, it is quite difficult to track down the reason
for those waits.
Is there an easy procedure to switch to Apache instead of EPG?
Regards, Thomas

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Bootcamp: WinXP: Network initialization takes too much time

Hey
I've set up a BootCamp partition on my Macbook 6,1: Windows XP Professional 32-bit SP3 (up-to-date).
Its a fresh installation, with latest BootCamp drivers.
From start on, the network-initialization takes too much time:
- Windows boots up
- Enter password
- Desktop appear
- after 2-3 minutes, the network symbols appear in the taskbar.
If I open the System Control panel and want to enter the networking-devices it loads until network is really initiated.
I also can't browse to any web-site (through IE).
So, it seems that something blocks or prevent the networking from fast start-up.
I've tried to disable WLAN, same problem
If I disconnect all connections (no LAN-cable, no WLAN configured) its still the same problem.
Does anybody have a similar issue?

You can read: I have installed BootCamp (Lions one said no, but I have an MacBook 6,1 - Yep, this one was shipped with Snow Leopard, so I have the "old" BootCamp drivers with XP-drivers on my Install-disc.).
The BootCamp drivers from the Mac OSX 10.6 CD are installed and updated through Apple-Update.
So, WinXP should be supported?

Large records retrieve from network took too much time.How can I improve it

HI All
I have Oracle server 10g, and I have tried to fetch around 200 thousand (2 lack ) records. I have used Servlet that is deploy into Jboss 4.0.
And this records come from network.
I have used simple rs.next_ method but it took too much time. I have got the only 30 records with in 1 sec. So if I want all these 2 lacks records system take around more than 40 min. And my requirement is that it has to be retrieve within 40 min.
Is there any another way around this problem? Is there any way that at one call Result set get 1000 records at one time?
As I read somewhere that “ If we use a normal ResultSet data isn't retrieved until you do the next call. The ResultSet isn't a memory table, it's a cursor into the database which loads the next row on request (though the drivers are at liberty to anticipate the request). “
So if we can pass the a request to around 1000 records at one call then maybe we can reduce time.
Has anyone idea How to improve this problem?
Regards,
Shailendra Soni

That true...
I have solved my problem invokeing setFetchSize on ResultSet object.
like ResultSet.setFetchSize(1000).
But The problem sorted out for the less than 1 lack records. Still I want to do the testing for more than 1 lack records.
Actually I had read a one nice article on net
[http://www.precisejava.com/javaperf/j2ee/JDBC.htm#JDBC114]
They have written a solutions for such type of the problem but they dont give any examples. Without examples i dont find how to resolve this type of the problem.
They gave two solutions i,e
Fetch small amount of data iteratively instead of fetching whole data at once
Applications generally require to retrieve huge data from the database using JDBC in operations like searching data. If the client request for a search, the application might return the whole result set at once. This process takes lot of time and has an impact on performance. The solution for the problem is
1. Cache the search data at the server-side and return the data iteratively to the client. For example, the search returns 1000 records, return data to the client in 10 iterations where each iteration has 100 records.
// But i don't understand How can I do it in java.
2. Use Stored procedures to return data iteratively. This does not use server-side caching rather server-side application uses Stored procedures to return small amount of data iteratively.
// But i don't understand How can I do it in java.
If you know any one of these solutions then can you please give me examples to do it.
Thanks in Advance,
Shailendra

