Question about queries

I am using several ways to build queries :
mySession.readObject
mySession.readAllObjects
mySession.executeQuery
and classes ReadObjectQuery, readAllQuery and readQuery
What are the differences between all this classes and methods ???
I also used queries "after load". How can i configure the
cache to optimize these queries without using the workbench ??
Is it recommended to use queries "after load" ??
How can i optimize queries (for the cache) ?
Thanks

The session.readObject and session.readAllObjects are simply helper methods that actually instantiate the appropriate query object (ReadObjectQuery or ReadAllQuery) and execute them using session.executeQuery. They all end up doing the same thing. Using the query objects will give you far more flexibility to tune the query's execution for performance and cache usage.
I would recommend using the after-load approach to configuring all static parameratized queries and registering them by name with the descriptor's query manager. You can then execute them in the application using sessions.executeQuery("query name", MyClass.class, ...). This will allow you to isolate the queries so they can be more easily managed and tuned.
Doug

Similar Messages

Question about queries's type

HI All
Can someone please tell me what is
relational and multidimensional queries ?
Thanks in Advanced
Naama

relational query & (multi)dimensional query relates only to DWH ?No, you can use 'DWH'-stuff in OLTP and 'OLTP'-stuff in a DWH.
For example: the MODEL-clause is designed for DWH, but you can find many examples using it on this forum.
i don't really know what is OLTP , i'm working on oracle but not in DWH.Then there's a big chance you're working on an OLTP system.
They're the 'normal systems'.
The main difference between OLTP and DWH/OLAP is SIZE.
These explanations are about the differences between them:
http://asktom.oracle.com/pls/apex/f?p=100:11:0::::P11_QUESTION_ID:30801968442845 (where you can read ODS as OLTP)
http://asktom.oracle.com/pls/apex/f?p=100:11:0::::P11_QUESTION_ID:5560484386129
http://asktom.oracle.com/pls/apex/f?p=100:11:0::::P11_QUESTION_ID:35669487404783

Quick question about Queries

I am just using the APEX online and I've requested a workspace. I have also sucessfully inserted a table now I am working with queries and I want to make a column condition "greater than 50" under a specific column. I've tried >50 and >=50 and both of them don't pull up anything even though I know I have rows that are greater than 50 under one of the columns, do I have the symbol wrong?
thanks

Its weird, when I type under "column conditions" something like 50 in the query page, it gives me all the rows that contain 50, but its when i'm looking for greater than 50 the results do now show. I already tried under the column name >50 and >=50 but no results are detected but i know there are rows with 50 or greater.

A question about objects and queries

I just started using COM objects in ColdFusion. I am mostly
using CreateObject, but occasionaly use <CFOBJECT>
My question is; Do I have to destroy these object variables
when I am done? I know in a lot of other languages I work in, you
have to "clean up'" after yourself and destroy some variables when
you are done to avoid memory leaks. How does CF handle this?
While I am asking, what about queries? Do hey have to be
destroyed as well? What about queries made with QueryNew?
Thank you for the help.

Cold fusion cleans up for you.
You do not need to explicitly destroy anything unless threads
are spawned in a non standard way by Java or C code that you are
using.

