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The general form of the for statement can be expressed as follows: When using this version of the for statement, keep in mind that: 1  The initialization expression initializes the loop; it's executed once, as the loop begins. 2  When the termination expression evaluates to false, the loop terminates.
The EXPLAIN PLAN statement displays execution plans chosen by the Oracle optimizer for SELECT, UPDATE, INSERT, and DELETE statements. A statement's execution plan is the sequence of operations Oracle performs to run the statement.The row source tree is the core of the execution plan.ifferent Schemas. 1  The execution and explain plan happen on different databases. 2  The user explaining the statement is different from the user running the statement. 3  Schema changes (usually changes in indexes) between the two operations.