Prallel query and Delete statements

Hi Gurus, need your help in understanding parallel execution
We are noticing that delete statements are executing very slowly when parallel query is forced. Is this expected?
All the literature that I read says that parallel query has no impact on DML statements. Yet, the query plan on the delete statement shows that it will be executed in parallel mode. This could mean that the scan portion is happening in parallel but the delete operation itself is happening in serial, correct?
I tested in various servers and multiple tables before posting my question here. They all seem to show consistent results. Delete statements are twice slower when parallel query is forced. The same happens when parallel degree is set in table definition.
For your information, we are running 10g on windows server with 15 million rows in table, 5 million rows being deleted with the statement. There is one index on the table and it doesn’t match the columns in query. Query plan shows full table scan. Table is not portioned.
Thanks for your help in advance

Parallel DML is supported by Oracle. Obviously when enabled, it can impact a DML statement.. (what literature have you read that said otherwise?)
The delete operation itself is done in parallel using rowid ranges (e.g. each PQ slave process does a distinct physical "piece" of the table).
Parallel DML should typically speed up the process. Why? Because I/O itself has latency. The process needs to wait (idle CPU time) for the I/O operation to complete before continuing.
So let's assume the process can only do a 100 deletes per second. The actual I/O channel is capable of a 1000 I/O's per second. But due to inherant latency, the "max delete speed limit" for a procces is a 100 I/O's per second. The full capacity of the I/O channel is thus not used (and cannot be used by a single process).
Parallel Query enables more processes to do I/O in order to utilise this "max speed limit".
Why would you see a degradation in performance? It could be due to overutilising the I/O channels (attempting to go faster than the speed limit so to say).
It could be due to some other contention in Oracle or even the o/s. You will need to investigate the wait state and events of the PQ processes to try and determine the probable cause.

Similar Messages

Searching update insert and delete statements

Hi.
Suppose, there is change request containing 10 or more programs.
One of the program has statements, working with database tables,
like update, insert or delete.
Is there any transaction where we can select request number and find
programs working with tables directly.

Hello
1. Goto table E071 with TRKORR = change request and OBJECT = {reps, repo, rept}
2. In field OBJ_NAME will be all reports names in this request
3. In abap-programm upload this reports into internal table
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Script for handling triggers and delete statements

Hello,
currently I'm facing a problem which I don't know how to deal with.
We need a script which deletes/disables two triggers first, then delete some data and afterwards create/enable the triggers again.
I didn't find a proper hint how to cover this with dbmcli, probably we have to use a "higher" language..?!?!
Is it possible at all to provide "dbmcli -i" with a file including sql statements like the example afterwards ?
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disable/drop trigger trig_b
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delete from b where...
enable/create trigger trig_a...
enable/create trigger trig_b...
used maxDB version is 7.5.0.38
any hint appreciated....GERD.....

Hi Gerd,
please be aware that DBMCLI is a DBMServer client, not a SQL client (although it can tunnel some sql through the DBMServer).
Better use SQLCLI for things like that.
And. no, you cannot switch triggers on and off - just drop and recreate them.
But you may specify the IGNORE TRIGGER keyword for the delete statements.
That way you can leave the triggers just as they are.
p.s.
Any reason to stay on super old 7.5 ?
regards,
Lars

SQL query and Delete the data based on condition

Hi All,
I have one requirement like I need to fetch the data from the table, In that table one filed (XXXXX) domain type is STAMP.
delete the data if the sy-datum ( length 8) is greater than field XXXXX which has length 14.
Please suggest me how to delete or fetch the data with the same length.
I have used below code..but did not work..
"Concatenate sy-datum '%' into gv_var1.
select *
from DD03l
into itab
where XXXX like gv_var1."
and tried this one as well
1. DELETE itab WHERE XXXXX GT sy-datum.
2. DELETE itab WHERE XXXXX GT gv_var1.

