Slow Performance of PL/SQL procedure

Hi, I'm new in PL/SQL. I had wrote a procedure which extract data from a table and write to a text file. However, I found that this procedure took a long time to return the result. Is that anything wrong with my codes? Here is the codes, please advice.
CREATE OR REPLACE PROCEDURE DataExtract
(P_FILEDIR IN VARCHAR2, P_FILENAME IN VARCHAR2)
IS
V_FILEHANDLE UTL_FILE.FILE_TYPE;
V_PRO_DT NUMBER(08);
V_REC_TYPE CHAR(01);
TYPE CUST_REC_TYPE IS RECORD
P_CUST_ID CUSTOMER.CUST_ID%TYPE,
P_NAME CUSTOMER.NAME%TYPE,
P_MARR_STAT CUSTOMER.MARR_STAT%TYPE,
P_HOME_ADDR1 CUSTOMER.HOME_ADDR1%TYPE,
P_HOME_ADDR2 CUSTOMER.HOME_ADDR2%TYPE,
P_HOME_ADDR3 CUSTOMER.HOME_ADDR3%TYPE,
P_HOME_PST_CDE CUSTOMER.HOME_PST_CDE%TYPE,
P_HOME_PH CUSTOMER.HOME_PH%TYPE,
P_OFF_ADDR1 CUSTOMER.OFF_ADDR1%TYPE,
P_OFF_ADDR2 CUSTOMER.OFF_ADDR2%TYPE,
P_OFF_ADDR3 CUSTOMER.OFF_ADDR3%TYPE,
P_OFF_PST_CDE CUSTOMER.OFF_PST_CDE%TYPE,
P_OFF_PH CUSTOMER.OFF_PH1%TYPE,
CUST_REC CUST_REC_TYPE;
CURSOR SEARCH_CUSTOMER IS
SELECT
CRE_TM,
UPD_TM,
CUST_ID,
NAME,
MARR_STAT,
HOME_ADDR1,
HOME_ADDR2,
HOME_ADDR3,
HOME_PST_CDE,
HOME_PH,
OFF_ADDR1,
OFF_ADDR2,
OFF_ADDR3,
OFF_PST_CDE,
OFF_PH
FROM CUSTOMER
WHERE SUBSTR(UPD_TM,1,8)
= V_PRO_DT;
BEGIN
SELECT PRO_DT
INTO V_PRO_DT
FROM PROCESS_TBL;
IF SQL%NOTFOUND THEN
DBMS_OUTPUT.PUT_LINE('NOT FOUND IN PROCESS_TBL');
END IF;
V_FILEHANDLE := UTL_FILE.FOPEN (P_FILEDIR, P_FILENAME, 'w');
WX_REC_TYPE := 'H';
UTL_FILE.PUTF (V_FILEHANDLE, '%s', V_REC_TYPE);
UTL_FILE.PUTF (V_FILEHANDLE, '%s', V_PRO_DT);
UTL_FILE.NEW_LINE (V_FILEHANDLE);
OPEN SEARCH_CUSTOMER;
LOOP
FETCH SEARCH_CUSTOMER INTO
CUST_REC.V_CRE_TM,
CUST_REC.V_UPD_TM,
CUST_REC.V_CUST_NO,
CUST_REC.V_NAME,
CUST_REC.V_MARR_STAT,
CUST_REC.V_HOME_ADDR1,
CUST_REC.V_HOME_ADDR2,
CUST_REC.V_HOME_ADDR3,
CUST_REC.V_HOME_PST_CDE,
CUST_REC.V_HOME_PH,
CUST_REC.V_OFF_ADDR1,
CUST_REC.V_OFF_ADDR2,
CUST_REC.V_OFF_ADDR3,
CUST_REC.V_OFF_PST_CDE,
CUST_REC.V_OFF_PH;
IF SEARCH_CUSTOMER%NOTFOUND THEN
EXIT;
END IF;
IF SUBSTR(CUST_REC.V_CRE_TM,1,8) = V_PRO_DT THEN
V_REC_TYPE := 'A';
ELSE
V_REC_TYPE := 'U';
END IF;
UTL_FILE.PUTF (V_FILEHANDLE, '%s', V_REC_TYPE);
UTL_FILE.PUTF (V_FILEHANDLE, '%s', CUST_REC.V_CUST_NO);
UTL_FILE.PUTF (V_FILEHANDLE, '%s', CUST_REC.V_NAME);
UTL_FILE.PUTF (V_FILEHANDLE, '%s', CUST_REC.V_MARR_STAT);
UTL_FILE.PUTF (V_FILEHANDLE, '%s', CUST_REC.V_HOME_ADDR1);
UTL_FILE.PUTF (V_FILEHANDLE, '%s', CUST_REC.V_HOME_ADDR2);
UTL_FILE.PUTF (V_FILEHANDLE, '%s', CUST_REC.V_HOME_ADDR3);
UTL_FILE.PUTF (V_FILEHANDLE, '%s', CUST_REC.V_HOME_PST_CDE);
UTL_FILE.PUTF (V_FILEHANDLE, '%s', CUST_REC.V_HOME_PH);
UTL_FILE.PUTF (V_FILEHANDLE, '%s', CUST_REC.V_OFF_ADDR1);
UTL_FILE.PUTF (V_FILEHANDLE, '%s', CUST_REC.V_OFF_ADDR2);
UTL_FILE.PUTF (V_FILEHANDLE, '%s', CUST_REC.V_OFF_ADDR3);
UTL_FILE.PUTF (V_FILEHANDLE, '%s', CUST_REC.V_OFF_PST_CDE);
UTL_FILE.PUTF (V_FILEHANDLE, '%s', CUST_REC.V_OFF_PH);
UTL_FILE.NEW_LINE (V_FILEHANDLE);
END LOOP;
CLOSE SEARCH_CUSTOMER;
UTL_FILE.FCLOSE (V_FILEHANDLE);
EXCEPTION
WHEN UTL_FILE.INVALID_FILEHANDLE THEN
RAISE_APPLICATION_ERROR (-20001, 'Invalid File.');
WHEN UTL_FILE.WRITE_ERROR THEN
RAISE_APPLICATION_ERROR (-20002, 'Unable to write to file.');
END;
/