Taking too much time to load application

Hi,
I have deployed a j2ee application on oracle 10g version 10.1.2.0.2. But the application is taking too much time to load. After loading ,everything works fast.
I have another 10g server (same version) in which the same application is loading very fast.
When I checked the apache error logs found this :-
[Thu Apr 26 09:17:31 2007] [warn] [client 10.1.20.9] oc4j_socket_recvfull timed out
[Thu Apr 26 09:17:31 2007] [error] [client 10.1.20.9] [ecid: 89128867058,1] (4)Interrupted system call: MOD_OC4J_0038: Receiving data from oc4j exceeded the configured "Timeout" value and the error code is 4.
[Thu Apr 26 09:17:31 2007] [error] [client 10.1.20.9] [ecid: 89128867058,1] MOD_OC4J_0054: Failed to call network routine to receive an ajp13 message from oc4j.
[Thu Apr 26 09:17:31 2007] [error] [client 10.1.20.9] [ecid: 89128867058,1] MOD_OC4J_0033: Failed to receive an ajp13 message from oc4j.
[Thu Apr 26 09:17:31 2007] [warn] [client 10.1.20.9] [ecid: 89128867058,1] MOD_OC4J_0078: Network connection errors happened to host: lawdb.keralalawsect.org and port: 12501 while receiving the first response from oc4j. This request is recoverable.
[Thu Apr 26 09:17:31 2007] [error] [client 10.1.20.9] [ecid: 89128867058,1] MOD_OC4J_0121: Failed to service request with network worker: home_15 and it is not recoverable.
[Thu Apr 26 09:17:31 2007] [error] [client 10.1.20.9] [ecid: 89128867058,1] MOD_OC4J_0013: Failed to call destination: home's service() to service the request.
[Thu Apr 26 11:36:36 2007] [notice] FastCGI: process manager initialized (pid 21177)
[Thu Apr 26 11:36:37 2007] [notice] Oracle-Application-Server-10g/10.1.2.0.2 Oracle-HTTP-Server configured -- resuming normal operations
[Thu Apr 26 11:36:37 2007] [notice] Accept mutex: fcntl (Default: sysvsem)
[Thu Apr 26 11:36:37 2007] [warn] long lost child came home! (pid 9124)
[Thu Apr 26 11:39:51 2007] [error] [client 10.1.20.9] [ecid: 80547835731,1] MOD_OC4J_0015: recv() returns 0. There has no message available to be received and oc4j has gracefully (orderly) closed the connection.
[Thu Apr 26 11:39:51 2007] [error] [client 10.1.20.9] [ecid: 80547835731,1] MOD_OC4J_0054: Failed to call network routine to receive an ajp13 message from oc4j.
[Thu Apr 26 11:39:51 2007] [error] [client 10.1.20.9] [ecid: 80547835731,1] MOD_OC4J_0033: Failed to receive an ajp13 message from oc4j.
[Thu Apr 26 11:39:51 2007] [warn] [client 10.1.20.9] [ecid: 80547835731,1] MOD_OC4J_0078: Network connection errors happened to host: lawdb.keralalawsect.org and port: 12501 while receiving the first response from oc4j. This request is recoverable.
[Thu Apr 26 11:39:51 2007] [warn] [client 10.1.20.9] [ecid: 80547835731,1] MOD_OC4J_0184: Failed to find an oc4j process for destination: home
[Thu Apr 26 11:39:51 2007] [error] [client 10.1.20.9] [ecid: 80547835731,1] MOD_OC4J_0145: There is no oc4j process (for destination: home) available to service request.
[Thu Apr 26 11:39:51 2007] [error] [client 10.1.20.9] [ecid: 80547835731,1] MOD_OC4J_0119: Failed to get an oc4j process for destination: home
[Thu Apr 26 11:39:51 2007] [error] [client 10.1.20.9] [ecid: 80547835731,1] MOD_OC4J_0013: Failed to call destination: home's service() to service the request.
[Thu Apr 26 11:46:33 2007] [notice] FastCGI: process manager initialized (pid 21726)
[Thu Apr 26 11:46:34 2007] [notice] Oracle-Application-Server-10g/10.1.2.0.2 Oracle-HTTP-Server configured -- resuming normal operations
[Thu Apr 26 11:46:34 2007] [notice] Accept mutex: fcntl (Default: sysvsem)
[Thu Apr 26 11:46:34 2007] [warn] long lost child came home! (pid 21182)
[Thu Apr 26 11:53:32 2007] [warn] [client 10.1.20.9] oc4j_socket_recvfull timed out
[Thu Apr 26 11:53:32 2007] [error] [client 10.1.20.9] [ecid: 89138452752,1] (4)Interrupted system call: MOD_OC4J_0038: Receiving data from oc4j exceeded the configured "Timeout" value and the error code is 4.
[Thu Apr 26 11:53:32 2007] [error] [client 10.1.20.9] [ecid: 89138452752,1] MOD_OC4J_0054: Failed to call network routine to receive an ajp13 message from oc4j.
[Thu Apr 26 11:53:32 2007] [error] [client 10.1.20.9] [ecid: 89138452752,1] MOD_OC4J_0033: Failed to receive an ajp13 message from oc4j.
[Thu Apr 26 11:53:32 2007] [warn] [client 10.1.20.9] [ecid: 89138452752,1] MOD_OC4J_0078: Network connection errors happened to host: lawdb.keralalawsect.org and port: 12501 while receiving the first response from oc4j. This request is recoverable.
[Thu Apr 26 11:53:32 2007] [error] [client 10.1.20.9] [ecid: 89138452752,1] MOD_OC4J_0121: Failed to service request with network worker: home_15 and it is not recoverable.
[Thu Apr 26 11:53:32 2007] [error] [client 10.1.20.9] [ecid: 89138452752,1] MOD_OC4J_0013: Failed to call destination: home's service() to service the request.
Please HELP ME...

Hi this is what the solution given by your link
A.1.6 Connection Timeouts Through a Stateful Firewall Affect System Performance
Problem
To improve performance the mod_oc4j component in each Oracle HTTP Server process maintains open TCP connections to the AJP port within each OC4J instance it sends requests to.
In situations where a firewall exists between OHS and OC4J, packages sent via AJP are rejected if the connections can be idle for periods in excess of the inactivity timeout of stateful firewalls.
However, the AJP socket is not closed; as long as the socket remains open, the worker thread is tied to it and is never returned to the thread pool. OC4J will continue to create more threads, and will eventually exhaust system resources.
Solution
The OHS TCP connection must be kept "alive" to avoid firewall timeout issues. This can be accomplished using a combination of OC4J configuration parameters and Apache runtime properties.
Set the following parameters in the httpd.conf or mod_oc4j.conf configuration files. Note that the value of Oc4jConnTimeout sets the length of inactivity, in seconds, before the session is considered inactive.
Oc4jUserKeepalive on
Oc4jConnTimeout 12000 (or a similar value)
Also set the following AJP property at OC4J startup to enable OC4J to close AJP sockets in the event that a connection between OHS and OC4J is dropped due to a firewall timeout:
ajp.keepalive=true
For example:
java -Dajp.keepalive=true -jar oc4j.jar
Please tell me where or which file i should put the option
java -Dajp.keepalive=true -jar oc4j.jar ??????/

Hi from the last two days my iphone have very slow to open the apps and very slow when i check the notification window , it taking too much time to open when i tap to down . help me to resolve the issue.

