Too many child cursors with reasons unknown

Hi,
I am looking at excessive child cursors for a particular SQL even after setting the CURSOR_SHARING parameter to SIMILAR. I am working on Oracle 10.2.0.4.0 hosted on a Windows 2003 Server. Since the application does not use bind variables I decided to test the efficiency of modifying the CURSOR_SHARING parameter to buy some time before the root cause is fixed.
On querying V$SQL_SHARED_CURSOR I find that none of the flag columns which document the reason for the formation of a child cursor is Y. They are all flagged as N. So, I am perplexed as to why so many child cursors are being generated.
Some statistical information below:
Version Count for the SQL_ID = 23506
Count of hash values for the SQL_ID = 1234048
Total (sum) chunk size for the SQL_ID = 112,436,220
Any clues/directions on how to get about this issue?
Regards

Indeed, histograms are being collected on the columns
that form the predicates of the query. Doesn't this
in fact offset the advantages of using bind variables
to share SQL?Aniruddha,
Correct. If you have a column that you think deserves a histogram then your front-end code has to co-operate with the database to make the histogram as useful as possible.
If you are lucky, this means you can simply write your code to use a literal value for the predicate on that column and only end up with a few distinct versions of the SQL. At the opposite extreme, you could decide that the overhead of having hundreds of versions of the same query is less of a threat than having a really bad execution plan some of the time. In the more subtle cases, you may have to write code that is "histogram-aware" - i.e. it knows that it has to generate one of a few different statements depending on the supplied values.
Histograms and bind variables don't go together comfortably - and that's a little nasty when you mix cursor_sharing=similar and the 10g automatic stats collection routines.
Regards
Jonathan Lewis
http://jonathanlewis.wordpress.com
http://www.jlcomp.demon.co.uk

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Many child cursors on an insert statement

Oracle: 10.2.0.5
Cursor_sharing = exact
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They all have the parsing_schema_name = 'GWYDB'
This is not an issue with multiple copies of the same table in different schemas since the statement has <owner>.<table name>
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insert into schema.mytablue values (:b1.:b2,:b3);

Guess2 wrote:
Oracle: 10.2.0.5
Cursor_sharing = exact
I understand how you get many child cursors with cursor sharing set to exact. However, this is an insert statement. It has a plan_hash_value = 0 and there are not any explain plans in v$sql_plan.
They all have the parsing_schema_name = 'GWYDB'
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this is a 1 line insert statement.
insert into schema.mytablue values (:b1.:b2,:b3);Oracle ERROR indicates something need to change.
post SQL & error code and message that needs to be fixed.

Report causes too many open cursors

Hello there!
I've got the following situation:
I've a very heavy report used for generating our Users Manual. In Reports 6i this Report works fine, generating the Manual works.
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I've used up several gift cards playing games on my iPad. Now I want to put back in my main credit card that I use playing games and it won't take it. Says there are too many cards associated with this apple ID. I have no idea what to do now -- anybody?

I've used up several gift cards playing games on my iPad. Now I want to put back in my main credit card that I use playing games and it won't take it. Says there are too many cards associated with this apple ID. I have no idea what to do now -- anybody?

You can not merge accounts.
Apps are tied to the Apple ID used to download them, you can not transfer them.

