Slow in Fetching Query Results

Hi guys, we have been experiencing a serious performance problem with our Oracle database application. The appplication is a C++ app running on a Windows box, queries an Oracle 9.2 database running on another Windows box, through Oracle 9.2 ODBC driver. What we experienced is that the fetch of query results takes significant length of time - around 1.7 seconds for fetching 3000 result rows on a 2.4Ghz dual processor box, whereas the same app/query takes only 50 milliseconds for fetching the same number of result rows. Do you guys have any idea where I should go to track down the problem? The Oracle database configuration? The ODBC driver? Or our C++ database access code?

Yes, all tables involved in the query have 2 to 3 indexes.
I have re-computed statistics on the tables and changed the optimizer_mode to ALL_ROWS. In the following I am attaching the init parameters of my database and the new execution plan
=========================================================
aq_tm_processes = 1
background_dump_dest = C:\oracle\admin\MBTuning\bdump
compatible = 9.2.0.0.0
control_files = ('C:\oracle\oradata\MBTuning\CONTROL01.CTL', 'C:\oracle\oradata\MBTuning\CONTROL02.CTL', 'C:\oracle\oradata\MBTuning\CONTROL03.CTL')
core_dump_dest = C:\oracle\admin\MBTuning\cdump
db_block_size = 8192
db_cache_size = 134217728
db_domain = ''
db_file_multiblock_read_count = 16
db_name = MBTuning
dispatchers = '(PROTOCOL=TCP) (SERVICE=MBTuningXDB)'
fast_start_mttr_target = 300
hash_join_enabled = TRUE
instance_name = MBTuning
java_pool_size = 33554432
job_queue_processes = 10
large_pool_size = 67108864
log_archive_dest_1 = 'LOCATION=C:\oracle\ora92\RDBMS'
open_cursors = 300
optimizer_features_enable = 9.2.0
optimizer_index_caching = 100
optimizer_mode = ALL_ROWS
pga_aggregate_target = 134217728
processes = 150
query_rewrite_enabled = FALSE
remote_login_passwordfile = EXCLUSIVE
sga_max_size = 403774644
shared_pool_size = 67108864
sort_area_size = 524288
star_transformation_enabled = FALSE
timed_statistics = TRUE
undo_management = AUTO
undo_retention = 10800
undo_tablespace = UNDOTBS1
user_dump_dest = C:\oracle\admin\MBTuning\udump
=========================================================
STAT #1 id=1 cnt=2815 pid=0 pos=1 obj=0 op='SORT ORDER BY '
STAT #1 id=2 cnt=2815 pid=1 pos=1 obj=0 op='NESTED LOOPS OUTER '
STAT #1 id=3 cnt=2815 pid=2 pos=1 obj=0 op='VIEW '