Hi,
When dates are in different formats you have to always convert them into one common format and then do the checks. Its better to convert the date in the variable into timestamp(using CONVERT DATE statement-look for abapdocu for its usage) and then compare it with the date on database.
data: gv_var1 TYPE timestamp.
convert date sy-datum into time stamp gv_var1.
select *
from DD03l
into itab
where XXXX like gv_var1.
should work now.
Hope this helps.
Shwetha

Select query and Insert statement performance

Hi all,
Can anyone plz guide us on below problem I am facing ?
1) One of the simple Insert statement runs very slow..What might be the reason? Its simple table without any LOBs ,LONG or so. Everything else in the DB works fine.
2) one of the SELECT statement runs very slow. It selects all records (around 1000) from a table..How can i improve its performance?
3)Which columns in the Master and its detail tables should be indexed to improve Query performance on them.
Many Thanks
Regards
sandeep

To get an answer to your questions you have to post some informations about your system:
1. operating system
2. RAM
3. oracle version
4. init.ora
Thomas

How to query and revoke Statements Auditing (11g and higher)

HI,
When I choose the OS/XML Standard Auditing:
1) Which views allow me to see what statement auditing have been created?
For instance: audit all on scott.emp by access.
2) How to revoke a statement auditing like: audit all on scott by access?
Thanks and Regards.

I don't understand... have you tried it?
07:14:57 SQL> select * from user_obj_audit_opts;
no rows selected
Elapsed: 00:00:00.03
07:14:58 SQL> audit all on junk by access;
Audit succeeded.
Elapsed: 00:00:00.03
07:15:12 SQL> select * from user_obj_audit_opts;
OBJECT_NAME                    OBJECT_TYPE             ALT       AUD       COM       DEL       GRA       IND       INS       LOC       REN       SEL       UPD       REF EXE       CRE       REA
WRI       FBK
JUNK                           TABLE                   A/A       A/A       A/A       A/A       A/A       A/A       A/A       A/A       A/A       A/A       A/A       -/- -/-       -/-       -/-
-/-       A/A
1 row selected.
Elapsed: 00:00:00.12
07:16:46 SQL> noaudit all on junk;
Noaudit succeeded.
Elapsed: 00:00:00.03
07:16:56 SQL> select * from user_obj_audit_opts;
no rows selected
Elapsed: 00:00:00.02
07:17:03 SQL>
'ALL' is a shortcut for naming all of the relevant options: ALTER, SELECT, DELETE, etc.

Dynamic Query and Collect Statement.

Hi Gurus....
Please explain me how to write dynamic Query,,, Pl. give me with example.
Also would like to know basics of Collect statement and it's use..
Thanks
Ritesh

Hi Ritesh,
COLLECT is used to create unique or compressed datsets. The key fields are the default key fields of the internal table itab . If all non-numeric fields are same in the internal table then it will add numeric fields and maintains a single entry
If you use only COLLECT to fill an internal table, COLLECT makes sure that the internal table does not contain two entries with the same default key fields.
Check this link to know about COLLECT statement
http://www.sts.tu-harburg.de/teaching/sap_r3/ABAP4/collect.htm
Dynamic query can be built in SAP with the help of () values.
DATA:
V_TABNAME TYPE DDO2L-TABNAME,
V_CONDTION TYPE STRING.
V_TABNAME = 'MARA'.
V_CONDTION = 'MATNR LIKE 'S*'.
SELECT MATNR
FROM <b>(V_TABNAME)</b>
INTO TABLE ITAB
WHERE <b>(V_CONDTION)</b>.
Thanks,
Vinay

Help with MYSQLi Query and WHILE statement

Hi,
Not sure what is wrong here but the same record is printed in the while loop 11 times (the amount of records in the table).
<?php
//Main Connection & Query
//Database Connection & Error
$con_host = 'X';
$con_username = 'X';
$con_password = 'X';
$con_database = 'X';
$con = mysqli_connect($con_host, $con_username, $con_password, $con_database);
?>
<?php
//Query
$sql = "SELECT * FROM equipment ORDER BY name ASC";
$query = mysqli_query($con, $sql);
$row = mysqli_fetch_assoc($query);
$row_count = mysqli_num_rows($query);
//Create Variables
$name = $row['name'];
$size = $row['size'];
$quantity = $row['quantity'];
$protection = $row['protection'];
$location = $row['location'];
$sublocation = $row['sublocation'];
$bc = $row['BC'];
$id = $row['id'];
?>
<!doctype html>
<html>
<link href="stylesheets/main_stylesheet.css" rel="stylesheet" type="text/css">
<link href='http://fonts.googleapis.com/css?family=Slabo+27px' rel='stylesheet' type='text/css'>

