Update query for large no of records

i have a doubt regarding an update statement and performance.
There is a table with the following fields:
empno,ename,esal,edept..etc.,
now consider that i want to update the field salary with null for all the employees and suppose there 10 million records...how will i do that efficiently....?

Assuming updating the rows is the most efficient solution, write a single UPDATE statement that updates 10 million rows. 10 million rows isn't huge by today's standards. My laptop can update 10 million rows of a moderately sized table in a couple minutes at the outside.
Justin

Similar Messages

Update query for 2 lakhs records

I have 2 tables with 3 common columns (Col1, col2,Primary). One common column name is primary (oracle key word). No indexes are used on these tables. I need to write an update query as shown below.
Emp table
Col1       col2        primay
100         101         y
103         104         n
201         105         y
100         101         y
Dept table
Col1       col2        primay
100         101         null
103         104         null
000         656         null
Update query Result
Col1       col2        primary
100         101         y
103         104         n
Please help me.
Thanks

Update dept d
set d.primay = (select distinct e.primay from emp e where e.col1 = d.col1 and e.col2 = d.col2);
In emp table there are 100 and 101 with two entries but with same primay value. so to handle such scenarios I have taken distinct iniside select statement.
if you have a case like where in emp table col1 and col2 are same and having different primay table, then obviously you should tell which value should go and update the dept table and based on what logic.

Performance of update query for single column vs multiple column

Hi All,
I could not find any answer for this, does it ever matter in terms of performance updating single column versus multiple column in a single update query.
For eg. table consisting of 15 columns, what would be the difference in performance when one column is update in the single query against another update query where 15 columns are updated.
Please do keep in mind my table columns in actually could be around 150+.
Thanks for any information provided.

If updated columns aren´t on where clause , then the only impact of 15 columns will be a increase on redo generation, and a possible chainning row.
So since the redo is one of the things that have a large impact, the answer is yes.
The performance will be slower.
Regards
Helio Dias.
http://heliodias.com
OCE SQL, OCP 9i

Querying for large number of objects... searchspec limitation

As part of a product i'm developing i may come across a scenario where i need to query for 100+ specific objects based on ids.
I know the query input for WS 2.0 has a "searchspec" string field, but based on the sheer number of specific objects i need to query for i'm afraid the string may eventually get too large.
Is there a way around this? Can i send multiple individual queries in a batch request? Can i add more than one search object to a single query page request? Anything?
Thanks!
-Kevin

A few options available using the WS v2.0 Query methods:
1. Use Arguments like page size and startrownumber arguments. This will allow you to specify the pagesize of the recordset to be returned and also the starting row number.
2. The searchspec is a powerful argument and it supports a set of binary and unary operators. Refer the Ondemand user guide for a more complete set of operators supported by searchspec. To narrow the results of your query, you could use the "AND" operator between 2 or more fields in your object query.
Hope this helps.
Jaya

Update query for lumia 925

Hi All,
I'm using Lumia 925, recently got an update option for my phone and I updated it.
Its now showing lumia black.
But even after the update I'm not able to get the option for call+sms setting (for call block feature)
Can someone help me with this??
Thanks
Aman Mehra

Hi mehraaman,
Kindly Update all System Apps on your phone. Follow the instruction here: WP8 System Apps.

Update query for a table

Hi
Can any body send valid update query like this:
<sql:update var="XX">
Update emp set name='yy', phone='1234' where id='abc'
</sql:update>
Thanks in Advance
SP

Hi
Can any body send valid update query like this:
<sql:update var="XX">
Update emp set name='yy', phone='1234' where id='abc'
</sql:update>
Thanks in Advance
SP

Single Update query for multiple tables

Hiii ....
I want to update Table A and Table B in a single update query can it be possible.
it is something like i have previously done with Mysql.
e.g ..
UPDATE A, B set a.A=1, b.B=X where (id.A= id.B) and id=101.
Is it possible or how can i do it, help me out.

sorry, i am posting the mysql example agin, it is something like this
e.g ..
UPDATE A, B set A.a=1, B.b=X where (A.id= B.id) and A.id=101

Improving SQL query for large records.