TOO many OPEN CURSORS during loop of INSERT's

Running ODP.NET beta2 (can't move up yet but will do that soon)
I don't think it is related with ODP itself but probably on how .Net works with cursors. We have a for/next loop that executes INSERT INTO xxx VALUES (:a,:b,:c)
statements. Apparently, when monitoring v$sysstat (current open cursors) we see these raising with 1 INSERT = 1 cursor. If subsequently we try to perform another action, we get max cursors exceeded. We allready set open_cursor = 1000, but the number of inserts can be very high. Is there a way to release these cursors (already wrote oDataAdaptor.dispose, oCmd.dispose but this does not help.
Is it normal that each INSERT has it's own cursor ? they all have the same hashvalue in v$open_cursor. They seem to be released after a while, especially when moving to another asp.net page, but it's not clear when that happens and if it is possible to force the release of the (implicit?) cursors faster.
Below is a snippet of the code, I unrolled a couple of function-calls into the code so this is just an example, not sure it will run without errors like this, but the idea should be clear (the code looks rather complex for what it does but the unrolled functions make the code more generic and we have a database-independend datalayer):
Try
' Set the Base Delete statement
lBaseSql = _
"INSERT INTO atable(col1,col2,col3) " & _
"VALUES(:col1,:col2,:col3)"
' Initialize a transaction
lTransaction = oConnection.BeginTransaction()
' Create the parameter collection, containing for each
' row in the list the arguments
For Each lDataRow In aList.Rows
lOracleParamters = New OracleParameterCollection()
lOracleParameter = New OracleParameter("luserid", OracleDbType.Varchar2,
_ CType(aCol1, Object))
lOracleParamters.Add(lOracleParameter)
lOracleParameter = New OracleParameter("part_no", OracleDbType.Varchar2, _
CType(lDataRow.Item("col2"), Object))
lOracleParamters.Add(lOracleParameter)
lOracleParameter = New OracleParameter("revision", OracleDbType.Int32, _
CType(lDataRow.Item("col3"), Object))
lOracleParamters.Add(lOracleParameter)
' Execute the Statement;
' If the execution fails because the row already exists,
' then the insert should be considered as succesfull.
Try
Dim aCommand As New OracleCommand()
Dim retval As Integer
'associate the aConnection with the aCommand
aCommand.Connection = oConnection
'set the aCommand text (stored procedure name or SQL statement)
aCommand.CommandText = lBaseSQL
'set the aCommand type
aCommand.CommandType = CommandType.Text
'attach the aCommand parameters if they are provided
If Not (lOracleParameters Is Nothing) Then
Dim lParameter As OracleParameter
For Each lParameter In lOracleParameters
'check for derived output value with no value assigned
If lParameter.Direction = ParameterDirection.InputOutput _
And lParameter.Value Is Nothing Then
lParameter.Value = Nothing
End If
aCommand.Parameters.Add(lParameter)
Next lParameter
End If
Return
' finally, execute the aCommand.
retval = cmd.ExecuteNonQuery()
' detach the OracleParameters from the aCommand object,
' so they can be used again
cmd.Parameters.Clear()
Catch ex As Exception
Dim lErrorMsg As String
lErrorMsg = ex.ToString
If Not lTransaction Is Nothing Then
lTransaction.Rollback()
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Next
lTransaction.Commit()
Catch ex As Exception
lTransaction.Rollback()
Throw New DLDataException(aConnection, ex)
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I have run into this problem as well. To my mind
Phillip's solution will work but seems completey unnecessary. This is work the provider itself should be managing.
I've done extensive testing with both ODP and OracleClient. Here is one of the scenarios: In a tight loop of 10,000 records, each of which is either going to be inserted or updated via a stored procedure call, the ODP provider throws the "too many cursor errors at around the 800th iteration. With over 300 cursors being open. The exact same code with OracleClient as the provider never throws an error and opens up 40+ cursors during execution.
The applicaation I have updates a Oracle8i database from a DB2 database. There are over 30 tables being updated in near real time. Reusing the command object is not an option and adding all the code Phillip did for each call seems highly unnecessary. I say Oracle needs to fix this problem. As much as I hate to say it the microsoft provider seems superior at this point.

