View,mview and dblink

Hi All,
When we use views,when we use Materialized views and when we use Data Base Links.I am really struggling to understand.
View contains updated data and Materialized view also contains updated data .As per my knowledge Materialized view are local copys of remote database.
But we can access remote tables using dblinks also.As follows
INSERT INTO local_table select * from rm_table@remote_databse.
But what is the advantages of materialized views .What can we achieve using MVIEWS.
Please help me and please provide me a real time example.
Thanks in advance

You can use a database link, sure. But think about the physics of the two approaches.
If you are relying on a database link, then you have to move the data over the network (the slowest component of the system) every time you want to query it. That may be acceptable if you just need to do a single-row lookup (though you are adding a network round-trip or two which can be meaningful in an OLTP transaction). If you have to select thousands or millions of rows, however, that is going to be far less efficient than querying a local cache (i.e. data replicated locally via a materialized view).
Related to that, if you are trying to join a local table and a remote table, Oracle may have to copy all the data from one of the tables to the other system so that one system can do the join and then return the results back to the originating system. That can involve a lot of network traffic and can be extremely hard to tune.
If you are relying on a database link, then your system will fail when the remote system is down which means that the administrators of the remote system have to coordinate downtime with users of your system. If you have a small company where all databases have the same uptime requirements and can be safely brought offline together for maintenance, that's probably not too big a deal. In a Fortune 500 company where there are hundreds of different databases supporting thousands of different applications with various downtime requirements, however, it would be an impossible task to coordinate maintenance with every downstream system that wanted to consume another system's reference data.
And, if you are relying on a database link, you're putting load on the source system every time a query is run. One of the common reasons that people create reporting databases and replicate data there is so that they can keep their OLTP system performance acceptable rather than having one or two rogue reporting queries consuming large amounts of system resources at inopportune times. That is, when a manager decides to get the report of total sales by region, you don't want that work slowing down the process of actually taking new orders. Particularly if 10 managers may all decide on a random Tuesday afternoon to run the report in preparation for a 3 o'clock meeting meaning that you would have 10 sessions all copying the same data over the network simultaneously, 10 reporting sessions putting a load on the order processing system, etc.
Justin

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    AND GRGR.GRGR_ID = M1.GRGR_ID
    )AS MEME_CK
    FROM FADMIN.METR_TABLE@TO_FUT M1,
    ( SELECT M3.HID, M3.EFF_DT FROM FADMIN.METR_TABLE@TO_FUT M3
    WHERE M3.TYPE IN ('60','61')
    AND M3.REPLY IN ('117','118')
    AND TRUNC (M3.METR_TRANS_DT) BETWEEN START_DATE AND END_DATE
    AND M3.SYIN_INST = (SELECT MAX (M4.SYIN_INST)
    FROM FADMIN.METR_TABLE@TO_FUT M4
    WHERE M4.HID = M3.HID
    AND M4.TYPE IN ('60','61')
    AND M4.REPLY IN ('117','118')
    AND TRUNC (M4.EFF_DT) = TRUNC (M3.EFF_DT))
    ) TEMP
    WHERE M1.TYPE IN ('60','61')
    AND M1.REPLY ='011'
    AND TRUNC (M1.METR_TRANS_DT) BETWEEN START_DATE AND END_DATE
    AND M1.SYIN_INST = (SELECT MAX (M2.SYIN_INST)
    FROM FADMIN.METR_TABLE@TO_FUT M2
    WHERE M2.HID = M1.HID
    AND M2.TYPE IN ('60','61')
    AND M2.REPLY ='011'
    AND TRUNC (M2.EFF_DT) = TRUNC (M1.EFF_DT))
    AND M1.HID = TEMP.HID (+)
    AND M1.EFF_DT = TEMP.EFF_DT (+)
    AND TEMP.HID IS NULL
    UNION
    SELECT
    M1.FIRST_NAME ,
    M1.LAST_NAME ,
    M1.HID ,
    M1.EFF_DT,
    M1.CID,
    M1.PLAN ,
    (SELECT MEME.MEME_CK
    FROM FADMIN.MEME_TABLE@TO_FUT MEME, FADMIN.GRGR_TABLE@TO_FUT GRGR
    WHERE MEME.M_HIN = M1.HID
    AND MEME.GRGR_CK = GRGR.GRGR_CK
    AND GRGR.GRGR_ID = M1.GRGR_ID
    )AS MEME_CK
    FROM FADMIN.METR_TABLE@TO_FUT M1
    WHERE M1.TYPE IN ('60','61')
    AND M1.REPLY IN ('016', '017', '022', '023')
    AND TRUNC (M1.METR_TRANS_DT) BETWEEN START_DATE AND END_DATE
    AND M1.SYIN_INST = (SELECT MAX (M2.SYIN_INST)
    FROM FADMIN.METR_TABLE@TO_FUT M2
    WHERE M2.HID = M1.HID
    AND M2.TYPE IN ('60','61')
    AND M2.REPLY IN ('016', '017', '022', '023')
    AND TRUNC (M2.EFF_DT) = TRUNC (M1.EFF_DT))
    )TEMP1 ;
    END;
    The error:
    ORA-00918: column ambiguously defined
    ORA-02063: preceding line from TO_FUT
    ORA-06512: at "PROC_ENR_ACC", line 5
    ORA-06512: at line 5

