Does Update statement update only changed columns?

Let's say I have TABLE1 with columns ID NUMBER(2,0),FNAME VARCHAR2(20),LNAME VARCHAR2(20), AGE NUMBER(2,0). I insert a new record:
INSERT INTO TABLE1 (ID,FNAME,LNAME,AGE) VALUES(1,'Steve','Jobs',40);
then I say:
UPDATE TABLE1 SET FNAME='Steve', LNAME='Jobs',AGE=56 WHERE ID=1;
As you see only the value of AGE column is different but in the UPDATE statement I still set the other columns to the previous values to. I wonder if Oracle is smart enough to update only the AGE column or does it update all the columns?

I don't think that Oracle is making this check: it simply updates columns as specified in the SQL statement.
Here is a 5 year old J. Lewis article that explains why Oracle is working this way: http://jonathanlewis.wordpress.com/2007/01/02/superfluous-updates/.

Similar Messages

Will updates to an EJB3 entity bean update ONLY changed columns?

Hello,
If you have an EJB3 entity bean that maps to a table, and then you change the value of ONE of the fields in the entity bean, will each column in the row be updated, OR just the column that changed in the row?
Thanks

Only fields detected as persistent-dirty will be updated in the database record.
Laurent

Access for update only one column in table?

Hi all,
My need is to grant access for update only one column c1 in table t1.
I guess I should use view, could you please give me some example? Maybe other ideas?

Hi,
You can grant privileges on individual columns.
GRANT   UPDATE (c1)
ON      t1
TO      grantee_name;Look up GRANT in the SQL language manual. Annoyingly, in recent editions of the manual, GRANT is not indexed, but it's in alphabetic order with all the other statements:
http://docs.oracle.com/cd/E11882_01/server.112/e26088/statements_9013.htm#i2155015

Help please, spacific file update only changed files when moved

I record live bands and file size can be very large when i make changes to files i want to save time and resources by only updating what has changed without replacing the whole file. when moving files from desktop to external drive.
say i have a file named "jam" that i add files to on my external drive then i copy it to my internal drive, do some edditing and add some files. when i move it back to external drive i want to update the "jam" file add the new files and changed files without having to keep track of the changed files and not transfer the files that havent changed. can anyone help?

Only files and folders below directory "/emmc" will show up in windows explorer.
You will also not be able to edit (add/delete) files to the /system/media/audio/notifications folder (or just about any folder above /emmc) . This is because you do not have administrator access (for lack of a better term) to the phone.
So, if it's that important to you, you'll have to find a way to tell the phone you're an administrator
Windows Explorer correctly identifies these as two separate drives. There is, after all, a built in drive as well as the swappable SDcard.
Sorry I can't be of more help.

Update of varray columns

Hi all,
Can I update a varray column.Oracle version we are using is 9.2.0.8.
In the below given table structure and sample data, in second insert statement, email column is having null values.In the actual table we have around 200 - 300 columns where email value is null, i want update those columns where email is null.Is it possible to update only one column in a varray column.
CREATE TABLE XXEACCESS_IMPL
( REQUEST_ID VARCHAR2(20 BYTE),
STATUS CHAR(1 BYTE),
SYSTEM_IMPL VARCHAR2(50 BYTE),
ART_REQUEST_ID NUMBER,
CALL_DATA WF_PARAMETER_LIST_T,
LAST_UPDATED_DATE DATE DEFAULT sysdate);
CREATE OR REPLACE type SCOTT.WF_PARAMETER_T as object
( NAME VARCHAR2(30), VALUE VARCHAR2(2000),
MEMBER FUNCTION getName return varchar2,
MEMBER FUNCTION getValue return varchar2,
MEMBER PROCEDURE setName (pName in varchar2),
MEMBER PROCEDURE setValue(pValue in varchar2));
CREATE OR REPLACE
type body SCOTT.WF_PARAMETER_T as
MEMBER FUNCTION getName return varchar2 is
begin
return name;
end getName;
MEMBER FUNCTION getValue return varchar2 is
begin
return value;
end getValue;
MEMBER PROCEDURE setName(pName in varchar2) is
begin
name := pName;
end setName;
MEMBER PROCEDURE setValue(pValue in varchar2) is
begin
value := pValue;
end setValue;
end;
Insert into XXEACCESS_IMPL
(REQUEST_ID, STATUS, SYSTEM_IMPL, ART_REQUEST_ID, CALL_DATA, LAST_UPDATED_DATE)
Values ('EA39050', 'Y', 'CONTACT_MANAGEMENT_REQUEST', 27084, wf_parameter_list_t(
wf_parameter_t('EMAIL', '[email protected]'), wf_parameter_t('DOMICILE', 'US')), TO_DATE('05/03/2006 16:45:18', 'MM/DD/YYYY HH24:MI:SS'));
Insert into XXEACCESS_IMPL
(REQUEST_ID, STATUS, SYSTEM_IMPL, ART_REQUEST_ID, CALL_DATA, LAST_UPDATED_DATE)
Values
('EA39045', 'Y', 'CREATE_ACCOUNT', 27089,
wf_parameter_list_t(
wf_parameter_t('EMAIL',''),WF_PARAMETER_T('DOMICILE','US')),
TO_DATE('05/03/2006 17:13:08', 'MM/DD/YYYY HH24:MI:SS'));
Please help me in this regard.
Thanks
Raghu

