Max columns per tables

H,
What is max number columns per table in database express edition ? I have requirement of creating a table with 100 columns but it seems database only accepts table with 94 columns.any way out ?

Hi Hardy,
Here's a quote from Oracle's SQL documentation:
"The absolute maximum number of columns in a table is 1000. However, when you
create an object table or a relational table with columns of object, nested table, varray,
or REF type, Oracle Database maps the columns of the user-defined types to relational
columns, in effect creating hidden columns that count toward the 1000-column limit."
Where are you seeing the "94 maximum"?
Andy

Similar Messages

What's the max number of columns a table can have on 32 bit OS & 64 bit OS

What is the max number of columns a table can have on 32 bit OS & 64 bit OS ?
Edited by: sameer naik on 02-Jul-2010 02:11

For TimesTen 7.0 and 11.2.1 releases the limit on the number of columns per table is 1000 for both 32 and 64 bit TimesTen. This can be found in the documentation under System Limits.
Regards,
Chris

Feature Request | Allow custom metadata per table/column to be stored

Someone please correct me if there's already a feature that allows this...
I'd like to see a feature where you can define a set of metadata that can be stored per table / column, and perhaps a trigger that updates that metadata.
As a use case, it is sometimes necessary to find out how many records exist in a table, and the typical way of doing this is by running a statement like select count(*) from example_table;. With a large table, this statement might take a long time though, and certainly has overhead associated with it. If this is something that's done on a regular basis, like maybe even once every minute, wouldn't it be much better to store this number as metadata for the table that can be updated on inserts and deletes and then can be queried? It might involve extra overhead on an insert or delete statement to add to or subtract from this number, but then for some applications the benefit of getting the count quickly might outweigh the extra overhead.
Another use case is finding a minimum or maximum out of a table. Say you store a date and you need to find the max value for some feature in your application; with a large table, and especially if its a date with accuracy to the millisecond where an index wouldn't help much because most values are unique, it can take quite a bit of time and overhead to find that max value. If you could define for that column that you'd like to store the max value in metadata, and could query it, it would be very quick to get the info. The added overhead in this scenario would be on insert, update or especially on delete, the value would have to be updated. But in some applications, if you don't expect alot of deletes or updates on this column, it might be worth the added overhead to be able to quickly find the max value for this column.
I know you could probably make a separate table to store such info, and write triggers to keep it up to date, but why not have a built in feature in Oracle that manages it all for you? When you create a table, you could define with the column definition something like 'METADATA MAX' and it will store the max value of that column in metadata for you, etc.
I know that the overhead of this feature wouldn't be good for most circumstances, but there certainly are those cases where it would be hugely beneficial and the overhead wouldn't matter so much.
Any thoughts?
Can this be submitted as a feature request? Am I asking in the right place?
(p.s. while you're at it, make a feature to mimic IDENTITY columns from SQL Server!)

I don't think what you mentioned is exactly what I was talking about. There's no min_value or max_value in the dba_tab_columns table; there's only high_value and low_value, and they are stored in binary. And I believe to be accurate in the use cases that I suggested, you would have to analyze the table after every insert/update/delete. So no, that's not the same feature I've asked for, although I appreciate the feedback.
Also, the num_rows in dba_tables relies on the table being analyzed too, so for a table that stores temporary date to be processed where you want to know the size of the queue every few seconds, it wouldn't make sense to analyze the whole table every few seconds when all you want is a count of the records, and it's also inefficient to use the COUNT function with every query when it would be much faster to store the count in some metadata form that is updated with every insert or delete (adding to a count and subtracting from a count with each insert/delete is WAY faster than analyzing the table and letting it literally recount the entire table every time).
So again, while I appreciate the feedback, I don't think what you mentioned addresses either of the use cases I gave. I'm talking about a different kind of user defined metadata that could be stored per table/column with rules to govern how it is updated. Not you standard metadata that requires an analyze and isn't real time. I also only gave a few use cases, but the feature I'm really looking for is the ability for users to define many different types of custom metadata even maybe based on their own logic.
Again, this feature could be implemented right now by creating a USERMETADATA table for every standard table you have, and then using triggers to populate the info you want at the table level and column level, but why do that when it could be built in?
Also, I don't really agree that having to create a trigger/sequence for every table instead of setting a column as IDENTITY is better. It's cumbersome. Why not build these commonly used features in? It can create a trigger/sequence behind the scenes for all I care, but why not at least let someone mark a column as IDENTITY (or use whatever other term you want) at the time of table creation and let it do everything for them. But that's off-topic; I meant it for more of a side comment, but should really have a separate post about it.

