![]() ![]() cialis lowest prices It is an antidepressant and it cialis tab is performed especially in and around one’s genital region. Pages 3-5 illustrate Adaptive Join Plans in action.įorgive us make sure you if we occasionally appear a bit viagra cheapest pharmacy jealous of our time. If Oracle determines this is the wrong execution plan, it can switch to the adaptive plan on the fly.įor more info on Adaptive Plans, see this white paper from Oracle. Oracle will watch the execution of the SQL statement as it starts executing with the default plan. One plan is the default plan and the other plan is the adaptive plan. Before the execution of the SQL statement begins, the Optimizer has two plans. ![]() The Optimizer has also decided that an Index Fast Full Scan into a Hash Join may be another execution plan to consider. For the plan that involves the Nested Loops join, Oracle will access the table with an Index Range Scan. For this SQL statement, the Optimizer has determined to use an initial plan involving the Nested Loops join. ![]() Why two accesses of the same table? What is Oracle 12c doing?Īll of this is part of the new 12c Optimizer’s Adaptive Query Optimization. Later on in the plan, I see an INDEX (FAST FULL SCAN) of the same table that has the INDEX (RANGE SCAN) performed. My first reaction was to freak out and wonder why Oracle has both a Hash Join and a Nested Loops join for joining two tables. I was surprised to see some gray text in the Explain Plan output, which you can see below. As I typically do, I like to use SQL Developer to see the Explain Plan. I’ve been working on tuning some SQL statements in a newly upgraded database, from Oracle 11.2.0.4 to 12.1.0.2. ![]()
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