Potential problems for tables without primary keys and unique keys

GoldenGate 11.2.1.0.3/Solaris 10
DB: Oracle for Oracle (Source and target is 11.2.0.3)
Topology: unidirectional


In our one-way configuration GG, little of the tables being replicated is not a primary key or a Unique key.

Last week when we have implemented GG for the test, we received warnings for these table below.
GGSCI > add trandata WMHS_UD.crtn_dtl

2013-01-12 11:34:33  WARNING OGG-00869  No unique key is defined for table 'CRTN_DTL'. All viable columns will be used to represent the key, but may not guarantee uniqueness.  KEYCOLS may be used to define the key.

Logging of supplemental redo data enabled for table WMHS_UD.crtn_dtl.
Replication seems to work very well for these tables.

Googling, I think that there may be performance degradation when you replicate tables without PK or the United Kingdom.

But are there other potential problems such as data of a certain kind not replicated to the lack of PK/UK?

It really depends on the data.

By default, GG is combining all columns as a virtual primary key but don't no conflict control by default. So when you can be sure that the record you insert into the table is unique, then it will work.
BUT as soon as you insert the same record, which is already inserted, then you will encounter problems.

Let me show what happens when you use an initial charge because it makes it easier to describe:
We start at 10:00 the capture for a table. Now, you insert a record at 10:00 in the tables. When you now start an initial charge to 10.02, then check you have inserted in the database to 10.01 will be repeated two times. During the IPL as the initial charge is made to 10.02 and it includes data of 10.01 AND it will be replicated again through the process of capture/replicate.

Tags: Business Intelligence

Similar Questions

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    COLUMN A.     COLUMN B |    COLUMN C

    PAID NUMBER DESCRIPTION

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    18515S15-875 blabla1

    215526.52 blabla2 D17-517

    ...                               ...                           ...

    TABLE 2

    COLUMN D |     COLUMN E |    COLUMN F

    INVOICENUMBERDESCRIPTION

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    But as you can see, you can pay in several times and there may be several invoices.

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    S15-875 185525 33987 blabla1

    D17-517 blabla2 167484 215526.52

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  3    union all select 18515     as paid, 'S15-875' as "NUMBER", 'blabla1' as description from dual
  4    union all select 215526.52 as paid, 'D17-517' as "NUMBER", 'blabla2' as description from dual
  5    )
  6  , table_2 as
  7    (         select 185525    as invoice, 'S15-875' as "NUMBER", 'blabla1' as description from dual
  8    union all select 158520    as invoice, 'D17-517' as "NUMBER", 'blabla2' as description from dual
  9    union all select 8964      as invoice, 'D17-517' as "NUMBER", 'blabla2' as description from dual
 10    )
 11  select t1."NUMBER"     as "NUMBER"
 12  ,      t1.description  as description
 13  ,      ( select sum(t2.invoice) from table_2 t2 where t2."NUMBER" = t1."NUMBER" ) as invoice
 14  ,      sum(t1.paid)    as paid
 15  from   table_1 t1
 16  group by t1."NUMBER"
 17  ,        t1.description
 18  /

NUMBER  DESCRIP    INVOICE       PAID
------- ------- ---------- ----------
D17-517 blabla2     167484  215526.52
S15-875 blabla1     185525      33987

    BTW: 'NUMBER' is a horrible name for a column. I strongly recommend to change something that is not a reserved word.

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    Please paste a small example too.

    Thank you
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    Hello

    I have a concrete example of this issue, I tested in my environment. Please follow the steps below to install this on your databases.

    My global_name to database source is: REP102A. WORLD
    My global_name to database target is: REP102B. WORLD

    Source table: ORDERS. ORDER_ENTRY
    Target Table: MERCHANT NAVY. ORDER_ENTRY

    Replication will happen as follows:
         
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    Needs to follow the steps below as the one proposed at each site. You may need to make the changes required for your environment.

    SCRIPT:
    =======

    * 1. Remove the configuration of the flow of SOURCE and TARGET sites: *.

    CONNECT / as SYSDBA
    RUN DBMS_STREAMS_ADM. REMOVE_STREAMS_CONFIGURATION;
    DROP USER CASCADE STRMADMIN;

    * 2. Installation STRMADMIN user and streams queued on the Source database: *.

