如果没有，则启动runstats。
RUNSTATS with column group statistics.
包含列组统计信息的runstats。
RUNSTATS authorization and user access.
包含授权和用户访问的runstats。
Each line is a runstats command on a table or index.
每一个行是一个表或索引上的runstats命令。
Avoid running RUNSTATS on tables that don't need it.
避免在不需要它的表上运行RUNSTATS。
If priority is set to zero, RUNSTATS will run unthrottled.
如果将优先权设置为零，也能不加调整地运行RUNSTATS。
Thus, continue to use RUNSTATS as you would for relational data.
因此，像对待关系数据那样，继续使用RUNSTATS。
We will test PERFORMER after running runstats in a section below.
在下面的小节中，我们将在运行runstats 之后测试PERFORMER。
In most cases, a RUNSTATS is done after an index has been created.
大多数情况下，RUNSTATS是在创建索引之后执行的。
Use runstats on a regular basis as part of regular database maintenance.
定期使用runstats作为常规数据库维护的一部分。
A third problem can occur when performing RUNSTATS or REORG on your table.
当对表执行RUNSTATS或REORG时，可能出现第三个问题。
One way to handle this situation is to use the RUNSTATS throttling option.
处理该情形的一种方法就是使用RUNSTATS的throttling选项。
Otherwise, it returns the time stamp of the last time that runstats was run.
否则，它就返回最后一次运行runstats的时间戳。
Currently, a full table scan is performed whenever RUNSTATS on table is run.
目前，要运行表上的RUNSTATS，就要执行全表扫描。
Avoid running RUNSTATS on an empty database, as this will lead to poor performance.
避免在空数据库上运行RUNSTATS，因为那将导致低劣的性能。
It is only necessary to collect data runstats information, with distribution characteristics.
这里只需收集包含分布特征的数据runstats信息。
It is only necessary to collect data runstats information, with distribution characteristics.
这里只需收集包含分布特征的数据runstats信息。
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