Dedicated database & cursor_sharing

I have Oracle db 11gr2 on aix wich is running in dedicated mode.
Based on a application documentation, I put cursor_sharing parameter to EXACT.
but, I wonder... could it there be any cursor sharing if a db is in dedicated mode?

PrafullaNath wrote:
Oracle says we should keep cursor_sharing=similar. Could you point out a documentation with this ?
EXACT is the default value:
http://download.oracle.com/docs/cd/E11882_01/server.112/e10820/initparams041.htm#REFRN10025
Using any other value than the default one requires strong application testing since it has been caused a lot of troubles by the past (wrong results were returned).
Nicolas.

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HTTP post data from the Oracle database to another web server

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user10264958 wrote:
My requirement is that I have blob table in another DB and our Oracle Forms application based on another DB has to view the documents . Viewing blobs over dblinks is not possible. Incorrect. You can use remote LOBs via a database link. However, you cannot use a local LOB variable (called a LOB <i>locator</i>) to reference a remote LOB. A LOB variable/locator is a pointer - that pointer cannot reference a LOB that resides on a remote server. So simply do not use a LOB variable locally as it cannot reference a remote LOB.
Instead provide a remote interface that can deal with that LOB remotely, dereference that pointer on the remote system, and pass the actual contents being pointed at, to the local database.
The following demonstrates the basic approach. How one designs and implements the actual remote interface, need to be decided taking existing requirements into consideration. I simply used a very basic wrapper function.
SQL> --// we create a database link to our own database as it is easier for demonstration purposes
SQL> create database link remote_db connect to scott identified by tiger using
2 '(DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=127.0.0.1)(PORT=1521))(CONNECT_DATA=(SID=dev)(SERVER=dedicated)))';
Database link created.
SQL> --// we create a table with a CLOB that we will access via this db link
SQL> create table xml_files( file_id number, xml_file clob );
Table created.
SQL> insert into xml_files values( 1, '<root><text>What do you want, universe?</text></root>' );
1 row created.
SQL> commit;
Commit complete.
SQL> --// a local select against the table works fine
SQL> select x.*, length(xml_file) as "SIZE" from xml_files x;
   FILE_ID XML_FILE                                                                                SIZE
         1 <root><text>What do you want, universe?</text></root>                                    53
SQL> --// a remote select against the table fails as we cannot use remote pointers/locators
SQL> select * from xml_files@remote_db x;
ERROR:
ORA-22992: cannot use LOB locators selected from remote tables
no rows selected
SQL> //-- we create an interface on the remote db to deal with the pointer for us
SQL> create or replace function ReturnXMLFile( fileID number, offset integer, amount integer ) return varchar2 is
2          buffer varchar2(32767);
3 begin
4          select
5                  DBMS_LOB.SubStr( x.xml_file, amount, offset )
6                          into
7                  buffer
8          from    xml_files x
9          where   x.file_id = fileID;
10
11          return( buffer );
12 end;
13 /
Function created.
SQL> --// we now can access the contents of the remote LOB (only in 4000 char chunks using this example)
SQL> select
2          file_id,
3          ReturnXMLFile@remote_db( x.file_id, 1, 4000 ) as "Chunk_1"
4 from       xml_files@remote_db x;
   FILE_ID Chunk_1
         1 <root><text>What do you want, universe?</text></root>
SQL> --// we can also copy the entire remote LOB across into a local LOB and use the local one
SQL> declare
2          c               clob;
3          pos             integer;
4          iterations      integer;
5          buf             varchar2(20);   --// small buffer for demonstration purposes only
6 begin
7          DBMS_LOB.CreateTemporary( c, true );
8
9          pos := 1;
10          iterations := 1;
11          loop
12                  buf := ReturnXMLFile@remote_db( 1, pos, 20 );
13                  exit when buf is null;
14                  pos := pos + length(buf);
15                  iterations := iterations + 1;
16                  DBMS_LOB.WriteAppend( c, length(buf), buf );
17          end loop;
18
19          DBMS_OUTPUT.put_line( 'Copied '||length(c)||' byte(s) from remote LOB' );
20          DBMS_OUTPUT.put_line( 'Read Iterations: '||iterations );
21          DBMS_OUTPUT.put_line( 'LOB contents (1-4000):'|| DBMS_LOB.SubStr(c,4000,1) );
22
23          DBMS_LOB.FreeTemporary( c );
24 end;
25 /
Copied 53 byte(s) from remote LOB
Read Iterations: 4
LOB contents (1-4000):<root><text>What do you want, universe?</text></root>
PL/SQL procedure successfully completed.
SQL> The concern is the size of the LOB. It does not always make sense to access the entire LOB in the database. What if that LOB is a 100GB in size? Irrespective of how you do it, selecting that LOB column from that table will require a 100GB of data to be transferred from the database to your client.
So you need to decide WHY you want the LOB on the client (which will be the local PL/SQL code in case of dealing with a LOB on a remote database)? Do you need the entire LOB? Do you need a specific piece from it? Do you need the database to first parse that LOB into a more structured data struct and then pass specific information from that struct to you? Etc.
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Hello,
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System.Data.SqlClient.SqlException -- Timeout expired. The timeout period elapsed prior to completion of the operation or the server is not responding.
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Source
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Some questions:
Are there any other databases running on this Std Edition SQL service?
[a] Yes there are, we have Kaspersky enterprise DB, Report Server DB and local application DB.
Are there any other services running on this WSUS Server?
[b] Yes there are, we have Active Directory, Kaspersky enterprise, SQL Server 2005, and WSUS all on the same server.
How many days since your WSUS server was first installed?
[c] It's been about a year now.
What is the physical size of the SUSDB.mdf file?
[d] 9,666,752 KB
What is the hardware configuration of this machine, including disk drives?
[e] Intel Xeon 1.86, 2GB Ram, HD C: 39GB - E: 25.2, running Windows Server 2003 R2 SP2.
How many client systems are you servicing from this WSUS Server?
[f] Around 40.
What products/classifications are you synchronizing.
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There's also no doubt that some of your performance issues are directly related to memory starvation.
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1. Shutdown the Update Services service, SQL Server database engine, and any other services dependent on the SQL Server database engine (Kapersky, and other reporting applications). Disconnect from the network to temporarly eliminate DC traffic. (You could also shutdown the AD services, but disconnecting the network cable is ever-so-much easier.) Defragment ALL drives.
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Lawrence Garvin, M.S., MCITP(x2), MCTS(x5), MCP(x7), MCBMSP
Principal/CTO, Onsite Technology Solutions, Houston, Texas
Microsoft MVP - Software Distribution (2005-2009)