Hi, from the last two days my iphone( iphone 4 with ios 5) have very slow to open the apps and very slow when i check the notification window , it taking too much time to open when i tap to down . help me to resolve the issue.

The Basic Troubleshooting Steps are:
Restart... Reset... Restore...
iPhone Reset
http://support.apple.com/kb/ht1430
Try this First... You will Not Lose Any Data...
Turn the Phone Off...
Press and Hold the Sleep/Wake Button and the Home Button at the Same Time...
Wait for the Apple logo to Appear and then Disappear...
Usually takes about 15 - 20 Seconds... ( But can take Longer...)
Release the Buttons...
Turn the Phone On...
If that does not help... See Here:
Backing up, Updating and Restoring
http://support.apple.com/kb/HT1414

Itunes takes too much time to open and don´t recogneize my iphone

itunes takes too much time to open and don´t recogneize my iphone
I´ve alredy unistall and re install and didn´t work

5-10 minutes is normal for me when opening iTunes. But then my library is stored on network drive which slows everything down.
There has been many posts about problems with RAID and iTunes. Don't know if any of those relate.

Taking too much time (1min) to connect to database

Hi,
I have oracle 10.2 and 10g application server.
Its taking too much time to connect to database through application (on browser). The connection through sqlplus is fine.
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Dear AnaTech,
i am going to ask not related this question which already you answered i am going to ask you about that how to connect forms6i and Developer 10g with OracleAS.
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my database conectivity with Developer suite Forms and Reports and also Form6i and Reports6i are working fine. no problem.
now the 1 question of mine is that when i try to run form6i through run from web i got this error. FRM-99999: error 18121 occured see the release not.
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I hope you don't mind that i ask this question here and also if you give me you email then we can discuss this in detail and i can be helpful of your great expertise. i also know and utilize my 3-tier real envrionment.
Waiting for your great response.
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BPC application is taking too much time to load

Hi experts!
I'm facing a very weird problem...
We've developed a BPC application (app name: USM).
This application is taking too much time to be loaded in some computers (around 8 minutes to load). Yes, in SOME computers.
There is around 100.000 registers in the database and most coming from material master data.
If I try to load this USM application in another computer, the process loads smoothly. The computer's hardware is all the same, the server is hyper estimated and everyone is in the same network.
I talked to infrastructure departament and we made several tests. We run BPC on the server (loaded quickly), on several computers (some loads quickly, others don't), used wireless and cable connection (got all the same result) and checked communication between BW and BPC but it is ok.
After all, I tried to load APSHEL application in the same enviroment and it loaded intantly. So, I guess it is something wrong with my application. But if was this, I suppose it should happen to all computers and not only with part of them.
Have anybody ever seen something like this?
Thank you in advance.
Rubens
Edited by: Rubens Massayuki Kumori on May 12, 2011 8:43 PM
Edited by: Rubens Massayuki Kumori on May 12, 2011 8:46 PM

Hi Rubens,
I would try making a couple of test:
1. I will install the client in a machine that is located in the same network segment, or try using a vpn that comunicates with the server bypassing all security devices, only to see if the network it's the problem.
2. Making a full optimize of one application to see if maybe the problem it's related to the segmentation of the cubes (i don't think that this is the problem but give it a try).
It is very wierd that in some computers happends and in others don't... also try to clean up the local cache of the applications in those computers that are giving to you bad performce and retry.
hope it helps,

PRS600 ereader taking too much time to load all the books

Whenever I open My PRS600 from complete shutdown it takes too much time to load all the files which are present in Memory card. Is anyone else facing same issue?

Hello,
Recently, I have been having some serious issues when it comes to my Sony PRS-600. I am running on a Windows 7 64-bit, and an updated Reader Library 3.3
The issue comes when transferring books to the e-reader from the library, and from the e-reader to a collection. The problem is that the software becomes intolerably slow while it's processing the command. The Reader Library software window grays out, displays (Not Working) and if clicked on it, shades to a white color and displays either "cancel operation" or "wait until program responds". If I do close the operation, it appears as if the e-reader doesn't follow the operation and still displays "Do not disconnect". Since I do not see any other way to disconnect (other than the eject option), I remove the USB plug which causes a bit more issues with the reader (such as removing all of my collections, for example!).
But anyway, that's not the main issue here. The main issue is that the book transferring is really slow. I need to wait a couple of minutes (or even more) just for the software to process. Moving just 1 MB of data requires so much time as if it's 1 GB. Sometimes it's random and does it fast, and sometimes the application is better not to be dealt with at all while it's processing the command. If I would inspect My Computer, the simple loading of the e-reader storage icons and information would make the Windows Explorer to "crash" (e.g, close all windows and then reopen them). It just happens that in all randomness even the creation of a collection makes the software slow.
So to recap: the reader software is slow when adding and moving books.
I hope someone will help me resolve this annoyance.
Thank you,
KQ

