Foreign keys at the table partition level
Anyone know how to create and / or disable a foreign key at the table partition level? I am using Oracle 11.1.0.7.0. Any help is greatly appreciated.
Hmmm. I was under the impression that Oracle usually ignores indices on columns with mostly unique and semi-unique values and prefers to do full-table scans instead on the (questionable) theory that it takes almost as much time to find one or more semi-unique entries in an index with a billion unique values as it does to just scan through three billion fields. Though I tend to classify that design choice in the same category as Microsoft's design decision to start swapping ram out to virtual memory on a PC with a gig of ram and 400 megs of unused physical ram on the twisted theory that it's better to make the user wait while it needlessly thrashes the swapfile NOW than to risk being unable to do it later (apparently, a decision that has its roots in the 4-meg win3.1 era and somehow survived all the way to XP).
Similar Messages
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How to create a foreign key for the table from two different tables?
Hi All,
I have a three table like below. In the below table SAMPLE_CONS_CHECK and SAMPLE_CONS2_CHECK will be having the primary key for NAME column. The same SAMPLE_CONS3_CHECK table also having the primary key for NAME column and forieign key for SAMPLE_CONS_CHECK and SAMPLE_CONS2_CHECK tables. See the below code 2
code 1:
CREATE TABLE SAMPLE_CONS_CHECK
(NAME VARCHAR2(10),
SERIES VARCHAR2(5)
CREATE TABLE SAMPLE_CONS2_CHECK
(NAME VARCHAR2(5),
MODEL NUMBER
CREATE TABLE SAMPLE_CONS3_CHECK
(NAME VARCHAR2(5),
MODEL_NO NUMBER
)code 2
alter table SAMPLE_CONS_CHECK
add constraint SAMPLE_CONS_CHECK_pk primary key (NAME)
alter table SAMPLE_CONS2_CHECK
add constraint SAMPLE_CONS2_CHECK_pk primary key (NAME)
alter table SAMPLE_CONS3_CHECK
add constraint SAMPLE_CONS3_CHECK_pk primary key (NAME)
ALTER TABLE SAMPLE_CONS3_CHECK ADD
CONSTRAINT SAMPLE_CONS3_CHECK_FK1 FOREIGN KEY
NAME
) REFERENCES SAMPLE_CONS_CHECK
NAME
) ON DELETE CASCADE;
ALTER TABLE SAMPLE_CONS3_CHECK ADD
CONSTRAINT SAMPLE_CONS3_CHECK_FK2 FOREIGN KEY
NAME
) REFERENCES SAMPLE_CONS2_CHECK
NAME
) ON DELETE CASCADE;From the above schenario i am able to insert the data to SAMPLE_CONS3_CHECK table. But the parent data is already available in the parent table. The problem is here two different constarints from two different tables. While inserting, it is checking from both the tables whether the parent is exist or not.
How can i solve this problem? Can anyone halp me about this?
Thanks
Edited by: orasuriya on Aug 8, 2009 2:02 AMActually the design is completely incorrect.
What you say is
I have
'foo', 'foo series'
'foo','foo model'
'foo',666
By virtue of table3 referring to both table1 and table2.
This means you actually need to have 1 (one) table:
'foo','foo series','foo model', 666
And the 'problem' disappears.
Sybrand Bakker
Senior Oracle DBA -
Two columns in the same table that are foreign keys to the same master key
i want to create a table let say X, which have two columns that are foreign key that reference the same column in the master table, so does this count as bad database design.
here is the full ddl for the two table, where in the second table there are two columns that represent the primary key and they are also two foreign keys to the same columns in the master table (items)
Desc item table;
Item_id
Item_name
Item_price
Item_quantitiy
Create table item_recommendation ( item_id varchar(20), recommended_item varchar(20),
CONSTRAINT recom_primary PRIMARY KEY (item_id, recommended_item),
CONSTRAINT F1 FOREIGN KEY (item_id) REFERENCES items(item_id), ),
CONSTRAINT F2 FOREIGN KEY (recommended_item) REFERENCES items(item_id)); -
how to transfer database table contain null values, primary key, and foreign key to the another database in same server. using INSERT method. thanks
INSERT targetdb.dbo.tbl (col1, col2, col3, ...)