You can use this statement:
UPDATE xxeaccess_impl x
   SET call_data =
       CAST (MULTISET (SELECT CASE WHEN temp_tab.name = 'EMAIL' AND temp_tab.value IS NULL THEN
wf_parameter_t ('EMAIL', '[email protected]')
ELSE
VALUE (temp_tab)
END CASE
                         FROM TABLE (SELECT call_data
                                       FROM xxeaccess_impl
                                      WHERE x.ROWID = ROWID
                                     ) temp_tab
             AS wf_parameter_list_t
            );But, better way is to use PL/SQL: retrieve the entire varray, update its elements, and then store the changed varray back in the database.
Regards,
Zlatko

Tabular Report for Update a single column

Hello Everyone,
I have a tabular report which will display 1 column (apart from primary key),
1. I will display a edit icon (on primary key)
2. when the user selects this icon, this only row must become updatable (only one column must become text item, so that user can modify the value).
3. Next this text item, i would like to display save button and cancel button so that user can click one of these buttons next to that particular row.
Any help would be appreciated.
Regards
Anil

There is no easy way to do this without some incredibly lengthy javascript. Tabular forms still do not give much declarative control to the developer.
If you are looking to click a button and update one column on one row, it's easiest to change your design to two pages using report and form. Make the first page the report with an Edit button, click the button (nothing more than a link) and it goes to a basic form with only one updateable field. After submit, branch back to the first page. Easy.
For the end user, there are no more mouse clicks involved in this than what you described originally so it's likely it'll be an acceptable application design change.

Update the change record in z table

Hi,
I am doing a module pool programming.If i change the particular record only changed record shd be updated in the z table.
How can i update only changed record in the database table in module pool.
Regards

Hi Rasheed,
Use this code to update ztable from the module pool table control, its working.
At screen flow logic
PROCESS BEFORE OUTPUT.
MODULE STATUS_8001.
LOOP WITH CONTROL TAB.
    MODULE PASS_DATA. "module to pass data into table control
ENDLOOP.
PROCESS AFTER INPUT.
MODULE USER_COMMAND_8001.
LOOP WITH CONTROL TAB. "tab is the table control on the screen
    MODULE MODIFY_DATA. "module to modify data in internal table
ENDLOOP.
MODULE SAVE_DATA. "module to save the modified data into database table
Design a PF-Status with a SAVE button with function code 'SAVE'.
In PBO
MODULE STATUS_8001 OUTPUT.
SET PF-STATUS 'Z_TABCT'. "pf-status with appropiate buttons
* SET TITLEBAR 'xxx'.
DATA : LINE_COUNT TYPE I.
DESCRIBE TABLE ITAB
LINES LINE_COUNT.
TAB-LINES = LINE_COUNT + 3. "increment the line of table control dynamically so that table control becomes scrollable
ENDMODULE.                 " STATUS_8001 OUTPUT
MODULE PASS_DATA OUTPUT.
SORT ITAB.
READ TABLE ITAB INDEX TAB-CURRENT_LINE.
ENDMODULE.                 " PASS_DATA OUTPUT
In PAI
MODULE USER_COMMAND_8001 INPUT.
OK_CODE = SY-UCOMM.
CASE OK_CODE.
    WHEN 'BACK'.
      LEAVE TO SCREEN 8000.
ENDCASE.
ENDMODULE.                 " USER_COMMAND_8001 INPUT
MODULE MODIFY_DATA INPUT.
MODIFY ITAB INDEX TAB-CURRENT_LINE.
ENDMODULE.                 " MODIFY_DATA INPUT
MODULE SAVE_DATA INPUT.
OK_CODE = SY-UCOMM.
CASE OK_CODE.
    WHEN 'SAVE'.
      MODIFY ITAB INDEX TAB-CURRENT_LINE. "update modifed records
      UPDATE ZTABLE FROM TABLE ITAB. "update database table from internal table
ENDCASE.
ENDMODULE.                 " SAVE_DATA INPUT
Hope this solves your problem.
Thanks & Regards
Tarun Gambhir