T400 takes too much time to start or shutdown

I got a lenovo thinkpad T400, everything seems to be fine but lot of issues.
1. It takes too much time to start or shutdown (I purchased 2GB turbo memory along with the system for $50, but no use).My system is slower than 2.2 GHz(mine is 2.53GHz)
2.Fingerprint Reader: When I tried to login using my fingerprint reader it gives an error message "computer is locked only authorized user can login", when we need to type in Password every time, why Finger print reader is used ?
Connectivity: All laptops around can see all networks but not mine, my system couldn't see any networks. Why ?
4. System strucks suddenly staying irresponsible for while.!!!!!!!!!!!
When I tried to talk to CSR, they instructed to format my system using the CD's which they are going to send.When I tried to do so; an error message occurred when I inserted second CD ,that "please insert suitable/matchable(don't remember exactly) CD.
I have other question; the CD's sent by lenovo are not AUTO PLAYABLE ?

what if you press your blue thinkvantage button during startup? does it take you to the recovery partition?
Regards,
Jin Li
May this year, be the year of 'DO'!
I am a volunteer, and not a paid staff of Lenovo or Microsoft

Bought i phone 6 64 GB just 3 days before performance is very bad.Couldn't even open app store it takes too much time for opening a web page.

bought i phone 6 64 GB just 3 days before performance is very bad.Couldn't even open app store it takes too much time for opening a web page.

You may need to reset your network settings, making sure the network you're accessing is stable: tap Settings > General > Reset > Reset Network Settings.
If your iPhone still can't connect to App Store, tap Settings > iTunes & App Store > tap the Apple ID and sign out > later, sign in with your Apple ID.

Serial port vi taking too much time to communicate?

i am using visa vis for serial communication the read vi takes too much time to give me the bytes at serial port.what should i do to decrease the delay?

You wouldn't happen to be specifying a byte count to read or setting read termination when a specific character is read would you? If you are, if you don't have the right number of bytes in the serial buffer or if the termination character is not seen, then VISA read will wait for the time specifed by the VISA timeout value. To fix the first problem, use the VISA Bytes at Serial Port function to determine how many bytes to read. In the second case, use a VISA property node to set Message Based Settings:Termination Character Enable to false and Serial Settingserial End Mode for Reads to none.

SELECT query takes too much time! Y?

Plz find my SELECT query below:
select w~mandt
wvbeln wposnr wmeins wmatnr wwerks wnetwr
wkwmeng wvrkme wmatwa wcharg w~pstyv
wposar wprodh wgrkor wantlf wkztlf wlprio
wvstel wroute wumvkz wumvkn wabgru wuntto
wawahr werdat werzet wfixmg wprctr wvpmat
wvpwrk wmvgr1 wmvgr2 wmvgr3 wmvgr4 wmvgr5
wbedae wcuobj w~mtvfp
xetenr xwmeng xbmeng xettyp xwepos xabart
x~edatu
xtddat xmbdat xlddat xwadat xabruf xetart
x~ezeit
into table t_vbap
from vbap as w
inner join vbep as x on xvbeln = wvbeln and
xposnr = wposnr and
xmandt = wmandt
where
( ( werdat > pre_dat ) and ( werdat <= w_date ) ) and
( ( ( erdat > pre_dat and erdat < p_syndt ) or
( erdat = p_syndt and erzet <= p_syntm ) ) ) and
w~matnr in s_matnr and
w~pstyv in s_itmcat and
w~lfrel in s_lfrel and
w~abgru = ' ' and
w~kwmeng > 0 and
w~mtvfp in w_mtvfp and
x~ettyp in w_ettyp and
x~bdart in s_req_tp and
x~plart in s_pln_tp and
x~etart in s_etart and
x~abart in s_abart and
( ( xlifsp in s_lifsp ) or ( xlifsp = ' ' ) ).
The problem: It takes too much time while executing this statement.
Could anybody change this statement and help me out to reduce the DB Access time?
Thx

