This command updates the statistics in the system catalogs that the optimizer USES to determine the lowest-cost query plan.
此命令更新了系统目录中的统计数据,优化程序使用这些数据来确定成本最低的查询计划。
An entry is added to the system catalog to indicate to the query optimizer that such a remote index exists.
一个条目被添加到系统编目中,以向查询优化器表明存在那样的一个远程索引。
The two versions differ in internal details like the indexing system, optimizer, and storage engine.
这两个版本在内部细节上不同,如索引系统、优化器和存储引擎。
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