What property/preference sets block property "Update changed columns only"

Hi, we are wondering how Designer (latest version 10.1.2.4) desides when it generates a form with block property "Update changed columns only" set to Yes.
Under some cricumstances this property is No in the generated .fmb
We checked the object library, but the .olb has this property set to No, so Designer overrules it.
Our goal is to generate all blocks with the "Update changed columsn only" set to No, because we ran in a forms bug that it can't handle Insert statements on blocks with this property set to Yes (ORA-01036). This bug only occurs in the latest forms version 10.1.2.3
Hope anyone can help to force this property to be No when we want to achieve 100% generation from Designer.
Kind Regards
Auke Quist
Edited by: aukequist on Oct 13, 2008 8:49 PM

I think that's not possible in designer. You could define a block with this property set in the template form or in the object library. The use this block use the template/library object property in designer.
Regards Erik

Block based on Stored Procedure - Update Changed columns only

If I were to base a block on stored procedures that includes an Update procedure but only update SOME of the updateable columns, what happens?
Does the Form send to server ONLY
1) The rows that were updated
2) The columns that updated
3) All columns in the row being updated regardless of whether they were updated
Is the correct answer 1) + 2) or 1) + 3)
Please help.
Thanks

Hello,
There is another example here
Francois

Update Changed Columns Only

How to generate a form with a data block with the "Update Changed Columns Only" property set to "yes" from Designer 9.0.4.6? Is there an equivalent for this property in Designer? Or do I have to create a library object which I then have to subclass from?
Thanks in advance
Gerald

Hi Gerald
When you look in the help of Designer (Generated data block properties (implicit/explicit)), the Forms property "Update Changed Columns Only" is not mentioned. That implies that there is no property/preference in Desinger that will influence the value of this Forms property.
So yes, you have to create a library object and subclass from it.
Another solution is to work with the Forms built-ins GET_BLOCK_PROPERTY and SET_BLOCK_PROPERTY in a Pre_Form trigger, but I personally would prefer a new library object for this.
Kind regards,
Lennart de Vos

Is it possible that my update stats used only correct tables?

Whenever there is a schedule maintenance run I receive a error:
Executing the query "UPDATE STATISTICS [Perf].[PerfHourly_F65954CD35A54..." failed with the following error: "Table 'PerfHourly_F65954CD35A549E886A48E53F148F277' does not exist.". Possible failure reasons: Problems with the query, "ResultSet"
property not set correctly, parameters not set correctly, or connection not established correctly.
Is it possible that my update stats used only correct tables?
Thanks