Ways of Performance Tuning
1.     Selection Criteria
2.     Select Statements
     Select Queries
     SQL Interface
     Aggregate Functions
     For all Entries
Select Over more than one internal table
Selection Criteria
1.     Restrict the data to the selection criteria itself, rather than filtering it out using the ABAP code using CHECK statement.
2.     Select with selection list.
SELECT * FROM SBOOK INTO SBOOK_WA.
CHECK: SBOOK_WA-CARRID = 'LH' AND
         SBOOK_WA-CONNID = '0400'.
ENDSELECT.
The above code can be much more optimized by the code written below which avoids CHECK, selects with selection list
SELECT CARRID CONNID FLDATE BOOKID FROM SBOOK INTO TABLE T_SBOOK
WHERE SBOOK_WA-CARRID = 'LH' AND
              SBOOK_WA-CONNID = '0400'.
Select Statements   Select Queries
1.     Avoid nested selects
SELECT * FROM EKKO INTO EKKO_WA.
SELECT * FROM EKAN INTO EKAN_WA
      WHERE EBELN = EKKO_WA-EBELN.
ENDSELECT.
ENDSELECT.
The above code can be much more optimized by the code written below.
SELECT PF1 PF2 FF3 FF4 INTO TABLE ITAB
    FROM EKKO AS P INNER JOIN EKAN AS F
      ON PEBELN = FEBELN.
Note: A simple SELECT loop is a single database access whose result is passed to the ABAP program line by line. Nested SELECT loops mean that the number of accesses in the inner loop is multiplied by the number of accesses in the outer loop. One should therefore use nested SELECT loops only if the selection in the outer loop contains very few lines or the outer loop is a SELECT SINGLE statement.
2.     Select all the records in a single shot using into table clause of select statement rather than to use Append statements.
SELECT * FROM SBOOK INTO SBOOK_WA.
CHECK: SBOOK_WA-CARRID = 'LH' AND
         SBOOK_WA-CONNID = '0400'.
ENDSELECT.
The above code can be much more optimized by the code written below which avoids CHECK, selects with selection list and puts the data in one shot using into table
SELECT CARRID CONNID FLDATE BOOKID FROM SBOOK INTO TABLE T_SBOOK
WHERE SBOOK_WA-CARRID = 'LH' AND
              SBOOK_WA-CONNID = '0400'.
3.     When a base table has multiple indices, the where clause should be in the order of the index, either a primary or a secondary index.
To choose an index, the optimizer checks the field names specified in the where clause and then uses an index that has the same order of the fields. In certain scenarios, it is advisable to check whether a new index can speed up the performance of a program. This will come handy in programs that access data from the finance tables.
4.     For testing existence, use Select.. Up to 1 rows statement instead of a Select-Endselect-loop with an Exit.
SELECT * FROM SBOOK INTO SBOOK_WA
UP TO 1 ROWS
WHERE CARRID = 'LH'.
ENDSELECT.
The above code is more optimized as compared to the code mentioned below for testing existence of a record.
SELECT * FROM SBOOK INTO SBOOK_WA
    WHERE CARRID = 'LH'.
EXIT.
ENDSELECT.
5.     Use Select Single if all primary key fields are supplied in the Where condition .
If all primary key fields are supplied in the Where conditions you can even use Select Single.
Select Single requires one communication with the database system, whereas Select-Endselect needs two.
Select Statements SQL Interface
1.     Use column updates instead of single-row updates
to update your database tables.
SELECT * FROM SFLIGHT INTO SFLIGHT_WA.
SFLIGHT_WA-SEATSOCC =
    SFLIGHT_WA-SEATSOCC - 1.
UPDATE SFLIGHT FROM SFLIGHT_WA.
ENDSELECT.
The above mentioned code can be more optimized by using the following code
UPDATE SFLIGHT
       SET SEATSOCC = SEATSOCC - 1.
2.     For all frequently used Select statements, try to use an index.
SELECT * FROM SBOOK CLIENT SPECIFIED INTO SBOOK_WA
WHERE CARRID = 'LH'
    AND CONNID = '0400'.
ENDSELECT.
The above mentioned code can be more optimized by using the following code
SELECT * FROM SBOOK CLIENT SPECIFIED INTO SBOOK_WA
WHERE MANDT IN ( SELECT MANDT FROM T000 )
    AND CARRID = 'LH'
    AND CONNID = '0400'.
ENDSELECT.
3.     Using buffered tables improves the performance considerably.
Bypassing the buffer increases the network considerably
SELECT SINGLE * FROM T100 INTO T100_WA
BYPASSING BUFFER
WHERE     SPRSL = 'D'
        AND ARBGB = '00'
        AND MSGNR = '999'.
The above mentioned code can be more optimized by using the following code
SELECT SINGLE * FROM T100 INTO T100_WA
WHERE     SPRSL = 'D'
        AND ARBGB = '00'
