The sequentialindex, which suffixes the file name, is generated by the binding and stored in the file specified by “Sequence file”.
作为文件名后缀的顺序索引由绑定生成，且存储在 “Sequence file” 指定的文件中。
2
Access plan directives that force the optimizer to use the designated access method for data retrieval, either sequential scan or index scan.
访问计划指示，强制优化器使用指定的访问方法进行数据检索，要么是连续扫描，要么是索引扫描。
3
If the inner table does not have an index, the database server will compare the cost of building an index on the table to the cost of a sequential scan, and will choose the one with the least cost.