Urgent : Performance Issue DELETE , INSERT INTO SELECT, UPDATE

Hi,
NEED ASSISTANCE TO OPTIMIZE THE INSERT STATEMENT (insert into select):
=================================================
We have a report.
As per current design following steps are used to populate the custom table whcih is used for reporting purpose:
1) DELETE all the recods from the custom table XXX_TEMP_REP.
2) INSERT records in custom table XXX_TEMP_REP (Assume all the records related to type A)
using
INSERT..... INTO..... SELECT.....
statement.
3) Update records in XXX_TEMP_REP
using some custom logic for the records populated .
4) INSERT records in custom table XXX_TEMP_REP (Records related to type B)
using
INSERT..... INTO..... SELECT.....
statement.
Stats gathered related to Insert statement are:
Event Wait Information
SID 460 is waiting on event : db file sequential read
P1 Text : file#
P1 Value : 20
P2 Text : block#
P2 Value : 435039
P3 Text : blocks
P3 Value : 1
Session Statistics
redo size : 293.84 M
parse count (hard) : 34
parse count (total) : 1217
user commits : 3
Transaction and Rollback Information
Rollback Used : 35.1796875 M
Rollback Records : 355886
Rollback Segment Number : 12
Rollback Segment Name : _SYSSMU12$
Logical IOs : 1627182
Physical IOs : 136409
RBS Startng Extent ID : 14
Transaction Start Time : 09/29/10 04:22:11
Transaction_Status : ACTIVE
Please suggest how this can be optimized.
Regards,
Narender

Hello,
Is there any relation with the Oracle Forms tool ?
Francois

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How to convert update,delete statement into select stmt

Hi all,
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Commit for every 1000 records in Insert into select statment

Hi I've the following INSERT into SELECT statement .
The SELECT statement (which has joins ) has around 6 crores fo data . I need to insert that data into another table.
Please suggest me the best way to do that .
I'm using the INSERT into SELECT statement , but i want to use commit statement for every 1000 records .
How can i achieve this ..
insert into emp_dept_master
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Smile wrote:
Hi I've the following INSERT into SELECT statement .
The SELECT statement (which has joins ) has around 6 crores fo data . I need to insert that data into another table.Does the another table already have records or its empty?
If its empty then you can drop it and create it as
create your_another_table
as
<your select statement that return 60000000 records>
Please suggest me the best way to do that .
I'm using the INSERT into SELECT statement , but i want to use commit statement for every 1000 records .That is not the best way. Frequent commit may lead to ORA-1555 error
[url http://asktom.oracle.com/pls/apex/f?p=100:11:0::::P11_QUESTION_ID:275215756923]A nice artical from ASKTOM on this one
How can i achieve this ..
insert into emp_dept_master
select e.ename ,d.dname ,e.empno ,e.empno ,e.sal
from emp e , dept d
where e.deptno = d.deptno       ------ how to use commit for every 1000 records .
It depends on the reason behind you wanting to split your transaction into small chunks. Most of the time there is no good reason for that.
If you are tying to imporve performance by doing so then you are wrong it will only degrade the performance.
To improve the performance you can use APPEND hint in insert, you can try PARALLEL DML and If you are in 11g and above you can use [url http://docs.oracle.com/cd/E11882_01/appdev.112/e25788/d_parallel_ex.htm#CHDIJACH]DBMS_PARALLEL_EXECUTE to break your insert into chunks and run it in parallel.
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A trigger that changes an insert into an update?

This is probably a quite unusual question, but is it possible to create a trigger that changes an insert into an update?
So, if someone tries to do something like this:
INSERT INTO SOME_TABLE (column1, column2, column3) VALUES (value1, value2, value3);
...the trigger is able to change it into:
UPDATE SOME_TABLE column1=value1, column2=value2, column3=value3 WHERE ID=1;
Can it be done?

Hi,
You can do things like that in an INSTEAD OF INSERT trigger.
See the PL/SQL manual for details:
http://download.oracle.com/docs/cd/B28359_01/appdev.111/b28370/create_trigger.htm#sthref2864
INSTEAD of triggers only work on views. Of course, you can create a view as "SELECT * FROM some_table" just so you can use an INSTEAD OF trigger.

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any idea do you have?
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Performance issue with insert query !