        AND MSGNR = '999'.
Select Statements Aggregate Functions
     If you want to find the maximum, minimum, sum and average value or the count of a database column, use a select list with aggregate functions instead of computing the aggregates yourself.
Some of the Aggregate functions allowed in SAP are MAX, MIN, AVG, SUM, COUNT, COUNT( * )
Consider the following extract.
            Maxno = 0.
            Select * from zflight where airln = LF and cntry = IN.
             Check zflight-fligh > maxno.
             Maxno = zflight-fligh.
            Endselect.
The above mentioned code can be much more optimized by using the following code.
Select max( fligh ) from zflight into maxno where airln = LF and cntry = IN.
Select Statements For All Entries
     The for all entries creates a where clause, where all the entries in the driver table are combined with OR. If the number of entries in the driver table is larger than rsdb/max_blocking_factor, several similar SQL statements are executed to limit the length of the WHERE clause.
     The plus
     Large amount of data
     Mixing processing and reading of data
     Fast internal reprocessing of data
     Fast
     The Minus
     Difficult to program/understand
     Memory could be critical (use FREE or PACKAGE size)
Points to be must considered FOR ALL ENTRIES
     Check that data is present in the driver table
     Sorting the driver table
     Removing duplicates from the driver table
Consider the following piece of extract
          Loop at int_cntry.
Select single * from zfligh into int_fligh
where cntry = int_cntry-cntry.
Append int_fligh.
                      Endloop.
The above mentioned can be more optimized by using the following code.
Sort int_cntry by cntry.
Delete adjacent duplicates from int_cntry.
If NOT int_cntry[] is INITIAL.
            Select * from zfligh appending table int_fligh
            For all entries in int_cntry
            Where cntry = int_cntry-cntry.
Endif.
Select Statements Select Over more than one Internal table
1.     Its better to use a views instead of nested Select statements.
SELECT * FROM DD01L INTO DD01L_WA
WHERE DOMNAME LIKE 'CHAR%'
        AND AS4LOCAL = 'A'.
SELECT SINGLE * FROM DD01T INTO DD01T_WA
    WHERE   DOMNAME    = DD01L_WA-DOMNAME
        AND AS4LOCAL   = 'A'
        AND AS4VERS    = DD01L_WA-AS4VERS
        AND DDLANGUAGE = SY-LANGU.
ENDSELECT.
The above code can be more optimized by extracting all the data from view DD01V_WA
SELECT * FROM DD01V INTO DD01V_WA
WHERE DOMNAME LIKE 'CHAR%'
        AND DDLANGUAGE = SY-LANGU.
ENDSELECT
2.     To read data from several logically connected tables use a join instead of nested Select statements. Joins are preferred only if all the primary key are available in WHERE clause for the tables that are joined. If the primary keys are not provided in join the Joining of tables itself takes time.
SELECT * FROM EKKO INTO EKKO_WA.
SELECT * FROM EKAN INTO EKAN_WA
      WHERE EBELN = EKKO_WA-EBELN.
ENDSELECT.
ENDSELECT.
The above code can be much more optimized by the code written below.
SELECT PF1 PF2 FF3 FF4 INTO TABLE ITAB
    FROM EKKO AS P INNER JOIN EKAN AS F
      ON PEBELN = FEBELN.
3.     Instead of using nested Select loops it is often better to use subqueries.
SELECT * FROM SPFLI
INTO TABLE T_SPFLI
WHERE CITYFROM = 'FRANKFURT'
    AND CITYTO = 'NEW YORK'.
SELECT * FROM SFLIGHT AS F
    INTO SFLIGHT_WA
    FOR ALL ENTRIES IN T_SPFLI
    WHERE SEATSOCC < F~SEATSMAX
      AND CARRID = T_SPFLI-CARRID
      AND CONNID = T_SPFLI-CONNID
      AND FLDATE BETWEEN '19990101' AND '19990331'.
ENDSELECT.
The above mentioned code can be even more optimized by using subqueries instead of for all entries.
SELECT * FROM SFLIGHT AS F INTO SFLIGHT_WA
    WHERE SEATSOCC < F~SEATSMAX
      AND EXISTS ( SELECT * FROM SPFLI
                     WHERE CARRID = F~CARRID
                       AND CONNID = F~CONNID
                       AND CITYFROM = 'FRANKFURT'
                       AND CITYTO = 'NEW YORK' )
      AND FLDATE BETWEEN '19990101' AND '19990331'.
ENDSELECT.
1.     Table operations should be done using explicit work areas rather than via header lines.
READ TABLE ITAB INTO WA WITH KEY K = 'X BINARY SEARCH.
IS MUCH FASTER THAN USING
READ TABLE ITAB INTO WA WITH KEY K = 'X'.
If TAB has n entries, linear search runs in O( n ) time, whereas binary search takes only O( log2( n ) ).