Use below script ...(change if required)
USE [dbname]
go
DECLARE @mytable_id INT
DECLARE @mytable VARCHAR(100)
DECLARE @owner VARCHAR(128)
DECLARE @SQL VARCHAR(256)
SELECT @mytable_id = MIN(object_id)
FROM sys.tables WITH(NOLOCK)
WHERE is_ms_shipped = 0
WHILE @mytable_id IS NOT NULL
BEGIN
SELECT @owner = SCHEMA_NAME(schema_id), @mytable = name
FROM sys.tables
WHERE object_id = @mytable_id
SELECT @SQL = 'UPDATE STATISTICS '+ QUOTENAME(@owner) +'.' + QUOTENAME(@mytable) +' WITH ALL, FULLSCAN;'
Print @SQL
EXEC (@SQL)
SELECT @mytable_id = MIN(object_id)
FROM sys.tables WITH(NOLOCK)
WHERE object_id > @mytable_id
 AND is_ms_shipped = 0
END
Or use below for required table only but it will not execute only generate script, make change as per ur requirements:
SELECT X.*,
ISNULL(CASE
 WHEN X.[Total Rows]<=1000
 THEN
 CASE
 WHEN [Percent Modified] >=20.0
 THEN 'UPDATE STATISTICS ' + [Schema Name] + '.' + [Table Name] + ' WITH ALL, FULLSCAN --20% Small Table Rule'
 END
 WHEN [Percent Modified] = 100.00
 THEN 'UPDATE STATISTICS ' + [Schema Name] + '.' + [Table Name] + ' WITH ALL, FULLSCAN --100% No real Stats Rule'
 --WHEN X.[Rows Modified] > 1000
 --THEN 'UPDATE STATISTICS ' + [Schema Name] + '.' + [Table Name] + ' WITH ALL, FULLSCAN --1000 Rows Modified Rule'
 ELSE
 CASE
 WHEN X.[Total Rows] > 1000000000 --billion rows
 THEN CASE
 WHEN [Percent Modified] > 0.1
 THEN 'UPDATE STATISTICS ' + [Schema Name] + '.' + [Table Name] + ' WITH ALL, FULLSCAN -- 1B Big Table Rule'
 END
 WHEN X.[Total Rows] > 100000000 --hundred million rows
 THEN CASE
 WHEN [Percent Modified] > 1.0
 THEN 'UPDATE STATISTICS ' + [Schema Name] + '.' + [Table Name] + ' WITH ALL, FULLSCAN -- 100M Big Table Rule'
 END
 WHEN X.[Total Rows] > 10000000 --ten million rows
 THEN CASE
 WHEN [Percent Modified] > 2.0
 THEN 'UPDATE STATISTICS ' + [Schema Name] + '.' + [Table Name] + ' WITH ALL, FULLSCAN -- 10M Big Table Rule'
 END
 WHEN X.[Total Rows] > 1000000 --million rows
 THEN CASE
 WHEN [Percent Modified] > 5.0
 THEN 'UPDATE STATISTICS ' + [Schema Name] + '.' + [Table Name] + ' WITH ALL, FULLSCAN -- 1M Big Table Rule'
 END
 WHEN X.[Total Rows] > 100000 --hundred thousand rows
 THEN CASE
 WHEN [Percent Modified] > 10.0
 THEN 'UPDATE STATISTICS ' + [Schema Name] + '.' + [Table Name] + ' WITH ALL, FULLSCAN -- 100K Big Table Rule'
 END
 WHEN X.[Total Rows] > 10000 --ten thousand rows
 THEN CASE
 WHEN [Percent Modified] > 20.0
 THEN 'UPDATE STATISTICS ' + [Schema Name] + '.' + [Table Name] + ' WITH ALL, FULLSCAN -- 10K Big Table Rule'
 END
 END
END,'') AS [Statistics SQL]
FROM (
SELECT DISTINCT
 DB_NAME() AS [Database],
 S.name AS [Schema Name],
 T.name AS [Table Name],
 I.rowmodctr AS [Rows Modified],
 P.rows AS [Total Rows],
 CASE
 WHEN I.rowmodctr > P.rows
 THEN 100
 ELSE CONVERT(decimal(8,2),((I.rowmodctr * 1.0) / P.rows * 1.) * 100.0)
 END AS [Percent Modified]
FROM
 sys.partitions P
 INNER JOIN sys.tables T ON P.object_Id = T.object_id
 INNER JOIN sys.schemas S ON T.schema_id = S.schema_id
 INNER JOIN sysindexes I ON P.object_id = I.id
WHERE P.index_id in (0,1)
AND I.rowmodctr > 0
) X
WHERE [Rows Modified] > 1000
ORDER BY [Rows Modified] DESC
Please click "Propose As Answer"
if a post solves your problem, or "Vote As Helpful" if a post has been useful
to you

Does anyone know how to change your country location ? I am traveling and I need to make a purchase and do updates. My App Store tells me I need to switch to a US store to make purchases.

Does anyone know how to change your country location ? I am currently traveling and I need to make a purchase and do updates. My App Store tells me I need to switch to a US store to make purchases.