I need to extract the difference on the table t1 and t2(contains both almost 6M records). Im looking specifically on the two columns (c1,c2)for my comparison.I need also to look at reference table to extract also other fields for my report. thank you
Dynamic Table (same table and structure but different records.)
t1
t2
Reference Static Table (all the tables below have two columns. c1 and c2 used for reference only)
t3
t4
t5
--Extracting data in t1 but not exists in t2
WITH v1 AS(SELECT c2,c3,c4 FROM t1 at1
WHERE NOT EXISTS (SELECT 'x' FROM t2 at2 WHERE at1.c1 = at2.c2)),
v2 AS (SELECT c1, c2 FROM t3),
v3 AS (SELECT c1, c2, c3 FROM t4),
v4 AS (SELECT c1,c2 FROM t5)
SELECT v1.c1, v1.c2, v3.c2, v4.c2 FROM t,t2,t3,t4
WHERE v1.c1 = v2.c1
AND v2.c2 = v3.c1
AND v3.c2 = v4.c1
ORDER BY v1.c1
I'm trying to improve my scripts to generate the record as fast as possible coz it takes too long. Any suggestions guys.? Im trying to look also on explain plan but I'm new on this. thank you

Hi,
your sample code can not compile?
There is no column c1 in the v1?
Probably a typo anyway :)
A couple of remarks:
The way you've used v1, v2, v3 and v4 does not help performance.
It only helps increasing the confusion.
Rewrite the query without the WITH clause, post the execution plan for the query and report your Oracle version and we can help you further.
/ Ronnie

Table Properties: Tweaks for large number of records

Hi experts,
I have a small table, about 5 columns, which will store records numbering in millions (at least 7 million). Is there any specific list of properties/checklist that I need to look into and ensure that the db health is good?
Regards,
Anand.

Make sure you have appropriate indexing for your query needs. Make sure you have sufficient and complete declarative integrity constraints in place - yes foreign keys and check constraints matter and affect query plans. Seven million rows is not necessarily a lot, however you might consider how the data is accessed, used, and purged and see if partitioning is appropriate ( if you are licensed for the option). Also, make sure the SQL is efficient as possible - for instance if you are updating this table using a cursor loop, all it will do is get massively slower over time.

CAML Query for Large List.

Hi All,
I am having list in which there are more 60000 items in to it. Can you guys please help me out that what is the best practice to execute query on such large list ?
Is it a good way to increase thresold limit ? I don't think so. What else I can do ?
Any idea ? Please suggest.
Thanks in advance.

Hi Jaydeep,
I'hv updated my code as per your link described : but still its showing an error. Below I am pasting my source code.
Below is my code :
SPList list = spWeb.Lists.TryGetList("ListName");
SPQuery query = new SPQuery();
//query.QueryThrottleMode = SPQueryThrottleOption.Override;
query.Query = @"<Where>
<Eq>
<FieldRef Name='TCode' />
<Value Type='Text'>" + tcode + @"</Value>
</Eq>
</Where>";
query.ViewAttributes = "Scope=\"Recursive\"";
query.RowLimit = 200;
do
SPListItemCollection itemCollcetion = list.GetItems(query);
foreach (SPListItem item in itemCollcetion)
if (!tRoles.Contains(item["Title"].ToString()))
tRoles.Add(item["Title"].ToString());
query.ListItemCollectionPosition = itemCollcetion.ListItemCollectionPosition;
} while (query.ListItemCollectionPosition != null);
Limit it set to 10000 records and my list is having 13000 records. Above code executes under run with elevated previliges.
Any suggestions ?
Thanks in advance.

