DML using the partition.

Hello

10.2.0.1.0 Oracle

Is it possible to have quickly DML operation using partitions. as the update, insert, delete.


as we do in select * partition of course (2001_pg_courses);


kindly help.

You don't need to explicitly select a partition.

A partition table has 'rules' about what data go where. For example, a range may partition table have a 'rule' for a partition by day - all the lines for a day (according to table column invoice_date for example), is in a single partition. Similarly, a partitioned table list will also have a "rule", stating that the lines go in which partition.

You can explicitly reference the score via a SQL statement as follows to find all invoices for a customer:

select * from invoices partition (day_20110101) where customer_id = :1;

This SQL is however not very shareable under the partition name is hardcoded. If you want to find the Bills for another day, a new brand SQL statement is necessary with hardcoded score of the day in the SQL.

Also consider what it does to the application. User PL/SQL code can no longer use the SQL statement as is - like it needs a new SQL statement to use depending on the day. So dynamic SQL must be used - an approach complex and often creates a security risk because of risk of SQL injection.

Or you can implicitly reference the partition using this 'rule' as part of the predicate. For example

select * from invoices where invoice_date = :0 and customer_id = :1;

The CBO will see invoice_date is used and he will know that it is used as the "rule of the partition. The CBO can now decide which or the partitions to use.

The SQL that is created is shareable. We will use the same SQL in the shared pool of Oracle over and over again for customers and different days - we are not a completely new SQL for a day of different invoice.

The PL/SQL user can now use the SQL like it - no need to use SQL dynamically and inserting the name of partition in SQL. No threat of SQL injection.

Best of all - the PL/SQL Developer didn't need to worry how partition works, how it is applied, that partition names and so on. Standard SQL is used - as it would have been the case if the invoice table is not partitioned, or a cluster or an index organized table or anything else. The CBO has the intelligence to translate SQL into an optimal execution plan that is the most appropriate for the physical implementation table, available indexes and so on.

The developer must only be concerned about the logic of its SQL statement - and not by the complexity of the physical implementation of the database.

Tags: Database

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    -Kelan

    Hello

    so you should have an 'expert mode' option, I wonder this can´t find you. Another solution would be to transfer the image directly with "ghost" on the partition, but it means you start with ghost and then unzip the 'ghost' - image on the partition/HARD disk.

    Please give feedback so that we can chat about it...

    Welcome them

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