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Edited by: user6510516 on 17.7.2009 13:46

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Thanks

I can determine where the delay occurs by adding
dialog boxes at a bunch of different steps, then
monitoring them for when they appear; a little
archaic, of course, but an easy way to find this
out.You should
1. Get the start time
2. Get the current time at each step.
3. Print the results at the end.
4. Repeat a number of times to average.
>
When you say that I should not mix database code with
display code... What exactly do you mean? To be
more precise in my description, I was simply setting
a bunch of different text fields and/or check boxes,
etc., based on the result set returned. It was not
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I am not running this code on the Internet, but it
has been designed to be run on a small corporate
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http://technet.microsoft.com/en-us/library/dd672789(v=sql.100).aspx
For SSIS tuning i refer below doc.
http://technet.microsoft.com/library/Cc966529#ECAA
http://msdn.microsoft.com/en-us/library/ms137622(v=sql.105).aspx
When I face issue i generally look at wait stats ,wait stats give you idea about on what resource query was waiting.
--By Jonathan KehayiasSELECT TOP 10
wait_type ,
max_wait_time_ms wait_time_ms ,
signal_wait_time_ms ,
wait_time_ms - signal_wait_time_ms AS resource_wait_time_ms ,
100.0 * wait_time_ms / SUM(wait_time_ms) OVER ( )
AS percent_total_waits ,
100.0 * signal_wait_time_ms / SUM(signal_wait_time_ms) OVER ( )
AS percent_total_signal_waits ,
100.0 * ( wait_time_ms - signal_wait_time_ms )
/ SUM(wait_time_ms) OVER ( ) AS percent_total_resource_waits
FROM sys.dm_os_wait_stats
WHERE wait_time_ms > 0 -- remove zero wait_time
AND wait_type NOT IN -- filter out additional irrelevant waits
( 'SLEEP_TASK', 'BROKER_TASK_STOP', 'BROKER_TO_FLUSH',
'SQLTRACE_BUFFER_FLUSH','CLR_AUTO_EVENT', 'CLR_MANUAL_EVENT',
'LAZYWRITER_SLEEP', 'SLEEP_SYSTEMTASK', 'SLEEP_BPOOL_FLUSH',
'BROKER_EVENTHANDLER', 'XE_DISPATCHER_WAIT', 'FT_IFTSHC_MUTEX',
'CHECKPOINT_QUEUE', 'FT_IFTS_SCHEDULER_IDLE_WAIT',
'BROKER_TRANSMITTER', 'FT_IFTSHC_MUTEX', 'KSOURCE_WAKEUP',
'LAZYWRITER_SLEEP', 'LOGMGR_QUEUE', 'ONDEMAND_TASK_QUEUE',
'REQUEST_FOR_DEADLOCK_SEARCH', 'XE_TIMER_EVENT', 'BAD_PAGE_PROCESS',
'DBMIRROR_EVENTS_QUEUE', 'BROKER_RECEIVE_WAITFOR',
'PREEMPTIVE_OS_GETPROCADDRESS', 'PREEMPTIVE_OS_AUTHENTICATIONOPS',
'WAITFOR', 'DISPATCHER_QUEUE_SEMAPHORE', 'XE_DISPATCHER_JOIN',
'RESOURCE_QUEUE' )
ORDER BY wait_time_ms DESC
use below link to analyze wait stats
http://www.sqlskills.com/blogs/paul/wait-statistics-or-please-tell-me-where-it-hurts/
HTH
PS: for reporting services you can post in SSRS forum
Please mark this reply as the answer or vote as helpful, as appropriate, to make it useful for other readers

