ENQ: TX - conflict in line for the foreign key lock

Hi all

My DB is 11.2 exadata machine.

I've got to get a case and don't know how to explain it.

session 1:

create the parent table)
ID number primary key);
create the child table)
parent references ID number,
name varchar2 (20));
insert into values parent (3);

session 2:
Insert children values (3, 'aa');

Session 2 crashes.

I'm curious to know how oracle knows that 3 in the parent table can be inserted? Otherwise, why not oracle comes throwing ORA - 02291:parent key is not immediately that I have ' insert into child values (3, 'aa');

Best regards
Leon

user6806750 wrote:
>
So I agree with the OP: the second operation should immediately receive the error 'parent does not exist', instead of block.
>

How about this scenario
Session 1:

1. insert into parent(id) values (3);
2. commit;
3. delete from parent where id = 3

Session 2:

1. insert into child values (3,'aa');

What a result for the session 2 you expect in this case?

Let me repeat a sentence of my previous post:
Theoretically, the general rule is that account required to a SQL statement (whose key foreign is just one particular case) two different operations should only be serialized when both transactions run a kind of DML statement that could be contrary to the assertion.

Now give me a scenario where two operations in effect running a kind of DML which could be contrary to the assertion of FK:
-session 1 deletes a parent, which could be contrary to the assertion of FK because there may be child-lines 'under' parent.
-session 2 inserts a child, which could be contrary to the assertion of FK because there could be a mother line for that child.

ERGO: sessions 1 and 2 in your scenario above must be serialized.

Still once, this was not the case in the scenario of the OP: FK assertiveness could never be breached by what session 1 (insert a new parent).

>
I don't see what that has to do with "modes of locking for insert, update, delete statements" (what do you mean by there btw?)
>
Thus,.
Oracle of the second session always will go, lock in exclusive mode the entry created in the child table and then try to check for the presence of record in the parent table by reading it in shared mode (why reading is in shared mode must be clear from the scenario described above). Because the parent record is locked in exclusive mode, it cannot hold a shared lock, so he waits. So, if we need a different result if the first session of the insertions and deletions a record, Oracle, stumbled on the lock, you need to know what type of operation has led to the blocking.
Something like that...

The problem with the implementation of the Oracle of the assertion of FK is it locks data to serialize an assertion of the FK validation.
Theoretically, this is the wrong approach. When dealing with simultaneous transactions and validation of constraints in several rows, it should return a predicate to first lock and then read the other rows (without lock somehow) to validate the assertion. Scientific research for this return began in the 1970s: http://dl.acm.org/citation.cfm?id=360369

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    Export file created by EXPORT: V11.02.00 direct

    import in US7ASCII and AL16UTF16 NCHAR character set

    import server uses WE8MSWIN1252 (possible character set conversion) character set

    Customer export uses the (possible character set conversion) WE8MSWIN1252 character set

    . import of objects in SHARMA SHARMA

    . . import of partition "CONT_EMP": "P1" 4000 imported lines

    . . import of partition "CONT_EMP": "P2" 5000 imported lines

    . . import of partition 'CONT_EMP': 'P3' 5000 imported lines

    . . "DEPT" table import 12 lines imported

    . . import of table 'EMP' 68278 imported lines

    . . importing table "EMP_AUDIT" 4 imported lines

    . . table 'Method' import 68000 lines imported

    . . importing table "EMP_PERS_INFO" 68278 imported lines

    . . importing table "EMP_PROJ_INFO" 68278 imported lines

    . . table 'LOGTAB' import 603 lines imported

    . . table import "PAYROLL" 186282 imported lines

    . . import of table 'of the PROJECT"22 rows imported

    . . importation of "TAB1" 4000000 imported table rows

    . . table import 'TRANSPORT' 0 rows imported

    IMP-00017: statement failed with error ORACLE 1031:

    'ALTER TABLE 'EMP' ADD 'EMP_EMPLEV_C12_FK' OF CONSTRAINT FOREIGN KEY ("EMP_LEVE" '.

    ""L") REFERS TO"SCOTT" CATEGORY"("GRADE_NAME") ENABLE NOVALIDATE.

    IMP-00003: ORACLE error 1031

    ORA-01031: insufficient privileges

    About to activate the constraints...

    IMP-00017: statement failed with error ORACLE 2430:

    ' ALTER TABLE 'EMP' ENABLE CONSTRAINT "EMP_EMPLEV_C12_FK"

    Import completed successfully with warnings.

    30, 31 line number is display error.

    'ALTER TABLE 'EMP' ADD 'EMP_EMPLEV_C12_FK' OF CONSTRAINT FOREIGN KEY ("EMP_LEVE" '.

    ""L") REFERS TO"SCOTT" CATEGORY"("GRADE_NAME") ENABLE NOVALIDATE.

    After the import operation, to recreate the foreign key is the right option. but

    By performing the import operation, how can all I avoid this error dump file or log file?

