If a view object query returns no rows, can the vacuum to be tested at all?

All those who know or have also experienced:

I guess that the answer should be Yes, but I tried anyway, I still didn't worked. Here is the code (it's a method behind a command button, a bean of support (I use JDeveloper 10.1.3.4).) In the code, LoggedInStudent is the name of a view object; ZBLCModule is the name of the application module):

    public String commandButton1_action() {
        FacesContext fc = FacesContext.getCurrentInstance();
        ValueBinding vb = fc.getApplication().createValueBinding("#{data}");
        BindingContext bc = (BindingContext)vb.getValue(fc);
        DCDataControl dc = bc.findDataControl("ZBLCModuleDataControl");
        ApplicationModule am = (ApplicationModule)dc.getDataProvider();
        ZBLCModuleImpl zblcam = (ZBLCModuleImpl)am;
        LoggedInStudentImpl studentsFound = (LoggedInStudentImpl)zblcam.getLoggedInStudent();
        
        String navCase = null;
        
        // Test (1): if the view cache is empty; always bombs up the application if it IS empty:
        if(studentsFound.getAllRowsInRange().length == 0) {
            navCase = "userNotFound";
        // (2) The following three tests gets to run only when the cache is not empty; they work fine.
        } else if (((Number)studentsFound.first().getAttribute("HoursAttm")).floatValue() == 0.0) {
            navCase = "noHours";
        } else if (((Number)studentsFound.first().getAttribute("Balance")).floatValue() > 0.0) {
            navCase = "notZero";
        } else if (!(studentsFound.first().getAttribute("Validated").equals(" "))) {
            navCase = "validated";
        } else {
            navCase = "zeroBal";
        }
        return navCase;
    }

When the view object query returns a line, the whole of the application works without error. When the query returns no rows, test (1) always bombs toward the top of the application, prompting a Houston-30003 error.

(1) test, I tried the following:

  if (studentsFound.getAllRowsInRange().length == 0)
  if (studentsFound.first() == null)
  if (studentsFound.getEstimatedRowCount() == 0)
  if (studentsFound.isDead()) //I do not know what isDead() does; just tried desperately.
  if (studentsFound.equals(null))
  if (studentsFound.getCurrentRow() == null)

With each of these events, I got an error of Houston-30003. It does not matter what looks like the conditional test; It is important only when the objects from view cache is empty. If the view cache is not empty, everything, including the test (1), works very well. And when the cache is empty is not because of the failure of the connection to the database, but because the student is not in the data table and line are for the student.

It is a requirement of the company to do something when the view object query returns no rows. Can it be tested at all? How?

Or is there something wrong in the first lines in the method before the {color: green} String navCase = null; {color} line?

Thank you very much for your help!

Newman

Hello

What you have done, is to get a handle to the object that CAN execute queries to the database.
However, you do not query the database.

Just add:

  LoggedInStudentImpl studentsFound = (LoggedInStudentImpl)zblcam.getLoggedInStudent();
  //New line
  studentsFound.executeQuery();

The code that Shay has given you is when you do not have a request for all module, but since you are talking about a command etc button I guess that the module of the application is already active.
The line I gave you should be enough to make it work.

I'd be careful with the

studentsFound.hasNext();

I suggest to use estimatedRowCount();

-Anton

Tags: Java

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Execution Plan
----------------------------------------------------------
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---------------------------------------------------------------------------
| Id  | Operation          | Name | Rows  | Bytes | Cost (%CPU)| Time     |
---------------------------------------------------------------------------
|   0 | SELECT STATEMENT   |      |     5 |    40 |     4  (25)| 00:00:01 |
|   1 |  HASH GROUP BY     |      |     5 |    40 |     4  (25)| 00:00:01 |
|   2 |   TABLE ACCESS FULL| EMP  |    14 |   112 |     3   (0)| 00:00:01 |
---------------------------------------------------------------------------

And compare it to the one with the double aggregates:

SQL> select sum(count(decode(job, 'CLERK', 1, null))) CLERKS
  2       , sum(count(decode(job, 'SALESMAN', 1, null))) SALESMANS
  3  from scott.emp group by job;