STAT #1 id=4 cnt=2815 pid=3 pos=1 obj=0 op='NESTED LOOPS OUTER '
STAT #1 id=5 cnt=100 pid=4 pos=1 obj=0 op='NESTED LOOPS '
STAT #1 id=6 cnt=100 pid=5 pos=1 obj=0 op='NESTED LOOPS '
=====================
PARSING IN CURSOR #2 len=116 dep=1 uid=0 oct=3 lid=0 tim=18446744070694916859 hv=189272129 ad='146e1308'
select o.owner#,o.name,o.namespace,o.remoteowner,o.linkname,o.subname,o.dataobj#,o.flags from obj$ o where o.obj#=:1
END OF STMT
PARSE #2:c=0,e=460,p=0,cr=0,cu=0,mis=1,r=0,dep=1,og=0,tim=18446744070694916853
BINDS #2:
bind 0: dty=2 mxl=22(22) mal=00 scl=00 pre=00 oacflg=08 oacfl2=1 size=24 offset=0
bfp=053b8ac8 bln=22 avl=04 flg=05
value=30312
EXEC #2:c=0,e=261,p=0,cr=0,cu=0,mis=0,r=0,dep=1,og=4,tim=18446744070694917254
FETCH #2:c=0,e=27,p=0,cr=3,cu=0,mis=0,r=1,dep=1,og=4,tim=18446744070694917315
STAT #1 id=7 cnt=100 pid=6 pos=1 obj=30312 op='TABLE ACCESS BY INDEX ROWID ASSETREFS '
STAT #1 id=8 cnt=101 pid=7 pos=1 obj=30382 op='INDEX RANGE SCAN ASSETREF_PARENTID '
BINDS #2:
bind 0: dty=2 mxl=22(22) mal=00 scl=00 pre=00 oacflg=08 oacfl2=1 size=24 offset=0
bfp=053b8ac8 bln=22 avl=04 flg=05
value=30307
EXEC #2:c=0,e=63,p=0,cr=0,cu=0,mis=0,r=0,dep=1,og=4,tim=18446744070694917526
FETCH #2:c=0,e=13,p=0,cr=3,cu=0,mis=0,r=1,dep=1,og=4,tim=18446744070694917564
STAT #1 id=9 cnt=100 pid=6 pos=2 obj=30307 op='TABLE ACCESS BY INDEX ROWID ASSETS '
STAT #1 id=10 cnt=100 pid=9 pos=1 obj=30405 op='INDEX UNIQUE SCAN PK_ASSETS '
BINDS #2:
bind 0: dty=2 mxl=22(22) mal=00 scl=00 pre=00 oacflg=08 oacfl2=1 size=24 offset=0
bfp=053b8ac8 bln=22 avl=04 flg=05
value=30313
EXEC #2:c=0,e=58,p=0,cr=0,cu=0,mis=0,r=0,dep=1,og=4,tim=18446744070694917738
FETCH #2:c=0,e=11,p=0,cr=3,cu=0,mis=0,r=1,dep=1,og=4,tim=18446744070694917773
STAT #1 id=11 cnt=100 pid=5 pos=2 obj=30313 op='TABLE ACCESS BY INDEX ROWID REVISIONS '
STAT #1 id=12 cnt=100 pid=11 pos=1 obj=30502 op='INDEX RANGE SCAN REVISIONBASE '
STAT #1 id=13 cnt=2815 pid=4 pos=2 obj=30410 op='INDEX RANGE SCAN PK_METADATA '
BINDS #2:
bind 0: dty=2 mxl=22(22) mal=00 scl=00 pre=00 oacflg=08 oacfl2=1 size=24 offset=0
bfp=053b8ac8 bln=22 avl=04 flg=05
value=30315
EXEC #2:c=0,e=58,p=0,cr=0,cu=0,mis=0,r=0,dep=1,og=4,tim=18446744070694917965
FETCH #2:c=0,e=12,p=0,cr=3,cu=0,mis=0,r=1,dep=1,og=4,tim=18446744070694918001
STAT #1 id=14 cnt=0 pid=2 pos=2 obj=30315 op='TABLE ACCESS BY INDEX ROWID METADATA '
STAT #1 id=15 cnt=0 pid=14 pos=1 obj=30410 op='INDEX UNIQUE SCAN PK_METADATA '

