Slow query response time

Morning SQL gurus,
Running queries on APEX takes very long compared to running the script directly on the database.
I tried setting optimizer mode to all_rows, used driving_site and index hints, any other suggestions? The scripts on Apex and DB make use of a db :-/
Regards,
Pirate
Edited by: Pirate on Jun 22, 2011 11:04 AM

This is the fourm for issues with the SQL Developer tool. You will get better answers in the Apex forum or the SQL and PL/SQL forum.

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Fact Dimension Attribute causing extreme slow query response

I am using SSAS OLAP in SQL Server 2012. My server has 16 GB or RAM - it has only OLAP engine that is being used - nothing related to the relational engine. My fact table has a column called Product Status - for which I've a Fact dimension. Fact table has
18M rows, but the Product Staus has only 2-3 distinct values. When my users bring that attribute in their analysis, the response time is very slow - 10 to 15 minutes. Can anyone share their experiences with how I can go about optimizing this?
I tried to use the user based optimization, but the wizard suggests no aggregations.
Thanks!
GBM

Hi GBM,
For a cube of moderate to large size, partitions can greatly improve query performance, load performance, and ease of cube maintenance. Have you define partitions in your cube? Here is a good article regaridng Analysis Services Query Performance Top 10 Best
Practices for your reference, please see:
http://technet.microsoft.com/en-us/library/cc966527.aspx
To troubheshoot MDX query performance issue, we can create a trace to capture some events for further investigation in this case. Please see the articles below how to troubleshoot SSAS MDX query performance issue:
http://social.msdn.microsoft.com/Forums/sqlserver/en-US/f1f57e7b-eced-4009-b635-3ebb1d7fa5b0/how-do-i-troubleshoot-the-slow-mdx-query-performance
http://www.mssqltips.com/sqlservertip/2886/improving-sql-server-analysis-services-query-response-time-with-msmdsrv/
Hope this helps.
Regards,
Elvis Long
TechNet Community Support

Rules of thumb for acceptable query response times?

Once I read a statement from SAP which said that users typically tolerate
response times up to 7 seconds. So you should strive to achive this goal.
Unfortunately I cannot remember in which document or webpage this
statement was made. Does anybody happen to have a reference for this rule
or any other SAP rules about the BW query response times?
Regards,
Mark

Share with us the situations where your query is running slow. How many rows are you returning via SQL Commands?
On reports; the maximum row count being returned and/or the pagination scheme can have impact on performance.
Jeff

Help required in optimizing the query response time

Hi,
I am working on a application which uses a jdbc thin client. My requirement is to select all the table rows in one table and use the column values to select data in another table in another database.
The first table can have maximum of 6 million rows but the second table rows will be around 9000.
My first query is returning within 30-40 milliseconds when the table is having 200000 rows. But when I am iterating the result set and query the second table the query is taking around 4 millisecond for each query.
the second query selection criteria is to find the value in the range .
for example my_table ( varchar2 column1, varchar2 start_range, varchar2 end_range);
My first query returns a result which then will be used to select using the following query
select column1 from my_table where start_range < my_value and end_range> my_value;
I have created an index on start_range and end_range. this query is taking around 4 millisseconds which I think is too much.
I am using a preparedStatement for the second query loop.
Can some one suggest me how I can improve the query response time?
Regards,
Shyam