<link rel="shortcut icon" type="image/png" href="images/icon.png" />
<style type="text/css">
</style>
<head>
<meta charset="utf-8">
<title>Print Equipment List</title>
<link href="stylesheets/print_stylesheet.css" rel="stylesheet" type="text/css">
<script src="sorttable.js"></script>

</head>
<body>
<div class="print_button no-print" onClick="window.print()">Print</div>
<div class="print_text no-print">Select the sorting of the list by clicking on the table categories and click the print button below</div>
<div class="print_a4page">
<div class="print_header">
     <div class="print_header_logo"><img src="images/logo.png" width="306" height="43"></div>
      <div class="print_header_text" id="header_text">Drama Database</div>
      <div class="print_header_info">List printed: <script type="text/javascript">
var currentTime = new Date();
var month = currentTime.getMonth() + 1;
var day = currentTime.getDate();
var year = currentTime.getFullYear();
document.write(day + "/" + month + "/" + year);</script>
<br>
Total records:
<?php echo $row_count ?></div>
</div>
    <div class="print_header_divider">Equipment List</div>
    <div class="print_body">
      <div>
        <form name="users" method="post">
          <div class="table_print">
          <table width="100%" border="0" cellpadding="5" class="sortable">
            <tr class="table_header_print">
              <th width="15%" scope="col">Name</th>
              <th width="12%" scope="col">Size</th>
              <th width="9%" scope="col">Quantity</th>
              <th width="12%" scope="col">Protection</th>
              <th width="17%" scope="col">Location</th>
              <th width="12%" scope="col">Sublocation</th>
              <th width="11%" scope="col">Barcode</th>
              <th width="12%" scope="col">Internal ID</th>
            </tr>
            <?php do { ?>
            <tr class="table_body">
              <td><?php echo $name ?></td>
              <td><?php echo $size ?></td>
              <td><?php echo $quantity ?></td>
              <td><?php echo $protection ?></td>
              <td><?php echo $location ?></td>
              <td><?php echo $sublocation ?></td>
              <td><?php echo $bc ?></td>
              <td><?php echo $id ?></td>
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            <?php } while ($row = mysqli_fetch_assoc($query));?>
          </table>
        </form>
      </div>
    </div>
</div>
</body>
</html>

Still getting the same issue.
As I see it, the way you have suggested is just rearanging things right?
here is a screenshot of the outcome:
And here is the improved code:
<?php
//Main Connection & Query
//Database Connection & Error
$con_host = 'X';
$con_username = 'X';
$con_password = 'X';
$con_database = 'X';
$con = new mysqli($con_host, $con_username, $con_password, $con_database);
?>
<?php
//Query
$sql = "SELECT * FROM equipment ORDER BY name ASC";
$result = $con->query($sql);
$row = $result->fetch_assoc();
$row_count = $result->num_rows;
//Create Variables
$name = $row['name'];
$size = $row['size'];
$quantity = $row['quantity'];
$protection = $row['protection'];
$location = $row['location'];
$sublocation = $row['sublocation'];
$bc = $row['BC'];
$id = $row['id'];
?>
<!doctype html>
<html>
<link href="stylesheets/main_stylesheet.css" rel="stylesheet" type="text/css">
<link href='http://fonts.googleapis.com/css?family=Slabo+27px' rel='stylesheet' type='text/css'>

<link rel="shortcut icon" type="image/png" href="images/icon.png" />
<style type="text/css">
</style>
<head>
<meta charset="utf-8">
<title>Print Equipment List</title>
<link href="stylesheets/print_stylesheet.css" rel="stylesheet" type="text/css">
<script src="sorttable.js"></script>