    CLERKS  SALESMANS
---------- ----------
         4          4

Execution Plan
----------------------------------------------------------
Plan hash value: 417468012

----------------------------------------------------------------------------
| Id  | Operation           | Name | Rows  | Bytes | Cost (%CPU)| Time     |
----------------------------------------------------------------------------
|   0 | SELECT STATEMENT    |      |     1 |     8 |     4  (25)| 00:00:01 |
|   1 |  SORT AGGREGATE     |      |     1 |     8 |     4  (25)| 00:00:01 |
|   2 |   HASH GROUP BY     |      |     1 |     8 |     4  (25)| 00:00:01 |
|   3 |    TABLE ACCESS FULL| EMP  |    14 |   112 |     3   (0)| 00:00:01 |
----------------------------------------------------------------------------

There are GROUP BY hash and SORT GLOBAL times.

It is really unnecessary to an aggregate on an aggregate - if two aggregates are used "in the same group level.
Sum() aggregates are used on an already aggregated value, so it doesn't look like Oracle which actually cures like 'first do the internal aggregate using the group specified by and then do the external aggregation on the result with any group.'

Look at this example where I combine aggregates "double" with "single" aggregates:

SQL> select sum(count(decode(job, 'CLERK', 1, null))) CLERKS
  2       , sum(count(decode(job, 'SALESMAN', 1, null))) SALESMANS
  3       , count(decode(job, 'SALESMAN', 1, null)) SALESMANS2
  4       , count(*) COUNTS
  5  from scott.emp group by job;

    CLERKS  SALESMANS SALESMANS2     COUNTS
---------- ---------- ---------- ----------
         4          4          1          5

Execution Plan
----------------------------------------------------------
Plan hash value: 417468012

----------------------------------------------------------------------------
| Id  | Operation           | Name | Rows  | Bytes | Cost (%CPU)| Time     |
----------------------------------------------------------------------------
|   0 | SELECT STATEMENT    |      |     1 |     8 |     4  (25)| 00:00:01 |
|   1 |  SORT AGGREGATE     |      |     1 |     8 |     4  (25)| 00:00:01 |
|   2 |   HASH GROUP BY     |      |     1 |     8 |     4  (25)| 00:00:01 |
|   3 |    TABLE ACCESS FULL| EMP  |    14 |   112 |     3   (0)| 00:00:01 |
----------------------------------------------------------------------------

When you mix "doubles" and "single" aggregates, Oracle decides that unique aggregates belong to the 'outer' aggregation
SALESMAN2 did a count on the aggregated work column which is the result of the 'internal' group by - so only 1.
The count (*) is also the result of the aggregation of the 'internal '.

I don't know if it's documented or if it is an 'effect' of internal code used for GROUPING SETS or the internal code used to enable the analytical functions like this:

SQL> select count(decode(job, 'CLERK', 1, null)) CLERKS
  2       , count(decode(job, 'SALESMAN', 1, null)) SALESMANS
  3       , sum(count(decode(job, 'CLERK', 1, null))) over () CLERKS2
  4       , sum(count(decode(job, 'SALESMAN', 1, null))) over () SALESMANS2
  5  from scott.emp group by job;

    CLERKS  SALESMANS    CLERKS2 SALESMANS2
---------- ---------- ---------- ----------
         0          0          4          4
         4          0          4          4
         0          0          4          4
         0          0          4          4
         0          4          4          4

Execution Plan
----------------------------------------------------------
Plan hash value: 4115955660

----------------------------------------------------------------------------
| Id  | Operation           | Name | Rows  | Bytes | Cost (%CPU)| Time     |
----------------------------------------------------------------------------
|   0 | SELECT STATEMENT    |      |     5 |    40 |     4  (25)| 00:00:01 |
|   1 |  WINDOW BUFFER      |      |     5 |    40 |     4  (25)| 00:00:01 |
|   2 |   SORT GROUP BY     |      |     5 |    40 |     4  (25)| 00:00:01 |
|   3 |    TABLE ACCESS FULL| EMP  |    14 |   112 |     3   (0)| 00:00:01 |
----------------------------------------------------------------------------