Try the code below.
Pre-requistee: you should know how to pass ARRAY objects to oracle and receive resultsets from java. There are 1000s of samples available on net.
I have written a sample db code for the same interraction.
Procedure get_list takes a array input from java and returns the record set back to java. You can change the tablenames and the creteria.
Good luck.
DROP TYPE idlist;
CREATE OR REPLACE TYPE idlist AS TABLE OF NUMBER;
CREATE OR REPLACE PACKAGE mypkg1
AS
   PROCEDURE get_list (myval_list idlist, orefcur OUT sys_refcursor);
END mypkg1;
CREATE OR REPLACE PACKAGE BODY mypkg1
AS
   PROCEDURE get_list (myval_list idlist, orefcur OUT sys_refcursor)
   AS
      ctr   NUMBER;
   BEGIN
      DBMS_OUTPUT.put_line (myval_list.COUNT);
      FOR x IN (SELECT object_name, object_id, myvalue
                  FROM user_objects a,
                       (SELECT myval_list (ROWNUM + 1) myvalue
                          FROM TABLE (myval_list)) b
                 WHERE a.object_id < b.myvalue)
      LOOP
         DBMS_OUTPUT.put_line (   x.object_name
                               || ' - '
                               || x.object_id
                               || ' - '
                               || x.myvalue
      END LOOP;
   END;
END mypkg1;
[pre]
Testing the code above. Make sure dbms output is ON.
[pre]
DECLARE
   a      idlist;
   refc   sys_refcursor;
   c number;
BEGIN
   SELECT x.nu
   BULK COLLECT INTO a
     FROM (SELECT 5000 nu
             FROM DUAL) x;
   mypkg1.get_list (a, refc);
END;
[pre]
Vishal V.

How to obtain the Query Response Time of a query?

Given the Average Length of Row of tables and the number of rows in each table,
is there a way we get the query response time of a query involving
those tables. Query includes joins as well.
For example, suppose there 3 tables t1, t2, t3. I wish to obtain the
time it takes for the following query:
Query
SELECT t1.col1, t2.col2
FROM t1, t2, t3
WHERE t1.col1 = t2.col2
AND t1.col2 IN ('a', 'c', 'd')
AND t2.col1 = t3.col2
AND t2.col1 = t1.col1 (+)
ORDER BY t1.col1
Given are:
Average Row Length of t1 = 200 bytes
Average Row Length of t2 = 100 bytes
Average Row Length of t3 = 500 bytes
No of rows in t1 = 100
No of rows in t2 = 1000
No of rows in t3 = 500
What is required is the 'query response time' for the said query.

I do not know how to do it myself. But if you are running Oracle 10g, I believe that there is a new tool called: SQL Tuning Advisor which might be able to help.
Here are some links I found doing a google search, and it looks like it might meet your needs and even give you more information on how to improve your code.
http://www.databasejournal.com/features/oracle/article.php/3492521
http://www.databasejournal.com/features/oracle/article.php/3387011
http://www.oracle.com/technology/obe/obe10gdb/manage/perflab/perflab.htm
http://www.oracle.com/technology/pub/articles/10gdba/week18_10gdba.html
http://www.oracle-base.com/articles/10g/AutomaticSQLTuning10g.php
Have fun reading:
You can get help from teachers, but you are going to have to learn a lot by yourself, sitting alone in a room ....Dr. Seuss
Regards
Tim

Slow query execution time

Hi,
I have a query which fetches around 100 records from a table which has approximately 30 million records. Unfortunately, I have to use the same table and can't go ahead with a new table.
The query executes within a second from RapidSQL. The problem I'm facing is it takes more than 10 minutes when I run it through the Java application. It doesn't throw any exceptions, it executes properly.
The query:
SELECT aaa, bbb, SUM(ccc), SUM(ddd), etc
FROM MyTable
WHERE SomeDate= date_entered_by_user AND SomeString IN ("aaa","bbb")
GROUP BY aaa,bbbI have an existing clustered index on SomeDate and SomeString fields.
To check I replaced the where clause with
WHERE SomeDate= date_entered_by_user AND SomeString = "aaa"No improvements.
What could be the problem?
Thank you,
Lobo