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Edited by: jainprit on Nov 7, 2010 10:29 PM

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Hi dev,
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Regards,
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Cursor_sharing=similar or cursor_sharing=exact

Hai,
I have doubt regarding setting cursor_sharing parameter exact and similar at session level.
On my database cursor_sharing is set similar at system level.
test >show parameter cursor
NAME                                 TYPE                             VALUE
cursor_sharing                       string                           SIMILARI have fired a simple select statement without setting any cursor_sharing at session level
TEST >variable b1 number;
TEST >exec :b1:=7499;
PL/SQL procedure successfully completed.
Elapsed: 00:00:00.00
TEST >select empno,job from emp where job='SALESMAN' and empno=:b1;
     EMPNO JOB
      7499 SALESMANchecking the hash value for query fired
test >select sql_text,invalidations,hash_value,executions,loads from v$sqlarea
16:14:50   2 where sql_text like '%select empno,job from%';
SQL_TEXT
INVALIDATIONS HASH_VALUE EXECUTIONS      LOADS
select empno,job from emp where job=:"SYS_B_0" and empno=:b1
            0 3727168047          1          1Literal job='SALESMAN' is converted into system generated bind variable job=:"SYS_B_0" as my cursor_sharing=similar
Fired the same statement by setting cursor_sharing=exact at session level
TEST >alter session set cursor_sharing=exact;
Session altered.
Elapsed: 00:00:00.00
16:15:25 TEST >select empno,job from emp where job='SALESMAN' and empno=:b1;Checking the hash value for newly fired query with cursor_sharing=exact
SQL_TEXT
INVALIDATIONS HASH_VALUE EXECUTIONS      LOADS
select empno,job from emp where job='SALESMAN' and empno=:b1
            0 2065003705          1          1
select empno,job from emp where job=:"SYS_B_0" and empno=:b1
            0 3727168047          1          1literal job='SALESMAN' is not converted into bind variable as my cursor_sharing=exact
At the same session fired the same query by setting cursor_sharing=similar ..to check which hash value would be shared.
16:15:28 TEST >alter session set cursor_sharing=similar;
Session altered.
Elapsed: 00:00:04.09
17:27:54 TEST >select empno,job from emp where job='SALESMAN' and empno=:b1;
     EMPNO JOB
      7499 SALESMAN
16:28:26 test >select sql_text,invalidations,hash_value,executions,loads from v$sqlarea
17:28:13   2 where sql_text like '%select empno,job from%';
SQL_TEXT
INVALIDATIONS HASH_VALUE EXECUTIONS      LOADS
select empno,job from emp where job='SALESMAN' and empno=:b1
            0 2065003705          2          *2*
select empno,job from emp where job=:"SYS_B_0" and empno=:b1
            0 3727168047          1          1The hash value 2065003705 (cursor_sharing=exact) is shared as executions column is changed from 1 to 2.
So after setting parameter cursor_sharing = similar why the hash value of 3727168047(cursor_sharing=similar)
is not shared?I guess something is cached at session level but i want to know the exact reason..
Again i flushed the shared pool
test >alter system flush shared_pool;
System altered.
Elapsed: 00:00:03.09
17:39:40 test >select sql_text,invalidations,hash_value,executions,loads from v$sqlarea
17:39:44   2 where sql_text like '%select empno,job from%';
SQL_TEXT
INVALIDATIONS HASH_VALUE EXECUTIONS      LOADS
select empno,job from emp where job='SALESMAN' and empno=:b1
            0 2065003705          0          2The hash value of 3727168047(cursor_sharing=similar) is removed ..not hash value 2065003705
What is the reason behind that ...
Regards,
Meeran

Meeran wrote:
The hash value 2065003705 (cursor_sharing=exact) is shared as executions column is changed from 1 to 2.
So after setting parameter cursor_sharing = similar why the hash value of 3727168047(cursor_sharing=similar)
is not shared?I guess something is cached at session level but i want to know the exact reason..Because there is a query in the shared_pool with same literal value so it doesn't have to use the hash 3727168047 and substitute the bind where it already has a plan for the same statement which is 2065003705.
I think with setting CURSOR_SHARING=similar again, If you try the query with JOB='ANALYST' then it will use the plan 3727168047 and substitute the bind with 'ANALYST'.
Again i flushed the shared pool
test >alter system flush shared_pool;
System altered.
Elapsed: 00:00:03.09
17:39:40 test >select sql_text,invalidations,hash_value,executions,loads from v$sqlarea
17:39:44   2 where sql_text like '%select empno,job from%';
SQL_TEXT
INVALIDATIONS HASH_VALUE EXECUTIONS      LOADS
select empno,job from emp where job='SALESMAN' and empno=:b1
0 2065003705          0          2The hash value of 3727168047(cursor_sharing=similar) is removed ..not hash value 2065003705
What is the reason behind that ...If you have noticed, the executions for the hash plan 2065003705 are 0 after the shared_pool flushing. It seems that with flush shared_pool, oracle doesn't flush the queries with literals and just reset their stats. As literals are always the culprits.
You may also wanna read this, as good document on CURSOR_SHARING.

PL/SQL reuse in ADF

Is disabling the use of application module pooling good practice for intranet applications where the number of users are known in advance (although in the thousands)? This was suggested as a solution to limit the amount of recoding that will be required of existing PL/SQL programs that make extensive use of global temp tables/package variables/etc. By disabling pooling (and a few other tweaks) the user will access the db with the same session and hence database state is preserved between requests. But in my experience a lot of PLSQL code is written to fit specific use cases (mostly on Forms) without considering the need to reuse the code in any other context (although I must admit that it can easily happen in any other language). I have repeatedly tried to explain that state is better maintained and much easier to deal with if it sits on the application but perhaps I'm wrong. Any advice will be much appreciated.