    I don't want to use constraints = N.


    Thanks in advance


    You gave * of * SCOTT * at * SHARMA.  The grant received by SHARMA not getting exported when you export SHARMA.  So, it is not imported when you import SHARMA.  If you did an export and import of SCOTT before SHARMA, the award of the cross-schema would have also been imported.  (Subsidies granted by a user are exported with the user, the subsidies received by a user are not exported with the user).

    Hemant K Collette

  • Add the foreign key refers to a different schema

    Hello

    We have a database with schemaA and schemaB and we use a data model for schemaA with SQL Data Modeler.

    Our data model is based on SchemaA and we do not want add schemaB or create subview in our current model for schemaB since our dev team do not want schemaB in the model

    We have created a synonym in tableB schemaB shcemaA after granting select them, references to schemaA

    We have added a foreign key on tableA in referencing TableB on schemaB schemaA.

    for example. Add ALTER table tableA foreign constraint key(column-name) references tableB(colum-name)

    So far so good.

    But if we try to produce the DDL for tableA it has not provided the ALTAR of the foreign key that is based on shcmeaB

    We know that we cannot add foreign key on dblinks.

    How can I get the Modeler DDL from SQL data for tableA, including the foreign key

    We appreciate the answers

    Kind regards

    Zafar

    Hi zak,.

    We have created a synonym in tableB schemaB shcemaA after granting select them, references to schemaA

    We have added a foreign key on tableA in referencing TableB on schemaB schemaA.

    You can do it in the database because TableB exists in the database and DB knows its definition, including the existing constraint of PK/UK.

    This is the same model of data Modeler - you must have the definition of the table referenced in order to create the FK that refer to the constraint of PK/UK.

    As it works now (we can change it) you can have modeled for SchemaA and ModelB for SchemaB. Then, you can drag & drop tableB form the Navigator to the diagram of the ModelA and TableB there will exist as an object remote read-only, you can use to create the FK.

    With the help of subviews, DDL generation and configurations of reports, you can display the dev team than objects that they want to see - on the charts in generated DDL and reports.

    Philippe

  • Rename the foreign key constraint

    Hello

    I have table tbl_a with a column a_col1 SEO tbl_b.b_col1

    I want to create the name of the foreign key as FK_A_COL1 constraint which is FK_ < COLUMN NAME OF the CHILD >.

    Foreign naming key standards does not have the use of the name of the child under the name column.

    Is there any other solution/script to achieve this?

    Thank you.
    fkeys = model.getFKIndexAssociationSet().toArray();
    for (var i = 0; i;//also can use fk.getTable().getAbbreviation()fkname = "FK_"+fk.getTable().getName();cols = fk.getColumns();for( var k = 0;k
    
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
    
  • Identify the foreign key table

    I have a table that has a few constraints that are foreign keys to other tables (see column FK_ETHNIC below). My naming conventions are consistent so they all start with 'FK_ ". In SQL, how can I find the table that the foreign key column references? I have a process that must find this table and then get all of its columns.
    Thank you!

    CREATE TABLE STU_BASE
    (PK_ID VARCHAR2 (32), sys_guid() by default)
    CONSTRAINT pk_stu_base
    KEY ELEMENTARY SCHOOL
    With the HELP of INDEX TABLESPACE sis_express_index
    STORAGE (INITIAL 524288
    NEXT 524288
    PCTINCREASE 0),.
    STUDENT_ID VARCHAR2 (15).
    Fk_stu_base_ethnic FK_ETHNIC VARCHAR2 (32) CONSTRAINT
    REFERENCES
    Ethnic (PK_ID)
    REMOVE THE NULL VALUE;

    CREATE TABLE ETHNIC
    (PK_ID VARCHAR2 (32), sys_guid() by default)
    CONSTRAINT pk_ethnic
    KEY ELEMENTARY SCHOOL
    With the HELP of INDEX TABLESPACE sis_express_index
    STORAGE (4096 INITIAL
    NEXT 4096
    PCTINCREASE 0),.
    VARCHAR2 (2) ETHNIC,.
    ETHNIC_DESC VARCHAR2 (30),
    STATE_CODE VARCHAR2 (2),
    FEDERAL_CODE VARCHAR2 (2))

    You could do a self-join with CONSTRAINTS (USER, ALL, s/n) views. You can search a constrainttype of 'R' and you can attach it to itself based on the R_OWNER and R_CONSTRAINT_NAME columns.

    For example:

    SELECT r1.owner      AS child_owner
         , r1.table_name AS child_table
         , r2.owner      AS parent_owner
         , r2.table_name AS parent_table
    FROM   all_constraints r1
    JOIN   all_constraints r2 ON  r2.owner           = r1.r_owner
                              AND r2.constraint_name = r1.r_constraint_name
    WHERE  r1.constraint_type = 'R'
    ;
    

    Published by: Centinul on February 16, 2012 15:36

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