DEFAULT Value On Columns?
Mar 24, 2011
I wanted to know the consequences of adding a DEFAULT value to an existing column in a table.I understand that when you add a DEFAULT value to a column which is Nullable, Oracle updates all the null values for the column to the DEFAULT value, generating a lot of undo/redo data.
Is adding a DEFAULT value to a NOT NULL column a problem? As the column is NOT NULL, an update would not be done, so no undo/redo data will be generated.But will this cause a whole table scan? Is this advisable?
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Apr 27, 2010
I have the following procedure...
CREATE OR REPLACE Procedure Updatetdef_normal_ranges (
i_tdef_range_id in number,
i_user_change_id in number default -1,
i_norm_range_low in number default NULL,
[Code]....
EXCEPTION
WHEN OTHERS THEN raise_application_error(-20001,'An error was encountered - '||SQLCODE||' -ERROR- '||SQLERRM); END Updatetdef_normal_ranges;
I am trying to execute it using the command
Execute Updatetdef_normal_ranges (i_tdef_range_id => 1, i_norn_range_high => 100.34, i_high_reflex_tdef_id => 100, i_low_reflex_tdef_id => 17, i_range_low_sched => -1)
and I am getting the following error...
SQL> Execute Updatetdef_normal_ranges (i_tdef_range_id => 1, i_norn_range_high => 100.34, i_high_reflex_tdef_id => 100, i_low_reflex_tdef_id => 17, i_range_low_sched => -1);
BEGIN Updatetdef_normal_ranges (i_tdef_range_id => 1, i_norn_range_high => 100.34, i_high_reflex_tdef_id => 100, i_low_reflex_tdef_id => 17, i_range_low_sched => -1); END;
*
ERROR at line 1:
ORA-06550: line 1, column 7:
PLS-00306: wrong number or types of arguments in call to
'UPDATETDEF_NORMAL_RANGES'
ORA-06550: line 1, column 7:
PL/SQL: Statement ignored
If I replace the update statement with dbms_output statement this procedure works fine.
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Mar 22, 2011
We are trying to add 2 columns in a partitioned table.but we are getting below error:
SQL Error: ORA-39726: unsupported add/drop column operation on compressed tables
But, it is not a compressed table.
select table_name, compression from user_tables
where table_name ='SVC_ORDER_CODE_FACT'
TABLE_NAME COMPRESSION
------------------------------ -----------
SVC_ORDER_CODE_FACT
actually we are trying to add 2 columns as below:
ALTER TABLE SVC_ORDER_CODE_FACT
ADD (MKT_FEATURE_KEY NUMBER default '-2', PREV_MKT_FEATURE_KEY NUMBER default '-2');
But, if we add column without default value,
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Aug 18, 2011
i am practicing to get Dynamic columns as i have learnt from Orafaq SQL/PLSQL forum .i am using Default EMP table...first one is running smoothly as below:
1 DECLARE
2 v_sql VARCHAR2(32767);
3 v_refcur SYS_REFCURSOR;
4 BEGIN
5 v_sql := 'SELECT deptno ';
[code]....
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Jun 12, 2012
Env: APEX 4.1
For example, initially I created the reprot source as select c1, c2, c3 from t; later I added c4. But i was unable to figure out how to make c1, c2, c3, c4 become default displayed columns. I always have to click Action -> Select Columns, then move C4 from "Do not Display" to "Display in Report".
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Nov 16, 2010
I was looking for a way to see if a default value for a procedure was passed NULL or it got NULL by default. [URL]
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Jun 16, 2010
I want to create a report by using one field and one text as columns name in layout but display the all the columns. I mention the 5 column names in query.how can I write function in summary column.
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Apr 4, 2011
I am running a fairly busy Oracle 10gR2 DB, one of the tables has about 120 columns and this table receives on average 1500 insertions per second. The table is partitioned and the partitioning is based on the most important of the two timestamp columns. There are two timestamps, they hold different times.
Out of these 120 columns, about 15 need to be indexed. Out of the 15 two of them are timestamp, at least one of these two timestamp columns is always in the where clause the queries.
Now the challenge is, the queries we run can have any combination of the 13 other columns + one timestamp. In reality the queries never have more than 7 or 8 columns in the where clause but even if we had only 4 columns in the where clause we would still have the same problem.