Hi,
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PL/SQL procedure is 10x slower when running from weblogic

Hi everyone,
we've developed a PL/SQL procedure performing reporting - the original solution was written in Java but due to performance problems we've decided to switch this particular piece to PL/SQL. Everything works fine as long as we execute the procedure from SQL Developer - the batch processing 20000 items finishes in about 80 seconds, which is a serious improvement compared to the previous solution.
But once we call the very same procedure (on exactly the same data) from weblogic, the performance seriously drops - instead of 80 seconds it suddenly runs for about 23 minutes, which is 10x slower. And we don't know why this happens :-(
We've profiled the procedure (in both environments) using DBMS_PROFILER, and we've found that if the procedure is executed from Weblogic, one of the SQL statements runs noticeably slower and consumes about 800 seconds (90% of the total run time) instead of 0.9 second (2% of the total run time), but we're not sure why - in both cases this query is executed 32742-times, giving 24ms vs. 0.03ms in average.
The SQL is
SELECT personId INTO v_personId FROM (
        SELECT personId FROM PersonRelations
        WHERE extPersonId LIKE v_person_prefix || '%'
) WHERE rownum = 1;Basically it returns an ID of the person according to some external ID (or the prefix of the ID). I do understand why this query might be a performance problem (LIKE operator etc.), but I don't understand why this runs quite fast when executed from SQL Developer and 10x slower when executed from Weblogic (exactly the same data, etc.).
Ve're using Oracle 10gR2 with Weblogic 10, running on a separate machine - there are no other intensive tasks, so there's nothing that could interfere with the oracle process. According to the 'top' command, the wait time is below 0.5%, so there should be no serious I/O problems. We've even checked JDBC connection pool settings in Weblogic, but I doubt this issue is related to JDBC (and everything looks fine anyway). The statistics are fresh and the results are quite consistent.
Edited by: user6510516 on 17.7.2009 13:46

The setup is quite simple - the database is running on a dedicated database server (development only). Generally there are no 'intensive' tasks running on this machine, especially not when the procedure I'm talking about was executed. The application server (weblogic 10) is running on different machine so it does not interfere with the database (in this case it was my own workstation).
No, the procedure is not called 20000x - we have a table with batch of records we need to process, with a given flag (say processed=0). The procedure reads them using a cursor and processes the records one-by-one. By 'processing' I mean computing some sums, updating other table, etc. and finally switching the record to processed=1. I.e. the procedure looks like this:
CREATE PROCEDURE process_records IS
    v_record records_to_process%ROWTYPE;
BEGIN
     OPEN records_to_process;
     LOOP
          FETCH records_to_process INTO v_record;
          EXIT WHEN records_to_process%NOTFOUND;
          -- process the record (update table A, insert a record into B, delete from C, query table D ....)
          -- and finally mark the row as 'processed=1'
     END LOOP;
     CLOSE records_to_process;
END process_records;The procedure is actually part of a package and the cursor 'records_to_process' is defined in the body. One of the queries executed in the procedure is the SELECT mentioned above (the one that jumps from 2% to 90%).
So the only thing we actually do in Weblogic is
CallableStatement cstmt = connection.prepareCall("{call ProcessPkg.process_records}");
cstmt.execute();and that's it - there is only one call to the JDBC, so the network overhead shouldn't be a problem.
There are 20000 rows we use for testing - we just update them to 'processed=0' (and clear some of the other tables). So actually each run uses exactly the same data, same code paths and produces the very same results. Yet when executed from SQL developer it takes 80 seconds and when executed from Weblogic it takes 800 seconds :-(
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Installation of Preferences Pane on remote Server OSX fails