It's hard for me to see how a stored proc will address this problem. I don't think it changes anything. Can you explain? The problem is slow query execution time. One way to speed up the execution time inside the RDBMS is to streamline the internal operations inside the interpreter.
When the engine receives a command to execute a SQL statement, it does a few things before actually executing the statement. These things take time. First, it checks to make sure there are no syntax errors in the SQL statement. Second, it checks to make sure all of the tables, columns and relationships "are in order." Third, it formulates an execution plan. This last step takes the most time out of the three. But, they all take time. The speed of these processes may vary from product to product.
When you create a stored procedure in a RDBMS, the processes above occur when you create the procedure. Most importantly, once an execution plan is created it is stored and reused whenever the stored procedure is ran. So, whenever an application calls the stored procedure, the execution plan has already been created. The engine does not have to anaylze the SELECT|INSERT|UPDATE|DELETE statements and create the plan (over and over again).
The stored execution plan will enable the engine to execute the query faster.
/>

How to get query response time from ST03 via a script ?

Hello People,
I am trying to get average query response time for BW queries with a script (for monitoring/historisation).
I know that this data can be found manually in ST03n in the "BI workload'.
However, I don't know how to get this stat from a script.
My idea is to run a SQL query to get this information, here is the state of my query :
select count(*) from sapbw.rsddstat_olap
where calday = 20140401
and (eventid = 3100 or eventid = 3010)
and steptp = 'BEX3'
The problem is that this query is not returning the same number of navigations as the number shown in ST03n.
Can you help me to set the correct filters to get the same number of navigation as in ST03n ?
Regards.

Hi Experts,
Do you have ideas for this SQL query ?
Regards.

How to get Query response Time?

II am on BI 7.0. I ran some queries using RSRT command. I want to find how much time the queries took.
I went to
st03 -> expert mode -> BI system load-> select today / week/month according to the query runtime day
I do not see any Info Providers. Query was on a cube so why no Info Providers.
Does something have to turned on InfoPorvider to show.
When I look in RSDDSTAT_OLAP table, I do see many rows but cannot make any sense. Is there some documentation on how to get total query time from this table?
Is there any other way to get query response time?
Thanks a lot.

HI,
why not use RSRT ? You can add database statistics option in "Execut & Debug" and you get all the runtime metrics of your query
In transaction RSRT, enter the query name and press u2018Execute +Debugu2019.
Selecting u2018Display Statistics Datau2019 .
After executing the query will return a list of the measured metrics.
The event id / text describes the steps (duration in seconds):
"OLAP: Read data" gives the SQL statements repsonse time (ok - because the SAP
application server acts as an Oracle client a little network traffic from the db server is included,
but as far as you not transferring zillions of rows it can be ignored)
But it gives you much more (i.e. if the OLAP cache gets used or not )...
In the "Aggreagate statistcs" you get all the infoproviders involved in that query.
bye
yk

Will the problems I am having with slow Safari response times continue if I port the image of my 4 to an new iphone 5?

As in many families, I am ready to upgrade my iphone 4 to a 5 and pass on my 4 to my partner (who has my old 3), BUT I am resistant to do so because I have been having problems with Safari, (very slow response time) ever since I upgraded to the new OS a month or so back. I have completed all the cleaning tips (cookies, individual app shut downs) and hard boot steps with no change. I can sit my partners Iphone 3 next to my 4 and when using Safari it beats it hands down, almost doubling the time it takes on the 3. My 4 is quicker on all the other apps so I don't believe it is a hardware issue. My tests were done using our home wi fi set up the same on both phones after running all the cleaning tips on both.
I actually broke down and called the support line and the first level support told me if I upgraded to the 5 I would likely carry the problem to the new phone. She said she suspected malware or a virus and that for $300 she could forward me to second level support that could scan my phone and see what the problem is on my 4 and support any issues on a new iphone 5 OR for a one time lower fee $79, just help me fix my 4.
Thinking through her options, I chose none of the above. Seems like I should be able to either 1) isolate the issue myself with the help of this forum or 2) upgrade to the iphone 5 and if the problem follows to the new one, get the support via the new device warranty. If the support person is correct and the problem is in the software and would follow the device, then in theroy I could wipe and restore my old 4 with the back up/data of my partners 3 and the problem on the 4 should be resolved.
I really don't want to carry the problem to a new phone if I can fix the issue first. I have airwatch software to push my work email to my phone and that is usually a pain to do when I upgrade anyhow. I don't need to pay for a new phone that has the same problem as my old one. I will get grief from my partner for passing on an issue that will come up with the daily use of the old iphone 4 that I will be responsible to fix anyhow. I have invested too much time already to generate problems on both our phones. Thanks in advance for any tips or guideance about a streamlined way forward.

