How are JDBC batch updates implemented by Oracle?

When you're looking to reduce commits you typically think of JDBC batch updates.
I'm just wondering how are these implemented by Oracle and is there ever gains to be had to reducing commits in an Oracle specific way like say using VARRAYs with procedures?

Please refer
http://www.oracle.com/technology/products/oracle9i/daily/jun07.html

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JDBC Batch Updates & PreparedStatement problems (Oracle 8i)

Hi,
we're running into problems when trying to use JDBC Batch Updates with PreparedStatement in Oracle8i.
First of all, Oracle throws a SQLException if one of the statements in the batch fails (e.g. because of a unique constraint violation). As far as I understand, a BatchUpdateException should be thrown?
The next problem is much worse:
Consider this table:
SQL> desc oktest
ID NOT NULL NUMBER(10)
VALUE NOT NULL VARCHAR2(20)
primary key is ID
When inserting in through batch updates with a PreparedStatement, I can pass 'blah' as a value for ID without getting an exception (Oracle silently converts 'blah' to zero). Only when the offending statement is the last statement in the batch, Oracle throws an exception (again, SQLException instead of BatchUpdateException).
Any comments/suggestions are appreciated.
E-mail me if you want to see the code...
Thanks,
Oliver
Oracle version info:
(Enterprise Edition Release 8.1.6.0.0, JServer Release 8.1.6.0.0, Oracle JDBC driver 8.1.6.0.0 and 8.1.7.0.0 (we're using the 'thin' driver)
CLASSPATH=/opt/oracle/product/8.1.7/jdbc/lib/classes12.zip:...
null

Please refer
http://www.oracle.com/technology/products/oracle9i/daily/jun07.html

More log writer contention when using JDBC Batch Updates?

So if I'm already seeing log writer contention when I'm commiting inserts one row at a time.
Why would I see even more contention of log writer ie. commit waits in Enterprise Manager when I batch these inserts using JDBC updates.
Today I observed significantly more commit waits when I used JDBC batching vs commit one row at a time.

Please refer
http://www.oracle.com/technology/products/oracle9i/daily/jun07.html

People how are taking belle update as useless

i want to answer the people how are talking about belle is a useless update.first of all a update provide a hardware capacity to run new app.and about belle it is giving great stability to my phone
(i think) it provides number of improvment in user interface which making symbian once again in the race of mobile os like it had notification bar,we can manage menu in a very easy way
and the digital clock, though all people do not like it and nokia has given this update after a long testing,but a update is a update
please give me kudos if u like my post

Agree. RAM usage is far better as i mentioned somewhere in this forum before. And one thing more: if somebody is calling me while phone is in the pocket the proximity sensor responds quicker than it did on Anna. It was very frustrating if i took ringing cellphone out of my pocket and i had to wait for the display to turn on before answering to actually see who was calling me. Dialling pad is better on Belle in my opinion as there is less chance to accidentally press the green dial button when entering complete telephone number is not finished yet.

How do i Batch Update the table by reading .txt file

HI All,
Suppose we are going to update a database table for a number of records; the record IDs are stored in a text file and may be tens of thousands.
Regards,
Krishna

HI Bajaranglal,
Thanks for your response. I have thousands of records in a text file. Read the file and update the database table.anyhow i resolved the problem.
Hay are you from orissa? if so, please let me know from which place?
Thanks & Regards,
Krishna

How to SELECT FOR UPDATE with CMP (Oracle)

The most common database (Oracle) by default uses a scheme that does not fit into any of those isolation levels. A SELECT statement selects data at the start of the transactions, whereas a SELECT ... FOR UPDATE does something quite different. It is essential to do SELECT FOR UPDATEs before updating the row as SELECT does no lock. It's a hack that works well in practice.
1. Which isolation level is this?
2. More fundamentally, how an earth is it possible to use this scheme with CMP?! You would have to distinguish load() from loadForUpdate()! Is CMP inconsistent with Oracle?
This is a pretty big whole in the CMP spec!

No. thats no goes well.
Transaction serializable in Oracle uses a optimistic
concurrency system. And for update is a
pessimistic concurrency.
With optimistic: the system is faster but it can fail
With pessimistic: if doesnt fail (usually;)
You can solve the proble with many differents systems:
1. Edit the .xml descriptor files ans change the sql sentences.
And my prefer one.
2. Make a new jdbc driver that inherits from the original
oracledriver.
The new driver give u in "getConnection()" a new connection class that inherits from the original connection.
The executestatement and preparestatement adds the
string "for update" if the stattement was starting by select.
Configure your container to use the new driver.

How to right an update query in oracle using two tables?