Max.No. of columns a table can have in oracle9i db.10g?

wat is the maximun no. of columns a table can have in the oracle database
version 9i. and in the version oracle 10g.

Limit is 1000 for both versions
http://download-west.oracle.com/docs/cd/B10501_01/server.920/a96536/ch44.htm#288033
http://download-uk.oracle.com/docs/cd/B19306_01/server.102/b14237/limits003.htm

XML Column from table extract to Pipe Delimited Text File

Hi,
I have an XML column with large data in a Table ( Source SQL server Database).
I was asked to extract XML column to .txt file using SSIS.
Is it possible to extract xml column with huge data to text file ?
when I tried, select XML column from Table in source , I noticed that Property of column is taken as [DT_NTEXT] . I Converted it to DT_TEXT as Ansi donot support DT_NTEXT.
Execution method was success but it failed due to trucation. so wondering is there a way to get XML column extracted to Pipe delimited text file?
Is it advisable to do this ? or IS It Valid to export XML in Pipe Delimited File ?
Please Kindly advice
thanks
kodi

Are you looking at shredding data within XML nodes and then importing it to text file or are you looking at exporting XML value as is? Also is SSIS a necessity?
If not, You can simply use T-SQL for this along with bcp for this. just use a query like
EXEC xp_cmdshell 'bcp "SELECT CAST(XMLColumn AS varchar(max)) AS Column FROM table" queryout <full file path> -c -S <ServerName> -T -t |'
provided you use trusted connection (windows authentication)
see
http://visakhm.blogspot.in/2013/10/bcp-out-custom-format-data-to-flat-file.html
If you want to shred the data use Xpath functions in the query as below
http://visakhm.blogspot.in/2012/10/shred-data-as-well-as-metadata-from-xml.html
Please Mark This As Answer if it helps to solve the issue Visakh ---------------------------- http://visakhm.blogspot.com/ https://www.facebook.com/VmBlogs

Update columns in Table A based on columns in Table B for more than 500K rows

Guys,
I need to update 9 columns in table A based on value from table B for for more than 500K rows.
So what is best way to achieve this. I am thinking of writing a Procedure with cursor to update the rows of table A.
When i googled about it, they say cursor will decrease the performance. So i have no clue how to go for this.
Rough code which i though
1) Procedure with no parameter
2) Will declare 9 variable to store value from cursor
3) cursor will fetch row by row based on join condition between table a and table b
4) i will pass column values from table B to variables
5) will make an update statement for table A
Please let me know if above method is correct or is there any other way to do this without using cursor.

Guys,
Below is the rough code i wrote as per my requirement. Does it look correct? As of now i dont have any platform to test it so any help with the below code is highly appreciated. As i said i need to update more than 500K rows by matching Table
A and Table B. One more thing which i would like to add in below code, is to get log of all the rows that are in table B but not exist in table A. Table A already has more than million data in it.
Also not sure how the loop in below code willl run when @rowcount is become to zero?
Please let me know if i need to consider performance related impact while running the script.
GO
SET SERVEROUTPUT ON
CREATE PROCEDURE ONETIMEUPDATE
DECLARE @cnt INT;
SET @cnt = 1;
DECLARE @MSG varchar(255);
DECLARE @COUNT_VAR INT;
SET @COUNT_VAR=0;
WHILE @cnt > 0
    BEGIN
  Update TOP (50000) A
  Set A.Col1=B.Col1,
      A.COL2=B.COL2,
      A.COL3=B.COL3,
      A.COL4=B.COL4,
      A.COL5=B.COL5,
      A.COL6=B.COL6,
      A.COL7=B.COL7
  From TableA A
         Inner Join TableB B
         on A.ID = B.ID--ID
         WHERE A.Col1 <> B.Col1
                OR A.Col2 <> B.Col2;
         SET @cnt = @@ROWCOUNT;
         IF @@ROWCOUNT=25000
          @COUNT_VAR=@COUNT_VAR + @@ROWCOUNT
          SELECT @MSG = CONVERT(varchar, @COUNT_VAR) + "Rows Updated" -- I WANT TO DISPLAY UPDATE after EVERY 25000 ROWS
          PRINT @MSG
  IF @@ROWCOUNT=0
     BEGIN
           COMMIT
                   END
                WAITFOR DELAY '00:00:01' --wait for a second before the next update
            END;
END;

Max column number?

