One of many replication, or I can do this?

Hello

I have two 6510e on the campus. One of them is the main (in our main data center) and the other in our data center for backup (also on campus) and is just there to replicate to. It's a fairly simple setup and it works beautifully. Now the key: it works so well that people are starting to ask whether there is a way to have a third unit (perhaps a PS6610E, not sure yet) sitting in our disaster recovery site and replicate the secondary unit.

Thank you!

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Hello

No sorry.  A volume can be replicated only to one partner, and you can not re - duplicate a replica.   I've heard of customers using scripts for promote/clone a replica to a host side DR to backup to tape, or software to replicate to another use host-based storage.

Kind regards

Don

Tags: Dell Products

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      SUBMISSION_NAME           VARCHAR2(100)       NOT NULL
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    INSERT INTO SUBMISSION (SUBMISSION_ID, SUBMISSION_NAME) VALUES (2, 'Thesis on 17th Century Weather Patterns');
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    [email protected]_11gR2> -- tables and data that you provided:
    [email protected]_11gR2> CREATE TABLE SUBMISSION
      2  ( SUBMISSION_ID           NUMBER(10)          NOT NULL,
      3    SUBMISSION_NAME           VARCHAR2(100)          NOT NULL
      4  )
      5  /
    
    Table created.
    
    [email protected]_11gR2> CREATE TABLE ADVISOR_TYPE
      2  ( ADVISOR_TYPE_ID           NUMBER(10)          NOT NULL,
      3    ADVISOR_TYPE_NAME      VARCHAR2(50)          NOT NULL
      4  )
      5  /
    
    Table created.
    
    [email protected]_11gR2> CREATE TABLE SUBMISSION_ADVISORS
      2  ( SUBMISSION_ADVISORS_ID      NUMBER(10)          NOT NULL,
      3    SUBMISSION_ID           NUMBER(10)          NOT NULL,
      4    ADVISOR_TYPE_ID           NUMBER(10)          NOT NULL,
      5    FIRST_NAME           VARCHAR(50)          NULL,
      6    LAST_NAME           VARCHAR(50)          NULL,
      7    SUFFIX                VARCHAR(20)          NULL
      8  )
      9  /
    
    Table created.
    
    [email protected]_11gR2> INSERT ALL
      2  INTO SUBMISSION (SUBMISSION_ID, SUBMISSION_NAME)
      3    VALUES (1, 'Some Research Paper')
      4  INTO SUBMISSION (SUBMISSION_ID, SUBMISSION_NAME)
      5    VALUES (2, 'Thesis on 17th Century Weather Patterns')
      6  INTO SUBMISSION (SUBMISSION_ID, SUBMISSION_NAME)
      7    VALUES (3, 'Statistical Analysis on Sunny Days in March')
      8  SELECT * FROM DUAL
      9  /
    
    3 rows created.
    
    [email protected]_11gR2> INSERT ALL
      2  INTO ADVISOR_TYPE (ADVISOR_TYPE_ID, ADVISOR_TYPE_NAME)
      3    VALUES (1, 'Department Chair')
      4  INTO ADVISOR_TYPE (ADVISOR_TYPE_ID, ADVISOR_TYPE_NAME)
      5    VALUES (2, 'Department Co-Chair')
      6  INTO ADVISOR_TYPE (ADVISOR_TYPE_ID, ADVISOR_TYPE_NAME)
      7    VALUES (3, 'Professor')
      8  INTO ADVISOR_TYPE (ADVISOR_TYPE_ID, ADVISOR_TYPE_NAME)
      9    VALUES (4, 'Associate Professor')
     10  INTO ADVISOR_TYPE (ADVISOR_TYPE_ID, ADVISOR_TYPE_NAME)
     11    VALUES (5, 'Scientist')
     12  SELECT * FROM DUAL
     13  /
    
    5 rows created.
    