Personally, I think that I would have preferred if Oracle has raised an error on this "double aggregation" and therefore require me to write this way (if it's the result I wanted):

select sum(CLERKS), sum(SALESMANS)
from (select count(decode(job, 'CLERK', 1, null)) CLERKS, count(decode(job, 'SALESMAN', 1, null)) SALESMANS
         from emp group by job)

I don't really see a good use case for aggregations of 'double'-, but rather that he could give you undetected bugs in your code, if you happen to do double aggregation without noticing.

Interesting thing to know ;-)

Attributes XML makes my query returns no rows

Hi all

I have a strange problem.

I ask an XML, but the attributes in one of the tags my query will return no rows. If I delete the attributes, the query works as expected.

The XML code is below; This is the Report tag attributes that cause problems:

<result errorCode="0">
     <return>
          <Report
               xsi:schemaLocation="Items_x0020_status_x0020_information http://******-****/ReportServer?%2FReports%2FContent%20Producer%20Reports%2FItems%20status%20information&amp;rs%3AFormat=xml&amp;rc%3ASchema=True"
               Name="Items status information" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
               xmlns="Items_x0020_status_x0020_information">
               <Tablix1>
                    <Details_Collection>
                         <Details ItemId="914P7" Username="test" user_role="IT"
                              first_name="Barry" last_name="Donovan" organisation=""
                              content_format="On_Screen" modified_date="26/05/2011 13:16:49"
                              item_status="Draft" status_date="" component_name="" demand="" />
                    </Details_Collection>
               </Tablix1>
          </Report>
     </return>
</result>

My query is:

     select
            a.item_id
           ,a.username
           ,a.user_role
           ,a.first_name
           ,a.last_name
           ,a.supplier_id
           ,a.format
           ,a.modified_date
           ,a.item_status
           ,a.completion_date
           ,a.component_code

         from   dual
               ,xmltable
                ('/result/return/Report/Tablix1/Details_Collection/Details'
                   passing p_xml
                   columns
                      item_id         varchar2(1000) path '@ItemId'
                     ,username        varchar2(1000) path '@Username'
                     ,user_role       varchar2(1000) path '@user_role'
                     ,first_name      varchar2(1000) path '@first_name'
                     ,last_name       varchar2(1000) path '@last_name'
                     ,supplier_id     varchar2(1000) path '@organisation'
                     ,format          varchar2(1000) path '@content_format'
                     ,modified_date   varchar2(1000) path '@modified_date'
                     ,item_status     varchar2(1000) path '@item_status'
                     ,completion_date varchar2(1000) path '@status_date'
                     ,component_code  varchar2(1000) path '@demand'
                ) a;

I tried to strip the attributes to the tag, which works, but some XML I look back are large enough (number of records), so that cause problems in itself. I would rather deal with it and don't mess with the XML itself if possible.

Any help would be much appreciated!

Thank you much in advance.

Robin

Published by: User_resU on April 12, 2012 14:50

The element of report and its children belong to a default namespace.
You have stated that in the request too:

xmltable
(
xmlnamespaces('Items_x0020_status_x0020_information' as "ns0"),
'/result/return/ns0:Report/ns0:Tablix1/ns0:Details_Collection/ns0:Details'
   passing

SQL query returning no rows, please help!
I have a table that contains the user checks for a specific procedures alongwith the date stamp. Now, I want the list of all procedures that are not accessible by users in the last 6 months. Or, all of the procedures that have not been used/accessible during the last 6 months.