So if I create one concatenated index for all these columns it will not be very efficient because after the 4th or 5th column the sorting would no longer be very useful and I believe the optimiser would simply not use the rest of the index. So queries that use the leading columns of the index in sequence work well, but if I need to query the 10th column the I have performance issues.
Now, if I create multiple single column indexes oracle will have to work a lot harder to maintain all these indexes and it will create performance issues (I have tried that). Besides, if I have multiple single column indexes the optimiser will do nested loops twice or three times and will hit only the first few columns of the where clause so I think it will kind of be the same as the long concatenated index.
What I am trying to do is exactly what the Bitmap index would do, it would be very good if I could use the AND condition that a Bitmap index uses. This way I could have N number of single column indexes which the optimiser could pick from and serve the query with exactly the ones it needs. But unfortunately using the Bitmap index here is not an option given the large amount of inserts that I get on this table.
I have been looking for alternatives, I have considered creating multiple shorter concatenated indexes but this still would not address the issue since many queries would still not be served properly and therefore would take a very long time to complete.
What I had in mind would be some sort of multidimensional index, I am not even sure if such thing exists. But essentially it would be some sort of index that could serve a query efficiently regardless of the fact that the where clause has the 1st, 3rd and last columns of the index.
So considering how widely used Oracle is and how many super large databases there are out there, this problem must be common.
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Jan 21, 2011
I have a two question.
Question 1:How to select all columns from table except those columns which i type in query
Question 2:How to select all columns from table where all columns are not null without type each column name which is in empty data
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Jul 12, 2012
I have 8 columns. Some of them might be null.I want to display all 8 columns in my result. Not null columns will be first and null at the end.Here is a sample data :
Employee table :
Employee_id Emp_fname emp_lname emp_mname dept salary emp_height emp_weight
1 aaa ddd d1 100 6 180
2 bbb ccc 120 169
3 dfe d2 5.9 223
The expected result is :
result1 result2 result3 result4 result5 result6 result7 result8
1 aaa ddd d1 100 6 180
2 bbb ccc 120 169
3 dfe d2 5.9 223
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Feb 21, 2013
I want to use default value in pl/sql , i'm executing below code
SET serveroutput ON
DECLARE
l_deptno INTEGER DEFAULT 10;
v_dname VARCHAR2(200);
[Code]...
SQL> @test.sql
Enter value for deptno: 40
dname value=OPERATIONS
I tried with NULL to use its default value but it uses NULL(which does make sense)
SQL> @test.sql
Enter value for deptno:
error
How to use the default value of the passed argument?
expected O/P
dname value=ACCOUNTING
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Nov 4, 2011
During the Table Creation if it possible to Use the SYSDATE is Default Value for a Column.
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Mar 27, 2013
I'm using apex 4.2 with Weblogic server. Right now our url to the application is
[URL].......
How can we make it much more simpler like
[URL].......
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Jul 11, 2007
how do I add a column to an existing table which when rows are added to the table this column will have the same default value?
alter table thetable add (new_column_name varchar2(100) default bbubu);
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Aug 30, 2010
How to set default value of particular column of a table ?
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Nov 2, 2011
I am working on forms 6i. I have set where condition in pre-query of a trigger, my requirement is, in post-query, i want to delete the where condition.
pre-query:
set_block_property('HEADER_S',default_where,'STATUS IN (select meaning from XXSMCQSS_LOOKUP_VALUES where lookup_type=''CONCESSION STATUS CODES'' and primary_flag=''N'' )');
post_query: I want to delete this where condition, i just want make execute query normal by removing the where condition.
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May 10, 2012
I have a table with Date Field . While selecting the records its display like below format.
TO_CHAR(CHAR_DATE,'DD-MM-RRRRHH:MI:SSAM')
10-05-2012 12:00:00 AM
10-05-2012 03:26:16 PM
1 row doesnt have time, but in default it shows 12:00:00 AM, how to eliminate it. Display should be
10-05-2012
10-05-2012 03:26:16 PM
create table time_test (char_date date);
INSERT INTO TIME_TEST ( CHAR_DATE ) VALUES (
TO_Date( '05/10/2012', 'MM/DD/YYYY HH:MI:SS AM'));
INSERT INTO TIME_TEST ( CHAR_DATE ) VALUES (
TO_Date( '05/10/2012 03:26:16 PM', 'MM/DD/YYYY HH:MI:SS AM'));
COMMIT;
select TO_char(CHAR_DATE,'dd-mm-rrrr HH:MI:SS AM') from time_test;
i need in to_char only, im using it in reports
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Apr 18, 2013
In my point of view, deferral FK (DFK) are stronger than non-deferral FK (NDFK). In other words, every NDFK can be moved to DFK. Is there a performance issue ?
