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What is Query Execution Plan? How does it help optimize or
tune a database driven application?
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Answer Posted / racing
When the SQL statement is executed Oracle designs an
execution plan for it. This execution plan is basically a
step by step instruction for how the statement must be
executed. That is, the order in which tables are read, if
indexes are used, which join methods are used to join
tables and so on. The execution plan for an SQL statement
can be viewed with the explain plan statement. The query
execution plan is elaborated during an SQL statement's
parse phase.
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