Hi, I have been making a site and using mysql db.
What should be the max column numbers in a table?
One of my tables has about 60 columns in which clients information kept.
Is that makes any problem?
Or shall I divide smaller tables?
Thanks...

regerybets wrote:
Hi, I have been making a site and using mysql db.
What should be the max column numbers in a table?
One of my tables has about 60 columns in which clients information kept.
Is that makes any problem?
Or shall I divide smaller tables?
Thanks...The number itself is not a concern you should have. The problem is having data grouped together that does not belong together.
Read up about table normalization in a relational database. Usually you would strife for the third normal form (3NF).
Edited by: SabZero on Nov 26, 2009 12:21 PM

Max column length

I will like to find out what is the MAX column length for nchar and nvarchar types using AL16UTF16.
As per the metalink article 'Examples and limits of BYTE and CHAR semantics usage' it is 1000 and 2000 for 2 bytes characters. But in Al16UTF16, characters can also take up to 4 bytes. So does that change the max limits.
Also what is MAX length for a Clob and NClob type

in Al16UTF16, characters can also take up to 4 bytes. No. One character (code point) is represented in 2 bytes. However, some characters are mapped to surrogate pair of code points, as pointed out by the Note "In AL16UTF16 this will use 2 UTF16 codepoints and so occupy 4 bytes.".
So the limits noted still applies. If you have logical characters mapped to more than one code point, more space will of course be required for storage.

Reg:How to delete the column in table control also from database table.

Hi Experts,
Once again thank u all for giving the responses.
one more doubt is how to delete the columns of table control and also the record shold delete from ztable.
With Regards,
Saroja.P.

Hi,
If you want to delete the rows in the table control and simultaneously delete it from the database table, then you can implement a 'DELETE' functionality specific to your table control. Have a MARK field (you will find that in the screen attributes of the table control -> give a name for the MARK field, you will find an additional MARK column at the beginning of your table control). You can check whatever rows you want to delete from the table control, call the delete module.
"This portion of code inside the LOOP...ENDLOOP.
IF sy-ucomm eq 'F_DELETE'.
gt_itab2-check = mark. " Store the MARK field status into your internal table's correspoding field 'check'
MODIFY gt_itab INDEX tabcontrol-current_line.
ENDIF.
iF sy-ucomm eq 'DELETE1'.
DELETE gt_itab WHERE check eq 'X'. "Your internal table does not have rows that you want to delete
ENDIF.
Now you can modify your database table using the MODIFY statement.
MODIFY ZDB FROM TABLE gt_itab.

How to Enable and Disable column in Table Control.

Hi all,
I want to make certain column of Table control as Enable or Disable on Button action.
Enable means ready for input and Disable means not ready for input.
Please send me sample code.
Thanks in advance.

Hi Vipin,
    You have to loop through the table columns to set the properties in the PBO of your screen.
Here is the sample solution.
delcare a workarea for the columns in the table control in your top include.
Table Control .
CONTROLS: TAB1 TYPE TABLEVIEW USING SCREEN '0100'.
DATA: WA_COLS LIKE LINE OF TAB1-COLS.
in your screen
PROCESS BEFORE OUTPUT.
MODULE INTIALISE_100.
*&      Module 0100_INTIALISE OUTPUT
MODULE INTIALISE_100 OUTPUT.
    LOOP AT TAB1-COLS INTO WA_COLS.
      WA_COLS-SCREEN-INPUT = 1.
      MODIFY TAB1-COLS FROM WA_COLS TRANSPORTING SCREEN-INPUT.
    ENDLOOP.
ENDMODULE.                 " 0100_INTIALISE OUTPUT
modify the screen-input property as required for the table control columns.
Please provide points if helpfull.....
Thanks,
Karthik
Message was edited by: Karthik
        Karthikeyan K

Tabular Form: Conditional column based on another column in table/form?