    Okay
    Here's the code formatted
    CREATE OR REPLACE PROCEDURE PROC_ENR_ACC (START_DATE DATE, END_DATE DATE)
    AS
    BEGIN
       EXECUTE IMMEDIATE 'TRUNCATE TABLE OUTPUT_TABLE';
       INSERT INTO OUTPUT_TABLE (FIRST_NAME,
                                 LAST_NAME,
                                 HID,
                                 EFF_DT,
                                 CID,
                                 PLAN,
                                 FLAG)
       SELECT   TEMP1.FIRST_NAME,
                TEMP1.LAST_NAME,
                TEMP1.HID,
                TEMP1.EFF_DT,
                TEMP1.CID,
                TEMP1.PLAN,
                NVL (
                     (SELECT   'Y'
                      FROM   MEMI_TABLE MEMI
                      WHERE       MEMI.MEME_CK = TEMP1.MEME_CK
                      AND MEMI.TXN_EFF_DT = TEMP1.EFF_DT
                      AND MEMI.PBP = TEMP1.PLAN
                      AND MEMI.MEMI_TXN_CD IN ('AC', 'RE')
                      AND MEMI.MEMI_SEQ_NO = (SELECT   MAX (MI.MEMI_SEQ_NO)
                                              FROM   MEMI_TABLE MI
                                              WHERE   MI.MEME_CK = MEMI.MEME_CK
                                              AND MI.TXN_EFF_DT = MEMI.TXN_EFF_DT
                                              AND MI.PBP = MEMI.PBP
                                              AND MI.MEMI_TXN_CD IN ('AC', 'RE')
                                              AND MI.MEMI_INTF_STS = 03)
                      ),'N') FLAG
       FROM (SELECT   M1.FIRST_NAME,
                      M1.LAST_NAME,
                      M1.HID,
                      M1.EFF_DT,
                      M1.CID,
                      M1.PLAN,
                      (SELECT   MEME.MEME_CK
                       FROM   MEME_TABLE MEME, GRGR_TABLE GRGR
                       WHERE       MEME.M_HIN = M1.HID
                       AND MEME.GRGR_CK = GRGR.GRGR_CK
                       AND GRGR.GRGR_ID = M1.GRGR_ID) MEME_CK
             FROM   METR_TABLE M1,
                    (SELECT   M3.HID, M3.EFF_DT
                     FROM   METR_TABLE M3
                     WHERE   M3.TYPE IN ('60', '61')
                     AND M3.REPLY IN ('117', '118')
                     AND TRUNC (M3.METR_TRANS_DT) BETWEEN START_DATE AND  END_DATE
                     AND M3.SYIN_INST = (SELECT   MAX (M4.SYIN_INST)
                                         FROM   METR_TABLE M4
                                         WHERE   M4.HID = M3.HID
                                         AND M4.TYPE IN ('60', '61')
                                         AND M4.REPLY IN ('117', '118')
                                         AND TRUNC (M4.EFF_DT) = TRUNC (M3.EFF_DT))
                     ) TEMP
             WHERE   M1.TYPE IN ('60', '61') AND M1.REPLY = '011'
             AND TRUNC (M1.METR_TRANS_DT) BETWEEN START_DATE AND  END_DATE
             AND M1.SYIN_INST = (SELECT   MAX (M2.SYIN_INST)
                                 FROM   METR_TABLE M2
                                 WHERE       M2.HID = M1.HID
                                 AND M2.TYPE IN ('60', '61')
                                 AND M2.REPLY = '011'
                                 AND TRUNC (M2.EFF_DT) = TRUNC (M1.EFF_DT))
            AND M1.HID = TEMP.HID(+)
            AND M1.EFF_DT = TEMP.EFF_DT(+)
            AND TEMP.HID IS NULL
            UNION
            SELECT   M1.FIRST_NAME,
                     M1.LAST_NAME,
                     M1.HID,
                     M1.EFF_DT,
                     M1.CID,
                     M1.PLAN,
                     (SELECT   MEME.MEME_CK
                      FROM   MEME_TABLE MEME, GRGR_TABLE GRGR
                      WHERE       MEME.M_HIN = M1.HID
                      AND MEME.GRGR_CK = GRGR.GRGR_CK
                      AND GRGR.GRGR_ID = M1.GRGR_ID) MEME_CK
            FROM   METR_TABLE M1
            WHERE   M1.TYPE IN ('60', '61')
            AND M1.REPLY IN ('016', '017', '022', '023')
            AND TRUNC (M1.METR_TRANS_DT) BETWEEN START_DATE AND  END_DATE
            AND M1.SYIN_INST = (SELECT   MAX (M2.SYIN_INST)
                                FROM   METR_TABLE M2
                                WHERE   M2.HID = M1.HID
                                AND M2.TYPE IN ('60', '61')
                                AND M2.REPLY IN ('016', '017', '022', '023')
                                AND TRUNC (M2.EFF_DT) = TRUNC (M1.EFF_DT))
            ) TEMP1;
    END;
    /When posting code if you put {noformat}{noformat} (with the curly brackets and in lower case) above and below it you can preserve formatting.
    To your original question...
    Is the link name supposed to be variable?
    What do you mean by 'hard coding' the values, do you mean in the procedure itself so you'd actually PROC_ENR_ACC();?
    What happens when you run this?DECLARE
    start_date DATE;
    end_date DATE;
    BEGIN
    start_date := '01-JAN-2009';
    end_date := '01-FEB-2009';
    PROC_ENR_ACC(start_date, end_date);
    END;
    I need to know exactly how to recreate your error...
    Cheers
    Ben
    http://www.munkyben.wordpress.com
    +Don't forget to mark replies helpful or correct+ ;)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           