That's what I'm trying, but is does not return all rows:

SELECT DISTINCT proc_name,
TRUNC (entry_date)
OF log_web
WHERE NOT IN (SELECT proc_name proc_name
OF log_web
WHERE TRUNC (entry_date) > TRUNC (SYSDATE - 180))
ORDER BY DESC 2

Please notify.
Thank you in advance.
Hello

NOT IN never returns TRUE if the subquery returns NULL values. If proc_name doesn't have a NOT NULL constraint, change the subquery to
```
WHERE        proc_name     NOT IN ( SELECT  proc_name
                            FROM      log_web
                     WHERE      entry_date     > TRUNC (SYSDATE - 180)
                     AND      proc_name     IS NOT NULL
                      )
```
I don't see any other suspect.
Post a small example of data (CREATE TABLE and INSERT statements) where the query produces results worng.

single line sub query returns multiple rows
Hi, please help me to solve this, working with oracle 11g.

Update t1 set t1.twyindex = twypoly (select twyindex from twyinfo where t1.id = t2.id t2);

the error message is:
*
ERROR on line 1:
ORA-01427: einreihig subquery returns multiple rows

Thank you
don123 wrote:
Hi paul, thanks...

duplicate existing due to the business logic data.

can I use the SQL mentioned above for all cases?

is it mandatory to remove duplicates?

Please provide your suggestions...

If the company says duplicates are allowed, you have to ask the person who wants what, of the different twyindexes, that they want to use
updating twyinfo table...

I use the SQL proposed until they tell you that twyindex to use.

Interactive report that returns 0 rows on the initial screen of forcing
How can I get the initial display of my interactive to have 0 rows (and quickly) reports on the initial display, so that the user can determine the lines they want without having to wait for the report view without much in the way of the filters?

My reports many lines of 50-100 k with several joins of tables: so they are slow and the initial default result set is not useful for them, until they start of construction interactive filters themselves.

I tried to add a default I / filter R which is never true, return 0 rows, but if I have good corrrectly, APEX will execute the sql 1, returning the default #of ranks backward, THEN that wraps like a subselect and applies to the i / R filters. So, I still have to wait for the report of 'run' before its filtered to 0 rows...

I'm experimenting also with a flag of pxx_firsttime, intiall value, and according to my report SQL NVL(:Pxx_FIRSTTIME,'Y') = n and (rest of joins of tables)...
the problem I have with this is, how can I get this option the value N as the user begins to use the interactive report filters, etc., which seem NOT to resubmit the page?

Thank you
Hello

I tried to add a default I / filter R which is never true, return 0 rows, but if I have good corrrectly, APEX will execute the sql 1, returning back by default #of lines, THEN that wraps like a subselect and applies the > I / R filters. So, I still have to wait for the report of 'run' before its filtered to 0 rows...

Yes, you are right.

I assume that you already have using the paging Type as line from X to Y.

the problem I have with this is, how can I get this option the value N as the user begins to use the interactive report filters, etc., which seem NOT to resubmit the page?

Whenever the user do something with 'Actions', APEX IR will get updated. Thus, to create a dynamic Action that will be triggered before the refreshment of your IR, update the session state from P1_FIRSTTIME_FLAG to "n".

Kind regards
Hari

Can't understand why this query returns multiple lines with the same data
Hi all
I am a relative novice and self-taught when it comes to SQL. I wrote a query to our reporting tool that returns multiple rows, and I can't understand why. I know that I can use the SELECT DISTINCT option, but it really slows the execution when I do. I'd really rather understand if I can change the code to avoid the multiples. This is the query. I've included a few statements in italics to help explain the break. Any ideas?

SELECT MATSITE, MATPONUM, FIRSTRECPTDATE
Of
Subquery that concludes the first date on which purchase orders have been implemented with ACK State
(SELECT ACKSTAT. PONUM AS 'ACKPONUM', (MIN (ACKSTAT. CHANGEDATE)) AS 'FIRSTACKDATE '.
OF PZMAX. POSTATUS ACKSTAT
WHERE (ACKSTAT. STATE = 'ACK') AND (ACKSTAT.ORGID ='CGSALTUS)
GROUP OF ACKSTAT. PONUM),
Subquery that concludes the first reception against a purchase order transaction for purposes of comparison
(SELECT TRANS. PONUM AS "MATPONUM", TRANS. SITEID AS 'MATSITE', (MIN (TRANS. TRANSDATE)) AS 'FIRSTRECPTDATE '.
OF PZMAX. MATRECTRANS TRANS
WHERE (TRANS.ORGID ='CGSALTUS) AND (TRANS. HOUR > =: startDate and TRANS. TRANSDATE < =: endDate)
TRANS GROUP. SITEID, TRANS. PONUM)
WHERE
(ACKPONUM = MATPONUM AND FIRSTRECPTDATE < FIRSTACKDATE) OR (NOT EXISTS (SELECT 1 FROM PZMAX. POSTATUS ACKSTAT2 WHERE (ACKSTAT2. PONUM = MATPONUM) AND (ACKSTAT2. STATE = 'ACK') AND (ACKSTAT2.ORGID ='CGSALTUS)))