Query For Large Amount of Data

Hello All,
I apologize in advance if I am not posting this in the right section. I am fairly new to APEX and database designing. My goal is to create an inquiry screen for a database of people.
I am running APEX 4.2 on 11g. The information is store in 3 tables; Names, Demographics, Address. Each table had a PIN ID column that ties them all together. Each table has almost a million rows in them.
Currently I have it set up that the person types in the name they want to search and it gets passed into a hidden page item on the next page where there is a report with a select statement based on the page item. Everything works right now however it is slow. I am having a 5-10 second delay before the results come up.
My question is, is there a better way to set up these tables. What is the best way to make this faster?
I'm sorry if this is a vague question but any help, or point in the right direction will be greatly appreciated
Thank You !

976533 wrote:
Hello All,Welcome to the forum: please read the FAQ and forum sticky threads (if you haven't done so already), and update your forum profile with a real handle instead of "976533".
When you have a problem you'll get a faster, more effective response by including as much relevant information as possible upfront. This should include:
<li>Full APEX version
<li>Full DB/version/edition/host OS
<li>Web server architecture (EPG, OHS or APEX listener/host OS)
<li>Browser(s) and version(s) used
<li>Theme
<li>Template(s)
<li>Region/item type(s) (making particular distinction as to whether a "report" is a standard report, an interactive report, or in fact an "updateable report" (i.e. a tabular form)
With APEX we're also fortunate to have a great resource in apex.oracle.com where we can reproduce and share problems. Reproducing things there is the best way to troubleshoot most issues, especially those relating to layout and visual formatting. If you expect a detailed answer then it's appropriate for you to take on a significant part of the effort by getting as far as possible with an example of the problem on apex.oracle.com before asking for assistance with specific issues, which we can then see at first hand.
I apologize in advance if I am not posting this in the right section. I am fairly new to APEX and database designing. My goal is to create an inquiry screen for a database of people.It might be more appropriate to the {forum:id=75} forum, so you should look at the following entries on their FAQ as well:
<li>{message:id=9360002}
<li>{message:id=9360003}
I am running APEX 4.2 on 11g. The information is store in 3 tables; Names, Demographics, Address. Each table had a PIN ID column that ties them all together. Each table has almost a million rows in them.
Currently I have it set up that the person types in the name they want to search and it gets passed into a hidden page item on the next page where there is a report with a select statement based on the page item. Everything works right now however it is slow. I am having a 5-10 second delay before the results come up.
My question is, is there a better way to set up these tables. What is the best way to make this faster? Are there suitable indexes on the tables?
Does the report query use them?
As described above, either: reproduce the problem on apex.oracle.com; or post DDL to allow us to recreate the tables and indexes, and the SQL from your report.

Update Query For Hierarchy Table

Hi All
I have a Hierarchy table that has news categories. I want use a query than when user deactivate a category, all child category has been deactivated. For example
1- Politics
1-1- National Politics
1-2- International Politics
1-2-1- Asia
1-2-2- Africa
2- Economic
If Politics has been deactivated, all child must be deactivate. (1-1, 1-2, 1-2-1, 1-2-2)
Please help me
With Best Regards