</head>
<body>
<div class="print_button no-print" onClick="window.print()">Print</div>
<div class="print_text no-print">Select the sorting of the list by clicking on the table categories and click the print button below</div>
<div class="print_a4page">
<div class="print_header">
     <div class="print_header_logo"><img src="images/logo.png" width="306" height="43"></div>
      <div class="print_header_text" id="header_text">Drama Database</div>
      <div class="print_header_info">List printed: <script type="text/javascript">
var currentTime = new Date();
var month = currentTime.getMonth() + 1;
var day = currentTime.getDate();
var year = currentTime.getFullYear();
document.write(day + "/" + month + "/" + year);</script>
<br>
Total records:
<?php echo $row_count ?></div>
</div>
    <div class="print_header_divider">Equipment List</div>
    <div class="print_body">
      <div>
        <form name="users" method="post">
          <div class="table_print">
          <table width="100%" border="0" cellpadding="5" class="sortable">
            <tr class="table_header_print">
              <th width="15%" scope="col">Name</th>
              <th width="12%" scope="col">Size</th>
              <th width="9%" scope="col">Quantity</th>
              <th width="12%" scope="col">Protection</th>
              <th width="17%" scope="col">Location</th>
              <th width="12%" scope="col">Sublocation</th>
              <th width="11%" scope="col">Barcode</th>
              <th width="12%" scope="col">Internal ID</th>
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            <?php while ($row = $result->fetch_assoc()) { ?>
            <tr class="table_body">
              <td><?php echo $name ?></td>
              <td><?php echo $size ?></td>
              <td><?php echo $quantity ?></td>
              <td><?php echo $protection ?></td>
              <td><?php echo $location ?></td>
              <td><?php echo $sublocation ?></td>
              <td><?php echo $bc ?></td>
              <td><?php echo $id ?></td>
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</div>
</body>
</html>

Dynamic query for delete statement

Hi friends,
I have a table hierarchy where suppose i have tables with following hierarchy
Level1
level2 (child of level1)
level3 (child of level2)
level4 (child of level3)
Now i want to delete data from lowest level table depending on level one table value which is provided to me.
I have a requirement where i want to create this delete query dynamically.
Any help in this concern...
Thanks,
Sachin

Yon can use on delete cascade as satyaki suggested like
SQL> select * from level1;
        ID DESCRIPTION
         1 L1_1
         2 L1_2
         4 L1_3
         5 L1_4
4 rows selected.
SQL> select * from level2;
        ID DESCRIPTION                                                                                           L1_FK
         1 L2_1                                                                                                  1
         2 L2_2                                                                                                  1
         4 L2_3                                                                                                  2
         5 L2_4                                                                                                  2
4 rows selected.
SQL> delete from level1 where id =1;
1 row deleted.
SQL> select * from level1;
        ID DESCRIPTION
         2 L1_2
         4 L1_3
         5 L1_4
3 rows selected.
SQL> select * from level2;
        ID DESCRIPTION                                                                                           L1_FK
         4 L2_3                                                                                                  2
         5 L2_4                                                                                                  2
2 rows selected.
SQL>