Runtime Error - DBIF_RSQL_INVALID_RSQL - Too many OPEN CURSOR

When I try to train a Decision Tree Model via an APD process in RSANWB, I get a runtime error when my model is configured with too many parameter fields or too many leaves (with 2 leaves it works, with more it fails).
By searching SAP Notes I see that there are many references to this kind of runtime errors. But no note on occurences of it in RSANWB / RSDMWB .
Any information on this anyone?
Claudio Ciardelli
Runtime Errors         DBIF_RSQL_INVALID_RSQL
Date and Time          29.07.2005 16:19:21
|ShrtText                                                                                |
|    Error in RSQL module of database interface.                                                   |
|What happened?                                                                                |
|    Error in ABAP application program.                                                            |
|                                                                                |
|    The current ABAP program "SAPLRS_DME_DECISION_TREE_PRED" had to be terminated                 |
|     because one of the                                                                           |
|    statements could not be executed.                                                             |
|                                                                                |
|    This is probably due to an error in the ABAP program.                                         |
|                                                                                |
|Error analysis                                                                                |
|    The system attempted to open a cursor for a SELECT or OPEN CURSOR                             |
|    statement but all 16 cursors were already in use.                                             |
|    The statement that failed accesses table "/BIC/0CDT000030 ".                                  |
|    The erroneous statement accesses table "/BIC/0CDT000030 ".                                    |
|Trigger Location of Runtime Error                                                                 |
|    Program                                 SAPLRS_DME_DECISION_TREE_PRED                         |
|    Include                                 LRS_DME_DECISION_TREE_PREDU06                         |
|    Row                                     103                                                   |
|    Module type                             (FUNCTION)                                            |
|    Module Name                             RS_DME_DTP_EVALUATE                                   |
|Source Code Extract                                                                               |
|Line |SourceCde                                                                                |
|   73|* Prepare for Data evaluation                                                               |
|   74| CATCH SYSTEM-EXCEPTIONS OTHERS = 15.                                                      |
|   75|    CREATE DATA ref TYPE (i_enum_dbtab).                                                    |
|   76|    ASSIGN ref->* TO <fs_wkarea>.                                                           |
|   77|    ASSIGN COMPONENT gv_class_dbposit OF STRUCTURE                                          |
|   78|                      <fs_wkarea> TO <fs_class>.                                            |
|   79|    CREATE DATA ref TYPE TABLE OF (i_enum_dbtab).                                           |
|   80|    ASSIGN ref->* TO <ft_data>.                                                             |
|   81|                                                                                |
|   82| ENDCATCH.                                                                                |
|   83| IF sy-subrc = 15.                                                                         |
|   84|*   Error on Assignment.                                                                    |
|   85|    CALL FUNCTION 'RS_DME_COM_ADDMSG_NOLOG'                                                 |
|   86|      EXPORTING                                                                             |
|   87|        i_type    = 'E'                                                                     |
|   88|        i_msgno   = 301                                                                     |
|   89|        i_msgv1   = 'EVALUATION_PHASE'                                                      |
|   90|      IMPORTING                                                                             |
|   91|        es_return = ls_return.                                                              |
|   92|    APPEND ls_return TO e_t_return.                                                         |
|   93|    EXIT.                                                                                |
|   94| ENDIF.                                                                                |
|   95|                                                                                |
|   96|* For the un-trained Rec-Ids, evaluate.....                                                 |
|   97| REFRESH lt_recinp.                                                                        |
|   98| APPEND LINES OF i_t_records TO lt_recinp.                                                 |
|   99| SORT lt_recinp .                                                                          |
| 100|* Open Cursor..                                                                             |
| 101| DATA: l_curs TYPE cursor.                                                                 |
| 102| DATA: l_psize TYPE i VALUE 10000.                                                         |
|>>>>>| OPEN CURSOR WITH HOLD l_curs FOR                                                          |
| 104|   SELECT * FROM (i_enum_dbtab)                                                             |
| 105|     WHERE rsdmdt_recid NOT IN                                                              |
| 106|        ( SELECT rsdmdt_recid FROM                                                          |
| 107|             (i_learn_tab) ).                                                               |
| 108|                                                                                |
| 109|* Start Fetch...                                                                           |
| 110| DO.                                                                                |
| 111|    FETCH NEXT CURSOR l_curs                                                                |
| 112|      INTO CORRESPONDING FIELDS OF TABLE <ft_data>                                          |
| 113|      PACKAGE SIZE l_psize.                                                                 |
| 114|    IF sy-subrc NE space.                                                                   |
| 115|      EXIT.                                                                                |
| 116|    ENDIF.                                                                                |
| 117|                                                                                |
| 118|*     Process records...                                                                    |
| 119|    LOOP AT <ft_data> ASSIGNING <fs_wkarea>.                                                |
| 120|                                                                                |
| 121|*     Call Prediction Function.                                                             |
| 122|      CALL FUNCTION 'RS_DME_DTP_PREDICT_STRUCTURE'                                          |