Table1
ID     Dept
1     A
2     B
3     A
4     B
5     C
6     A
7     D
Table2
ID     Dept
1     A
2     B
3     A
4     B
5     C
6     A
7     D
How to update id in Table1 from Table2 on joining condition Table1.dept=Table2.dept
in Oracle

869357 wrote:
No it's not running, giving some error.That is because SQL server construct is different than that of Oracle.
Try with
update table1 a set a.id = (select min(b.id) from table2 b where a.dept = b.dept);
However, due the repeated department values will not give you the desired output.

How to use the update function using oracle eway

Hi All,
I have to update one column in the table i.e table1 using the oracle eway otd for which I have written the code like below.
otdRISKBLOCKVALUES.getRISKBLOCKVALUES().setBALANCE_AMOUNT( bd );
otdRISKBLOCKVALUES.getRISKBLOCKVALUES().update( sUpdate );
As show above Iam setting the value to the setbalance_amount method and later calling the update method passing the where condition through the string sUpdate.
But Iam getting an error as shown below.
[#|2008-03-12T12:04:42.389+0530|SEVERE|IS5.1.3|STC.eWay.DB.Oracle.com.stc.connector.oracleadapter.base.ResultSetAgentImpl|_ThreadID=17; ThreadName=Worker: 5; Context=project=prjDataXform,deployment=dpDataXform,collab=svcRisk,external=eaFileIn;|updateBigDecimal() failed - No current row|#]
[#|2008-03-12T12:04:42.389+0530|SEVERE|IS5.1.3|STC.eWay.DB.Oracle.com.stc.connector.oracleadapter.OracleSession|_ThreadID=17; ThreadName=Worker: 5; Context=project=prjDataXform,deployment=dpDataXform,collab=svcRisk,external=eaFileIn;|ErrorCode=17082, SQLState=null, Message=No current row|#]
could any one Pl.thow some input on this.
Thanks & regards in Advance
Srikanth

Hi,
You need to specify the row you want to update first.
The following code is taken from an example in the Oracle eway user guide:
otdOracle_1.getDb_employee().update( "WHERECLAUSE" );
while (otdOracle_1.getDb_employee().next()) {
   otdOracle_1.getDb_employee().setLAST_NAME( "Krishna" );
   otdOracle_1.getDb_employee().setFIRST_NAME( "Kishore" );
   otdOracle_1.getDb_employee().updateRow();
}Replace WHERECLAUSE with the desired condition.
Hope it helps
Gustavo

How are the latest updates working???

Hi
Been away for a while and notice that my trusty Apple System Update is suggesting some changes to iDVD, iPhoto, iMovieHD and Quicktime. Last time I took the plunge blindfolded, my iLife was a disaster (summer 06...). How is the current suite working? I have another project to do. Should I upgrade? The suite from the last upgrade seems to be "happy".
cheers
Terri

Hi t
If You have a working environment that works - why risk it ?
There has been some problems regarding iDVD 6.0.3 but if I understands it
right then this depends on miss matching with other programs eg. OS and QT.
So it seems as if OS is up to X.4.8 and QT to 7.1.3 it should work that said
if repair permissions has been run before + after updating.
Running repair hard disk (Apple disk util tool) from CD or ext hd from time to
another is also a good habit.
Yours Bengt W

JDBC Batching and XMLTYPEs

So, this question was originally asked here...
http://stackoverflow.com/questions/4327337/does-oracles-xmltype-support-jdbc-batch-updates
However, that was three years ago. Does JDBC batching still not help with performance with XMLType objects as of 11.2.0.3?

Hi William,
Assumming that you are batching only Statements and CallableStatements.
When a batch of say 10 statements are send and the 5th one fails, then Oracle JDBC returns an array of update counts till the
no of successfully executed statements , in this case it will be an array containing 4 elements( since the 5th failed).
from this we can find out which statement has failed.
note: this feature does not work with PreparedStatement. (to my knowledge there is no way of getting it)
Hope this helps
Elango.

Writing an update statement in oracle forms 9i

Hi ,
I have a problem situation in which
I am fetching values from a cursor and a recod group into two data block items text box and combo box respectively .
Both the data is fetched from different tables .
Now based on the selection from combo box I have to update the selected value in another table by writing an update statemet .
I have created a button and on the trigger event of when button pressed I wrote a simple update statement but it's not working that way .
Kindly help me how to write manual update statements in oracle forms 9i
I can't used the update buil in of forms as I want to update in a table which is not mentioned in the property pallete of data block
please help

I just wrote a procedure
PROCEDURE update_current IS
BEGIN
update table abc set xculumn= :block_name.item_name2 where ycolumn = :block_name.item_name1 ;
commit;
and I called the procedure from a when button pressed trigger
it gave an error invalid identifier abc ( which is table name)
pls help
I am trying to do it with form_ddl(update_query)
but here I am facing another problem
I have update_query = 'update table abc set xculumn= ' || :block_name.item_name2 || 'where ycolumn = '||:block_name.item_name1
now since xculumn and y column are varchar type so I suppose while preparing the query I have to concatenate single quotes ( ' ) at the start and end
but i am facing problems in doing so
please tell me an alternative way or how to concatenate single quotes in the above update_query variable

How to implement the JDBC call over SSL on Oracle?