ITunes 10.1 (64-bit) slow performance

Hello all,
I have recently bought a new pc, a very fast machine (see details below), but I'm experiencing bad performance with iTunes 10.1 (64-bit) for windows.
I don't have a lot of stuff in iTunes, I have about 120 apps, 500 songs, 1200 photos, couple of ringtones and 0 videos in my library. The whole iTunes interface responds slowly. Like clicking on Music, Videos, my iPhone in the side menu makes iTunes freeze for a couple of seconds and then switches to the screen. Even after loading a screen iTunes is freezed for a seconds before it's responsive.
I've googled around for a while, and got some tips to disable some options in the preference window, so I've set all unnecessary things off, like: crossfadings songs, automatic update checking, looking for devices, automatic organizing, ping, genius, shared libraries, etc. but it doesn't speed up iTunes much.
It gets even worse whenever I connect my iPhone 3G (Fw 4.2.1, 16GB, Black). iTunes simply freezes for like half a minute and the pc makes a few beeping noises because of connecting an usb-device. Even Windows 7 slows down a lot while connecting. iTunes gets responsive once my iPhone appears under devices in the side menu.
Software I have constantly running in the backround are: AVG anti-virus free edition, SQL Server 2008, Steam and Skype. Turning off these softwares doesn't make a difference as well. There are no virusses or whatever on my pc. I let AVG anti-virus do a complete scan like once a week.
Taskmanager shows iTunes using about 240,000K of memory, followed by steam with 70,000k of memory and skype with 30,000k of memory.
Anyone else experiencing slow performance or know how to resolve this ?
System details:
Windows 7 64-bit
Intel i7 950 @ 3.06GHz quad core processor
6gigs of ddr3 (1600mhz) memory
Ocz vertex2 ssd (The O/S and all music, photos, apps are on this disk)
nvidia graphics card gtx460
Message was edited by: Leon49

Same with me! I recently bought a new laptop, and iTunes 9 was working just fine. It takes like 5 seconds to scroll down one line. Clicking on different tabs and things takes forever as well. I am not sure what is causing it yet, but like you, I have disabled all sorts of iTunes settings which has not helped yet. Hopefully Apple will fix this problem soon! Let me know if you find a way to solve this.
My PC Specs which are well above the minimum requirements:
Asus UL80Jt
Windows 7 64-Bit
Intel i3 330UM Dual Core Processor @ 1.2GHz (ASUS Overclocking to 1.7 GHz)
4GB RAM
1.3 GB Dedicated Video RAM
128 SSD

Need help in improving the performance for the sql query

Thanks in advance for helping me.
I was trying to improve the performance of the below query. I tried the following methods used merge instead of update, used bulk collect / Forall update, used ordered hint, created a temp table and upadated the target table using the same. The methods which I used did not improve any performance. The data count which is updated in the target table is 2 million records and the target table has 15 million records.
Any suggestions or solutions for improving performance are appreciated
SQL query:
update targettable tt
set mnop = 'G',
where ( x,y,z ) in
select a.x, a.y,a.z
from table1 a
where (a.x, a.y,a.z) not in (
select b.x,b.y,b.z
from table2 b
where 'O' = b.defg
and mnop = 'P'
and hijkl = 'UVW';