Unless you live in the country and have a credit card with a billing address in the country-you don't.
http://www.apple.com/legal/itunes/us/terms.html#GIFTS
"The iTunes Service is available to you only in the United States, its territories, and possessions. You agree not to use or attempt to use the iTunes Service from outside these locations. Apple may use technologies to verify your compliance."
Substitute whatever your home country is if it is not the US, terms are the same.

BUG JSF h:dataTable with JDBC ResultSet - only last column is updated

I tried to create updatable h:dataTable tag with three h:inputText columns with JDBC ResultSet as data source. But what ever I did I have seceded to update only the last column in h:dataTable tag.
My JSF page is:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<%@ page contentType="text/html;charset=windows-1250"%>
<%@ taglib uri="http://java.sun.com/jsf/html" prefix="h"%>
<%@ taglib uri="http://java.sun.com/jsf/core" prefix="f"%>
<f:view>
<html>
<head>
<meta http-equiv="Content-Type"
content="text/html; charset=windows-1250"/>
<title>Stevan</title>
</head>
<body><h:form>

<h:messages/>


<h:dataTable value="#{tabela.people}" var = "record">
<h:column>
<f:facet name="header">
<h:outputText value="PIN"/>
</f:facet>
<h:inputText value="#{record.PIN}"/>
</h:column>
<h:column>
<f:facet name="header">
<h:outputText value="Surname"/>
</f:facet>
<h:inputText value="#{record.SURNAME}"/>
</h:column>
<h:column>
<f:facet name="header">
<h:outputText value="Name"/>
</f:facet>
<h:inputText value="#{record.NAME}"/>
</h:column>
</h:dataTable>

<h:commandButton value="Submit"/>
</h:form></body>
</html>
</f:view>
My java been is:
package com.steva;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
public class tabela {
private Connection conn;
private ResultSet resultSet;
public tabela() throws SQLException, ClassNotFoundException {
Statement stmt;
Class.forName("oracle.jdbc.OracleDriver");
conn = DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:xe", "hr", "hr");
stmt = conn.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE, ResultSet.CONCUR_UPDATABLE);
resultSet = stmt.executeQuery("SELECT PIN, SURNAME, NAME FROM PERSON");
public ResultSet getPeople() {
return resultSet;
I have instaled “Oracle Database 10g Express Edition Release 10.2.0.1.0” – product on my PC localy. I have enabled HR schema and I have instaled and pupulated with sample data folloving table:
CREATE TABLE "PERSON"
( "PIN" VARCHAR2(20) NOT NULL ENABLE,
 "SURNAME" VARCHAR2(30),
 "NAME" VARCHAR2(30),
 CONSTRAINT "PERSON_PK" PRIMARY KEY ("PIN") ENABLE
I have:
Windows XP SP2
Oracle JDeveloper Studio Edition Version 10.1.3.1.0.3894
I am not shure why this works in that way, but I think that this is a BUG
Thanks in advance.

Hi,
I am sorry because of formatting but while I am entering text looks fine but in preview it is all scrambled. I was looking on the Web for similar problems and I did not find anything similar. Its very simple sample and I could not believe that the problem is in SUN JSF library. I was thinking that problem is in some ResultSet parameter or in some specific Oracle implementation of JDBC thin driver. I did not try this sample on any other platform, database or programming tool. I am new in Java and JSF and I have some experience only with JDeveloper.
Java been(session scope):
package com.steva;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
public class tabela {
private Connection conn;
private ResultSet resultSet;
public tabela() throws SQLException, ClassNotFoundException {
Statement stmt;
Class.forName("oracle.jdbc.OracleDriver");
conn = DriverManager.getConnection
("jdbc:oracle:thin:@localhost:1521:xe", "hr", "hr");
stmt = conn.createStatement
(ResultSet.TYPE_SCROLL_INSENSITIVE, ResultSet.CONCUR_UPDATABLE);
resultSet = stmt.executeQuery("SELECT PIN, SURNAME, NAME FROM PERSON");
public ResultSet getZaposleni() {
return resultSet;
JSF Page:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<%@ page contentType="text/html;charset=windows-1250"%>
<%@ taglib uri="http://java.sun.com/jsf/html" prefix="h"%>
<%@ taglib uri="http://java.sun.com/jsf/core" prefix="f"%>
<f:view>
<html>
<head>
<meta http-equiv="Content-Type"
content="text/html; charset=windows-1250"/>
<title>Stevan</title>
</head>
<body><h:form>