    CONNECT / as sysdba
    Strmadmin CREATE USER IDENTIFIED BY strmadmin;
    GRANT dba, connect, resource, aq_administrator_role to strmadmin;
    ALTER SYSTEM SET aq_tm_processes = 1;
    BEGIN
    DBMS_STREAMS_AUTH. () GRANT_ADMIN_PRIVILEGE
    dealer-online "strmadmin."
    grant_privileges => TRUE);
    END;
    /

    CONNECT strmadmin/strmadmin
    BEGIN
    DBMS_STREAMS_ADM. () SET_UP_QUEUE
    queue_table-online "streams_queue_table."
    queue_name-online "streams_capture_queue."
    queue_user-online "strmadmin");
    END;
    /

    * 3. Installation STRMADMIN user and streams queued to the database target: *.

    CONNECT / as sysdba
    Strmadmin CREATE USER IDENTIFIED BY strmadmin;
    GRANT dba, connect, resource, aq_administrator_role to strmadmin;
    ALTER SYSTEM SET aq_tm_processes = 1;
    BEGIN
    DBMS_STREAMS_AUTH. () GRANT_ADMIN_PRIVILEGE
    dealer-online "strmadmin."
    grant_privileges => TRUE);
    END;
    /

    CONNECT strmadmin/strmadmin
    BEGIN
    DBMS_STREAMS_ADM. () SET_UP_QUEUE
    queue_table-online "streams_queue_table."
    queue_name-online "streams_apply_queue."
    queue_user-online "strmadmin");
    END;
    /

    * 4. Create ORDERS. ORDER_ENTRY Table on the Source database: *.

    CREATE USER controls IDENTIFIED BY;
    GRANT connect, resource TO arrested;
    CONNECT orders/orders

    CREATE THE ORDERS TABLE. ORDER_ENTRY
    (
    order_id number (8) primary key,.
    ORDER_ITEM varchar2 (30),
    ship_no number (8)
    );

    * 5. Create shipping. Target ORDER_ENTRY Table on the database: *.

    CREATE USER IDENTIFIED BY expedition expedition;
    GRANT connect, navigation resources;
    CONNECT shipping/delivery

    CREATE TABLE EXPEDITION TO FRANCE. ORDER_ENTRY
    (
    order_id number (8) primary key,.
    ORDER_ITEM varchar2 (30),
    ship_no number (8)
    );

    * 6. On the target, add the rules to apply and create a dblink from destination to source: *.

    CONNECT strmadmin/strmadmin
    SET SERVEROUTPUT ON
    DECLARE
    v_dml_rule VARCHAR2 (80);
    v_ddl_rule VARCHAR2 (80);
    BEGIN
    DBMS_STREAMS_ADM. () ADD_TABLE_RULES
    table-name => ' EXPEDITION. ORDER_ENTRY',.
    streams_type-online "apply."
    streams_name-online "streams_apply."
    queue_name-online "strmadmin.streams_apply_queue."
    include_dml to-online true.
    include_ddl-online fake,
    include_tagged_lcr-online fake,
    source_database => ' REP102A. WORLD ',.
    dml_rule_name-online v_dml_rule,
    ddl_rule_name-online v_ddl_rule,
    inclusion_rule-online true);
    DBMS_OUTPUT. Put_line (' apply rule DML for SHIPPING.) ORDER_ENTRY => ' | v_dml_rule);
    END;
    /

    CREATE DATABASE LINK rep102a.world CONNECT TO strmadmin IDENTIFIED BY strmadmin USING 'rep102a ';
    -check the link works with:
    SELECT * from [email protected];

    BEGIN
    DBMS_APPLY_ADM. () ALTER_APPLY
    apply_name-online "streams_apply."
    apply_user-online "strmadmin");
    END;
    /

    * 7. The source adds the rules of capture, transformation, create a database link for target, add spread rules, then prepare the tables for instantiation: *.