  • View Word and PowerPoint in browser no longer working

    Hi There,
    I have SharePoint 2010 environment. I configured Word Viewing Service and PowerPoint service accordingly and all working perfectly. But recently it didn't work any more. I deleted services and recreate services, even stop and restart the service from Central
    Administration interface didn't make it working. I got same error message as below:
    I found some suggestions from Google, and I did check the setting, but I didn't fix the problem.
    Regards,
    Tony

    You must increase the permission on both service applications and then execute an IIS reset. Follow the steps explained in below article and you should get the error resolved.
    Fixing Office Web Apps "Network Connectivity has been lost error"
    As given in article...
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    Add-PSSnapin Microsoft.SharePoint.PowerShell -erroraction SilentlyContinue
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    Get-SPPowerPointServiceApplication | Set-SPPowerPointServiceApplication -EnableSandboxedEditing $false
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    Write-Host -ForegroundColor White "--------------------------------------------------------------"
    2. Do an IIS reset on SharePoint Application Server.
    Note: Office Web Apps must be installed on a farm which uses a domain controller. For standalone installations this fix will not
    work. Before running this script please check the name of “Word Viewing Service Application“
    and PowerPoint Service Application because it may differ in your system. You can check it either from central administration site or by running “Get-SPServiceApplication”
    command.
    Please remember to click 'Mark as Answer'
    if the reply answers your query or 'Upvote' if it helps you.

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