    [email protected]_11gR2> INSERT ALL
      2  INTO SUBMISSION_ADVISORS (SUBMISSION_ADVISORS_ID, SUBMISSION_ID, ADVISOR_TYPE_ID, FIRST_NAME, LAST_NAME, SUFFIX)
      3    VALUES (1,1,2,'John', 'Doe', 'PhD')
      4  INTO SUBMISSION_ADVISORS (SUBMISSION_ADVISORS_ID, SUBMISSION_ID, ADVISOR_TYPE_ID, FIRST_NAME, LAST_NAME, SUFFIX)
      5    VALUES (2,1,2,'Jane', 'Doe', 'PhD')
      6  INTO SUBMISSION_ADVISORS (SUBMISSION_ADVISORS_ID, SUBMISSION_ID, ADVISOR_TYPE_ID, FIRST_NAME, LAST_NAME, SUFFIX)
      7    VALUES (3,2,3,'Johan', 'Smith', NULL)
      8  INTO SUBMISSION_ADVISORS (SUBMISSION_ADVISORS_ID, SUBMISSION_ID, ADVISOR_TYPE_ID, FIRST_NAME, LAST_NAME, SUFFIX)
      9    VALUES (4,2,4,'Magnus', 'Jackson', 'MS')
     10  INTO SUBMISSION_ADVISORS (SUBMISSION_ADVISORS_ID, SUBMISSION_ID, ADVISOR_TYPE_ID, FIRST_NAME, LAST_NAME, SUFFIX)
     11    VALUES (5,3,5,'Williard', 'Forsberg', 'AMS')
     12  SELECT * FROM DUAL
     13  /
    
    5 rows created.
    
    [email protected]_11gR2> -- constraints presumed based on your description:
    [email protected]_11gR2> ALTER TABLE submission ADD CONSTRAINT submission_id_pk
      2    PRIMARY KEY (submission_id)
      3  /
    
    Table altered.
    
    [email protected]_11gR2> ALTER TABLE advisor_type ADD CONSTRAINT advisor_type_id_pk
      2    PRIMARY KEY (advisor_type_id)
      3  /
    
    Table altered.
    
    [email protected]_11gR2> ALTER TABLE submission_advisors ADD CONSTRAINT submission_advisors_id_pk
      2    PRIMARY KEY (submission_advisors_id)
      3  /
    
    Table altered.
    
    [email protected]_11gR2> ALTER TABLE submission_advisors ADD CONSTRAINT submission_id_fk
      2    FOREIGN KEY (submission_id) REFERENCES submission (submission_id)
      3  /
    
    Table altered.
    
    [email protected]_11gR2> ALTER TABLE submission_advisors ADD CONSTRAINT advisor_type_id_fk
      2    FOREIGN KEY (advisor_type_id) REFERENCES advisor_type (advisor_type_id)
      3  /
    
    Table altered.
    
    [email protected]_11gR2> -- resulting data:
    [email protected]_11gR2> COLUMN submission_name FORMAT A45
    [email protected]_11gR2> COLUMN advisor      FORMAT A40
    [email protected]_11gR2> SELECT s.submission_name,
      2           a.advisor_type_name || ' ' ||
      3           sa.first_name || ' ' ||
      4           sa.last_name || ' ' ||
      5           sa.suffix AS advisor
      6  FROM   submission_advisors sa,
      7           submission s,
      8           advisor_type a
      9  WHERE  sa.advisor_type_id = a.advisor_type_id
     10  AND    sa.submission_id = s.submission_id
     11  /
    
    SUBMISSION_NAME                               ADVISOR
    --------------------------------------------- ----------------------------------------
    Some Research Paper                           Department Co-Chair John Doe PhD
    Some Research Paper                           Department Co-Chair Jane Doe PhD
    Thesis on 17th Century Weather Patterns       Professor Johan Smith
    Thesis on 17th Century Weather Patterns       Associate Professor Magnus Jackson MS
    Statistical Analysis on Sunny Days in March   Scientist Williard Forsberg AMS
    
    5 rows selected.
    