Hi!
I have 4 columns in table A:
number (the question number)
question (the question to be asked)
type (TEXT, LOV are the 2 valid values)
answer (the answer with text or a selection from the lov table below)
I have 2 columns in table B:
number (the question number)
values (a single value for the lov's)
In table B there can be mutiple rows for each number. Table A and table B
join on the number.
I want to build a tablular form on table A where for each row either a text
box or a select list is displayed depending on the contents of the type column.
So row 1 would display a text box when the type value is text; row 2 would
display a select list when the type value is lov.
Is this even possible? How do I refer to the type column in the conditional for the
answer column? I am guessing that I will need to have 2 answer columns one
that displays when the type column is TEXT and one that displays when the
type column contains LOV. This is OK. Setting up the conditional is display is the issue at this point.
Hopefully I have explained this well enough! :)
Thanks!
Dave Venus

Hi Dave,
Sorry for not responding sooner - I finish work at 3pm GMT.
I'll take your first question first (3:28PM posting according to my display - not sure if you are on GMT time?):
As far as I understand it, using the select_list_from_query() function generates the options that are required in the select list as HTML tags. Each instance of this function should create a SELECT tag and the results of the query should generate one or more OPTION tags within it.
Second question (4:20PM posting):
The HTMLDB_ITEM functions are listed in the documentation - here's a link to the online version:
http://download-east.oracle.com/docs/cd/B19306_01/appdev.102/b14303/api.htm#sthref2524
Most of the examples that I have seen have been on this forum - simply search for HTMLDB_ITEM or one of its functions.
I tend to leave the generation of tabular forms to the wizard as much as possible. The only exceptions are when I need to have access to more than the Primary Key for a row but don't want to show the field on screen. There are examples on the forum about concatenating the HTMLDB_ITEM functions into a single value - this hides ID fields from the user but makes them available to PL/SQL code.
Third question (5:29PM posting)
I did try using DECODE in my questionnaire but not for the feature that you needed. Originally, I wanted to use this to display one of a number of different fields (ie, my date, number or string field as appropriate to the question) but this didn't help as I couldn't get back to the right field during the update. If you have decode working for the select lists, then that's great!
The first column should be hidden or sitting behind a checkbox as this should be the Primary Key for the row and should not be editable by the user nor would it normally be displayed.
As long as your select statement creates the correct output (albeit that you may need to work on the layout!), you should have an updatable form. However, you will need to have the MRU processes in place and the appropriate buttons that trigger these. When I did my questionnaire, I created the form using a wizard to get all of the processes and buttons and then changed the select statement. If you haven't got the processes and/or buttons, we can go through adding these onto your page.
Last question (9:08PM posting)
As explained above, column 1 should normally be hidden. The INPUT tag you detail above is what I would expect to see. The value="6" attribute indicates that 6 is the Primary Key for that row - every row will have the same tag but different values for the "value" attribute. So, if it is hidden and these are the tags you see doing a View Source on the page, then everything is correct.
OK. So now we have the data on screen and (hopefully?) we have the correct processes and buttons on the page.
The next step would be validation and update of the data.
Validation of the data can be handled by a normal page process - I can let you have example code if you want to validate the data (this will also explain how to loop through the rows - there are also methods that you can use to do this in javascript if you want). Updates should be handled by the processes and buttons on the page - again, if you haven't got these we can go through adding them in (although, if you haven't yet formatted your page, you may find it quicker to copy your select statement and create the page again using the same select statement).
ORA-20001 errors are user defined errors. Do you mean the "data has changed" errors? If so, you will probably need to include the MD5 checksum functionality (it's shown in the document linked above).
Finally, we'll keep this thread going so that you have all of your workings and my responses in one place, if that's ok with you?
Regards
Andy

Is there a recommended limit on the number of custom sections and the cells per table so that there are no performance issues with the UI?

Is there a recommended limit on the number of custom sections and the cells per table so that there are no performance issues with the UI?

Thanks Kelly,
The answers would be the following:
1200 cells per custom section (NEW COUNT), and up to 30 custom sections per spec.
Assuming all will be populated, and this would apply to all final material specs in the system which could be ~25% of all material specs.
The cells will be numeric, free text, drop downs, and some calculated numeric.
Are we reaching the limits for UI performance?
Thanks

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Are you trying to setup P2P? Could you explain the process you followed completely? By anychance you create the backup and then created the publication?
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Interactive Report - Icon View - Dynamic Columns per Rows ?

Hi all,
We use the icon view functionnality in Interactive Report.
Is there a way to display the 'columns per row' attribute as an application item and set it dynamical via PL/SQL ?
Any suggestions?
Thanks in advance for advices,
Regards,
Grégory

Hi,
Apex 4.0 interactive reports and images (Scott's thread)
Have some useful information and pointers to the solution you are looking for.
I hope this help.
Thank you,
Ranish

How to add column in table control for transaction APPCREATE

Hi All,
How can i add the additional column in table control for transaction APPCREATE.
There is structure PT1045_EXT present behind table control. But not found any customer exit or badi to display on screen.
Please help...

You can add new columns
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