A question about the impact of SQL*PLUS SERVEROUTPUT option on v$sql

Hello everybody,
SQL> SELECT * FROM v$version;
BANNER
Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - 64bit Production
PL/SQL Release 11.2.0.1.0 - Production
CORE    11.2.0.1.0 Production
TNS for Linux: Version 11.2.0.1.0 - Production
NLSRTL Version 11.2.0.1.0 - Production
SQL>
OS : Fedora Core 17 (X86_64) Kernel 3.6.6-1.fc17.x86_64I would like to ask a question about the SQL*Plus SET SERVEROUTPUT ON/OFF option and its impact on queries on views such as v$sql and v$session. Here is the problem
Actually I define three variables in SQL*Plus in order to store sid, serial# and prev_sql_id columns from v$session in order to be able to use them later, several times in different other queries, while I'm still working in the current session.
So, here is how I proceed
SET SERVEROUTPUT ON; -- I often activate this option as the first line of almost all of my SQL-PL/SQL script files
SET SQLBLANKLINES ON;
VARIABLE mysid NUMBER
VARIABLE myserial# NUMBER;
VARIABLE saved_sql_id VARCHAR2(13);
-- So first I store sid and serial# for the current session
BEGIN
    SELECT sid, serial# INTO :mysid, :myserial#
    FROM v$session
    WHERE audsid = SYS_CONTEXT('UserEnv', 'SessionId');
END;
PL/SQL procedure successfully completed.
-- Just check to see the result
SQL> SELECT :mysid, :myserial# FROM DUAL;
    :MYSID :MYSERIAL#
       129   1067
SQL> Now, let's say that I want to run the following query as the last SQL statement run within my current session
SELECT * FROM employees WHERE salary >= 2800 AND ROWNUM <= 10;According to Oracle® Database Reference 11g Release 2 (11.2) description for v$session
http://docs.oracle.com/cd/E11882_01/server.112/e25513/dynviews_3016.htm#REFRN30223]
the column prev_sql_id includes the sql_id of the last sql statement executed for the given sid and serial# which in the case of my example, it will be the above mentioned SELECT query on the employees table. As a result, right after the SELECT statement on the employees table I run the following
BEGIN
    SELECT prev_sql_id INTO :saved_sql_id
    FROM v$session
    WHERE sid = :mysid AND serial# = :myserial#;
END;
PL/SQL procedure successfully completed.
SQL> SELECT :saved_sql_id FROM DUAL;
:SAVED_SQL_ID
9babjv8yq8ru3
SQL> Having the value of sql_id, I'm supposed to find all information about cursor(s) for my SELECT statement and also its sql_text value in v$sql. Yet here is what I get when I query v$sql upon the stored sql_id
SELECT child_number, sql_id, sql_text
FROM v$sql
WHERE sql_id = :saved_sql_id;
CHILD_NUMBER   SQL_ID          SQL_TEXT
0              9babjv8yq8ru3    BEGIN DBMS_OUTPUT.GET_LINES(:LINES, :NUMLINES); END;Therefore instead of
SELECT * FROM employees WHERE salary >= 2800 AND ROWNUM <= 10;for the value of sql_text I get the following value
BEGIN DBMS_OUTPUT.GET_LINES(:LINES, :NUMLINES);Which is not of course what I was expecting to find in v$sql for the given sql_id.
After a bit googling I found the following thread on the OTN forum where it had been suggested (well I think maybe not exactly for the same problem) to turn off SERVEROUTPUT.
Problem with dbms_xplan.display_cursor
This was precisely what I did
SET SERVEROUTPUT OFFafter that I repeated the whole procedure and this time everything worked pretty well as expected. I checked SQL*Plus documentation for SERVEROUTPUT
and also v$session page, yet I didn't find anything indicating that SERVEROUTPUT should be switched off whenever views such as v$sql, v$session
are queired. I don't really understand the link in terms of impact that one can have on the other or better to say rather, why there is an impact
Could anyone kindly make some clarification?
thanks in advance,
Regards,
Dariyoosh

>
and also v$session page, yet I didn't find anything indicating that SERVEROUTPUT should be switched off whenever views such as v$sql, v$session
are queired. I don't really understand the link in terms of impact that one can have on the other or better to say rather, why there is an impact
Hi Dariyoosh,
SET SERVEROUTPUT ON has the effect of executing dbms_output.get_lines after each and every statement. Not only related to system view.
Here below what Tom Kyte is explaining in this page:
Now, sqlplus sees this functionality and says "hey, would not it be nice for me to dump this buffer to screen for the user?". So, they added the SQLPlus command "set serveroutput on" which does two things
1) it tells SQLPLUS you would like it <b>to execute dbms_output.get_lines after each and every statement</b>. You would like it to do this network rounding after each call. You would like this extra overhead to take place (think of an install script with hundreds/thousands of statements to be executed -- perhaps, just perhaps you don't want this extra call after every call)
2) SQLPLUS automatically calls the dbms_output API "enable" to turn on the buffering that happens in the package.Regards.
Al