987981 wrote:
I was trying to improve the performance of the below query. I tried the following methods used merge instead of update, used bulk collect / Forall update, used ordered hint, created a temp table and upadated the target table using the same. The methods which I used did not improve any performance. And that meant what? Surely if you spend all that time and effort to try various approaches, it should mean something? Failures are as important teachers as successes. You need to learn from failures too. :-)
The data count which is updated in the target table is 2 million records and the target table has 15 million records.Tables have rows btw, not records. Database people tend to get upset when rows are called records, as records exist in files and a database is not a mere collection of records and files.
The failure to find a single faster method with the approaches you tried, points to that you do not know what the actual performance problem is. And without knowing the problem, you still went ahead, guns blazing.
The very first step in dealing with any software engineering problem, is to identify the problem. Seeing the symptoms (slow performance) is still a long way from problem identification.
Part of identifying the performance problem, is understanding the workload. Just what does the code task the database to do?
From your comments, it needs to find 2 million rows from 15 million rows. Change these rows. And then write 2 million rows back to disk.
That is not a small workload. Simple example. Let's say that the 2 million row find is 1ms/row and the 2 million row write is also 1ms/row. This means a 66 minute workload. Due to the number of rows, an increase in time/row either way, will potentially have 2 million fold impact.
So where is the performance problem? Time spend finding the 2 million rows (where other tables need to be read, indexes used, etc)? Time spend writing the 2 million rows (where triggers and indexes need to be fired and maintained)? Both?

Help with Performance tunning PL/SQL

Hi All,
I have a PL/SQL procedure, it works fine. No errors, and no bugs. However its taking forever to finish. I am using the concatenation operator (||), and I know its expensive. How can I improve performance to the procedure ?
Here is the code
create or replace
PROCEDURE POST_ADDRESS_CLEANSE AS
CURSOR C1 IS
SELECT Z.ROW_ID,
        Z.NAME
FROM STGDATA.ACCOUNT_SOURCE Z;
CURSOR C2 IS
SELECT DISTINCT CLEANSED_NAME || CLEANSED_STREET_ADDRESS ||
        CLEANSED_STREET_ADDRESS_2 || CLEANSED_CITY || CLEANSED_STATE ||
        CLEANSED_POSTAL_CODE AS FULLRECORD
FROM    STGDATA.ACCOUNT_SOURCE_CLEANSED;
V_ROWID Number := 1;
V_FLAG VARCHAR2(30);
TEMP_ROW_ID VARCHAR2(10) := NULL;
BEGIN
-- This loop will update CLEANSED_NAME column in ACCOUNT_SOURCE_CLEANSED table.
FOR X IN C1 LOOP
    TEMP_ROW_ID := TO_CHAR(X.ROW_ID);
UPDATE STGDATA.ACCOUNT_SOURCE_CLEANSED A
SET A.CLEANSED_NAME = X.NAME
WHERE A.ROW_ID = TEMP_ROW_ID;
    COMMIT;
END LOOP;
-- This loop will update columns EM_PRIMARY_FLAG, EM_GROUP_ID in ACCOUNT_SOURCE_CLEANSED table
FOR Y IN C2 LOOP
    UPDATE STGDATA.ACCOUNT_SOURCE_CLEANSED
    SET     EM_GROUP_ID = V_ROWID
    WHERE   CLEANSED_NAME || CLEANSED_STREET_ADDRESS || CLEANSED_STREET_ADDRESS_2 ||
            CLEANSED_CITY || CLEANSED_STATE || CLEANSED_POSTAL_CODE = Y.FULLRECORD;
    UPDATE STGDATA.ACCOUNT_SOURCE_CLEANSED
    SET     EM_PRIMARY_FLAG = 'Y'
    WHERE   CLEANSED_NAME || CLEANSED_STREET_ADDRESS || CLEANSED_STREET_ADDRESS_2 ||
            CLEANSED_CITY || CLEANSED_STATE || CLEANSED_POSTAL_CODE = Y.FULLRECORD
    AND     ROWNUM = 1;
    V_ROWID := V_ROWID + 1;
    COMMIT;
END LOOP;
UPDATE STGDATA.ACCOUNT_SOURCE_CLEANSED
SET     EM_PRIMARY_FLAG = 'N'
WHERE   EM_PRIMARY_FLAG IS NULL;
COMMIT;
--dbms_output.put_line('V_ROW:'||V_ROWID);
--dbms_output.put_line('CLEANSED_NAME:'||Y.FULLRECORD);
END POST_ADDRESS_CLEANSE;
Thanks in advance.
Message was edited by: Rooney -- added code using syntax highlight