Hi ,
I am using dbxml-2.4.16, my node-storage container is loaded with a large document ( 54MB xml ).
My document basically contains around 65k records in the same table ( 65k child nodes for one parent node ). I need to insert more records in to my DB, my insert XQuery is consuming a lot of time ( ~23 sec ) to insert one entry through command-line and around 50sec through code.
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insert nodes <NS:sampleEntry mySSIAddress='70011' modifier = 'create'><NS:sampleIPZone1Address>AABBCCDD</NS:sampleIPZone1Address><NS:myICMPFlag>1</NS:myICMPFlag><NS:myIngressFilter>1</NS:myIngressFilter><NS:myReadyTimer>4</NS:myReadyTimer><NS:myAPNNetworkID>ggsntest</NS:myAPNNetworkID><NS:myVPLMNFlag>2</NS:myVPLMNFlag><NS:myDAC>100</NS:myDAC><NS:myBcastLLIFlag>2</NS:myBcastLLIFlag><NS:sampleIPZone2Address>00000000</NS:sampleIPZone2Address><NS:sampleIPZone3Address>00000000</NS:sampleIPZone3Address><NS:sampleIPZone4Address>00000000</NS:sampleIPZone4Address><NS:sampleIPZone5Address>00000000</NS:sampleIPZone5Address><NS:sampleIPZone6Address>00000000</NS:sampleIPZone6Address><NS:sampleIPZone7Address>00000000</NS:sampleIPZone7Address></NS:sampleEntry> into doc('dbxml:/n_b_i_f_c_a_z.dbxml/doc_Running-SAMPLE')//NS:NS//NS:sampleTable)
If I modify my query with
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insted of
into doc('dbxml:/n_b_i_f_c_a_z.dbxml/doc_Running-SAMPLE')//NS:NS//NS:sampleTable)
Time taken reduces only by 8 secs.
I have also tried to use insert "after", "before", "as first", "as last" , but there is no difference in performance.
Is anything wrong with my query, what should be the expected time to insert one record in a DB of 65k records.
Has anybody got any idea regarding this performance issue.
Kindly help me out.
Thanks,
Kapil.

Hi George,
Thanks for your reply.
Here is the info you requested,
dbxml> listIndexes
Index: unique-node-metadata-equality-string for node {http://www.sleepycat.com/2002/dbxml}:name
Index: node-attribute-equality-string for node {}:mySSIAddress
2 indexes found.
dbxml> info
Version: Oracle: Berkeley DB XML 2.4.16: (October 21, 2008)
Berkeley DB 4.6.21: (September 27, 2007)
Default container name: n_b_i_f_c_a_z.dbxml
Type of default container: NodeContainer
Index Nodes: on
Shell and XmlManager state:
Not transactional
Verbose: on
Query context state: LiveValues,Eager
The insery query with update takes ~32 sec ( shown below )
time query "declare namespace foo='MY-SAMPLE';declare namespace NS='NS';insert nodes <NS:sampleEntry mySSIAddress='70000' modifier = 'create' ><NS:sampleIPZone1Address>AABBCCDD</NS:sampleIPZone1Address><NS:myICMPFlag>1</NS:myICMPFlag><NS:myIngressFilter>1</NS:myIngressFilter><NS:myReadyTimer>4</NS:myReadyTimer><NS:myAPNNetworkID>ggsntest</NS:myAPNNetworkID><NS:myVPLMNFlag>2</NS:myVPLMNFlag><NS:myDAC>100</NS:myDAC><NS:myBcastLLIFlag>2</NS:myBcastLLIFlag><NS:sampleIPZone2Address>00000000</NS:sampleIPZone2Address><NS:sampleIPZone3Address>00000000</NS:sampleIPZone3Address><NS:sampleIPZone4Address>00000000</NS:sampleIPZone4Address><NS:sampleIPZone5Address>00000000</NS:sampleIPZone5Address><NS:sampleIPZone6Address>00000000</NS:sampleIPZone6Address><NS:sampleIPZone7Address>00000000</NS:sampleIPZone7Address></NS:sampleEntry> into doc('dbxml:/n_b_i_f_c_a_z.dbxml/doc_Running-SAMPLE')//NS:NS//NS:sampleTable"
Time in seconds for command 'query': 32.5002
and the query without the updation part takes ~14 sec ( shown below )
time query "declare namespace foo='MY-SAMPLE';declare namespace NS='NS'; doc('dbxml:/n_b_i_f_c_a_z.dbxml/doc_Running-SAMPLE')//NS:NS//NS:sampleTable"
Time in seconds for command 'query': 13.7289
The query :
time query "declare namespace foo='MY-SAMPLE';declare namespace NS='NS'; doc('dbxml:/n_b_i_f_c_a_z.dbxml/doc_Running-SAMPLE')//PMB:sampleTable/PMB:sampleEntry[@mySSIAddress='1000']"
Time in seconds for command 'query': 0.005375
is very fast.
The Updation of the document seems to consume much of the time.
Regards,
Kapil.