On an OSXServer mini which I connect to with RDC, I am unable to install any Preference Pane programs such as Slink or Squeeze.
I have full admin access to that machine, it's a dedicated database server, nothing exotic running on it, latest OS10.6.4, but I get the message;
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There is no mouse or screen connected to this mini, RDC access only.
The PrefPane icons become visible but remain greyed out.
Remote Management is activated in the ServerAdmin.
A very similar configuration hosted elsewhere gives no problem. Same settings, same RDC access, same OS.
At this point I'm at a loss. Clues anyone?
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The problem isn't the filesystem per se. It's bad software quality if pathnames defined wrong or multiple times with different notation. Often there is only one or two letters with the wrong upper or lower case. I guess in the current Flash installer this is the case. With the previous versions I had no problems.
Am 03.11.2013 um 00:41 schrieb Mike M <[email protected]>:
Re: Installation of Flash Player 11.9 under OSX fails with case-sensitive filesystem!?
created by Mike M in Installing Flash Player - View the full discussion
My Mini isn't case sensitive, so I can't really say but I had two iMacs when I worked at Intuit that were case sensitive and they had all kinds of software installation issues. One of the Mac developers at Mountain View told me that Case Sesnitive shouldn't be chosen as a format except when a system is isolated and used as a testing server. For a workstation or home computer, it's a terrible choice for a setup.
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Global temp table trigger error on Oracle AS

we have a set of triggers that load a temp table in the before delete,update and process the table in an after statement trigger. the data that's loaded is a complaintid and when the complaintid is selected into a variable in the after statement, a No data found error is fired. This only happens on Oracle AS both 9i and 10g, it does not happen on jboss. All the app servers use connection pooling and they are 9i Enterprise Edition Dedicated database servers.
Is it possible that there is a bug in Oracle AS that allows multiple sessions to affect the same global variables ?
Sorry it's a long one, but I wanted to include everything I could
table creation script.
CREATE GLOBAL TEMPORARY TABLE TEMPEVENTS
(     COMPLAINTID VARCHAR2(20) NOT NULL ENABLE,
     COMPLAINTEVENTID NUMBER NOT NULL ENABLE,
     STARTDATE DATE,
     EVENTTYPE NUMBER,
     EVENTSUBTYPE NUMBER,
     DELETED NUMBER
) ON COMMIT DELETE ROWS
Before update trigger-- as a test I saved the data in a permanent table and all columns have usable values.
create or replace trigger BeforeUpdateReportDataROW
BEFORE Delete or Update of deleted, startdate on complaintevents
FOR EACH ROW
BEGIN
IF (DELETING AND :old.deleted = 0) OR (UPDATING AND :new.deleted=1 AND :old.startDate = :new.startDate) THEN
     TEMPDATA.v_triggerType := 'D';
ELSIF UPDATING AND :old.deleted=1 AND :old.startDate = :new.startDate THEN /*undeleting*/
     TEMPDATA.v_triggerType := 'U';
ELSIF UPDATING AND :old.startDate != :new.startDate THEN /*new date*/
     TEMPDATA.v_triggerType := 'S';
ELSE
     TEMPDATA.v_triggerType := 'N';
