internal and external sorting

Sort within: Refers to the sort of memory in which the data objects are all stored during sorting.

Out-of-order: refers to the ordering of all objects in the sort period that are too many, cannot be stored in memory at the same time, and must be moved between external memory according to the requirements of the ordering process.

Sort by: sort and outer sort, depending on where the sort element is located .

inside Sort: In the sort process, all the elements are transferred to the in-memory sort, called the inner sort. The inner sort is the basis for sorting. The efficiency of the internal sorting is measured by the number of comparisons. According to the strategy used, the inner sort can be divided into several categories, such as inserting sort, choosing sort, exchanging sort, merging sort and cardinal sort.
out -of-order: In the case of large amounts of data, you can only sort the blocks, but there is no guarantee of order between blocks and blocks. The number of read/write external memory is used to measure the efficiency of the external sort.

internal and external sorting