SQL statement in the process of preparing to spend up to the steps is to generate the execution plan, in particular those dealing with multiple table join queries. When the Oracle assessment table join order, it must take into account all the possible connections between the tables. For example: the connection between the six tables there are 720 possible connection lines. When a query contains more than 10 tables of connections, the arrangement of the problem will become more significant. For the connection between the 15 tables, queries need to assess the possible arrangement of over 1 trillion species. For example: there are five table join query to connect 120 possible combinations, so if optimizer_search_limit equal to 5, the optimizer will evaluate all possible 120. optimizer_search_limit parameter also controls the call connections with an asterisk prompt threshold. When the number of tables in the query than optimizer_search_limit hours, with an asterisk prompt will be given priority.
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