END IF;
TEMPDATA.v_NumEntries := TEMPDATA.v_NumEntries + 1;
TEMPDATA.v_complaintids(TEMPDATA.v_NumEntries) := :old.complaintid;
TEMPDATA.v_complainteventids(TEMPDATA.v_NumEntries) := :old.complainteventid;
END;
After statement trigger -- the error happens on the
SELECT complaintid
INTO complaintid
FROM complaintevents
WHERE complaintid = tempdata.v_complaintids (loop_index)
AND complainteventid = tempdata.v_complainteventids (loop_index);
statement. this is all one transaction the complaintid is loaded from the complaintevent table, and is not a primary key, nor is there only one record in the complaintevent table for each complaintid.
create or replace trigger complaintevents_del_upd_trig
AFTER DELETE OR UPDATE OF deleted, startdate
ON complaintevents
DECLARE
complaintid VARCHAR2 (20);
loop_index NUMBER;
hold_complaintid VARCHAR2 (20);
BEGIN
IF tempdata.v_triggertype = 'D'
THEN /*deleting event*/
hold_complaintid := ' ';
FOR loop_index IN 1 .. tempdata.v_numentries
LOOP
SELECT complaintid
INTO complaintid
FROM complaintevents
WHERE complaintid = tempdata.v_complaintids (loop_index)
AND complainteventid = tempdata.v_complainteventids (loop_index);
IF hold_complaintid != complaintid
THEN
INSERT INTO tempevents
(complaintid, complainteventid, startdate, eventtype,
eventsubtype, deleted)
SELECT complaintid, complainteventid, startdate, eventtype,
eventsubtype, deleted
FROM complaintevents
WHERE complaintid = tempdata.v_complaintids (loop_index);
END IF;
DELETE tempevents
WHERE complainteventid =
tempdata.v_complainteventids (loop_index)
OR deleted = 1;
hold_complaintid := complaintid;
END LOOP;
ELSIF tempdata.v_triggertype = 'U'
THEN /*undeleting*/
hold_complaintid := ' ';
FOR loop_index IN 1 .. tempdata.v_numentries
LOOP
SELECT complaintid
INTO complaintid
FROM complaintevents
WHERE complaintid = tempdata.v_complaintids (loop_index)
AND complainteventid = tempdata.v_complainteventids (loop_index);
IF hold_complaintid != complaintid
THEN
INSERT INTO tempevents
(complaintid, complainteventid, startdate, eventtype,
eventsubtype, deleted)
SELECT complaintid, complainteventid, startdate, eventtype,
eventsubtype, deleted
FROM complaintevents
WHERE complaintid = tempdata.v_complaintids (loop_index);
END IF;
DELETE tempevents
WHERE deleted = 1;
INSERT INTO tempevents
(complaintid, complainteventid, startdate, eventtype,
eventsubtype, deleted)
SELECT complaintid, complainteventid, startdate, eventtype,
eventsubtype, 0
FROM complaintevents
WHERE complainteventid =
tempdata.v_complainteventids (loop_index);
hold_complaintid := complaintid;
END LOOP;
ELSIF tempdata.v_triggertype = 'S'
THEN /*date change*/
hold_complaintid := ' ';
FOR loop_index IN 1 .. tempdata.v_numentries
LOOP
SELECT complaintid
INTO complaintid
FROM complaintevents
WHERE complaintid = tempdata.v_complaintids (loop_index)
AND complainteventid = tempdata.v_complainteventids (loop_index);
IF hold_complaintid != complaintid
THEN
INSERT INTO tempevents
(complaintid, complainteventid, startdate, eventtype,
eventsubtype, deleted)
SELECT complaintid, complainteventid, startdate, eventtype,
eventsubtype, deleted
FROM complaintevents
WHERE complaintid = tempdata.v_complaintids (loop_index);
END IF;
DELETE tempevents
WHERE deleted = 1;
hold_complaintid := complaintid;
END LOOP;
ELSE
RETURN;
END IF;
END;