    [email protected]_11gR2> -- procedure to create virtual documents:
    [email protected]_11gR2> CREATE OR REPLACE PROCEDURE submission_advisors_proc
      2    (p_rowid IN           ROWID,
      3       p_clob     IN OUT NOCOPY CLOB)
      4  AS
      5  BEGIN
      6    FOR r1 IN
      7        (SELECT *
      8         FROM      submission_advisors
      9         WHERE  ROWID = p_rowid)
     10    LOOP
     11        IF r1.first_name IS NOT NULL THEN
     12          DBMS_LOB.WRITEAPPEND (p_clob, 12, '');
     13          DBMS_LOB.WRITEAPPEND (p_clob, LENGTH (r1.first_name), r1.first_name);
     14          DBMS_LOB.WRITEAPPEND (p_clob, 13, '');
     15        END IF;
     16        IF r1.last_name IS NOT NULL THEN
     17          DBMS_LOB.WRITEAPPEND (p_clob, 11, '');
     18          DBMS_LOB.WRITEAPPEND (p_clob, LENGTH (r1.last_name), r1.last_name);
     19          DBMS_LOB.WRITEAPPEND (p_clob, 12, '');
     20        END IF;
     21        IF r1.suffix IS NOT NULL THEN
     22          DBMS_LOB.WRITEAPPEND (p_clob, 8, '');
     23          DBMS_LOB.WRITEAPPEND (p_clob, LENGTH (r1.suffix), r1.suffix);
     24          DBMS_LOB.WRITEAPPEND (p_clob, 9, '');
     25        END IF;
     26        FOR r2 IN
     27          (SELECT *
     28           FROM   submission
     29           WHERE  submission_id = r1.submission_id)
     30        LOOP
     31          DBMS_LOB.WRITEAPPEND (p_clob, 17, '');
     32          DBMS_LOB.WRITEAPPEND (p_clob, LENGTH (r2.submission_name), r2.submission_name);
     33          DBMS_LOB.WRITEAPPEND (p_clob, 18, '');
     34        END LOOP;
     35        FOR r3 IN
     36          (SELECT *
     37           FROM   advisor_type
     38           WHERE  advisor_type_id = r1.advisor_type_id)
     39        LOOP
     40          DBMS_LOB.WRITEAPPEND (p_clob, 19, '');
     41          DBMS_LOB.WRITEAPPEND (p_clob, LENGTH (r3.advisor_type_name), r3.advisor_type_name);
     42          DBMS_LOB.WRITEAPPEND (p_clob, 20, '');
     43        END LOOP;
     44    END LOOP;
     45  END submission_advisors_proc;
     46  /
    
    Procedure created.
    
    [email protected]_11gR2> SHOW ERRORS
    No errors.
    [email protected]_11gR2> -- examples of virtual documents that procedure creates:
    [email protected]_11gR2> DECLARE
      2    v_clob  CLOB := EMPTY_CLOB();
      3  BEGIN
      4    FOR r IN
      5        (SELECT ROWID rid FROM submission_advisors)
      6    LOOP
      7        DBMS_LOB.CREATETEMPORARY (v_clob, TRUE);
      8        submission_advisors_proc (r.rid, v_clob);
      9        DBMS_OUTPUT.PUT_LINE (v_clob);
     10        DBMS_LOB.FREETEMPORARY (v_clob);
     11    END LOOP;
     12  END;
     13  /
    JohnDoePhDSome
    Research PaperDepartment Co-Chair
    JaneDoePhDSome
    Research PaperDepartment Co-Chair
    JohanSmithThesis on 17th Century
    Weather PatternsProfessor
    MagnusJacksonMSThe
    sis on 17th Century Weather PatternsAssociate
    Professor
    WilliardForsbergAMS
    

    Statistical Analysis on Sunny Days in

    MarchScientist
    
    PL/SQL procedure successfully completed.
    
    [email protected]_11gR2> -- user_datastore that uses procedure:
    [email protected]_11gR2> BEGIN
      2    CTX_DDL.CREATE_PREFERENCE ('sa_datastore', 'USER_DATASTORE');
      3    CTX_DDL.SET_ATTRIBUTE ('sa_datastore', 'PROCEDURE', 'submission_advisors_proc');
      4  END;
      5  /
    
    PL/SQL procedure successfully completed.
    