This is table structure script:
SET NUMERIC_ROUNDABORT OFF
GO
SET ANSI_PADDING, ANSI_WARNINGS, CONCAT_NULL_YIELDS_NULL, ARITHABORT, QUOTED_IDENTIFIER, ANSI_NULLS ON
GO
IF EXISTS (SELECT * FROM tempdb..sysobjects WHERE id=OBJECT_ID('tempdb..#tmpErrors')) DROP TABLE #tmpErrors
GO
CREATE TABLE #tmpErrors (Error int)
GO
SET XACT_ABORT ON
GO
SET TRANSACTION ISOLATION LEVEL SERIALIZABLE
GO
BEGIN TRANSACTION
GO
PRINT N'Creating schemata'
GO
PRINT N'Creating [dbo].[Modules]'
GO
CREATE TABLE [dbo].[Modules]
[Module_ID] [int] NOT NULL,
[ModuleName] [varchar] (100) COLLATE SQL_Latin1_General_CP1_CI_AS NULL,
[ModuleTitle] [nvarchar] (100) COLLATE SQL_Latin1_General_CP1_CI_AS NULL,
[Status] [int] NULL
GO
IF @@ERROR<>0 AND @@TRANCOUNT>0 ROLLBACK TRANSACTION
GO
IF @@TRANCOUNT=0 BEGIN INSERT INTO #tmpErrors (Error) SELECT 1 BEGIN TRANSACTION END
GO
PRINT N'Creating primary key [PK_Modules] on [dbo].[Modules]'
GO
ALTER TABLE [dbo].[Modules] ADD CONSTRAINT [PK_Modules] PRIMARY KEY CLUSTERED ([Module_ID])
GO
IF @@ERROR<>0 AND @@TRANCOUNT>0 ROLLBACK TRANSACTION
GO
IF @@TRANCOUNT=0 BEGIN INSERT INTO #tmpErrors (Error) SELECT 1 BEGIN TRANSACTION END
GO
PRINT N'Creating [dbo].[Categories]'
GO
CREATE TABLE [dbo].[Categories]
[Category_ID] [int] NOT NULL IDENTITY(1, 1),
[Module_ID] [int] NOT NULL,
[ParentID] [int] NULL,
[Name] [varchar] (100) COLLATE SQL_Latin1_General_CP1_CI_AS NULL,
[Title] [nvarchar] (100) COLLATE SQL_Latin1_General_CP1_CI_AS NULL,
[Priority] [int] NULL,
[ThumbnailImage] [varchar] (255) COLLATE SQL_Latin1_General_CP1_CI_AS NULL,
[Status] [int] NULL
GO
IF @@ERROR<>0 AND @@TRANCOUNT>0 ROLLBACK TRANSACTION
GO
IF @@TRANCOUNT=0 BEGIN INSERT INTO #tmpErrors (Error) SELECT 1 BEGIN TRANSACTION END
GO
PRINT N'Creating primary key [PK_Categories] on [dbo].[Categories]'
GO
ALTER TABLE [dbo].[Categories] ADD CONSTRAINT [PK_Categories] PRIMARY KEY CLUSTERED ([Category_ID])
GO
IF @@ERROR<>0 AND @@TRANCOUNT>0 ROLLBACK TRANSACTION
GO
IF @@TRANCOUNT=0 BEGIN INSERT INTO #tmpErrors (Error) SELECT 1 BEGIN TRANSACTION END
GO
PRINT N'Adding foreign keys to [dbo].[Categories]'
GO
ALTER TABLE [dbo].[Categories] ADD CONSTRAINT [FK_Categories_Modules] FOREIGN KEY ([Module_ID]) REFERENCES [dbo].[Modules] ([Module_ID])
GO
IF @@ERROR<>0 AND @@TRANCOUNT>0 ROLLBACK TRANSACTION
GO
IF @@TRANCOUNT=0 BEGIN INSERT INTO #tmpErrors (Error) SELECT 1 BEGIN TRANSACTION END
GO
IF EXISTS (SELECT * FROM #tmpErrors) ROLLBACK TRANSACTION
GO
IF @@TRANCOUNT>0 BEGIN
PRINT 'The database update succeeded'
COMMIT TRANSACTION
END
ELSE PRINT 'The database update failed'
GO
DROP TABLE #tmpErrors
GO
This is table data
SET NUMERIC_ROUNDABORT OFF
GO
SET ANSI_PADDING, ANSI_WARNINGS, CONCAT_NULL_YIELDS_NULL, ARITHABORT, QUOTED_IDENTIFIER, ANSI_NULLS, NOCOUNT ON
GO
SET DATEFORMAT YMD
GO
SET XACT_ABORT ON
GO
SET TRANSACTION ISOLATION LEVEL SERIALIZABLE
GO
BEGIN TRANSACTION
-- Pointer used for text / image updates. This might not be needed, but is declared here just in case
DECLARE @pv binary(16)
