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    Connor McDonald

    log syncs caused by user$ updates

    Hello , during the connection 'storm' (for example after restarting app servers , because of DB maintenance tasks ) i observe high amount of these commands: update user$ set spare6=DECODE(to_char(:2, 'YYYY-MM-DD'), '0000-00-00', to_date(NULL), :2) where user#=:1 roughly , 30 % of
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  • #SELECTION#
    Connor McDonald

    Datapump Export - Table Partition

    Hey Guys, We are attempting to export selective partitions of a table and would like to filter records for each partition. Would you please explain how we can achieve using one parameter file? Below is an example of the parameter file that we are using. For example, I have a tabl...
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  • #SELECTION#
    Connor McDonald

    ora-4068

    HI TOM, Tnx for this oppurtunity again, Can You explain how does the ORA-4068 occurs and how can I go about it? How does oracle manages the freelist (8i) on LMT's? And how can we track the freespace, used space, and fragmentation on LMT's? What's the difference between creating t...
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  • #SELECTION#
    Connor McDonald

    Architectural Advice: Reporting via Pipelined Functions vs. Views in a 4-Schema SmartDB

    I am implementing a 4-Schema SmartDB architecture for an Oracle APEX project to strictly enforce the principle of least privilege. My schemas are: DATA_LAYER (Tables), LOGIC_LAYER (Private Logic), API_LAYER (Public Interface), and APEX_UI_LAYER (Parsing Schema). I am currently de...
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  • #SELECTION#
    Connor McDonald

    Materialize Hint used in almost all queries

    Hello, Thanks to this forum a lot of my answers were answered. I noticed that most of the queries in an application that am working on is using the MATERIALIZE hint in the subqueries. Our queries heavily use CTEs and relies on multiple joins. Our query performance is not great. I...
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