Updating and deleting records in access DB

i'm trying to make multiple updates and deletes in a access DB and it doesn't work.
my program executes lot's of updates and delete statements when saving, but I only commit in the end when I know all the statements finished ok.
I can't make it a batch update since I need to retrieve the auto-number that access issues me on some of my tables.
I know it's kinda fuzzy, but my program is SO big already, and I can't really put the code in here - it wouldn't do much good.
what I will do is write what my log shows (i issue a log output whenever there's a executeQuery/Update and before commit/rollback
DBG : 29/04/03 : UPDATE CASES_T SET CASE_office_case_id = 1 ,CASE_year = 2 ,CASE_total_debt = 10009 ,CASE_is_limited = true ,CASE_monthly_payment = 400 ,CASE_hotzlap_case_id = ' - - - ' ,CASE_status = 26 WHERE CASE_tech_id = 5
DBG : 29/04/03 : SELECT count(*) from CASES_OWEES_T where CAOW_Tech_Id = 23
DBG : 29/04/03 : UPDATE CASES_OWEES_T SET CAOW_case_tech_id = 5 ,CAOW_id_number = '046259990' ,CAOW_first_name = '��' ,CAOW_last_name = '��' ,CAOW_work_place = 'jjjjjjjjjjjjj' ,CAOW_address = '1jjjjjjjjjjjj' ,CAOW_telephone = '09-8099999' ,CAOW_pelephone = '000-000000' ,CAOW_hotzlap_case_id = ' - - - ' ,CAOW_is_valid_address = false WHERE CAOW_TECH_ID = 23
DBG : 29/04/03 : SELECT count(*) from CASES_OWEES_T where CAOW_Tech_Id = 24
DBG : 29/04/03 : UPDATE CASES_OWEES_T SET CAOW_case_tech_id = 5 ,CAOW_id_number = ' ' ,CAOW_first_name = '��' ,CAOW_last_name = '��' ,CAOW_work_place = '��' ,CAOW_address = '��?' ,CAOW_telephone = ' - ' ,CAOW_pelephone = ' - ' ,CAOW_hotzlap_case_id = ' - - - ' ,CAOW_is_valid_address = true WHERE CAOW_TECH_ID = 24
DBG : 29/04/03 : SELECT count(*) from CASES_INNER_CASES_T where CICA_Tech_Id = 10
DBG : 29/04/03 : UPDATE CASES_INNER_CASES_T SET CICA_case_tech_id = 5 ,CICA_debt = 5000897 ,CICA_winner_name = '��' ,CICA_lawyer_tech_id = '6' ,CICA_hotzlap_case_id= '02-22122-22-2' WHERE CICA_tech_id= 10
DBG : 29/04/03 : SELECT count(*) from CASES_INNER_CASES_T where CICA_Tech_Id = 11
DBG : 29/04/03 : UPDATE CASES_INNER_CASES_T SET CICA_case_tech_id = 5 ,CICA_debt = 20008 ,CICA_winner_name = '��' ,CICA_lawyer_tech_id = '2' ,CICA_hotzlap_case_id= '02-22222-22-2' WHERE CICA_tech_id= 11
DBG : 29/04/03 : SELECT count(*) from CASES_INNER_CASES_T where CICA_Tech_Id = 14
DBG : 29/04/03 : UPDATE CASES_INNER_CASES_T SET CICA_case_tech_id = 5 ,CICA_debt = 129 ,CICA_winner_name = '' ,CICA_lawyer_tech_id = '4' ,CICA_hotzlap_case_id= '02-22222-22-2' WHERE CICA_tech_id= 14
DBG : 29/04/03 : SELECT count(*) from CASES_CUSTOMER_CARDS_T where CUCA_Tech_Id = 23
DBG : 29/04/03 : UPDATE CASES_CUSTOMER_CARDS_T SET CUCA_case_tech_id = 5 , CUCA_sum = 324 , CUCA_fee_plus_maam = -38.0 , CUCA_for_division = 285.0 , CUCA_voucher = '3222 ' , CUCA_date = '2003-04-24' , CUCA_in_or_out = true WHERE CUCA_tech_id = 23
DBG : 29/04/03 : SELECT count(*) from CASES_CUSTOMER_CARDS_T where CUCA_Tech_Id = 22
DBG : 29/04/03 : UPDATE CASES_CUSTOMER_CARDS_T SET CUCA_case_tech_id = 5 , CUCA_sum = 324 , CUCA_fee_plus_maam = -38.0 , CUCA_for_division = 285.0 , CUCA_voucher = '2222 ' , CUCA_date = '2003-04-23' , CUCA_in_or_out = true WHERE CUCA_tech_id = 22