2.     Always try to use binary search instead of linear search. But dont forget to sort your internal table before that.
READ TABLE ITAB INTO WA WITH KEY K = 'X'. IS FASTER THAN USING
READ TABLE ITAB INTO WA WITH KEY (NAME) = 'X'.
3.     A dynamic key access is slower than a static one, since the key specification must be evaluated at runtime.
4.     A binary search using secondary index takes considerably less time.
5.     LOOP ... WHERE is faster than LOOP/CHECK because LOOP ... WHERE evaluates the specified condition internally.
LOOP AT ITAB INTO WA WHERE K = 'X'.
ENDLOOP.
The above code is much faster than using
LOOP AT ITAB INTO WA.
CHECK WA-K = 'X'.
ENDLOOP.
6.     Modifying selected components using MODIFY itab TRANSPORTING f1 f2.. accelerates the task of updating a line of an internal table.
WA-DATE = SY-DATUM.
MODIFY ITAB FROM WA INDEX 1 TRANSPORTING DATE.
The above code is more optimized as compared to
WA-DATE = SY-DATUM.
MODIFY ITAB FROM WA INDEX 1.
7.     Accessing the table entries directly in a "LOOP ... ASSIGNING ..." accelerates the task of updating a set of lines of an internal table considerably
Modifying selected components only makes the program faster as compared to Modifying all lines completely.
e.g,
LOOP AT ITAB ASSIGNING <WA>.
I = SY-TABIX MOD 2.
IF I = 0.
    <WA>-FLAG = 'X'.
ENDIF.
ENDLOOP.
The above code works faster as compared to
LOOP AT ITAB INTO WA.
I = SY-TABIX MOD 2.
IF I = 0.
    WA-FLAG = 'X'.
    MODIFY ITAB FROM WA.
ENDIF.
ENDLOOP.
8.    If collect semantics is required, it is always better to use to COLLECT rather than READ BINARY and then ADD.
LOOP AT ITAB1 INTO WA1.
READ TABLE ITAB2 INTO WA2 WITH KEY K = WA1-K BINARY SEARCH.
IF SY-SUBRC = 0.
    ADD: WA1-VAL1 TO WA2-VAL1,
         WA1-VAL2 TO WA2-VAL2.
    MODIFY ITAB2 FROM WA2 INDEX SY-TABIX TRANSPORTING VAL1 VAL2.
ELSE.
    INSERT WA1 INTO ITAB2 INDEX SY-TABIX.
ENDIF.
ENDLOOP.
The above code uses BINARY SEARCH for collect semantics. READ BINARY runs in O( log2(n) ) time. The above piece of code can be more optimized by
LOOP AT ITAB1 INTO WA.
COLLECT WA INTO ITAB2.
ENDLOOP.
SORT ITAB2 BY K.
COLLECT, however, uses a hash algorithm and is therefore independent
of the number of entries (i.e. O(1)) .
9.    "APPEND LINES OF itab1 TO itab2" accelerates the task of appending a table to another table considerably as compared to LOOP-APPEND-ENDLOOP.
APPEND LINES OF ITAB1 TO ITAB2.
This is more optimized as compared to
LOOP AT ITAB1 INTO WA.
APPEND WA TO ITAB2.
ENDLOOP.
10.   DELETE ADJACENT DUPLICATES accelerates the task of deleting duplicate entries considerably as compared to READ-LOOP-DELETE-ENDLOOP.
DELETE ADJACENT DUPLICATES FROM ITAB COMPARING K.
This is much more optimized as compared to
READ TABLE ITAB INDEX 1 INTO PREV_LINE.
LOOP AT ITAB FROM 2 INTO WA.
IF WA = PREV_LINE.
    DELETE ITAB.
ELSE.
    PREV_LINE = WA.
ENDIF.
ENDLOOP.
11.   "DELETE itab FROM ... TO ..." accelerates the task of deleting a sequence of lines considerably as compared to DO -DELETE-ENDDO.
DELETE ITAB FROM 450 TO 550.
This is much more optimized as compared to
DO 101 TIMES.
DELETE ITAB INDEX 450.
ENDDO.
12.   Copying internal tables by using ITAB2[ ] = ITAB1[ ] as compared to LOOP-APPEND-ENDLOOP.
ITAB2[] = ITAB1[].
This is much more optimized as compared to
REFRESH ITAB2.
LOOP AT ITAB1 INTO WA.
APPEND WA TO ITAB2.
ENDLOOP.
13.   Specify the sort key as restrictively as possible to run the program faster.
SORT ITAB BY K. makes the program runs faster as compared to SORT ITAB.
Internal Tables         contd
Hashed and Sorted tables
1.     For single read access hashed tables are more optimized as compared to sorted tables.
2.      For partial sequential access sorted tables are more optimized as compared to hashed tables
Hashed And Sorted Tables
Point # 1
Consider the following example where HTAB is a hashed table and STAB is a sorted table
DO 250 TIMES.
N = 4 * SY-INDEX.
READ TABLE HTAB INTO WA WITH TABLE KEY K = N.
IF SY-SUBRC = 0.
ENDIF.
ENDDO.
This runs faster for single read access as compared to the following same code for sorted table
DO 250 TIMES.
N = 4 * SY-INDEX.
READ TABLE STAB INTO WA WITH TABLE KEY K = N.
IF SY-SUBRC = 0.
ENDIF.
ENDDO.
Point # 2
Similarly for Partial Sequential access the STAB runs faster as compared to HTAB
LOOP AT STAB INTO WA WHERE K = SUBKEY.
ENDLOOP.
This runs faster as compared to
LOOP AT HTAB INTO WA WHERE K = SUBKEY.
ENDLOOP.