PRINT(N'Drop constraints from [dbo].[Categories]')
GO
ALTER TABLE [dbo].[Categories] DROP CONSTRAINT [FK_Categories_Modules]
PRINT(N'Add 14 rows to [dbo].[Categories]')
GO
SET IDENTITY_INSERT [dbo].[Categories] ON
INSERT INTO [dbo].[Categories] ([Category_ID], [Module_ID], [ParentID], [Name], [Title], [Priority], [ThumbnailImage], [Status]) VALUES (1, 1, NULL, 'News', N'اخبار', 1, NULL, 1)
INSERT INTO [dbo].[Categories] ([Category_ID], [Module_ID], [ParentID], [Name], [Title], [Priority], [ThumbnailImage], [Status]) VALUES (2, 2, NULL, 'Article', N'مقالات', 2, NULL, 1)
INSERT INTO [dbo].[Categories] ([Category_ID], [Module_ID], [ParentID], [Name], [Title], [Priority], [ThumbnailImage], [Status]) VALUES (3, 3, NULL, 'Galleries', N'گالری', 3, NULL, 1)
INSERT INTO [dbo].[Categories] ([Category_ID], [Module_ID], [ParentID], [Name], [Title], [Priority], [ThumbnailImage], [Status]) VALUES (4, 1, 1, 'Politics', N'سیاسی', 1, NULL, 1)
INSERT INTO [dbo].[Categories] ([Category_ID], [Module_ID], [ParentID], [Name], [Title], [Priority], [ThumbnailImage], [Status]) VALUES (5, 1, 1, 'Economic', N'اقتصادی', 2, '', 1)
INSERT INTO [dbo].[Categories] ([Category_ID], [Module_ID], [ParentID], [Name], [Title], [Priority], [ThumbnailImage], [Status]) VALUES (6, 1, 4, 'NationalPilitics', N'سیاست داخلی', 1, '', 1)
INSERT INTO [dbo].[Categories] ([Category_ID], [Module_ID], [ParentID], [Name], [Title], [Priority], [ThumbnailImage], [Status]) VALUES (7, 1, 4, 'InternationalPolitics', N'سیاست خارجی', 2, NULL, 1)
INSERT INTO [dbo].[Categories] ([Category_ID], [Module_ID], [ParentID], [Name], [Title], [Priority], [ThumbnailImage], [Status]) VALUES (8, 1, 7, 'Asia', N'آسیا', 1, '', 1)
INSERT INTO [dbo].[Categories] ([Category_ID], [Module_ID], [ParentID], [Name], [Title], [Priority], [ThumbnailImage], [Status]) VALUES (9, 1, 7, 'Europe', N'اروپا', 2, NULL, 1)
INSERT INTO [dbo].[Categories] ([Category_ID], [Module_ID], [ParentID], [Name], [Title], [Priority], [ThumbnailImage], [Status]) VALUES (10, 1, 7, 'Africa', N'آفریقا', 3, NULL, 1)
INSERT INTO [dbo].[Categories] ([Category_ID], [Module_ID], [ParentID], [Name], [Title], [Priority], [ThumbnailImage], [Status]) VALUES (11, 2, 2, 'Scientic', N'علمی', 1, NULL, 1)
INSERT INTO [dbo].[Categories] ([Category_ID], [Module_ID], [ParentID], [Name], [Title], [Priority], [ThumbnailImage], [Status]) VALUES (12, 2, 2, 'Art', N'هنری', 2, NULL, 1)
INSERT INTO [dbo].[Categories] ([Category_ID], [Module_ID], [ParentID], [Name], [Title], [Priority], [ThumbnailImage], [Status]) VALUES (13, 3, 3, 'Culture', N'فرهنگی', 1, NULL, 1)
INSERT INTO [dbo].[Categories] ([Category_ID], [Module_ID], [ParentID], [Name], [Title], [Priority], [ThumbnailImage], [Status]) VALUES (14, 3, 3, 'Religion', N'مذهبی', 2, NULL, 1)
SET IDENTITY_INSERT [dbo].[Categories] OFF
PRINT(N'Add constraints to [dbo].[Categories]')
GO
ALTER TABLE [dbo].[Categories] ADD CONSTRAINT [FK_Categories_Modules] FOREIGN KEY ([Module_ID]) REFERENCES [dbo].[Modules] ([Module_ID])
COMMIT TRANSACTION
GO
Thanks for your help