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Apr 30, 2013
What is By Default Buffer size in Oracle ......?
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Aug 3, 2013
I want to make default 'y' for COL1 how should i make it.1) "COL1" NCHAR(10) DEFAULT N'y'or 2) "COL1" NCHAR(10) DEFAULT 'y' yours sincerly
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Oct 2, 2013
I am trying to find out if there is a definite way to find out (by querying database) which database users have been created by Oracle (either during installation or as part of patching or adding new feature) and which database users have been created by DBAs.
I have looked into the documentation but could not find anything relevant. Ideally, I would like to know if this can be done for any versions starting from 9iR2.
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Jul 12, 2013
Query that I want to run:
exec DBMS_METADATA.SET_TRANSFORM_PARAM(DBMS_METADATA.SESSION_TRANSFORM,'SEGMENT_ATTRIBUTES', false);
result: E;;45;45 ;45 ;45 ;S 45
I am not sure but may be I need to set long size before running above query. But when I try to set long size gives below error. "The output from DBMS_METADATA.GET_DDL is a LONG datatype. When using SQL*Plus, your output may be truncated by default. Issue the following SQL*Plus command before issuing the
DBMS_METADATA.GET_DDL statement to ensure that your output is not truncated:"SQL> SET LONG 9999error: Unhandled SET statement: "SET LONG 9999"
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Aug 10, 2010
I would like to know the reason why the database is on unencrypted format by default,there must be some reason behind this, i hear from someone that encrypted data degrade performance thats the reasons its on unencrypted format by default.
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Oct 22, 2008
I am using Forms 6i.I have a Radio Group, where in I have specified Intial value for it. Previously it was populating properly, But when I have added some code to fix a bug. The radio group starts behaving strange. It doesnt show defaulted value.The code what i put is not even related to the radio group.
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Oct 26, 2009
I would like to add a constraint "default value" for a table column, with a name.
I know how to do it for a constraint "not null" : ALTER TABLE tablename MODIFY columnname CONSTRAINT constraintname NOT NULL;
But I don't know how to do it for a constraint "default value".How can I do ?
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Sep 14, 2003
I Just got Oracle 9i installed. But can not login . What are the Default username and password for "Oracle9i Discoverer Administrator" and other Developers Suite apps?
Also What URL should i type to access the "iSQL *PLUS" through my browser, so that i can execute my SQL statements.
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Apr 3, 2012
I have the following Stored Procedure:
CREATE OR REPLACE PROCEDURE AFESD.TEST_PROC (I_NUM IN NUMBER,
I_NUM2 IN NUMBER DEFAULT 3, D_DATE IN DATE DEFAULT sysdate,D_OUT OUT DATE)
IS
[Code]....
I dont know what I need to pass in order to give it the default value.
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Jun 24, 2010
How can we find the temporary tablespace and default tablespace names.
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May 25, 2010
Is there any property that can be set at design time or dynamically altered during runtime about the default mode in which a form opens? I have created a new FORM in Forms 6i and it opens in the Enter-Query mode. I do not want to open it in the Enter-Query mode. This is because I will be doing my own execute_query on some click of a button in the form. How do I alter this Enter-Query mode in which the form opens?
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May 28, 2012
I have a table as below. This table is not partitioned.
create table t1
(
d1 date,
n1 number not null
);
[Code]....
I took an export dump of the above table and after that I renamed the table t1 to t1_old. Then I recreated the table as below with a default constraint on d1 field.
create table t1
(
d1 date default to_date('01/01/1100','DD/MM/YYYY','NLS_CALENDAR=GREGORIAN'),
n1 number not null
[Code]....
But the problem here is the data import is taking too much time than what I expected. I can't afford a maxvalue partition here as of my DBA team mentioned if you add maxvalue partition adding partition later in a stage is difficult on this table
apply in this scenario and make the import faster. I am using oracle 10.2.0.1.0 version.
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