SELECT col1, col2, col3, ...
FROM sourcedb.dbo.tbl
Or what is your question really about? Since you talke about foreign keys etc, I suspect that you want to transfer the entire table definition, but you cannot do that with an INSERT statement.
Erland Sommarskog, SQL Server MVP, [email protected] -
Unable to choose foreign key when creating reference partition
Hello
I have 2 foreign keys on a table. I am trying to choose the 2nd foreign key when creating a reference partition. I am unable to select the required foreign key.
The model has Table A -> Table B -> Table C. Table A has a list partition. Table B is the child of Table A. I created a reference partition on Table B. Table C is child of Table B. There are 2 FKs on table C. I am unable to choose the required FK to create reference partition on table C.
SQL Developer version - 3.0.0.665
Any help would be appreciated.Hi,
The FK that can be selected is normally the oldest FK that was created for the Table.
So one option would be to delete and then recreate the FK that is selectable. This process may need to be repeated if there are several FKs that are "older" than the one you wish to use for Reference Partitioning.
David -
Delete a user from a table whose name is a foreign key in other tables
Dear All;
I am trying to figure out an easy way to do this. I just recently took someone application who utilized 500 tables. I am trying to delete a user from a table called member_table. However, I am having problems doing so because the user name is a foreign key in other tables which has a relationship with this member_table. I really can't naviagte through all 500 different tables and start deleting the user from each table . hence, I would like to figure out a way to delete the user from the member_table without getting the error message
ORA - 02292 "Integrity Constraint (....) violated child record foundUnless you want to find and re-create all of the FK's that point to that field so you can make them ON DELETE CASCADE (note it is the FK not the PK that has that attribute), you will need to either delete that member id from each of the child tables individually or update each one individually to either null or some valid value in member_table before you can delete the id from member_table.
You can find all of the tables, and the corresponding column_name that have an FK relationship to memeber_table with the following:
SELECT c.table_name, col.column_name
FROM user_constraints c, user_cons_columns col
WHERE c.constraint_name = col.constraint_name and
c.r_constraint_name = (SELECT constraint_name
FROM user_constraints
WHERE table_name = 'MEMBER_TABLE' and
constraint_type = 'P') and
c.constraint_type = 'R';If there are a lot of these, you could use something similar to generate the set of delete/update statements that would be needed.
John -
Missing primary foreign key in grandchild table
I have a model with a two inheritance generations.
https://www.dropbox.com/s/4rghqcmxx24bgvt/pf_logical.png
When I engineer all entities everything is fine. The child tables get their primary foreign keys:
https://www.dropbox.com/s/t4v5bexxwdrn5y1/pf_engineered.png
But when I do not engineer the child generation the grandchildren have no primary foreign keys anymore.
https://www.dropbox.com/s/ofl436sm8dua3w8/pf_missing.png
I have expected, that the grandchildren get a primary foreign key to the grandfather. But that is not the case. How can I tell the modeler to engineer such a foreign key?Hi,
thanks for reporting the problem. I logged a bug for that.
Philip -
Determine if database view column is foreign key in underlying table
Hi,
I have posted this same question to the General Database Discussions and JDBC forums.
I am using Oracle database 10g (10.1.0.4.0 - 64 bit production) standard edition on Red Hat Enterprise Linux AS release 3, JDK 1.4.2 and the latest Oracle JDBC (thin) driver.
We have a java GUI application that is a front-end for our database. Some of the data entry screens display data from database views. If a column in the view is a foreign key in the underlying table, we want to display a combo-box with the valid values so that the user can choose a correct value.
Is there some way to know whether a column in a view is a foreign key in the view's underlying table?
Thanks,
Avi.I take that back.. I did figure something out for ya.. After reading some elses post I wrote this code... but its time to go home... I believe this will show you all the constraints and constraint types for the underlying tables of all the views for a user. You can mess with it and get it to return only FK (constraint_type = 'R') and only for a single view if ya like... The all_dependencies data dictionary view is the key to this whole operation...
select con.table_name, ucc.column_name, con.constraint_name, con.constraint_type
from all_constraints con, all_cons_columns ucc
where con.owner = user and
con.owner = ucc.owner and
con.table_name = ucc.table_name and
con.table_name in
(SELECT referenced_name
FROM all_dependencies
WHERE referenced_owner = USER
AND referenced_type = 'TABLE'
AND type = 'VIEW'); -
Table with n foreign key vs n tables or n foreign key vs 1 table?