Question about autodiscover in case of multiple bound namespace

Hi Experts,
I have a question about the autodiscover behaviour. Let's assume we have the below infrastructure:
SiteA :
MBX-Server-SiteA : Member of a DAG
CAS-Server-SiteA : outlook anywhere url = siteA.domain.com
SiteB :
MBX-Server-SiteB : Member of a DAG
CAS-Server-SiteB-1 : outlook anywhere url = siteB-1.domain.com
CAS-Server-SiteB-2: outlook anywhere url = siteB-2.domain.com
We have DB-1 and DB-2 that have copies in both MBX servers.
My question is how does exchange select the access URLs to return in the autodiscover process? I know that it depends on where the mailbox is hosted but can't find details about the process in the technet articles.
Thanks.

There's quite a few details that are involved in the Autodiscover process. First of all - probably the most important thing is that there are 2 stages to the whole process.
In the first stage, the client is simply concerned with getting the address of a CAS server that will help it further. We'll keep things simple and assume your scenario where the client is located inside the network and is domain-joined. The details of the
LDAP query are detailed in
this link. (At the time I was investigating this I've actually went ahead and ran the queries using the ldp.exe client against the Configuration partition of the respective AD domain - it's worth seeing the actual responses.) An interesting trick here is
the 'keywords' attribute that's stamped on those SCP entries. The reason behind it is that you don't want a client located in a site to go half across the globe in order to connect to a CAS server, when there's one available in its own site. One simple way
to get the 'keywords' attribute stamped is through the Set-ClientAccessServer cmdlet, using the -AutodiscoverSiteScope parameter. In your example, you'd probably want to run it against the CAS server in Site A and specify the name of the corresponding AD site
('SiteA') and correspondingly against the 2 CAS servers in Site B (using 'SiteB'). Once the client has got the response to his query, it will attempt to select one server that's handling the site he's in (essentially it will filter the results based on 'keywords'
-contains <client-site>). Now that we got our endpoint we can go to stage 2.
In stage 2, the client will actually use EWS in order to query the Autodiscover service itself running on our target server. There are 2 possible interfaces of accessing the Autodiscover service: POX (Plain Old XML) and SOAP. POX will be targeting the ../Autodiscover.xml
URLS, while the SOAP one will be using ../Autodiscover.svc URLs. Details about this including some hardcoded parts are
here. What happens next is detailed in point 3, section 2.1 The Autodiscover Process
here. This last link is the key to the whole process:
"It provides a list of CAS that has AutodiscoverSiteScope information set for the
Associated AD site of the Database where the client Mailbox is located."
In other words, the CAS is smart enough to return the URLs belonging to a CAS server in the AD site where the client's mailbox' database is active.
My advice is to test this on your scenario. Tests can be done here first-hand: the Outlook's tray icon Test E-Mail AutoConfiguration can be used or alternatively - if you want to see the details in the communication - SoapUI
for the SOAP access method, for POX there's an extension called 'Postman for Chrome' that can be used. I've used all these in my tests back when I was fighting conflicting results from the articles around the web about Autodiscover.
That's a long way of saying we get the AutoD URL of a CAS server closest to the workstation, which then provides the configuration to use which are the the URLs closest to the mailbox :)
By all means look at the SOAP response, but Outlook will only use POX. Lync does SOAP along with other 3rd party apps.
Cheers,
Rhoderick
Microsoft Senior Exchange PFE
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http://blogs.technet.com/rmilne
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Question about Picklists

Hi,
I have a question about picklists. We have a standard table that displays multiple records that can be updated. Originally, there were LOVs on each field in the table, but the customer requested we switch to picklists. Once we did this, performance became abysmal. With diagnostics mode turned on, I can see that the query for every picklist is running multiple times (once per each row present in the table).
Is there any way to stop these unnecessary queries? I tried using the setPickListCacheEnabled(true) method for OAMessageChoiceBean, but this did not resolve the issue.
Any thoughts? Or are we stuck with LOVs. Thanks!
John

setPickListCacheEnabled has really nothing to do with multple query runs. Any way, is the query getting executed multiple times only in the Diagnostics mode ?