<h:messages/>


<h:dataTable value="#{tabela.zaposleni}" var = "record">
<h:column>
<f:facet name="header">
<h:outputText value="PIN"/>
</f:facet>
<h:inputText value="#{record.PIN}"/>
</h:column>
<h:column>
<f:facet name="header">
<h:outputText value="Surname"/>
</f:facet>
<h:inputText value="#{record.SURNAME}"/>
</h:column>
<h:column>
<f:facet name="header">
<h:outputText value="Name"/>
</f:facet>
<h:inputText value="#{record.NAME}"/>
</h:column>
</h:dataTable>

<h:commandButton value="Submit"/>
</h:form></body>
</html>
</f:view>

ORA-14402: updating partition key column would cause a partition change

Hi,
When I am trying to execute an update statement where i am tring to update date values emp_det from 11-oct-2010 to 12-nov-2010.
Oracle throws an error :
ORA-14402
updating partition key column would cause a partition change
I think that this is because emp_det is a partitioning key of a partitioned table.
Oracle documentation says that
"UPDATE will fail if you change a value in the column that would move the
row to a different partition or subpartition, unless you enable row
movement" .
alter table t enable row movement;
I did not understand what is meant by "enable row movement".
I cannot drop the partitions and recreate it after updating the table and also i don't have proper priviliges for enale row movement syntax
because of the lack of privileges. How to solve this is issues with out row movement and recreate partition.
Can this be done by a developer or is there any other way to execute update in this case? its urgent.. pls help..
thanks in advance..
By
Sivaraman
Edited by: kn_sivaraman on Nov 1, 2010 2:32 AM

kn_sivaraman wrote:
I did not understand what is meant by "enable row movement". Each partition in partitioned table is physically separate segment. Assume you have a row that belongs to partition A stored in segment A and you change row's partitioning column to value that belongs to partition B - you have an issue since updated row can't be now stored in segment A anymore. By default such update is not allowed and you get an error. You can enable row movement and Oracle will move row to target partition:
SQL> CREATE TABLE SALES_LIST(
2                          SALESMAN_ID NUMBER(5,0),
3                          SALESMAN_NAME VARCHAR2(30),
4                          SALES_STATE VARCHAR2(20),
5                          SALES_AMOUNT NUMBER(10,0),
6                          SALES_DATE DATE
7                         )
8    PARTITION BY LIST(SALES_STATE)
9    (
10     PARTITION SALES_WEST     VALUES('California', 'Hawaii'),
11     PARTITION SALES_EAST     VALUES('New York', 'Virginia', 'Florida'),
12     PARTITION SALES_CENTRAL VALUES('Texas', 'Illinois'),
13     PARTITION SALES_OTHER    VALUES(DEFAULT)
14    )
15 /
Table created.
SQL> insert
2    into sales_list
3    values(
4           1,
5           'Sam',
6           'Texas',
7           1000,
8           sysdate
9          )
10 /
1 row created.
SQL> update sales_list
2    set sales_state = 'New York'
3    where sales_state = 'Texas'
4 /
update sales_list
ERROR at line 1:
ORA-14402: updating partition key column would cause a partition change
SQL> alter table sales_list enable row movement
2 /
Table altered.
SQL> update sales_list
2    set sales_state = 'New York'
3    where sales_state = 'Texas'
4 /
1 row updated.
SQL> SY.

My iPod Touch Gen 5 will no longer synch with iTunes on my computer. Only change since this happened is update to iPod to OS 8.1.1 iPod synch remains stuck in "Step 8 of 8"

My iPod Touch Gen 5 will no longer synch with iTunes on my computer. Only change since this happened is update to iPod to OS 8.1.1 iPod synch remains stuck in "Step 8 of 8"

On your computer go to the control panel (hover in the lower right corner) then programs, add/remove programs
Uninstall iTunes, Apple Mobile Device Service, Apple Application Support then go to apple.com and redownload and reinstall iTunes and try again.
You won't lose any content, you're not deleting that, just the programs that access them.
What is thought to happen is that sometimes a new version of itunes doesn't update the drivers in those other two programs. The only way to update the drivers is to force it by uninstalling the programs which allows itunes to write the correct ones.
My iPad and iPod did exactly the same thing and this is how I fixed it.

Does Update statement update only changed columns?

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