    CONNECT strmadmin/strmadmin
    SET SERVEROUTPUT ON
    DECLARE
    v_dml_rule VARCHAR2 (80);
    v_ddl_rule VARCHAR2 (80);
    BEGIN
    DBMS_STREAMS_ADM. () ADD_TABLE_RULES
    table-name => ' ORDERS. ORDER_ENTRY',.
    streams_type-online "capture."
    streams_name-online "streams_capture."
    queue_name-online "strmadmin.streams_capture_queue."
    include_dml to-online true.
    include_ddl-online fake,
    include_tagged_lcr-online fake,
    source_database => ' REP102A. WORLD ',.
    dml_rule_name-online v_dml_rule,
    ddl_rule_name-online v_ddl_rule,
    inclusion_rule-online true);
    DBMS_OUTPUT. Put_line ('Capture DML rule for ORDERS.) ORDER_ENTRY => ' | v_dml_rule);
    -Add the schema to rename it to change ORDERS to NAVIGATION for this rule
    DBMS_STREAMS_ADM. () RENAME_SCHEMA
    nom_regle-online v_dml_rule,
    from_schema_name-online "ORDERS."
    to_schema_name-online 'EXPEDITION. "
    operation => "ADD");
    END;
    /

    CREATE DATABASE LINK rep102b.world CONNECT TO strmadmin IDENTIFIED BY strmadmin USING 'rep102b ';
    -check the link works with:
    SELECT * from [email protected];

    -post-harvest enqueues the LCR will have schema as EXPEDITION via renamed of schema processing
    -then add the rule of propagation for SHIPPING. ORDER_ENTRY

    SET SERVEROUTPUT ON
    DECLARE
    v_dml_rule VARCHAR2 (80);
    v_ddl_rule VARCHAR2 (80);
    BEGIN
    DBMS_STREAMS_ADM. () ADD_TABLE_PROPAGATION_RULES
    table-name => ' EXPEDITION. ORDER_ENTRY',.
    streams_name-online "streams_prop."
    source_queue_name-online "strmadmin.streams_capture_queue."
    destination_queue_name-online "[email protected]."
    include_dml to-online true.
    include_ddl-online fake,
    include_tagged_lcr-online fake,
    source_database => ' REP102A. WORLD ',.
    dml_rule_name-online v_dml_rule,
    ddl_rule_name-online v_ddl_rule,
    inclusion_rule to-online true.
    queue_to_queue-online fake);
    DBMS_OUTPUT. Put_line ("rule DML of Propagation for SHIPPING. ORDER_ENTRY => ' | v_dml_rule);
    END;
    /

    BEGIN
    DBMS_CAPTURE_ADM. () PREPARE_TABLE_INSTANTIATION
    table-name => ' ORDERS. ORDER_ENTRY',.
    SUPPLEMENTAL_LOGGING-online 'key');
    END;
    /

    * 8. Set the instantiation scn for ORDERS. ORDER_ENTRY on the site target and start apply: *.

    -Apply on site
    CONNECT strmadmin/strmadmin
    SET SERVEROUTPUT ON
    DECLARE
    iSCN NUMBER;
    BEGIN
    iSCN: = DBMS_FLASHBACK. [email protected] ();
    DBMS_OUTPUT. Put_line (' instantiation SCN is: ' | iSCN);
    DBMS_APPLY_ADM. () SET_TABLE_INSTANTIATION_SCN
    source_object_name => ' ORDERS. ORDER_ENTRY',.
    source_database_name => ' REP102A. WORLD ',.
    instantiation_scn-online iSCN,
    apply_database_link => NULL);
    COMMIT;
    END;
    /

    BEGIN
    DBMS_APPLY_ADM. START_APPLY ('streams_apply');
    END;
    /

    -Check if apply is enabled
    SELECT apply_name, dba_apply State;

    * 9. Start capturing on source: *.

    CONNECT strmadmin/strmadmin
    BEGIN
    DBMS_CAPTURE_ADM. START_CAPTURE ('streams_capture');
    END;
    /

    * 10. Wait capture change its status of 'CAPTURER the CHANGES' and check that the status of propagation is ENABLED: *.

    CONNECT strmadmin/strmadmin
    SELECT capture_name, State FROM v$ streams_capture;
    SELECT propagation_name, dba_propagation State;

    * 11. Perform inserts in ORDERS. Table ORDER_ENTRY on the source site: *.

    CONNECT orders/orders
    INSERT INTO orders.order_entry VALUES (23450, 'Johnny Walker', 98456);
    INSERT INTO orders.order_entry VALUES (23451, "Chivas Regal", 98457);
    COMMIT;

    * 12. On the site apply, check the DELIVERY. ORDER_ENTRY and check if the data is replicated: *.

    CONNECT shipping/delivery
    SELECT * FROM shipping.order_entry;

    * 13. Check the application errors in the queue to apply: *.

    CONNECT strmadmin/strmadmin
    SELECT apply_name, local_transaction_id, error_number, error_message FROM dba_apply_error;

    Thank you
    Florent

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