I was able to modify my code a bit, however I don't see a way of not using loops.
In the loop, I am updating 2 columns. EM_PRIMARY_FLAG, and EM_GROUP_ID. The data I am working with has duplicate records, and that is why I am using a distinct in the cursor. The requirements are is to make one record a primary record, and the rest are reference records. What makes my record primary is updating column EM_PRIMARY_FLAG with a 'Y', and updating EM_GROUP_ID with a number combines all duplicate records into a group.
In the procedure, I am getting the distinct records, looping through each one, and then doing 2 updates:
1 - Update EM_PRIMARY_FLAG to 'Y' where rownum = 1, this will set one record to be primary
2 - Update EM_GROUP_ID to a number (V_ROWID := V_ROWID + 1) where V_ROWID starts from 1, to group all records into a set.
Here is my latest code after modifying it:
create or replace
PROCEDURE POST_ADDRESS_CLEANSE AS
CURSOR C1 IS
SELECT      DISTINCT NVL(CLEANSED_NAME, '') AS NAME_CLEANSED,
                  NVL(CLEANSED_STREET_ADDRESS, '') AS ADDRESS_CLEANSED,
                  NVL(CLEANSED_STREET_ADDRESS_2, '') AS ADDRESS2_CLEANSED,
                  NVL(CLEANSED_CITY, '') AS CITY_CLEANSED,
                  NVL(CLEANSED_STATE, '') AS STATE_CLEANSED,
                  NVL(CLEANSED_POSTAL_CODE, '') AS POSTAL_CODE_CLEANSED
FROM        STGDATA.ACCOUNT_SOURCE_CLEANSED;
V_ROWID Number := 1;
V_FLAG VARCHAR2(30);
TEMP_ROW_ID VARCHAR2(10) := NULL;
BEGIN
    UPDATE STGDATA.ACCOUNT_SOURCE_CLEANSED A
    SET A.CLEANSED_NAME = (SELECT   Z.NAME
                                                   FROM     STGDATA.ACCOUNT_SOURCE Z
                                                   WHERE    Z.ROW_ID = (SELECT TO_NUMBER(B.ROW_ID)
                                                                                       FROM    STGDATA.ACCOUNT_SOURCE_CLEANSED B
                                                                                       WHERE   B.ROW_ID = A.ROW_ID));
    COMMIT;
-- This loop will update columns EM_PRIMARY_FLAG, EM_GROUP_ID in ACCOUNT_SOURCE_CLEANSED table
FOR Y IN C1 LOOP
    UPDATE   STGDATA.ACCOUNT_SOURCE_CLEANSED
    SET          EM_GROUP_ID = V_ROWID
    WHERE    CLEANSED_NAME = Y.NAME_CLEANSED
    AND          CLEANSED_STREET_ADDRESS = Y.ADDRESS_CLEANSED
    AND          CLEANSED_STREET_ADDRESS_2 = Y.ADDRESS2_CLEANSED
    AND          CLEANSED_CITY = Y.CITY_CLEANSED
    AND          CLEANSED_STATE = Y.STATE_CLEANSED
    AND          CLEANSED_POSTAL_CODE = Y.POSTAL_CODE_CLEANSED;
    UPDATE STGDATA.ACCOUNT_SOURCE_CLEANSED
    SET     EM_PRIMARY_FLAG = 'Y'
    WHERE   CLEANSED_NAME = Y.NAME_CLEANSED
    AND     CLEANSED_STREET_ADDRESS = Y.ADDRESS_CLEANSED
    AND     CLEANSED_STREET_ADDRESS_2 = Y.ADDRESS2_CLEANSED
    AND     CLEANSED_CITY = Y.CITY_CLEANSED
    AND     CLEANSED_STATE = Y.STATE_CLEANSED
    AND     CLEANSED_POSTAL_CODE = Y.POSTAL_CODE_CLEANSED
    AND     ROWNUM = 1;
    V_ROWID := V_ROWID + 1;
END LOOP;
COMMIT;
UPDATE STGDATA.ACCOUNT_SOURCE_CLEANSED
SET     EM_PRIMARY_FLAG = 'N'
WHERE   EM_PRIMARY_FLAG IS NULL;
COMMIT;
END POST_ADDRESS_CLEANSE;
Thanks
Message was edited by: Rooney - Just added the code in SQL block using syntax highlight.

Slow Performance of PL/SQL procedure

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