optimizer

• This makes sure that the plan guide is used by the query optimizer
  这将确保计划指南可由查询优化器使用。
• Block , giving the optimizer a much larger basic block to work with
  块，向优化器提供了一个更大的基本块。
• Another way to influence the optimizer is to use query directives
  影响优化器的另一种方式就是使用查询命令。
• Approximate query execution costs are estimated by the query optimizer
  由查询优化器估计查询执行的大致开销。
• The optimizer is sensitive to the actual number of cpus that are online
  ，优化器就对联机的实际cpu数目敏感。
• Propagation role blocks are not modified by the optimizer , by default
  缺省情况下，优化器不会修改传播角色块。
• The optimizer performs complex calculations based on a host of information
  优化器根据许多信息执行复杂的计算。
• For example , the optimizer must determine whether indexes should be used
  例如，优化器必须确定是否应使用索引。
• The optimizer uses its value to determine its choice of the data access method
  优化器用其值来选择数据访问方法。
• Peo product engineering optimizer
  产品工程优化