    [email protected]_11gR2> -- index (on optional extra column) that uses user_datastore and section group:
    [email protected]_11gR2> ALTER TABLE submission_advisors ADD (any_column VARCHAR2(1))
      2  /
    
    Table altered.
    
    [email protected]_11gR2> CREATE INDEX submission_advisors_idx
      2  ON submission_advisors (any_column)
      3  INDEXTYPE IS CTXSYS.CONTEXT
      4  PARAMETERS
      5    ('DATASTORE     sa_datastore
      6        SECTION GROUP     CTXSYS.AUTO_SECTION_GROUP')
      7  /
    
    Index created.
    
    [email protected]_11gR2> -- what is tokenized, indexed, and searchable:
    [email protected]_11gR2> SELECT token_text FROM dr$submission_advisors_idx$i
      2  /
    
    TOKEN_TEXT
    ----------------------------------------------------------------
    17TH
    ADVISOR_TYPE_NAME
    AMS
    ANALYSIS
    ASSOCIATE
    CENTURY
    CHAIR
    CO
    DAYS
    DEPARTMENT
    DOE
    FIRST_NAME
    FORSBERG
    JACKSON
    JANE
    JOHAN
    JOHN
    LAST_NAME
    MAGNUS
    MARCH
    PAPER
    PATTERNS
    PHD
    PROFESSOR
    RESEARCH
    SCIENTIST
    SMITH
    STATISTICAL
    SUBMISSION_NAME
    SUFFIX
    SUNNY
    THESIS
    WEATHER
    WILLIARD
    
    34 rows selected.
    
    [email protected]_11gR2> -- sample searches across all data:
    [email protected]_11gR2> VARIABLE search_string VARCHAR2(100)
    [email protected]_11gR2> EXEC :search_string := 'professor'
    
    PL/SQL procedure successfully completed.
    
    [email protected]_11gR2> SELECT s.submission_name,
      2           a.advisor_type_name || ' ' ||
      3           sa.first_name || ' ' ||
      4           sa.last_name || ' ' ||
      5           sa.suffix AS advisor
      6  FROM   submission_advisors sa,
      7           submission s,
      8           advisor_type a
      9  WHERE  CONTAINS (sa.any_column, :search_string) > 0
     10  AND    sa.advisor_type_id = a.advisor_type_id
     11  AND    sa.submission_id = s.submission_id
     12  /
    
    SUBMISSION_NAME                               ADVISOR
    --------------------------------------------- ----------------------------------------
    Thesis on 17th Century Weather Patterns       Professor Johan Smith
    Thesis on 17th Century Weather Patterns       Associate Professor Magnus Jackson MS
    
    2 rows selected.
    
    [email protected]_11gR2> EXEC :search_string := 'doe'
    
    PL/SQL procedure successfully completed.
    
    [email protected]_11gR2> /
    
    SUBMISSION_NAME                               ADVISOR
    --------------------------------------------- ----------------------------------------
    Some Research Paper                           Department Co-Chair John Doe PhD
    Some Research Paper                           Department Co-Chair Jane Doe PhD
    
    2 rows selected.
    
    [email protected]_11gR2> EXEC :search_string := 'paper'
    
    PL/SQL procedure successfully completed.
    
    [email protected]_11gR2> /
    
    SUBMISSION_NAME                               ADVISOR
    --------------------------------------------- ----------------------------------------
    Some Research Paper                           Department Co-Chair John Doe PhD
    Some Research Paper                           Department Co-Chair Jane Doe PhD
    
    2 rows selected.
    
    [email protected]_11gR2> -- sample searches within specific columns:
    [email protected]_11gR2> EXEC :search_string := 'chair'
    
    PL/SQL procedure successfully completed.
    