Basic troubleshooting from the User's Guide is reset, restart, restore (first from backup then as new). Has any of this been tried?
FYI, there are no viruses that affect iOS unless the device has been hacked or jailbroken, in which case they cannot be discussed here.

Spatial Query Response Time

O/S - Sun Solaris
ver - Oracle 8.1.7
I am trying to improve the response time of the following query. Both tables contain polygons.
select a.data_id, a.GEOLOC from information_data a, shape_data b where a.info_id = 2 and b.shape_id = 271 and sdo_filter(a.GEOLOC,b.GEOLOC,'querytype=window')='TRUE'
The response time with info_id not indexed is 9 seconds. When I index info_id, I get the following error. Why is indexing info_id causing a spatial index error ? Also, other than manipulating the tiling level, is there anything else that could improve the response time ?
ERROR at line 1:
ORA-29902: error in executing ODCIIndexStart() routine
ORA-13208: internal error while evaluating [window SRID does not match layer
SRID] operator
ORA-06512: at "MDSYS.SDO_INDEX_METHOD", line 84
ORA-06512: at line 1
Thanks,
Ravi.

Hello Ravi,
Both layers should have SDO_SRID values set in order for the index to work properly.
After you do that you might want to add an Oracle hint to the query:
select /*+ ordered */ a.data_id, a.GEOLOC
from shape_data b, information_data a
where a.info_id = 2 and b.shape_id = 271
and sdo_filter(a.GEOLOC,b.GEOLOC,'querytype=window')='TRUE' ;
Hope this helps,
Dan
Also, if only one or very few rows have a.info_id=2 then the function sdo_geom.relate
might also work quickly.

Slow GUI response time on 680

I just bought a new unlocked 680 to replace my old 650. I followed all the instructions to update Palm Desktop and sync'd my old data onto the new device. My first impressions are that the phone is good. However, I have noticed that the response time can be slow. For example, when using the navigation keypad in the main Apps screen it will get stuck for a second or so and then catch up. Also, the response in the Contacts can be noticeably slow.
Is this "normal" or is there something wrong that needs fixing?
Thanks,
-Computerguy
Post relates to:

sluggishness of the device can be attributed to the number of files and applications on it.
how slow is the response you mentioned? can you please state the time before an application opened?
if it's going to take more than 10 secs then that could an issue with your apps and data.
try soft reset and verify response again.
if it's still the same, there is a need for you to do a hard reset.
once your done with the hard reset, try your tapping the onboard apps and observe the response before doing any hotsync. try to see if it's still behaving the same.
if it is still showing the same behavior. your device is defective so you have to send back for replacement from the store.
if the device functions ok after the hard reset, you need to rename the backup folder in the username folder before doing any hotsync.
this way, you are taking away 3rd party apps when doing the hotsync. then observe the device.
if you have 3rd party apps that you need, you can install it again 1 by 1. if it's just PRC and PDB files, you can just go back to the renamed backup folder and drag them to the install tool then hotsync.
it those are exe files, you really need to reinstall it again and then sync.

Harmony One Slow Key Response Time

I've posted about this in the Logitech forums, but haven't had much success. I use my Harmony One to control my Apple TV 2, however the response time of the Apple TV after pressing a key on the remote is slow. It seems to take about 1 second between button presses for the Apple TV to respond. This makes it almost unusable as entering a movie name into a search field, etc. takes substantially longer than when I was using the original Apple TV remote.
I've tried changing the inter-key delay from 500 MS to 100 MS and then 0 MS but this doesn't seem to fix the problem. I've seen multiple posts on various forums about this issue but I've yet to find a repair. I know that many people use Harmony One remotes to control their Apple TV's so I'm hoping someone out there has figured out this annoying issue!