CREATE GLOBAL TEMPORARY TABLE test_glb ON COMMIT DELETE ROWS
AS SELECT * FROM test1;btw I'm assuming you are just using the SELECT statement to copy the definition of test1. Since DDL statements commit, there will be no rows in test_glb after creating it.
Edited by: William Robertson on Feb 23, 2009 7:31 AM

How to use single installation of Nokia Ovi Suite ...

I want to help my adult son set up his (different model-) Nokia Smartphone.
How to use the Nokia Ovi Suit already installed for a different user?

Hey,
If i hav understood ur issue correctly, u want to share the same nokia ovi suite(Contacts, Messages, Calendar and tasks etc) of ur entire family with single nokia ovi suite? If my understaning is wrong, please do correct/educate me.
AFAIK, nokia ovi suite does not work the same way how pc suite works at least when it comes to PIM sync like Contacts, Messages, calendar and tasks etc.,
In case of PC Suite, u can connect more than a device and u can sync/store messages/contacts/calendar etc separately and u can switch to the next device, there is no dedicated database to store any of ur data, if u r synching with pc suite.
In case of Ovi Suite, it has got a database where it stores user's info in a database, so u cannot sync multiple phone's data with single nokia ovi suite.
If this is what u xpct from our forum, read my signature and do the needful
If my post helped you, click on Kudos button and if my solution provided is opt 2 u, accpt my solution

Dedicated database & cursor_sharing

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