Question about searching

Hi all,
I'm considering Oracle BDBJE for a project that stores visited url's (data) based on a key of ip-address (4 bytes) combined with a date (long) to make the keys unique.
If want to search on date (ignore ip) do I have to make a secondary database that has the date of the visited url's as primary index?
Does a method like Cursor.getSearchKeyRange, if supplied with partial key, always search a the beginning of the key? Or could I use it to search for a date by only supplying the date-part of the key? Prop. in this case the bytes for the date will be mistaken for the bytes of the ip-address that comes first in the key.
Thanks for any help.
regards,
Jeroen

Hi Jeroen,
I'm not sure I have all of your data model yet, but I think you've given us enough for me to say you should likely try one or possibly two secondary databases.
If you have not already done so you should review the documentation on Secondary Indexes as found here:
http://www.oracle.com/technology/documentation/berkeley-db/je/GettingStartedGuide/indexes.html
Inserting/Modifying records is faster without using a secondary index. But the queries that you have identified would perform better with secondary indexes. But you should experiment with a few different approaches and compare that with your performance goals.
Also, if you have not already thought about this, I would consider using DPL to implement this, especially since you will be evaluating alternative database designs. You will find that the implementation time is faster and you can also make changes quickly.
http://www.oracle.com/technology/documentation/berkeley-db/je/PersistenceAPI/BerkeleyDB-JE-Persistence-GSG.pdf
You know your data best, but based on the info you provided here are my thoughts/alternatives:
Primary Database key = IP/Date or Maybe Date/IP is better if the Secondary for IP address exists
data = URL plus other data not sure what
Secondary Database Key = URL (I left out date because you said it is not likely that the same URL will exist for multiple dates).
Possible Secondary Database Key = IP address (Which URL's were visited by IP X).
Again, I think you may want to try out something like this a model your inserts and also your query performance. Feel free to post further questions about any results you are getting as you move forward.
Also, if you have not already seen this I would keep this URL handy and consult with it before you post:
http://www.oracle.com/technology/products/berkeley-db/faq/je_faq.html
I hope this helps!
Ron

Miscellanous questions about BDB XML

Hi !
I'm in search for a storage solution for a Matlab app that manipulates big volumes of datas (several Gb), and so can't load them fully in memory without crashing. I also can't load / unload them each time I need a bit of these data, since it is rather long to load a file in memory (about 0.12s). So I was thinking about using a DMB like BDB XML, and I have a few questions about it :
<ul><li>What about performances to create a 3-5Gb database in a single batch ?</li>
<li>What about performances to excecute a XQuery request on a db this large ? Longer or shorter than loadin directly the file in memory ? With an index or without ?
</li>
<li> No matlab integration is provided, so I have to way : use Matlab C integration to make an interface to use BDB XML, or using the shell via an exec like command to interact with BDB ? Is the shell trick performant ? Or does it spend a lot of time parsing the input ?</li>
</ul>
Thanks for those who will take a bit of their precious time to answer my questions !

Hello,
I'm in search for a storage solution for a Matlab app that manipulates big volumes of datas (several Gb), and so can't load them fully in memory without crashing. I also can't load / unload them each time I need a bit of these data, since it is rather long to load a file in memory (about 0.12s). So I was thinking about using a DMB like BDB XML, and I have a few questions about it :
<ul><li>What about performances to create a 3-5Gb database in a single batch ?</li>It will take a while. If you bulk load you should avoid using transactions and sync/exit the environment when you are done. Note that you should determine what indexes you might want/need before doing the load and create them. Reindexing 5GB of data will take another really large chunk of time. I recommend experimentation with indexes, queries and a small representative subset of the data.
Be sure to create a node storage container with nodes indexed.
Is this one document or many? Many is better. One 5Gb document is less than ideal but will work.
<li>What about performances to excecute a XQuery request on a db this large ? Longer or shorter than loadin directly the file in memory ? With an index or without ?You really need indexes. The query will likely succeed without indexes but depending on the query and the data could take a very long time. See above on experimentation first.
</li>
<li> No matlab integration is provided, so I have to way : use Matlab C integration to make an interface to use BDB XML, or using the shell via an exec like command to interact with BDB ? Is the shell trick performant ? Or does it spend a lot of time parsing the input ?</li>There is no C interface, just C++. I would not recommend using the dbxml shell for this although you could if you really need to.
Let the group know how this turns out.
Regards,
George