My Harmony One also works perfectly well with the ATV2.
What type of device have you defined the AppleTV in the, oh so wonderful Logitech software?
I previously had mine defined as a Mac Mini (when I used Front Row on my TV). All I did when I changed over to the ATV2 was rename it to AppleTV in activities. Under the hood in the Logitech software it's still defined as a Mac Mini.

Query response time

Needed some help to understand what may be the reason :
I have a query that appears to have different numbers even though the execution paths across two different database servers are same. Both servers have all the tables, indexes, data ,etc exactly the same.
And my query is
select DISTINCT a.PART , a.PART_DESC from PARTS a, MIKE.PART_RATE b where a.state = 'GA' and (a.source='R')
and (a.state = b.state and a.part = b.part and b.business = 'Y')
ON DATABASE 1
Execution Plan
0 SELECT STATEMENT Optimizer=HINT: FIRST_ROWS (Cost=1788 Card=630 Bytes=39060)
1 0 SORT (UNIQUE) (Cost=1788 Card=630 Bytes=39060)
2 1 NESTED LOOPS (Cost=1779 Card=630 Bytes=39060)
3 2 TABLE ACCESS (FULL) OF 'PART_RATE' (Cost=3 Card=592 Bytes=6512)
4 2 TABLE ACCESS (BY INDEX ROWID) OF 'PARTS' (Cost=3 Card=13840 Bytes=705840)
5 4 INDEX (RANGE SCAN) OF 'PARTS_X1' (NON-UNIQUE) (Cost=2 Card=13840)
ON DATABASE 2
Execution Plan
0 SELECT STATEMENT Optimizer=HINT: FIRST_ROWS (Cost=6 Card=1 Bytes=198)
1 0 SORT (UNIQUE) (Cost=6 Card=1 Bytes=198)
2 1 NESTED LOOPS (Cost=4 Card=1 Bytes=198)
3 2 TABLE ACCESS (FULL) OF 'PART_RATE' (Cost=2 Card=1 Bytes=9)
4 2 TABLE ACCESS (BY INDEX ROWID) OF 'PARTS' (Cost=2 Card=48 Bytes=9072)
5 4 INDEX (RANGE SCAN) OF 'PARTS_X1' (NON-UNIQUE) (Cost=1 Card=48)
The same query on DATABASE1 is taking much longer time. What might be the reason ? Your help is appreciated

If your tables are not analyzed and you provide a hint like FIRST_ROWS, Oracle will use the CBO to determine the query plan. If the tables have not been analyzed, the CBO will make up statistics, either using default values or doing dynamic sampling (depending on the version of Oracle and the initialization parameters). If Oracle has to do dynamic sampling, it may take significantly more time to parse the query and the query plan may be significantly slower. I would be a bit suprised if the query plan on both systems was really identical, which is why I was asking you how you found the query plan.
If you trace both sessions and run tkprof, you should see the breakdown in parse and execution time on both systems to see whether the slower system is spending the time parsing.
As I suggested originally, however, if you gather statistics on one system, you really ought to gather statistics on the other.
Justin
Distributed Database Consulting, Inc.
http://www.ddbcinc.com/askDDBC