Update query for XMLTYPE column

Hello everyone,
I have inserted xml data into XMLTYPE column of my table,xml data is something like this
<Data type="FYI">
<ID xmlns="http://orcl.com">T-1-1</ID>
<Category>FRAME</Category>
<ProductID>1</ProductID>
<Name xmlns="http://orcl.com">Frame </Name>
<Type>BASIC</Type>
<Code>INSTALL</Code>
<NodeID>1</NodeID>
</Data>
Now i need to update the values inside the <Data> element,like
ID == T-2-2
Category == IFRAME
ProductID == 1.1
Name == IFRAME
We are using oracle 10g R2.
Please help me out how to update. It would be very thankfull for your valuble suggestions
Thanks in advance

<Services>
<DataService type="FRLY">
<ID xmlns="http://www.openapplications.org/oagis/9">T-1-1-FRLY</ID>
<CategoryCode>FRAME</CategoryCode>
<ProductOfferingID>1</ProductOfferingID>
<Name xmlns="http://www.openapplications.org/oagis/9">Frame Relay</Name>
<SubType>FRLY - BASIC</SubType>
<ActionCode>INSTALL</ActionCode>
<NodeID>1</NodeID>
<Contract>
<ID xmlns="http://www.openapplications.org/oagis/9" schemeName="Networx Universal">00000</ID>
<Category name="Contract Type">U</Category>
</Contract>
<Contract>
<Type xmlns="http://www.openapplications.org/oagis/9">Routine</Type>
</Contract>
<CustomerParty>
<Location/>
</CustomerParty>
<ProvisioningStatus type="BillingSetup">
<Description xmlns="http://www.openapplications.org/oagis/9">C</Description>
</ProvisioningStatus>
<MileStone>
<ID xmlns="http://www.openapplications.org/oagis/9">CWD</ID>
<Date>2007-01-29</Date>
</MileStone>
<ActivityStatus>
<Code xmlns="http://www.openapplications.org/oagis/9" name="DueDate"/>
<EffectiveDateTime xmlns="http://www.openapplications.org/oagis/9">2007-01-29T00:00:00Z</EffectiveDateTime>
</ActivityStatus>
<AssociatedIDs>
<ID xmlns="http://www.openapplications.org/oagis/9">1</ID>
</AssociatedIDs>
<AssociatedIDs>
<TemporaryID schemeName="OPKEY">34908</TemporaryID>
</AssociatedIDs>
<Location>
<ID xmlns="http://www.openapplications.org/oagis/9">T-510092</ID>
</Location>
<OrderID>RequestID</OrderID>
<Accessory>
<ActionCode>ADD</ActionCode>
<Description xmlns="http://www.openapplications.org/oagis/9">IBM ESERVER-XSERIES306</Description>
<CategoryCode>5</CategoryCode>
<InstallVendorParty>
<Name xmlns="http://www.openapplications.org/oagis/9">MCI</Name>
</InstallVendorParty>
</Accessory>
<Circuit>
<ID xmlns="http://www.openapplications.org/oagis/9">T-1-1-FRLY</ID>
<AssociatedIDs/>
</Circuit>
</DataService>
</Services>
This was my xml which i have inserted into DB for the column XMLTYPE.Now i need to update few values in this whole file like values of
ID under<DataService>
Name under <DataService>
ID under <Contract>
Description under <ProvisioningStatus>
i was using the UPDATEXML query to update those it's saying i row updated but when i extract it says null.
Please help me out to solve this problem.
Thanks in advance.