The where the instruction is intended to find when one of two conditions exists. ((1) received happened before the command either in ACK or 2) a reception that's happened, but the purchase order is never in ACK State. It seems that this second condition that creates multiple lines.

Any thoughts will be appreciated geratly.

Dave Teece

Rows in the table LT until merger of all workspaces

Database 11.2.0.4
In our environment, we ran a few important updates in the workspaces and then merged these live workspaces. Up to 25% of the data has been updated in those workspaces. When these update batch workspaces have been created, previous workspaces exist who are not yet ready for the merger.
I noticed that the underlying tables of the LT now have about 25% more lines than the live view. We have now discovered that dbms_wm.refreshWorkspace works really poor. This statement is used to take seconds or minutes to the maximum, but can now take half an hour or more.
We recorded a support with Oracle request and provided details of the plan to see if we can get some resolution/advice explaining.
In the meantime, I have a question for the forum help my understanding of the works of the Manager of the workspace.
In the example below, I have table "wm_test_table", "test_workspace1" and "test_workspace2". In "test_workspace1", I update all rows in the table - the table LT now has 2 rows for each record. I merge 'test_workspace1' live and LT still has 2 rows for each record. The other lines are not removed until "test_workspace2" is merged and removed.
```
SQL> -- Create a test table
SQL> create table wm_test_table (
  2     id integer primary key,
  3     name varchar2(100));


Table created.


SQL> -- Insert 1,000 rows
SQL> insert into wm_test_table (
  2     select rownum, 'before'
  3     from dual
  4     connect by level <= 1000);


1000 rows created.


SQL> commit;


Commit complete.


SQL> -- Version enable it
SQL> execute dbms_wm.enableVersioning('wm_test_table');


PL/SQL procedure successfully completed.


SQL> -- Create two workspaces
SQL> execute dbms_wm.createWorkspace('test_workspace1');


PL/SQL procedure successfully completed.


SQL> execute dbms_wm.createWorkspace('test_workspace2');


PL/SQL procedure successfully completed.


SQL> -- Go to test_workspace1 and update all the rows
SQL> execute dbms_wm.goToWorkspace('test_workspace1');


PL/SQL procedure successfully completed.


SQL> update wm_test_table set name = 'after';


1000 rows updated.


SQL> commit;


Commit complete.


SQL> -- Check how many rows in wm_test_table_lt - we expect 2,000 as we haven't merged yet
SQL> select count(*) from wm_test_table_lt;


  COUNT(*)
----------
      2000


SQL> -- Merge and remove test_workspace1
SQL> execute dbms_wm.goToWorkspace('LIVE');


PL/SQL procedure successfully completed.


SQL> execute dbms_wm.mergeWorkspace('test_workspace1', remove_workspace=>true);


PL/SQL procedure successfully completed.


SQL> -- Check how many rows in wm_test_table_lt
SQL> -- I'd hope there'd only be 1,000 but there is 2,000
SQL> select count(*) from wm_test_table_lt;


  COUNT(*)
----------
      2000


SQL> -- Let's see if compressWorkspace will get rid of them
SQL> execute dbms_wm.compressWorkspace( -
>       workspace => 'LIVE',   -
>       auto_commit => true,   -
>       remove_latest_deleted_rows => true);


PL/SQL procedure successfully completed.


SQL> -- They're still there
SQL> select count(*) from wm_test_table_lt;


  COUNT(*)
----------
      2000


SQL> -- Now merge test_workspace2
SQL> execute dbms_wm.mergeWorkspace('test_workspace2', remove_workspace=>true);


PL/SQL procedure successfully completed.


SQL> -- and the additional 1,000 rows are removed
SQL> select count(*) from wm_test_table_lt;


  COUNT(*)
----------
      1000
```
Is it possible to safely remove the extra lines in LT without waiting until we merged the workspaces that existed before the update batch has been done? I hope that it will so improve the performance of refreshWorkspace.