Question about the function module (RFC_READ_TABLE)

Dear everyone
Could I ask you a question about the function module (RFC_READ_TABLE)?
I was asked if it's possible to create a report which compares the data between different SAP systems (both production systems).
Now, the easiest way would be to use the function module (RFC_READ_TABLE) within a SAP infoset query (SQ01 type query).
But I heard the rumor that using the function module (RFC_READ_TABLE) is not advisable due to the security reason.
However, I am not exactly sure what sort of security problems this function module can possibly have...
Would you help me on this?
I also would like to know if using "remote enabled module" type function module can always overcome this possible security issue.
Or, are there any points that I need to be careful about even when I use "remote enabled module" function module?
Thank you very much in advance.
Takashi

Dear Fred-san
Thank you very much for your support on this.
But, may I double check about what you mentioned above?
So, what you were mentioning was that if some user executes the query with
the function module (RFC_READ_TABLE), under the following conditions, he can access to
the HR data even when he does not have the authorizations for HR transactions?
<Conditions>
1. the user has the authorization for HR database tables themselves
2. RFC_READ_TABLE is called to retrieve the data from HR database
<example>
Data: LF_HR_TABLE like DD02L-TABNAME value 'PA0000'.
CALL FUNCTION 'RFC_READ_TABLE'
   EXPORTING
    query_table                = LF_HR_TABLE
TABLES
   OPTIONS                    =
   fields                     =
   data                       =    .
But then, as long as we call this function module for a non-critical tables such as
VBAP (sales order) or EKKO (purchase order) within our query, it wouldn't seem to be
so security risk to use RFC_READ_TABLE...
Besides, each query (infoset query) has got the concept of user groups, which limits
the access to the queries within the user group.
※If someone does not belong to the user group, he cannot execute the queries within that
   user group, etc
So, my feeling is that even infoset queries does have authorization concept...
Would you give me your thought on this?
I also thank you for your information for SCU0.
That is an interesting transaction
Kind regards,
Takashi

A question about Oracle 1g R2 Enterprise Edition license

Dear all,
I have a question about Oracle license and I would appreciate if you could kindly help me.
I have installed an Oracle server (11g R2 Enterprise edition) on a linux virtual machine. The pc used for this purpose
is my enterprise laptop (therefore a professional and not a personal Computer). However, I use the this Oracle Server
only for learning purpose, that is, only for running the examples in my Oracle Press books (SQL, PL/SQL and some
administration tasks) just for learning the stuff.
There is absolutely no data related to my enterprise, stored or used on this server. Whenever I want to work with my
enterprise data, I use the Oracle server of the enterprise which has of course the appropriate license. So as I said, I
use this Enterprise server on the virtual machine only for running queries/programs in my Oracle Press books just for
learning and I'm the sole person who uses this server (no remote connection for other users).
The reason for which I needed to install this server on my PC was that our DBA couldn't provide a training environment
for me with all required privileges and functionalities.
Am I supposed to buy a license for this installed Enterprise server on my virtual machine?
Thanks in advance,
Dariyoosh

drop.any wrote:
From OTN license agreement:
>
LICENSE RIGHTS
We grant you a nonexclusive, nontransferable limited license to use the programs only for the purpose of developing, testing, prototyping and demonstrating your application, and not for any other purpose. If you use the application you develop under this license for any internal data processing or for any commercial or production purposes, or you want to use the programs for any purpose other than as permitted under this agreement, you must obtain a production release version of the program by contacting us or an Oracle reseller to obtain the appropriate license. You acknowledge that we may not produce a production release version of the program and any development efforts undertaken by you are at your own risk. We may audit your use of the programs. Program documentation, if available, may accessed online at http://otn.oracle.com/docs.
Ownership and Restrictions We retain all ownership and intellectual property rights in the programs. The programs may be installed on one computer only, and used by one person in the operating environment identified by us. You may make one copy of the programs for backup purposes.
You may not:
- use the programs for your own internal data processing or for any commercial or production purposes, or use the programs for any purpose except the development of your application;
- use the application you develop with the programs for any internal data processing or commercial or production purposes without securing an appropriate license from us;
- continue to develop your application after you have used it for any internal data processing, commercial or production purpose without securing an appropriate license from us, or an Oracle reseller;
- remove or modify any program markings or any notice of our proprietary rights;
- make the programs available in any manner to any third party;
- use the programs to provide third party training;
- assign this agreement or give or transfer the programs or an interest in them to another individual or entity; - cause or permit reverse engineering (unless required by law for interoperability), disassembly or decompilation of the programs;
- disclose results of any program benchmark tests without our prior consent.
>Hello again,
Thank you both of you for your help. As it seems to me
>
We grant you a nonexclusive, nontransferable limited license to use the programs only for the purpose of developing, testing, prototyping and demonstrating your application, and not for any other purpose.
>
I think self training can be considered in this category, therefore I think there is no need to buy a license for that.
Kind regards,
Dariyoosh