I searched the forums and google. It seems to support Oracle 9i JDBC call, Thin driver can not work and we should use OCI.
I referenced OTN Oracle java example about the SSL, it talked about the security socket but not anythingabout JDBC. http://download-west.oracle.com/docs/cd/B10501_01/network.920/a96573/asoappf.htm#634403
Who can provide a clear description and resource URL to tell how to make a simple implementation on JDBC over SSL.
Thanks a lot.

That article you referenced is referring to the JVM that runs when one runs java stored procedures. It has nothing to do with JDBC.
You have a unusual requirement (probabaly originated as the same place as your alias.)
Most of the time SSL is not needed for the database because the database and the applications that talk to it are already on a secured network.
You can investigate some third party drivers, I believe I recall seeing that one of them does SSL.
Alternatively you might look into a secure VPN connection. The connection travels over IP and tunnels other traffic through it. Given that the tunned itself is secure, the contents are as well.

How does jdbc fetch a set of records in oracle

Hi,
Oracle does not support server side cursors,if so how does jdbc fetch a set of records(set by setFetchSize(), which is 10 by default) each time I say rs.next().Does this mean Query is re-executed to fetch the next set of records? Can some body throw some light on this?
thanx in advance
Gnayan

You are asking about implementation details of some JDBC driver, but you don't say which one. This makes it very difficult to answer your question. You might want to try asking the question of the people who wrote the driver.

Oracle 10G AS, Batch Update doesn't commit.

Hello,
We are using Batch uptdate to commit a set of records, but to our surprise one of the batches commits in DB and the other doesnt.
The below pseudo code explains our scenario :
String str1="INSERT INTO TBL1 (COL1,COL2) VALUES (?,?) ";
String str2="UPDATE TBL2 SET COL1=? WHERE COL2=?";
PreparedStatement pstmt1=conn.prepareStatement(str1);
PreparedStatement pstmt2=conn.prepareStatement(str2);
for(500 recs)
pstmt1.addbatch();
pstmt2.addbatch();
On 500 Recs
//This batch updates the DB and commits too
pstmt1.executeBatch();
pstmt1.clearBatch();
con.commit();
//The Batch executes successfully, but updates are not reflected in DB,
//which may mean that it must not be committing in DB
pstmt2.executeBatch();
pstmt2.clearBatch();
con.commit();
- In the above, pstmt1 is an INSERT and pstmt2 is an UPDATE.
- It so happens that at the end, DB reflects Inserts done by pstmt1, but it doesnt reflect the Updates of pstmt2.
- We have also fired a SELECT stmt immediately after pstmt2 Execute Batch, but the updated values are not reflected.
- Also the above scenario works absolutely fine if we use a STATEMENT instead of a PREPAREDSTATEMENT for pstmt2.
Set up Details:
App Server :: Oracle 10G AS for Linux 2.1,
Database Driver :: Oracle 10G Driver which is bundled with Oracle 10G AS
Database :: Oracle 9i
Any ideas in this regards would be highly appreciated.
Thanks !
- Khyati
Message was edited by:
user473157

I think this is not the right forum for this question; probably a JDBC forum or one of the Oracle AS forums.
Kuassi

Batch Updates Using Oracle

Hi,
We are currently having problems saving data using Weblogic 6.1 sp1 and Oracle
8.1.6. we are using Weblogic JDBC Drivers for Oracle. The data we are saving is to
the extent of 25-50,00 records. When we are trying to this we are getting transaction
timeout errors since this saver process is taking more than 30 seconds which is out
rimeout limit.
Can we do this using Batch updates?? Any code snippets or pointers will be grealty
appreciated.
Thank YOu,
Sanjeev

Can you be more specific?
- What do you want to do exactly?
- What are your OS and Reports versions?
At first, it sounds a bit strange to use Reports for batch updates. A pl/sql procedure may be more suitable.
You can schedule a report in several ways, e.g. via CRON on Unix (see RWRUN command in the 9iDS Help)).
You can do the same via the database using the SRW package (see http://download-west.oracle.com/docs/html/A92102_01/pbr_evnt.htm#1005558 )
You can use the Reports Queue Manager.

How are JDBC batch updates implemented by Oracle?

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