DBG : 29/04/03 : SELECT count(*) from CASES_CUSTOMER_CARDS_T where CUCA_Tech_Id = 21
DBG : 29/04/03 : UPDATE CASES_CUSTOMER_CARDS_T SET CUCA_case_tech_id = 5 , CUCA_sum = 100 , CUCA_fee_plus_maam = -11.0 , CUCA_for_division = 0.0 , CUCA_voucher = '2222 ' , CUCA_date = '2003-04-23' , CUCA_in_or_out = true WHERE CUCA_tech_id = 21
DBG : 29/04/03 : SELECT count(*) from CASES_CUSTOMER_CARDS_T where CUCA_Tech_Id = 20
DBG : 29/04/03 : UPDATE CASES_CUSTOMER_CARDS_T SET CUCA_case_tech_id = 5 , CUCA_sum = 1000 , CUCA_fee_plus_maam = -118.0 , CUCA_for_division = 882.0 , CUCA_voucher = '1111 ' , CUCA_date = '2003-04-23' , CUCA_in_or_out = true WHERE CUCA_tech_id = 20
DBG : 29/04/03 : SELECT count(*) from CASES_INVESTIGATIONS_T where CAIN_Tech_Id = 16
DBG : 29/04/03 : UPDATE CASES_INVESTIGATIONS_T SET CAIN_case_tech_id = 5 ,CAIN_text = '' ,CAIN_was_declared_limited = false ,CAIN_date = '2003-03-01' ,CAIN_rulling_effective_date = '2003-02-01' ,CAIN_payment_amount = 400 WHERE CAIN_TECH_ID = 16
DBG : 29/04/03 : SELECT count(*) from CASES_INVESTIGATIONS_T where CAIN_Tech_Id = 12
DBG : 29/04/03 : UPDATE CASES_INVESTIGATIONS_T SET CAIN_case_tech_id = 5 ,CAIN_text = '' ,CAIN_was_declared_limited = true ,CAIN_date = '1970-01-01' ,CAIN_rulling_effective_date = '1905-03-06' ,CAIN_payment_amount = 90 WHERE CAIN_TECH_ID = 12
DBG : 29/04/03 : SELECT count(*) from CASES_INVESTIGATIONS_T where CAIN_Tech_Id = 10
DBG : 29/04/03 : UPDATE CASES_INVESTIGATIONS_T SET CAIN_case_tech_id = 5 ,CAIN_text = '' ,CAIN_was_declared_limited = false ,CAIN_date = '1970-01-01' ,CAIN_rulling_effective_date = '1990-01-30' ,CAIN_payment_amount = 89 WHERE CAIN_TECH_ID = 10
DBG : 29/04/03 : DELETE FROM CASES_INVESTIGATIONS_T where CAIN_tech_id = 9
DBG : 29/04/03 : DELETE FROM CASES_INVESTIGATIONS_T where CAIN_tech_id = 9
DBG : 29/04/03 : DELETE FROM CASES_INVESTIGATIONS_T where CAIN_tech_id = 14
DBG : 29/04/03 : DELETE FROM CASES_INVESTIGATIONS_T where CAIN_tech_id = 14
DBG : 29/04/03 : DELETE FROM CASES_INVESTIGATIONS_T where CAIN_tech_id = 13
DBG : 29/04/03 : DELETE FROM CASES_INVESTIGATIONS_T where CAIN_tech_id = 13
DBG : 29/04/03 : DELETE FROM CASES_INVESTIGATIONS_T where CAIN_tech_id = 11
DBG : 29/04/03 : DELETE FROM CASES_INVESTIGATIONS_T where CAIN_tech_id = 11
DBG : 29/04/03 : SELECT count(*) from CASES_PAYMENTS_T where CAPY_Tech_Id = 71
DBG : 29/04/03 : UPDATE CASES_PAYMENTS_T SET CAPY_case_tech_id = 5 ,CAPY_sum = 400 ,CAPY_exception_text = '' ,CAPY_is_exception = true ,CAPY_voucher = '' ,CAPY_date = '2003-04-01' ,CAPY_is_paid_in_hotzlap = false WHERE CAPY_TECH_ID = 71
DBG : 29/04/03 : SELECT count(*) from CASES_PAYMENTS_T where CAPY_Tech_Id = 70
DBG : 29/04/03 : UPDATE CASES_PAYMENTS_T SET CAPY_case_tech_id = 5 ,CAPY_sum = 400 ,CAPY_exception_text = '' ,CAPY_is_exception = true ,CAPY_voucher = '' ,CAPY_date = '2003-03-01' ,CAPY_is_paid_in_hotzlap = false WHERE CAPY_TECH_ID = 70
DBG : 29/04/03 : SELECT count(*) from CASES_PAYMENTS_T where CAPY_Tech_Id = 69
DBG : 29/04/03 : UPDATE CASES_PAYMENTS_T SET CAPY_case_tech_id = 5 ,CAPY_sum = 400 ,CAPY_exception_text = '' ,CAPY_is_exception = true ,CAPY_voucher = '' ,CAPY_date = '2003-03-01' ,CAPY_is_paid_in_hotzlap = false WHERE CAPY_TECH_ID = 69
DEV : 29/04/03 : commit