Hi,
we have a scenario with n tables containing some attributes one table for one category of attribute (es: color, role, type, etc..) of a principal entity and 1 table for the principal entity with n foreign keys vs every attribute table.
Some propose to create a unique table called attributes in which put every attribute with an attributetype for each record.
My question is: the principal entity will have n foreign keys vs the same attribute table. Is this perfomant? which is the best solution?
Thanks in advance.
v.>
we have a scenario with n tables containing some attributes one table for one category of attribute (es: color, role, type, etc..) of a principal entity and 1 table for the principal entity with n foreign keys vs every attribute table.
Some propose to create a unique table called attributes in which put every attribute with an attributetype for each record.
My question is: the principal entity will have n foreign keys vs the same attribute table. Is this perfomant? which is the best solution?
>
Ask those 'Some propose' how a foreign key to the 'same attribute table' will prevent the WRONG value from being used for a column.
1. Principal entity has a column for 'color' and a column for 'role'.
2. There are FKs on the 'color' column and the 'role' column that both point to the 'same attribute table'
3. Legal values for 'color' are: 1, 2, 3
4. Legal values for 'role' are: 10, 20, 30
What prevents someone from updating the 'color' column to a value of 20?
Ask those 'Some propose' how your one attribute table will store attributes that are of different datatypes.
1. 'color' uses numbers: 1, 2, 3
2. 'type' uses strings: 'type1', 'type2', 'type3'
3. 'holiday' uses dates: 12/25/2013, 01/01/2014
How do your 'Some propse' plan to store ALL of those values in one column? They are likely to say they will use VARCHAR2.
Ok - so how do you keep someone from updating 'holiday' to a value of 'type2' or a value of '3'?
You can't easily validate the data to begin with and you can't easily prevent 'dirty' data from getting into the system.
You also can't easily explain to ANYONE, for example new developers, how to properly use and maintain the table.
I haven't heard you mention even ONE potential benefit to doing things the way that 'Some propose'. So - DON'T DO THAT! -
A question about foreign key to multiple tables
Hello everybody,
I have a question about creating foreign key and I would appreciate if you could kindly give me a hand. Here are my tables:
CREATE TABLE TEAM1(team_id VARCHAR2(20), project_id VARCHAR2(20));
ALTER TABLE TEAM1 ADD CONSTRAINT PK_TEAM1 PRIMARY KEY(team_id);
CREATE TABLE TEAM2(team_id VARCHAR2(20), project_id VARCHAR2(20));
ALTER TABLE TEAM2 ADD CONSTRAINT PK_TEAM2 PRIMARY KEY(team_id);although the structure of both the tables is exactly the same, the values (in particular team_id) in both tables are different.
Also I have another table named AGENT
CREATE TABLE AGENT(agent_id VARCHAR2(20), team_id VARCHAR2(20));
ALTER TABLE AGENT ADD CONSTRAINT PK_AGENT PRIMARY KEY(agent_id)Now the problem is that the column team_id in AGENT table is actually a foreign key, but the value can be in either TEAM1 or TEAM2. As far as I know a foreign key points only to one table.