A question about creating READ ONLY users.

Dear all,
I have a question about read only user accounts and I would appreciate if you could kindly give me a hand. I have a schema named SCHEMA1. Whenever I want to connect by using sqlplus I run the following:
sqlplus user1/[email protected] SCHEMA1.WORLD is the entry in the tnsnames.ora referring to the schema SCHEMA1.
I need to create a read only user who is able to SELECT all tables and views created by user1 on SCHEMA1 (this user will not modifiy anything at all. The user is used only for a person using SQL queries to read data). for several tables I write the grants explicitly, for example:
CREATE USER user2 IDENTIFIED BY user2;
GRANT CREATE SESSION to user2;
GRANT SELECT ON S001_COR_ECLASS TO user2;
GRANT SELECT ON REF_ECLASS511 TO user2;Is there anyway to do the same thing but for all the tables (because there are a lot of tables and views)? Besides, even with these granted permissions when the user connects with SQL Developer to the database, he is not able to view the list of tables/views in SQL Developer GUI. What causes this problem?
Thanks in advance,
Dariyoosh

Hello Dariyoosh,
he is not able to view the list of tables/views in SQL Developer GUIyou can either go to "Other Users" - user1 - tables. There you see every table you have permission to select.
Or you can create a synonym in schema2 for each table in schema1 and set a filter on the tables node of user2 "Include synonyms".
Regards
Marcus

Question about monthly plan

For the $9.99 plan is there a minimum monthly committment? Or is it pay by month and cancel anytime?

Hello and thank you for your answer. I do have one other question: with the createPDF subscription, can I create a pdf (from a Word document) that is text searchable and that recognizes the sequential numbering scheme in the pdf's page search field?
Thank you in advance for your answer to this query,
Zara
Date: Fri, 13 Sep 2013 03:21:36 -0700
From: [email protected]
To: [email protected]
Subject: Question about monthly plan
    Re: Question about monthly plan
    created by pranavj in Adobe CreatePDF - View the full discussion
Hi Zwat,
Thank you for your interest in ExportPDF subscription,
To answer your question, Their is no commitment required for createPDF subscription, You can pay it on monthly basis and cancel it anytime you want. There is no extra cost involved to it.
Let me know if you have any other queries.
Regards,
Pranav
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Questions about your new HP Products? HP Expert Day: January 14th, 2015

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On behalf of the Experts, I would like to thank you for coming to the Forum to connect with us. We hope you will return to the boards to share your experiences, both good and bad.
We will be holding more of these Expert Days on different topics in the months to come. We hope to see you then!
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We’ll also be covering the commercial products on the HP Enterprise Business Community. We’ll have experts online covering select boards on the Printing and Digital Imaging and Desktops and Workstations categories.
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Looking forward to seeing you on January 14th!
I am an HP employee.

My HP, purchased in June 2012, died on Saturday. I was working in recently installed Photoshop, walked away from my computer to answer the phone and when I came back the screen was blank. When I turned it on, I got a Windows Error Recovery message. The computer was locked and wouldn't let me move the arrow keys up or down and hitting f8 didn't do anything.
I'm not happy with HP. Any suggestions?

Have questions about your Creative Cloud or Subscription Membership?

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Question about queries

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