在超大容量表数据库中,查询优化尤为重要。
Query optimization was very important in database of super contain table.
但如果没有索引,则查询优化器必须扫描表。
However, if no indexes are available, the query optimizer must use a table scan.
查询优化是数据库管理系统的一个重要组成部分。
Query optimization is an important element of database manager system.
优化器会选择类似如下所示的查询访问计划。
A query access plan similar to the following is chosen by the optimizer.
影响优化器的另一种方式就是使用查询命令。
Another way to influence the optimizer is to use query directives.
最好的方法是确保查询已经进行了优化。
The best thing you can do is make sure your queries are optimized.
在数据存储过程中的索引优化使得XMAS在数据查询上具有良好的性能。
During the data store process, index optimization makes XMAS have good performance on data retrieval.
在数据存储过程中的索引优化使得XMAS在数据查询上具有良好的性能。
During the data store process, index optimization makes XMAS have good performance on data retrieval.
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