How to improve sql server query response time

I have a table that contains 60 million records with the following structure
1. SEQ_ID (Bigint),
2. SRM_CLIENT_ENTITIES_SEQ_ID (Bigint),
3. CUS_ENTITY_DATA_SEQ_ID (Bigint),
4. SRM_CLIENT_ENTITY_ATTRIBUTES_SEQ_ID (Bigint),
5. ATTRIBUTE_DATETIME (DateTime),
6. ATTRIBUTE_DECIMAL (Decimal(18,2)),
7. ATTRIBUTE_STRING (nvarchar(255)),
8. ATTRIBUTE_BOOLEAN (Char(1)),
9. SRM_CLIENTS_SEQ_ID (Bigint)
Clustered index with key SEQ_ID
Non unique non clustered index : I've following four composite indexes
a. SRM_CLIENTS_SEQ_ID, SRM_CLIENT_ENTITIES_SEQ_ID, SRM_CLIENT_ENTITY_ATTRIBTUES_SEQ_ID, ATTRIBUTE_DATETIME
b. SRM_CLIENTS_SEQ_ID, SRM_CLIENT_ENTITIES_SEQ_ID, SRM_CLIENT_ENTITY_ATTRIBTUES_SEQ_ID, ATTRIBUTE_DECIMAL
c. SRM_CLIENTS_SEQ_ID, SRM_CLIENT_ENTITIES_SEQ_ID, SRM_CLIENT_ENTITY_ATTRIBTUES_SEQ_ID, ATTRIBUTE_STRING
d. SRM_CLIENTS_SEQ_ID, SRM_CLIENT_ENTITIES_SEQ_ID, SRM_CLIENT_ENTITY_ATTRIBTUES_SEQ_ID, ATTRIBUTE_BOOLEAN
The problem is that when i execute a simple query over this table it does not return the results in an acceptable time.
Query:
SELECT CUS_ENTITY_DATA_SEQ_ID FROM dbo.CUS_PIVOT_NON_UNIQUE_INDEXES WHERE SRM_CLIENT_ENTITY_ATTRIBUTES_SEQ_ID = 51986 AND ATTRIBUTE_DECIMAL = 4150196
Execution Time : 2 seconds
Thanks

Did you look at the execution plan.
The query may not use none of the indexes. The Clustered index is on SEQ_ID and the non clustered index doesn't start with SRM_CLIENT_ENTITY_ATTRIBUTES_SEQ_ID
OR ATTRIBUTE_DECIMAL.
The order of the columns in an index matters. Just for testing ( if it is not prod. environment) Create an NCI with SRM_CLIENT_ENTITY_ATTRIBUTES_SEQ_ID
and ATTRIBUTE_DECIMAL and check.
Please use Marked as Answer if my post solved your problem and use
Vote As Helpful if a post was useful.

Query response time takes more time when calling from package

SELECT
/* UTILITIES_PKG.GET_COUNTRY_CODE(E.EMP_ID,E.EMP_NO) COUNTRY_ID */
(SELECT DISTINCT IE.COUNTRY_ID
FROM DOCUMENT IE
WHERE IE.EMP_ID =E.EMP_ID
AND IE.EMP_NO = E.EMP_NO
AND IE.STATUS = 'OPEN' ) COUNTRY_ID
FROM EMPLOYEE E
CREATE OR REPLACE PACKAGE BODY UTILITIES_PKG AS
FUNCTION GET_COUNTRY_CODE(P_EMP_ID IN VARCHAR2, P_EMP_NO IN VARCHAR2)
RETURN VARCHAR2 IS
L_COUNTRY_ID VARCHAR2(25) := '';
BEGIN
SELECT DISTINCT IE.COUNTRY_ID
INTO L_COUNTRY_ID
FROM DOCUMENT IE
WHERE IE.EMP_ID = P_EMP_ID
AND IE.EMP_NO = P_EMP_NO
AND IE.STATUS = 'OPEN';
RETURN L_COUNTRY_ID;
EXCEPTION
WHEN OTHERS THEN
RETURN 'CONT';
END;
END UTILITIES_PKG;
when I run above query its coming in 1.2 seconds.but when comment subquery and call from package its taking 9 seconds.query returns more than 2000 records.i am not able to find the reason why it is taking more time when calling from package?

You are getting a different plan when you run it as PL/SQL most likely. Comment your statement:
SELECT /* your comment here */then find them in V$SQL and get the SQL IDs. You can then use DBMS_XPLAN.DISPLAY_CURSOR to see what is actually happening.
http://www.psoug.org/reference/dbms_xplan.html

Slow query response time

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