PDPageDrawContentsToWindowEx takes too much time

We are using an Acrobat plugin that renders the PDF file to a bitmap in memory.
We are using Acrobat Professional X. But same problems also appear on Acrobat 9.
We have received several problematic PDF files from our customers that is causing the call that renders the image -
PDPageDrawContentsToWindowEx() to take unreasonably long time.
My target resolutions is 600 dpi but I couldn't wait for the call to return, after more than 6 minutes I kill the process.
The same PDFs render in Acrobat with slight delay (flickering and repainting) but in reasonable time.
I have written for this problem on previous occasions (Aug 5 2010). Since then further problematic samples
show that is linked somehow with transparency being present, but not on all PDFs with transparency.
We have a fast computer so the problem is somewhere in the PDF analysis.
Trying to optimize the file didn't help.
Checking with Preflight for PDF syntax issues also didn't find anything.

I'll have to check the headers, but I KNOW that we exposed it to plugins in A9 – it was necessary since we pulled the DrawToWindow call on the Mac (carbon vs. cocoa).
What you are asking the SDK to do is going to be painful on large complex images. Drawing into an HDC/Window adds SIGNIFICANT overhead to our rendering process, since we have to do all the work in our own "bit buffer" and then copy that buffer into the OS's provided HDC. OUCH! This is why DrawToMemory is better.
Additionally, if you have files with complex transparency AND you want OverprintPreview, that's also going to be VERY complex rendering pipeline – made WORSE by the need to end up in an HDC. Forgetting separations for the moment, consider that we have to convert everything to CMYK (since you can only compute OP in CMYK), blend colors, then convert all of that to RGB. And that's assuming SIMPLE transparency. If you have multiple blending groups, soft masks, etc. then you just raised the bar even more!
How long does it take Acrobat to open up the PDF and render it completely to screen? For separations, how long does it take to do a "Flatten Transparency" operation?
UpdateRect won't help because of the OP and then transparency flattening
From: Adobe Forums <[email protected]<mailto:[email protected]>>
Reply-To: "[email protected]<mailto:[email protected]>" <[email protected]<mailto:[email protected]>>
Date: Mon, 5 Dec 2011 06:45:46 -0800
To: Leonard Rosenthol <[email protected]<mailto:[email protected]>>
Subject: PDPageDrawContentsToWindowEx takes too much time
Re: PDPageDrawContentsToWindowEx takes too much time
created by Nikolay Tasev<http://forums.adobe.com/people/Nikolay+Tasev> in Acrobat SDK - View the full discussion<http://forums.adobe.com/message/4064198#4064198

Finishing Backup takes too much time.

Finishing backup takes too much time in my system , sometimes 30 minutes even 1 hour! and sometimes right after finishing backup(before the icon in the menu bar stops) it starts to take another backup( and usually 10MB or something small !) or the estimation is wrong .
Sometimes I see my system that is taking backups hours and hours(just with small stops!)
and the speed rate I of data transfer is reduced, while I set it to be on maximum speed in Time Capsule.

And the log with Time-stamps from Console
4/6/09 2:31:24 PM /System/Library/CoreServices/backupd[2141] Starting standard backup
4/6/09 2:31:34 PM /System/Library/CoreServices/backupd[2141] Mounted network destination using URL: afp://[email protected]/Sina's%20Time%20Capsule
4/6/09 2:31:34 PM /System/Library/CoreServices/backupd[2141] Backup destination mounted at path: /Volumes/Sina's Time Capsule
4/6/09 2:31:39 PM /System/Library/CoreServices/backupd[2141] Disk image /Volumes/Sina's Time Capsule/Sina’s MacBook_0017f2347181.sparsebundle mounted at: /Volumes/Backup of Sina’s MacBook
4/6/09 2:31:39 PM /System/Library/CoreServices/backupd[2141] Backing up to: /Volumes/Backup of Sina’s MacBook/Backups.backupdb
4/6/09 2:39:45 PM /System/Library/CoreServices/backupd[2141] No pre-backup thinning needed: 862.6 MB requested (including padding), 205.56 GB available
4/6/09 2:46:52 PM /System/Library/CoreServices/backupd[2141] Bulk setting Spotlight attributes failed.
4/6/09 2:48:07 PM /System/Library/CoreServices/backupd[2141] Unable to rebuild path cache for source item. Partial source path:
4/6/09 2:48:07 PM /System/Library/CoreServices/backupd[2141] Unable to rebuild path cache for source item. Partial source path:
4/6/09 2:48:07 PM /System/Library/CoreServices/backupd[2141] Unable to rebuild path cache for source item. Partial source path:
4/6/09 2:50:06 PM /System/Library/CoreServices/backupd[2141] Unable to rebuild path cache for source item. Partial source path:
4/6/09 2:50:06 PM /System/Library/CoreServices/backupd[2141] Unable to rebuild path cache for source item. Partial source path:
4/6/09 2:57:21 PM /System/Library/CoreServices/backupd[2141] Bulk setting Spotlight attributes failed.
4/6/09 3:03:57 PM /System/Library/CoreServices/backupd[2141] Unable to rebuild path cache for source item. Partial source path:
4/6/09 3:03:58 PM /System/Library/CoreServices/backupd[2141] Unable to rebuild path cache for source item. Partial source path:
4/6/09 3:03:58 PM /System/Library/CoreServices/backupd[2141] Unable to rebuild path cache for source item. Partial source path:
4/6/09 3:12:55 PM /System/Library/CoreServices/backupd[2141] Copied 29426 files (162.6 MB) from volume Macintosh Disk.
4/6/09 3:17:36 PM /System/Library/CoreServices/backupd[2141] No pre-backup thinning needed: 678.9 MB requested (including padding), 205.56 GB available
4/6/09 3:37:18 PM /System/Library/CoreServices/backupd[2141] Bulk setting Spotlight attributes failed.
4/6/09 3:37:57 PM /System/Library/CoreServices/backupd[2141] Copied 2362 files (100.3 MB) from volume Macintosh Disk.
4/6/09 3:42:00 PM /System/Library/CoreServices/backupd[2141] Starting post-backup thinning

Too much time on network wait!

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