    [email protected]_11gR2> SELECT s.submission_name,
      2           a.advisor_type_name || ' ' ||
      3           sa.first_name || ' ' ||
      4           sa.last_name || ' ' ||
      5           sa.suffix AS advisor
      6  FROM   submission_advisors sa,
      7           submission s,
      8           advisor_type a
      9  WHERE  CONTAINS (sa.any_column, :search_string || ' WITHIN advisor_type_name') > 0
     10  AND    sa.advisor_type_id = a.advisor_type_id
     11  AND    sa.submission_id = s.submission_id
     12  /
    
    SUBMISSION_NAME                               ADVISOR
    --------------------------------------------- ----------------------------------------
    Some Research Paper                           Department Co-Chair John Doe PhD
    Some Research Paper                           Department Co-Chair Jane Doe PhD
    
    2 rows selected.
    
    [email protected]_11gR2> EXEC :search_string := 'phd'
    
    PL/SQL procedure successfully completed.
    
    [email protected]_11gR2> SELECT s.submission_name,
      2           a.advisor_type_name || ' ' ||
      3           sa.first_name || ' ' ||
      4           sa.last_name || ' ' ||
      5           sa.suffix AS advisor
      6  FROM   submission_advisors sa,
      7           submission s,
      8           advisor_type a
      9  WHERE  CONTAINS (sa.any_column, :search_string || ' WITHIN suffix') > 0
     10  AND    sa.advisor_type_id = a.advisor_type_id
     11  AND    sa.submission_id = s.submission_id
     12  /
    
    SUBMISSION_NAME                               ADVISOR
    --------------------------------------------- ----------------------------------------
    Some Research Paper                           Department Co-Chair John Doe PhD
    Some Research Paper                           Department Co-Chair Jane Doe PhD
    
    2 rows selected.
    
    [email protected]_11gR2> EXEC :search_string := 'weather'
    
    PL/SQL procedure successfully completed.
    
    [email protected]_11gR2> SELECT s.submission_name,
      2           a.advisor_type_name || ' ' ||
      3           sa.first_name || ' ' ||
      4           sa.last_name || ' ' ||
      5           sa.suffix AS advisor
      6  FROM   submission_advisors sa,
      7           submission s,
      8           advisor_type a
      9  WHERE  CONTAINS (sa.any_column, :search_string || ' WITHIN submission_name') > 0
     10  AND    sa.advisor_type_id = a.advisor_type_id
     11  AND    sa.submission_id = s.submission_id
     12  /
    
    SUBMISSION_NAME                               ADVISOR
    --------------------------------------------- ----------------------------------------
    Thesis on 17th Century Weather Patterns       Professor Johan Smith
    Thesis on 17th Century Weather Patterns       Associate Professor Magnus Jackson MS
    
    2 rows selected.
    
  • one-to-many relationship

    Read the article here...

    http://www.databaseprimer.com/relationship_1tox.html

    To illustrate the one-to-many relationship consider the table of sampling plan and data below:
    authors table
    ============
    author_id (primary key)
    LastName
    FirstName
    book_id (foreign key - link to table books book_id)


    table Books
    ===========
    book_id (primary key)
    title
    author_id  lastname  firstname   ->     book_id  title
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    0001       henry     john        ->     0001     a database primer
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                                            0003     teach yourself sql
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    don't know how to frame the table 'authors '...

    It would become the relation 1-1... is it normal?

    Please help how data will be in the "authors" table

    Thank you

    You do not want to have a database template that you have illustrated below. Why? Well to start tt does not pass even the first normal form. Secondly, if you had ever updated the author's name, you will need to update in several places, which could lead to problems of data integrity. A database designed to reduce redundancy, the structure that you have proposed increases it.

    If you had been modelling a one-to-many relationship, it would be more appropriate:

    CREATE TABLE authors
    ( author_id  NUMBER        PRIMARY KEY
    , last_name  VARCHAR2(200) NOT NULL
    , first_name VARCHAR2(200) NOT NULL
    );
    
    CREATE TABLE books
    ( book_id NUMBER        PRIMARY KEY
    , title   VARCHAR2(200)
    );
    
    CREATE TABLE authors_of_books
    ( author_id NUMBER NOT NULL REFERENCES authors(author_id)
    , book_id   NUMBER NOT NULL PRIMARY KEY REFERENCES books(book_id)
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    This models your one-to-many relationship with a "join" table or "bridge." The drawing above gives you the ability to change the author freely or to book the title attributes in the same place increases your data integrity.

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