How can I deal with this problem? Whenever there is an INSERT or UPDATE I have to make sure that the value of the column "team_id" in the table "AGENT" is a valid value either in "TEAM1" or "TEAM2"
Thanks in advance,
Kind Regards,
DariyooshDo you have the ability to change the data model? If so a more appropriate structure may be something like this:
CREATE TABLE TEAM(team_id VARCHAR2(20), team_name VARCHAR2(20));
ALTER TABLE TEAM ADD CONSTRAINT PK_TEAM PRIMARY KEY(team_id);
ALTER TABLE TEAM ADD CONSTRAINT UK_TEAM UNIQUE (team_name);
CREATE TABLE TEAM_PROJECT(team_id VARCHAR2(20), project_id VARCHAR2(20));
ALTER TABLE TEAM ADD CONSTRAINT PK_TEAM_PROJECT PRIMARY KEY(team_id, project_id);
ALTER TABLE AGENT ADD CONSTRAINT FK_TEAM_PROJECT1 FOREIGN KEY (team_id) REFERENCES TEAM(team_id);
CREATE TABLE AGENT(agent_id VARCHAR2(20), team_id VARCHAR2(20));
ALTER TABLE AGENT ADD CONSTRAINT PK_AGENT PRIMARY KEY(agent_id);
ALTER TABLE AGENT ADD CONSTRAINT FK_TEAM FOREIGN KEY (team_id) REFERENCES TEAM(team_id);Edited by: Centinul on Jun 25, 2010 10:50 AM -
FOREIGN KEY CONSTRAINT 의 MASTER TABLE NAME 의 확인
제품 : ORACLE SERVER
작성날짜 : 1995-11-02
FOREIGN KEY CONSTRAINT 의 MASTER TABLE NAME 의 확인
===================================================
다음은 FOREIGN KEY CONSTRAINT 이름으로 REFERENCE 하는 TABLE
(MASTER TABLE)을 찾는 SQL SCRIPT이다.
col Primary_key_table format a20
col Constraint_name format a20
select a.object_name Primary_Key_table,
c.name Constraint_name
from dba_objects a,
sys.cdef$ b,
sys.con$ c
where c.name = 'EMP_FOREIGN_KEY' -- CONSTRAINT NAME
and b.con# = c.con#
and b.robj# = a.object_id
/The set of constraints as you show it is valid, but will likely result in a lot of violations since both child columns are larger than the parent. The Oracle 2256 error has nothing to do with data validation, nor with the different lengths of the columns. The documentation says
02256, 00000, "number of referencing columns must match referenced columns"
// *Cause: The number of columns in the foreign-key referencing list is not
// equal to the number of columns in the referenced list.
// *Action: Make sure that the referencing columns match the referenced
// columns.Look at the actual statement that the client ran. It will be different than the one you posted. one of the two column lists will have more columns than the other. -
Foreign keys to same table / Who columns in User table???
Hi All,
We are designing a database for our client and we are using common columns in all tables like CreatedBy and UpdatedBy which are foreign keys to USER table. My question is can we use these two columns in USER table and have the foreign key constraints to the same tables?
USER table script will look like following..
CREATE TABLE XX_USER
User_ID VARCHAR2(10)
, CreatedBy NUMBER(10)
, UpdatedBy NUMBER(10)
, User_Name VARCHAR2(100) NOT NULL
, Designation VARCHAR2(100) NOT NULL
, CONSTRAINT USER_ISACTIVE_CHECK CHECK (Is_Active in ('Y', 'N'))
, CONSTRAINT USER_KEY PRIMARY KEY (User_ID),
, CONSTRAINT USER_CREATED_BY FOREIGN KEY (CREATED_BY)
REFERENCES XX_USER (USER_ID)
, CONSTRAINT USER_UPDATED_BY FOREIGN KEY (UPDATED_BY)
REFERENCES XX_USER (USER_ID)
);I think what I am doing (the above script) is not correct. Could someone please suggest me how can solve this issue?
Thanks in advance,
Oraebsuser8644385 wrote:
We are designing a database for our client and we are using common columns in all tables like CreatedBy and UpdatedBy which are foreign keys to USER table. My question is can we use these two columns in USER table and have the foreign key constraints to the same tables?You can. After fixing synatx errors:
SQL> CREATE TABLE XX_USER
2 (
3 User_ID VARCHAR2(10)
4 , CreatedBy NUMBER(10)
5 , UpdatedBy NUMBER(10)
6 , User_Name VARCHAR2(100) NOT NULL
7 , Designation VARCHAR2(100) NOT NULL
8 , Is_Active VARCHAR2(1)
9 , CONSTRAINT USER_ISACTIVE_CHECK CHECK (Is_Active in ('Y', 'N'))
10 , CONSTRAINT USER_KEY PRIMARY KEY (User_ID)
11 , CONSTRAINT USER_CREATED_BY FOREIGN KEY (CreatedBy)
12 REFERENCES XX_USER(USER_ID)
13 , CONSTRAINT USER_UPDATED_BY FOREIGN KEY (UpdatedBy)
14 REFERENCES XX_USER(USER_ID)
15 )
16 /
Table created.