sure - I don't get any exception. the data just
doesn't show in the DB. (no updating/deletion of
records)
as I wrote before - when the the programm commits the
changes and does the next select command it seems as
if the data was changed/deleted but if I check the DB
with access or if I restart the prgoram then I see
that the data didn't change.
Access/jdbc-odbc has a problem where modifications are not 'commited' when the statement completes. Instead one must do one of the following:
1. Explicit commit.
2. Simple select after statement.
3. Close the connection.
Presumably you are doing 1.
Since other than this it does work, it suggests one of the following.
1. Something is wrong with your environment. For instance you are looking at the wrong database. Or not refreshing. Or something else like that.
2. You are using something besides a simple connection - like opening it with 'scroll insensitive'.
3. The complexity is causing it to lose an error message. This can be tested by doing each statement individually and verify that none produce an error.
4. Maybe you found a bug. You can turn on ODBC tracing via the applet panel and see if digging through all of the detail provides any clues (you can also do this with 3 above.)

Trace all selects, updates, and deletes

I have a compiled application that is making calls to an Oracle database (8.1.7). I don't have access to the source code for the program, so I'd like to trace all SELECT, UDPATE, and DELETE statements that it makes... something in the application is crashing because of bad data and I'd like to figure out what it is.
Is there something I can add to the init.ora file to turn on tracing for all sessions? Thanks!
--Frank

In the init<SID>.ora file, set SQL_TRACE to TRUE, TIMED_STATISTICS to FALSE, MAX_DUMP_FILE_SIZE to 500 and USER_DUMP_DEST to the directory where you want to store the trace files.
You can also proceed like this:
create or replace trigger trg$trace
after logon on database
begin
DBMS_SESSION.SET_SQL_TRACE (TRUE);
end trg$trace;
I have a compiled application that is making calls to an Oracle database (8.1.7). I don't have access to the source code for the program, so I'd like to trace all SELECT, UDPATE, and DELETE statements that it makes... something in the application is crashing because of bad data and I'd like to figure out what it is.
Is there something I can add to the init.ora file to turn on tracing for all sessions? Thanks!
--Frank

Access Code - DELETE Statement with DISTINCTROW and T-SQL

All,
I'm trying to rewrite Access Code to T-SQL Code. I understand how DISTINCTROW works in a SELECT statement but I'm not sure of the same in a DELETE statement.
Any ideas?
DELETE DISTINCTROW Order_detail.*
FROM Order_Master
INNER JOIN Order_detail
ON (Order_Master.OrderID = Order_detail.OrderID)
AND (Order_Master.OrderPartID = Order_detail.OrderPartID)
Thanks,
MS

Could we use this syntax to delete records of two tables in same query ?
DELETE DISTINCTROW TableA.*, TableB.* FROM
TableA INNER JOIN TableB ON TableA.Name = TableB.Name
No. You can delete only one table at a time.
If you are using SQL Server 2012, you can try Merge:
create table a (id int, name varchar(10))
insert into a values (1,'aName'), (2,'ABCName'), (3,'BBBName')
create table b(id int, name varchar(10))
insert into b values (1,'bName'), (2,'ABCName'), (3,'BBBName')
declare @t table ( name varchar(10))
Merge a as tgt
using b as src On tgt.name =src.name
When matched then
Delete
Output deleted.name into @t;
delete from b Where name in (select name from @t)
Select * from a
select * from b
drop table a,b

Adding update and delete buttons to a Report from SQL Query

There is an option when creating a QBE to add update and delete
links which i find quite useful, but this option doesn't seem to
be possible on a Report from SQL Query. Do i need to do
something special to add them? is the option located in a
different place?

Hi,
You can only add Update ,Delete in QBE Reports,
there is no option in Portal which can be used to
have these buttons in the Reports from Query Wizard or
Report from SQL Query.
Thanks
Vineet

