Deleting Multiple Rows From Multiple Tables As an APEX Process
Hi There,
I'm interesting in hearing best practice approaches for deleting multiple rows from multiple tables from a single button click in an APEX application. I'm using 3.0.1.008
On my APEX page I have a Select list displaying all the Payments made and a user can view individual payments by selecting a Payment from the Select List (individual items are displayed below using Text Field (Disabled, saves state) items with a source of Database Column).
A Payment is to be deleted by selecting a custom image (Delete Payments Button) displayed in a Vertical Images List on the same page. The Target is set as the same page and I gave the Request a name of DELETEPAY.
What I tried to implement was creating a Conditional Process On Submit - After Computations and Validations that has a source of a PL/SQL anonymous block as follows:
BEGIN
UPDATE tblDebitNotes d
SET d.Paid = 0
WHERE 1=1
AND d.DebitNoteID = :P7_DEBITNOTEID;
INSERT INTO tblDeletedPayments
( PaymentID,
DebitNoteID,
Amount,
Date_A,
SupplierRef,
Description
VALUES
( :P7_PAYMENTID,
:P7_DEBITNOTEID,
:P7_PAID,
SYSDATE,
:P7_SUPPLIERREF,
:P7_DESCRIPTION
DELETE FROM tblPayments
WHERE 1=1
AND PaymentID = :P7_PAYMENTID;
END;
The Condition Type used was Request = Expression 1 where Expression 1 had a value of DELETEPAY
However this process is not doing anything!! Any insights greatly appreciated.
Many thanks,
Gary.
...the "button" is using a page level Target,...
I'm not sure what that means. If the target is specified in the definition of a list item, then clicking on the image will simply redirect to that URL. You must cause the page to be submitted instead, perhaps by making the URL a reference to the javaScript doSubmit function that is part of the standard library shipped with Application Express. Take a look at a Standard Tab on a sample application and see how it submits the page using doSubmit() and emulate that.
Scott
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Assume we have table called emp.
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1111------------------011-------------8181--------------04/10/1999
1111------------------011-------------8181--------------04/10/2004
2222------------------011-------------3131--------------05/11/2005
3333-----------------022-------------8181--------------06/09/2001
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My explain reads as follows.
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
| 0 | DELETE STATEMENT | | | | 1 (100)| |
| 1 | DELETE | LU_MESSAGECODE | | | | |
| 2 | INDEX UNIQUE SCAN| SYS_IOT_TOP_52662 | 1 | 133 | 1 (0)| 00:00:01 |
Also in my AWR Sql Report I see this as well
Plan Statistics DB/Inst: IWORKSDB/iworksdb Snaps: 778-780
-> % Total DB Time is the Elapsed Time of the SQL statement divided
into the Total Database Time multiplied by 100
Stat Name Statement Per Execution % Snap
Elapsed Time (ms) 521,102 N/A 12.0
CPU Time (ms) 73,922 N/A 5.1
Executions 0 N/A N/A
Buffer Gets 2,892,144 N/A 3.4
Disk Reads 2,847,609 N/A 8.6
Parse Calls 1 N/A 0.0
Rows 0 N/A N/A
User I/O Wait Time (ms) 475,882 N/A N/A
Cluster Wait Time (ms) 0 N/A N/A
Application Wait Time (ms) 0 N/A N/A
Concurrency Wait Time (ms) 2 N/A N/A
Invalidations 1 N/A N/A
Version Count 1 N/A N/A
Sharable Mem(KB) 45 N/A N/A
Now, since the table only has 150 rows, and I am only try to delete 1 row, why is there so much disk read and why does it take 5 minutes to delete? This just weird. Does this have something to do with the Child tables?Any triggers on the table?
If you trace the session, what statement(s) seem to
be taking all that time?
JustinWell I traced my session and I noticed that my query does take a while, but I also noticed several other queries that I was not running. Not too sure where it came from. Have a look below. It is a sample from my TKPROF utility report.
delete gemdev.lu_messagecode
where
mess_code ='SSY'
call count cpu elapsed disk query current rows
Parse 1 0.00 0.00 0 0 0 0
Execute 1 0.01 0.04 0 2 23 1
Fetch 0 0.00 0.00 0 0 0 0
total 2 0.01 0.04 0 2 23 1
Misses in library cache during parse: 1
Optimizer mode: FIRST_ROWS
Parsing user id: 57
Rows Row Source Operation
1 DELETE LU_MESSAGECODE (cr=3446672 pr=3442028 pw=0 time=309363335 us)
1 INDEX UNIQUE SCAN SYS_IOT_TOP_52662 (cr=2 pr=0 pw=0 time=35 us)(object id 52663)
Elapsed times include waiting on following events:
Event waited on Times Max. Wait Total Waited
---------------------------------------- Waited ---------- ------------
SQL*Net message to client 1 0.00 0.00
SQL*Net message from client 1 35.87 35.87
select /*+ all_rows */ count(1)
from
"GEMDEV"."TBLCLAIMCHARGE" where "CONTRACT_FEE_MESS_CODE" = :1
call count cpu elapsed disk query current rows
Parse 1 0.00 0.00 0 0 0 0
Execute 1 0.00 0.00 0 0 0 0
Fetch 1 10.53 44.95 381779 382893 0 1
total 3 10.53 44.95 381779 382893 0 1
Misses in library cache during parse: 1
Misses in library cache during execute: 1
Optimizer mode: ALL_ROWS
Parsing user id: SYS (recursive depth: 1)
Rows Row Source Operation
1 SORT AGGREGATE (cr=382893 pr=381779 pw=0 time=44953436 us)
0 TABLE ACCESS FULL TBLCLAIMCHARGE (cr=382893 pr=381779 pw=0 time=44953403 us)
Elapsed times include waiting on following events:
Event waited on Times Max. Wait Total Waited
---------------------------------------- Waited ---------- ------------
db file scattered read 47795 0.03 37.87
db file sequential read 101 0.00 0.02
select /*+ all_rows */ count(1)
from
"GEMDEV"."TBLCLAIMCHARGE" where "FEE_INEL_MESS_CODE" = :1
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