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Thanks!

Hi Zilla Eh ,
Thanks for the reply.
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Hi Experts,
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Hi man,
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Edited by: Frank Lee on Jul 14, 2009 2:22 PM

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Hi,
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Edited by: gggraham on Oct 27, 2011 4:54 PM

Large query result set

Hi all,
At the moment we have some java classes (not ejb - cmp/bmp) for search in
our ejb application.
Now we have a problem i.e. records have grown too high( millions ) and
sometimes query results in retrieval of millions of records. It results in
too much memory consumtion in our ejb application. What is the best way to
address this issue.
Any help will be highly appreciated.
Thanks & regards,
Parvez

you can think of following options
1) paging: read only few thousands at a time and maintain a index to page
through complete dataset
2) caching!
a) you can create a serialized data file in server to cache the result set
and can use that to browse through. you may do on the fly
compression/uncompression while sending data to client.
b) applet based solution where caching could be in client side. Look in
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thanks,
Srinivas
"chauhan" <[email protected]> wrote in message
news:[email protected]...
Thanks Slava Imeshev,
We already have search criteria and a limit. When records exceeds thatlimit
then we prompt user that it may take sometime, do you want to proceed? If
he clicks yes then we retrieve those records. This results in lot ofmemory
consumtion.
I was thinking if there is some way that from database I can retrieve some
block of records at a time rather the all records of a query. I wander how
internet search sites work, where thousnds of sites/pages match criteriaand
client can move back & front on any page.
Regards,
Parvez
"Slava Imeshev" <[email protected]> wrote in message
news:[email protected]...
Hi chauhan,
You may want to narrow search criteria along with processing a
limited number of resulting records. I.e. if the size of the result
is bigger than a limit, you stop fetching results and notify the client
that search criteria should be narrowed.
HTH.
Regards,
Slava Imeshev
"chauhan" <[email protected]> wrote in message
news:[email protected]...
Hi all,
At the moment we have some java classes (not ejb - cmp/bmp) for
search
in
our ejb application.
Now we have a problem i.e. records have grown too high( millions ) and
sometimes query results in retrieval of millions of records. It
results
in
too much memory consumtion in our ejb application. What is the best
way
to
address this issue.
Any help will be highly appreciated.
Thanks & regards,
Parvez

SSRS 2008 R2 is extremely slow. The query runs in less than a second in the dataset designer but if you try to view the report it takes over 10 minutes. I have read this is a bug in SSRS 2008 R2. We installed the most recent patches and service packs.

SSRS 2008 R2 is extremely slow. The query runs in less than a second in the dataset designer but if you try to view the report it takes over 10 minutes. I have read this is a bug in SSRS 2008 R2. We installed the most recent patches and
service packs. Nothing we've done so far has fixed it and I see that I'm not the only person with this problem. However I don't see any answers either.

Hi Kim Sharp,
According to your description that when you view the report it is extremely slow in SSRS 2008 R2 but it is very fast when execute the query in dataset designer, right?
I have tested on my local environment and can‘t reproduce the issue. Obviously, it is the performance issue, rendering performance can be affected by a combination of factors that include hardware, number of concurrent users accessing reports, the amount
of data in a report, design of the report, and output format. If you have parameters in your report which contains many values in the list, the bad performance as you mentioned is an known issue on 2008 R2 and already have the hotfix:
http://support.microsoft.com/kb/2276203
Any issue after applying the update, I recommend you that submit a feedback at https://connect.microsoft.com/SQLServer/
If you don’t have, you can do some action to improve the performance when designing the report. Because how you create and update reports affects how fast the report renders.
Actually, the Report Server ExecutionLog2 view contains reports performance data. You could make use of below query to see where the report processing time is being spent:
After you determine whether the delay time is in data retrieval, report processing, or report rendering:
use ReportServer
SELECT TOP 10 ReportPath,parameters,
TimeDataRetrieval + TimeProcessing + TimeRendering as [total time],
TimeDataRetrieval, TimeProcessing, TimeRendering,
ByteCount, [RowCount],Source, AdditionalInfo
FROM ExecutionLog2
ORDER BY Timestart DESC
Use below methods to help troubleshoot issues according to the above query result :
Troubleshooting Reports: Report Performance
Besides this, you could also follow these articles for more information about this issue:
Report Server Catalog Best Practices
Performance, Snapshots, Caching (Reporting Services)
Similar thread for your reference:
SSRS slow
Any problem, please feel free to ask
Regards
Vicky Liu

How can I architect my data layer to yield query result pages to the application as SQL Server prepares them?

I tried to make the question as explicit as possible.
Refer to Sql Server Management Studio's Results view. Depending upon the structure of the execution plan, the Results pane may begin displaying results while the query is still executing. Can someone point me in a direction for architecting a
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The call from the data layer to SQL Server will obviously have to be asynchronous, but is there any additional ceremony that I need to be aware of when issuing OPTION (FAST x) to the query optimizer?