Converting a delete statement using VPD policies and context

Hello,
I'm trying to convert a delete statement in a update statement using VPD policies and context.
+/* Supose the user 'user1' already exists. This is an application user */+
conn user1/pwd
create table user1.test_a (
id                number(4),
description       varchar2(100),
deleted           number(1)
+);+
alter table user1.test_a add constraint test_a_pk primary key (id);
insert into user1.test_a (1, 'abc', 0);
insert into user1.test_a (2, 'def', 0);
commit;
I'd like to convert each physical deletion into a logical deletion: statements like "delete from user1.test_a where id = 1" must be converted into "update user1.test_a set deleted = 1 where id = 1".
I've found the following way: I will create a policy to avoid physical deletion. Additionally, the policy function should update the deletion flag too.
conn user1/pwd
+/* Create context package */+
create or replace package user1.pkg_security_context is
procedure p_set_ctx(
i_test_a_id      in   user1.test_a.id   %type
+);+
end;
+/+
create or replace package body user1.pkg_security_context is
procedure p_set_ctx (
i_test_a_id      in   user1.test_a.id   %type
+) is+
begin
dbms_session.set_context( 'user1_ctx', 'test_a_id', i_test_a_id );
end;
end;
+/+
show errors
+/* Create trigger to set the context before deletion */+
create or replace trigger user1.test_a_bef_trg
before delete on user1.test_a
for each row
declare
pragma autonomous_transaction;
begin
-- only commits the preceding update, not the delete that fired the trigger.
commit;
user1.pkg_security_context.p_set_ctx( :old.id );
end;
+/+
show errors
create context user1_ctx using user1.pkg_security_context;
+/* Policy function */+
create or replace function user1.f_policy_chk_dels (
object_schema in   varchar2,
object_name   in   varchar2
+) return varchar2+
is
out_string                 varchar2(400)   default '1=2 ';
+/*+
* out_string is the return value.
* - 'WHERE 1=2' means 'nothing to access'
begin
if ( loc_logged_usr_authorized > 0 ) then
+/*+
* Set the flag deleted to 1
update user1.test_a set deleted = 1 where id = sys_context( 'user1_ctx', 'test_a_id' );
out_string := out_string || 'or 1=1 ';
end if;
return out_string;
end;
+/+
show errors
+/*+
* Create policy
begin
dbms_rls.add_policy(
object_schema   => 'user1'                   ,
object_name     => 'test_a'                  ,
policy_name     => 'policy_chk_dels'         ,
function_schema => 'user1'                   , -- function schema
policy_function => 'f_policy_chk_dels'       , -- policy function
statement_types => 'DELETE'
+);+
end;
+/+
When I try to delete a record of the table test_a:
conn user1/pwd
SQL> delete from ilogdia.oplsimulaciones sim       where sim.id = 9999;
+0 rows deleted+
No rows has been deleted, but the update stmt does not work. That means, the "deleted" flag has not been updated.
Any ideas?
Thank you in advance.
Marco A. Serrano
Edited by: albrotar on Oct 15, 2012 8:42 AM
Edited by: albrotar on Oct 15, 2012 8:42 AM
Edited by: albrotar on Oct 15, 2012 8:43 AM

The policy function is applied once per statement execution. The policy function executes first and the UPDATE statement, presumably, updates no rows because the context is not yet populated. The row-level populates the context (I'm assuming that your session can even see context values populated by an autonomous transaction-- I would guess it could but I'd have to test that) after the UPDATE statement is already complete. The COMMIT in the row-level trigger is also pointless-- it only applies to changes made by the current autonomous transaction, of which there are none-- it cannot apply to changes made in other autonomous transactions. Declaring the row-level trigger to use autonomous transactions doesn't seem to accomplish anything other than to open the question of whether the values set in the context by the autonomous transaction are visible in the caller's transaction.
Even if this, somehow, did work, using autonomous transactions would be a very bad idea since Oracle is free to roll-back a partially executed statement (and the work done by its triggers) and re-execute it. Oracle does that with some regularity to maintain write consistency.
Justin

Find technical name of query if only internal is given (and delete it)

Hello,
a query has a readable name like "Invoice for north pole customers", a technical name like "Z_MM_CUST_NPOLE" and an generated internal name like "4BUI9VVDT8A057L8G3BQ4IN4G".
When I search which queries belong to an old multiprovider, I only get the internal query names like "4BUI9VVDT8A057L8G3BQ4IN4G". I cannot search with this internal name in the BEx Query Designer nor can I search there using the InfoArea folder (I can only find one query instead of two queries).
How do I find the technical name like "Z_MM_CUST_NPOLE"?
Apart from that, I cannot delete the query in the BEx Query Designer ("Delete" is inacitve (gray)).
The query seems corrupt. Can I delete a query in the SAP GUI (rsa1 or something like this)?
Best regards
Thomas

Hi Thomas,
You can delete the Query in BIW GUI by using T Code RSZDELETE.
After that u get a screen where u enter the
Type :- REP
Object Version :-A
Technical Name as :-"The Tech name of the Query"
Leave the other Rows Blank.
Rgds
SVU123
Edited by: svu123 on Apr 3, 2009 1:07 PM

Prallel query and Delete statements

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