SQL> Now USER_ID is a string while CreatedBy/UpdatedBy is a number. Even though it is allowed, it limits USER_ID to numeric strings and causes implicit conversions while validating. So I would change CreatedBy/UpdatedBy data type to VARCHAR2(10).
SY. -
Update primary key thats also a foreign key in another table
Hi Developers,
I need to update the primary key for a record but it's also the foreign key in another table.
Example,
Table 1 Details
Name : Parent_Table
Columns : ID, Name, Age
Primary Key : ID
Table 2 Details
Name : Child_Table
Columns : ID, Parent_ID, Name, Age
Primary Key : ID
Foreign Key : Parent_ID (Primary Key in Parent_Table)
Parent_Table
ID Name Age
1001 Sam 26
1002 George 25
Child_Table
ID Parent_ID Name Age
1010 1001 Sam 26
1020 1002 George 25
Now I want to update ID (1001) in Parent_table as 2001 and also, I want to update Parent_ID (1001) in Child_Table as 2001.
How we will write the java code to update these columns.
Thanks in advance.dcminter wrote:
If you're looking at changing the primary keys in your data then there's probably something wrong with your data structure.Depends how you feel about business primary keys versus surrogates. Personally I prefer the latter so I'm with you in theory. In practice, however, a DB that uses a business PK may well find that it's a legitimate use case to change the key value (but then that's why I like surrogates in the first place!)Primary keys should not have meaning. -
FOREIGN KEY CONSTRAINT의 MASTER TABLE을 REFERENCE하는 TABLE 찾기
제품 : SQL*PLUS
작성날짜 : 2003-12-17
FOREIGN KEY CONSTRAINT의 MASTER TABLE을 REFERENCE하는 TABLE 찾기
================================================================
Master table 이 dept2일 때, 이 테이블을 참조하는 table들을 찾는 SQL
select x.table_name "reference table"
from
(select distinct r_constraint_name,table_name
from all_constraints
where constraint_type='R' ) x, all_constraints a
where a.table_name = 'DEPT2'
and x.r_constraint_name = a.constraint_name; -
Create index partition in the table partition tablespace
Hello,
I am running a custom job that
* Creates a tablespace daily
* Creates the daily table partition in the tablespace created
* Drops the tablepartition X days old
* Drops the tablespace for that partition on X+1 day.
The above job runs perfectly, but 'm having issues with managing the indexes for these partitioned tables. In the old database (10g - Single Node), all the partitions/indexes existed in one BIG tablespace and when I imported the table creation script into the new database, I modified all the table partitions & indexes to go into their respective tablespace.
Eg:
Table_name........Partition_name.....................Index_Part_name..........................Tablespace_name
============...================............====================...........=================
TABL1...................TABL1_2012_07_16............TABL1_IDX_2012_07_16............TBS_2012_07_16
TABL1...................TABL1_2012_07_15............TABL1_IDX_2012_07_15............TBS_2012_07_15
But now when the job runs, it creates the index into the default tablespace TBS_DATA.
Table_name........Partition_name.....................Index_Part_name..........................Tablespace_name
============...================.............====================...........=================
TABL1...................TABL1_2012_08_16............TABL1_IDX_2012_08_16............TBS_DATA
TABL1...................TABL1_2012_08_15............TABL1_IDX_2012_08_15............TBS_DATA
I can issue alter index rebuild to move the indexes to its default tablespace, but how can I ensure that the index gets created in its designated tablespace?
NOTE - the partition/tablespace management job that I run only creates the table partition and not the index.
The new env is a 2-Node 11gR2 RAC cluster on Linux x86_64.
Thanks in advance,
aBBy.Excerpt from the job -
This creates the partition into the new tablespace.
v_sql_new_part := 'alter table '||tab_owner||'.'||tab_name||' add partition '||v_new_part_nm||'
values less than (to_date('''||v_new_part_dt_formatted||''',''DD-MON-YYYY'')) tablespace '||part_tbs;
execute immediate v_sql_new_part;New tablespace for new partition - because this is a 10T database and having multiple tablespaces helps with backup/recovery.
Thanks,
aBBy.
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