Issue with INSERT INTO, throws primary key violation error even if the target table is empty

Hi,
I am running a simple
INSERT INTO Table 1 (column 1, column 2, ....., column n)
SELECT column 1, column 2, ....., column n FROM Table 2
Table 1 and Table 2 have same definition(schema).
Table 1 is empty and Table 2 has all the data. Column 1 is primary key and there is NO identity column.
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How can this happen when the target table is totally empty?
Chintu

Nope thats not true
Either you're not inserting to the right table or in the background some other trigger code is getting fired which is inserting into some table which causes a PK violation.
Please Mark This As Answer if it solved your issue
Please Vote This As Helpful if it helps to solve your issue
Visakh
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Mechanism of a insert into select

Hi
I am using a insert with select in a batch program which is supposed to run just a little before midnight.
My question is, when a insert into a table occurs, does oracle select all the rows before the insert starts, OR, does the insert occur simultaneously with the select.
eg. table B has 4 rows
data is being inserted into A from B
does oracle select row1 from B and insert row1 into table A and then move to row2 in B and insert row2 into A
OR
does oracle select rows1 thro 4 in B before the first insert into A starts?
If anybody could point me to a document/reference about that would be aweosme.
--vj

There is no need to know this kind of internals. A statement is atomic, so it either completes in total or not at all. Other sessions cannot see intermediate results, even your own session is not able to. If you would try, for example by using database triggers, you'll get a mutating table error to prevent that.
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<b>Read Mode</b>
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In the "Read when navigating" mode below, data is requested in a hierarchy drilldown for the fully expanded hierarchy. In the "Read when navigating/expanding the hierarchy" mode, data in the hierarchy is aggregated by the database and transferred to the OLAP processor from the lowest hierarchy level displayed in the start list. When expanding a hierarchy node, the system intentionally reads this node's children.
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2. Read when navigating
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In contrast to the "Read when navigating/expanding the hierarchy" mode, the system always fully reads presentation hierarchies at tree level.
When expanding nodes, the OLAP processor can read the data from the main memory.
When accessing the database, the system uses the most suitable aggregate table and, if possible, aggregates in the database itself.
3. Read everything at once
There is only one read process in this mode. When executing the query in the Business Explorer, the data required for all possible navigation steps for this query is read to the OLAP processor's main memory area. When navigating, all new navigation statuses are aggregated and calculated from the main memory data.
The "Read when navigating/expanding the hierarchy" mode has a markedly better performance in almost all cases than the other two modes. This is because the system only requests the data that the user wants to see in this mode.
The "Read when navigating" setting, in contrast to "Read when navigating/expanding the hierarchy", only has a better performance for queries with presentation hierarchies.
In contrast to the two previous modes, the "Read everything at once" setting also has a better performance with queries with free characteristics. The idea behind aggregates, that is working with pre-aggregated data, is least supported in the "Read everything at once" mode. This is because the OLAP processor carries out aggregation in each query view.
We recommend you choose the "Read when navigating/ expanding the hierarchy" mode.
Only use different mode to "Read when navigating/ expanding the hierarchy" in exceptional circumstances.
The "Read everything at once" mode can be useful in the following cases:
The InfoProvider does not support selection, meaning the OLAP processor reads significantly more data than the query needs anyway.
A user exit is active in the query that prevents the system from having already aggregated in the database.
If it is Useful informatin to u pls provide points.
have nice day.
by
ANR

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Hi!
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[email protected]

In forms 6i demos CD, There is a demo form ocxvideo.fmb,
but it just for video in file system.
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data : commit_count type i.
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                  werks          = wa_marc-werks
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Before you all go off the deep end and ask why not just do the update, keep in mind that you don't want to update a million + rows and then do a commit either - that locks up the entire table!

The ENQUEUE lock insure that another program called by another user will not update the data at the same time, so preventing database coherence to be lost. In fact, another user on a SAP correct transaction, has read the record and locked it, so when it will be updated your modifications will be lost, also you could override modifications made by another user in another luw.
You cannot use a COMMIT WORK in a SELECT - ENDSELECT, because COMMIT WORK will close each and every opened database cursor, so your first idea would dump after the first update. (so the internal table is mandatory)
Go through some documentation like [Updates in the R/3 System (BC-CST-UP)|http://help.sap.com/printdocu/core/Print46c/en/data/pdf/BCCSTUP/BCCSTUP_PT.pdf]
Regards

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Hi all!
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Many thanks!

Hello
I've just been messing about with a similar problem. Basically, I have a view that involves a join across two tables, I have a data block in my form that's based on the view, and I've written an INSTEAD OF trigger to insert/update/delete from the two tables.
I was getting the error message 'Cannot insert or update data in a view', and it turned out that the error was happening because the join column between the two tables was the primary key on one of the tables, but the corresponding column on the join table had no unique key on it. This meant that Oracle couldn't establish a one-to-one relationship between rows in the view and rows in the underlying tables. The column on the join table was in fact unique on that table, and adding a unique constraint on that column in the database cured the problem.
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regards
Andrew
UK

Urgent : Performance Issue DELETE , INSERT INTO SELECT, UPDATE

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