Or, the difference could simply be due to other reasons, such as not enough distribution statistics collected by RUNSTATS.
当然也可能是由于其他原因造成的,比如RUNSTATS没有收集足够的分布统计信息。
Quantile statistics provide the information whether the values of a column are clustered or not.
分位数统计信息提供关于一个列中的值是否聚合的信息。
Depending on whether a developer is managing his own development database or not, he might need to ask the DBA to run statistics.
根据开发人员是否管理自己的开发数据库,他可能需要请求DBA运行统计数据。
应用推荐