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Oracle DML statements

Oracle Database Tips by Donald Burleson

Using Oracle DML

DML is short for "data Manipulation Language: and DML changes data in a table. If you insert a row into a table, that is DML. Oracle DML is a sub-set of the ANSI SQL standard and DML verbs include insert, update, delete and merge.

See DML updates,   DML delete

When you create, change or remove a database object, it is referred to as data definition language (DDL). All DML statements change data and must be committed before the change becomes permanent.

Also see my notes on Oracle parallel DML

The table is the basic building block of any database system and DML is the tool to populate and manage the data within the table.  You create a table by defining the column names and their data types. 

Each parallel execution server creates a different parallel process transaction. As a result, parallel DML requires more than one rollback segment for performance.

However, there are some restrictions as shown below:
  • A transaction can contain multiple parallel Oracle DML statements that modify different tables, but after parallel DML statements modify a table, no subsequent serial or parallel statement (DML or query) can access the same table again in that transaction.
  • Parallel DML operations cannot be done on tables with triggers. Relevant triggers must be disabled in order to parallel DML on the table.
  • A transaction involved in a parallel DML operation cannot be or become a distributed transaction.
  • Clustered tables are not supported.

old_values - These are the old column values related to the change. These are the column values for the row before the DML change. If the type of the DML statement is UPDATE or DELETE, these old values include some or all of the columns in the changed row before the DML statement. If the type of the DML statement is INSERT, there are no old values.

new_values - These are the new column values related to the change. These are the column values for the row after the Oracle DML change. If the type of the Oracle DML statements is UPDATE or INSERT, these new values include some or all of the columns in the changed row after the DML statements. If the type of the Oracle DML statements is DELETE, there are no new values.



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