I thought that something like this can do, but it does not remove the other ranks, is:
```
execute dbms_wm.PurgeTable(
 table_id => 'test.wm_test_table', 
 archive_table => null, 
 where_clause => 'id not in (select id from test.wm_test_table)', 
 instant=>null, 
 workspace => 'LIVE', 
 purgeAfter => false);
```
This question is similar to
Lines left in the table LT after removal of the direct workspace and the removal of all workspaces
and
How to delete soft deleted records?
but I'm still not sure.
Thank you
John

Hello

This behavior is expected and it is due to the test_workspace2 workspace. A compression operation will not allow compressed range to include a backup implicit point that is created for a child workspace. This is done to preserve the integrity of this workspace. The initial 1000 lines are all lines that are visible from test_workspace2. Removal of these lines would leave test_workspace2 will 0 lines in there. Lines 1000 updates are the lines that do not appear on LIVE. So, given that the two sets of lines are needed, none of the lines can be deleted physically. A compression operation will never change the view of data for any workspace. It only removes the unnecessary records. The two options in order to be able to compress these lines is to either delete (as you did) or refresh test_workspace2. The refresh operation would move the implicit savepoint for the workspace to a version that isn't after all 2000 lines in the table _LT and allow the dressing to remove first half of them because they are no longer needed by any child workspace.

With respect to the performance of RefreshWorkspace, I would need to see a trace of the transaction file. But who should rather get through the SR you filed.

Kind regards

Ben

Rows from the outer Table shows only not all data.
Hello

I have a line to 80 characters that I import in an external table.

80% imports fine line data, but some lines are cut.

The bytes in the file are as follows.
ABCABC2334 0000001000010000001000000001 000000 00001C A002

Bytes in an external table.
ABCABC2334 0000001000010000001000000001 000000 A002

The bytes in the row of the outer table stop somewhere at the end of 000000 and the 00001C is cut.

What build be the cause of this?

I am able to read the characters at the beginning and towards the end of the record of 80-character line.

The external file below performs the following operations.
ABCABC2334 0000001000010000001000000001 000000 01B A002

I can even make a definition of the external table (c1 char (1), c2 char (1),... c80 (1) tank and all the characters see fine in the specified columns.)

Here is the last definition of the external table. The "middle" column still shows this behavior. Basically, it is in the file and can be seen with every character in the definined line, but not as a group of characters.

DB CHARACTERSET WEBISO8859P1

CREATE TABLE EXT_PROJ_1
(
Field1 tank (6 BYTES),
Field2 float (4 BYTES),
medium (67 BYTES)
field3 tank (3 bytes),
CR tank (2 bytes)
)
EXTERNAL ORGANIZATION
(TYPE ORACLE_LOADER
THE DEFAULT DIRECTORY EXP_DIR
ACCESS SETTINGS
(
RECORDS delimited by '\r\n '.
FIELDS (field1, position(1:6),
position(7:10) Field2.
average position(11:77)
field3 position(78:80).
CR position(81:82)
)
)
LOCATION (EXP_DIR: 'ext_proj_1.txt')
)
REJECT THE LIMIT 1
noPARALLEL
NOMONITORING;

Published by: 917320 on March 13, 2012 09:07
Looking at your table definition:
```
field1 char(6 BYTE),
field2 char(4 BYTE),
middle char(67 BYTE),
field3 char(3 byte),
cr char(2 byte)
```
column in which you will store a string of 80 bytes?

BTW: You said "import into an external table." You import FROM an external table or EXPORT to an external table?

If a view object query returns no rows, can the vacuum to be tested at all?

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