Hi Claudio,
well the message is very clear and I think in your case you need to split your model into a few somehow equal models, each not having more than 2 leaves.
Another option might be to do more things serially instead of parallel.
Hope it helps
regards
Siggi

ORA-30678: too many open connections with UTL_MAIL.send

I'm have just recently started getting the ORA-30678: too many open connections error while calling the UTL_MAIL.send procedure to send emails via a pl/sql package. The call is made within a loop and there can be a significant number of calls made to this procedure. In fact, I received this error over 1400 times within the last three days. This was previously working until I made a change to the processing which now results in a larger number of emails/calls to this procedure. I don't see any documentation on how (or if) I can close the connection with UTL_MAIL.
I'm using Oracle 11g. Any insight would be much appreciated.
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Looks like a bug possibly, check out this MOS Note:
Ora-30678: Too Many Open Connections From UTL_MAIL [ID 788442.1]
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Photoshop CS6 creates too many History States withing 1 stroke

I'm on MAC OSX 10.6.8, Photoshop CS6, using a Wacom Cintiq 12".
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Although this is sometimes useful, if you work on really long strokes, but mostly it's highly disturbing, as after using just one tool to paint only one little circle, I loose all my other, much more important History states.
Can somebody explain to me why???

Noel Carboni wrote:
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Hmmm... could be, but I don't know how to test it, as it happens occasionally... I don't experience it in other software, but I will keep an eye on that.

Too many PINs associated with my BB ID

Dear BB Support,
I bought a new BlackBerry Z10 today and tried to download apps. Unfortunately my BlackBerry ID is connected to too many PINs. Can you help me delete the old PINs and just connect me current PIN to my account so I can download my apps?
Help appreciated.
Best,
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Your carrier should be able to handle that for you. That's related to an account, which we can't control from here; we can only advise on issues.
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Too many open cursors

Could someone help me understand this problem, and how to remedy it? We're getting warnings as the number of open cursors nears 1200. I've located the V$OPEN_CURSOR view, and after investigating it, this is what I think:
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SQL> select count(*)
2 from v$open_cursor;
COUNT(*)
535
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SQL> ed
Wrote file afiedt.buf
1 SELECT COUNT(*), SUM(cnt)
2 FROM (SELECT hash_value,
3 sql_id,
4 COUNT(*) as cnt
5 FROM v$open_cursor
6 GROUP BY hash_value, sql_id
7* HAVING COUNT(*) > 1)
SQL> /
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104 314
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-Chuck

CURSOR_SHARING=EXACT
OPEN_CURSORS=500
CURSOR_SHARING
From what I've read, cursor sharing is always in effect, although we have the most conservative method set. So I'm not sure how this affects things. Several identical queries are being submitted in several separate cursors.
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This value corresponds with the maximum number of cursors allowed for a single session. We're using shared servers, so I'm exactly sure if this is still 'per session' or 'per shared server', but 500 should be more than enough.
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Hi All,
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Look at the following:
SQL> begin
2          raise no_data_found;
3 end;
4 /
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2          raise no_data_found;
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4          raise_application_error(
5                  -20000,
6                  'oh damn some error happened. the error is '||SQLERRM
7          );
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Using Kodo4.1.4 with Oracle10, and Large Result Set Proxies, I encountered
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// This code pattern is called hundreds of times
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variable, and then store the script into a SSIS package variable. After that, we create a staging table based on the package variable, load the flat file data to the staging table. Eventually, we load data from the staging table to the destination table. For
the detail steps, please walk through the following blog:
http://www.citagus.com/citagus/blog/importing-from-flat-file-with-dynamic-columns/
Regards,
Mike Yin
TechNet Community Support

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