Thanks for the reply. (I actually meant to put this in the SQL Data Access forum, not the T-SQL forum)
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For purposes of discussion, let's assume that the query is
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Be that as it may, if there is any ceremony that SQL Server imposes on clients in order to yield return, I would expect that my question would be in the scope of SQL Server discussions (even though I intended this to be in a different SQL Server forum)

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theFurryOne

Raghu,
I am happy with both.
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theFurryOne

How to use SQL query result in DOS commands

Hi
Currently i am runnig below DOS commands manually
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Now I want to write one batch file and schedule job on windows and make value of "period" to be dynamic. So to get that value i need to fetch it from DB
Steps which i am taking are
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Edited by: sachin.mali on Oct 26, 2010 4:39 PM
Edited by: sachin.mali on Oct 26, 2010 4:43 PM

sachin.mali wrote:
Hi
Currently i am runnig below DOS commands manually
d:\apps\bin>TrueGridsCalc period="Aug 2010"
Now I want to write one batch file and schedule job on windows and make value of "period" to be dynamic. So to get that value i need to fetch it from DB
Steps which i am taking are
1. connect DB from command line (using SQLPLUS)
2. run query to fetch result
3.How to use query result in "period" parameter ?
I am good at step 1 and 2. Dnt know how to use query result in command to make it dynamic
Thank you
Sachin
Edited by: sachin.mali on Oct 26, 2010 4:39 PM
Edited by: sachin.mali on Oct 26, 2010 4:43 PMYOu'll have to have sqlplus spool the output to a file, then figure out some way of parsing that file. Too bad you're stuck with Windows. With any *nix you could do the file parsing with one line of code.

EJB Issue with return empty children in join fetch query

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I have a recursive table which has a 0,1-n relationship with itself. In this case, I want to query for all objects and fetch the resulting children.
To do this I have written the following query:
select o from Node o inner join fetch o.childrenNodeList order by o.nodeorder
If my database has the following entries:
Parent
Child
Grandchild
The above query will get all 3 and allow me to access the list of children through getChildrenNodeList, however, for Grandchild this returns "An attempt was made to traverse a relationship using indirection that had a null Session...." for Parent and Child however it works like it should and gets the fetched rows.
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Kris

fixed

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Hi
We are trying to execute a BW query using the RRW3_GET_QUERY_VIEW_DATA function module but when I test the function module I'm getting the data expected.
My query is a simple query returning the cost center hierarchy that my authorizations give me access to). I fill the import parameters I_INFOPROVIDER and I_QUERY and leave I_VIEW_ID and I_T_PARAMETER empty. When I execute the function module I only get zeros in the E_CELL_DATA export parameter. The query works fine, when I execute it through the Query Analyzer.
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Regards,
Jacob Vennervald

OK, I have found out that the reason I didn't get any data was that I didn't have any key figures in the query. This might sound strange but I'll try to explain.
What I want to do is to create a query that will return the cost center hierarchy that a specific user has access to. This hierarchy is in the infoobject 0COSTCENTER and I though I could just make a query with this infoobject in it and then fetch the result of this query in ABAP using FM RRW3_GET_QUERY_VIEW_DATA, but apparently that is not possible.
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Regards,
Jacob

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Need help
Thanks in advance
karman

If you meant a situation like: Page 1 has some items and page 2 has a report which refers page 1 itemsThen your report _query would fetch proper results provided the page 1 item values are available in the session_.
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Thanks!

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heres my code example but it isnt work:
<?php
if ($conn=OCILogon($HTTP_POST_VARS['user'], $HTTP_POST_VARS['pass'], $HTTP_POST_VARS['dienst'])) {
echo "Successfully connected to Oracle.\n";
OCILogoff($c);
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Message was edited by:
LOD
Message was edited by:
LOD

There's a basic error in your sample code. You query for table_name from user_tables, which basically just lists the tables that exist in your schema. Since you're using 'id' further on, I suspect your query would look something like 'select id from users'.
     while (OCIFetch($stmt))
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}This won't work for 2 major reasons.
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while (ocifetchinto($stmt, $record))
print $record['ID'];
}2. You've put the <select></select> code in your loop. I assume that you only want to loop options, so the <select></select> should be moved to outside the loop.

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