UPDATE query for GEOMETRY (spatial data)

Hi,
how to update values dynamically for this geometry type " MDSYS.SDO_GEOMETRY(2002,8307,MDSYS.SDO_POINT_TYPE(0,0,'null'),MDSYS.SDO_ELEM_INFO_ARRAY(1,2,1),MDSYS.SDO_ORDINATE_ARRAY(-0.44106912,0.46456902,-0.72306504,0.09942102))" please help me.

Thanks Reetesh for your reply.
As this is a simple task I wan't to do it via OAF query rather than writing PL/SQL procedure.
I have two tables , say error table and interface table, (there is a foreign key relation ship between these tables, ie. i have to show the interface name present in the interface table via the foreign key in the error table). I used the following query to get the data
SELECT xxgblErrorMasterEO1.ERROR_ID_NO,
xxgblErrorMasterEO1.ERROR_CODE,
xxgblErrorMasterEO1.ERROR_MESSAGE,
xxgblErrorMasterEO1.CREATED_BY,
xxgblErrorMasterEO1.CREATION_DATE,
xxgblErrorMasterEO1.LAST_UPDATED_BY,
xxgblErrorMasterEO1.LAST_UPDATE_DATE,
xxgblIntfProgramMaster.INTERFACE_NAME,
xxgblErrorMasterEO1.ERROR_TYPE
FROM XXEEG.XXGBL_ERROR_MASTER xxgblErrorMasterEO1,
XXEEG.XXGBL_INTF_PROGRAM_MASTER xxgblIntfProgramMaster
where xxgblErrorMasterEO1.INTERFACE_ID_NO =
xxgblIntfProgramMaster.INTERFACE_ID_NO
I like the idea of Advanced table while going through the tutorial (example 2) and would want to show certain fields by expanding on the + mark ( just like in the explorer)
now i want to update any of the fields that i show to the user (except the WHO fields). Say for example if the user updates the error_message and Interface_name, so how should i write the update method in the AM ?
Pardon me if this sounds simple :(

Update query for managing an Oracle spatial database

Hi,
i'm trying to manage a spatial network i have created in Oracle 11g. One of the tables i have created named "DE_OSM_RT_LINK$", contains data for links which exist between nodes. The link table contains a column named "Cost". All the values of this column are equal to "0". I need to UPDATE these values with the length of each link. I have made a query which finds the length (using data from the geometry column) but i can't make a query that finds the length and simultaneously updates the "cost" column. The query i have tried to make in order to update the "cost" column with the length is:
UPDATE DE_OSM_RT_LINK$
SET COST = (SELECT SDO_GEOM.SDO_LENGTH (d.geometry, m.diminfo)
FROM DE_OSM_RT_LINK$ d, user_sdo_geom_metadata m
WHERE m.table_name = 'DE_OSM_RT_LINK$' AND m.column_name = 'GEOMETRY');
It doesn't run. I can't find what else is needed in this query in order to update the "cost" column. Could you please help me because i don't have much experience?
Thank you

Try connecting as SCOTT/TIGER, then do this:
select * from user_sdo_geom_metadata;
if the table does not exist, then spatial hasn't been installed
if it does exist, then spatial (or locator) has been installed.
If the table didn't exist, rerun the installer, choose a custom
installation, and check the Spatial box, then install.
If the table did exist, or after you install spatial, you'll want to
use the user's guide, or take the spatial course to get started.

Update query for large no of records

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