l) 其他执行信息 (1)sort 算子,会显示排序信息 Sort Method代表排序的方法,包括quicksort(快排)和disksort(外排)。快排即内存够用时,所有的排序操作均在内存中完成,外排说明当前可用内存不足,需要下盘。 (2)hashjoin算子 Buckets:代表hash表中实际使用的桶的个数 Batches:代表hashjoin中实际分块的数量。如果Batch...
这个filesort是说, MySQL要多做一次额外的排序, 确切的说是快速排序(Quicksort). 先初步了解下Quicksort排序的概念(From Wikipedia). Quicksort is a divide and conquer algorithm. Quicksort first divides a large array into two smaller sub-arrays: the low elements and the high elements. Quicksort can ...
1. What is the difference between the worse case and the best case running time of a merge sort? 2. True or false? Let Ai and Ai+1 be the ith largest and the (i+1) largest elements in A. Any algorithm E...
The algorithm isn't simply returning the values that account for the biggest amount of the change. For example, if most (98%) sales came from the USA, then it would commonly be the case that most of the increase was also in the USA. Yet unless the USA or other countries/regions had...
Sort Selected rows were sorted using a sort algorithm. Union Merge The results of multiple subselects were merged or combined into a single result. Subquery Merge The results of multiple subselects were merged or combined into a single result. Bitmap Merge Multiple bitmaps were merged or combined...
A Cisco Proprietary Header for ILS Route-Strings used with SIP. Example: X-cisco-dest-route-string: <sip:configured-value> ENUM ENUM is a protocol that uses Domain Name Service (DNS) to translate E164 phone numbers into URIs. This is not covered in this document. PSTN Pub...
Most people have no idea how computers work or what an algorithm is; as a result, they are inclined to view computer-generated content as impartial or objective (Fast & Jago, 2020; Logg et al., 2018). This trust has also been driven by the positive image Big Tech companies have had...
Computer networks are a bit like the army: everything in a network has to be arranged with almost military precision and it has to behave according to very clearly defined rules. In a LAN, for example, you can't connect things together any old how: all the nodes (computers and other ...
Seems to me, it simply means "has that playing position (i.e. the current state) been reached by pitting 'the algorithm' vs. any particular genuine chess-engine". (Or otherwise. The alternative, presumably, that it was a 'hand-crafted' response on Randall's part... Or possibly a volu...
with 48 commentsFrom Stack Overflow: Can anyone give me a good example of when CROSS APPLY makes a difference in those cases where INNER JOIN will work as well? This is of course SQL Server. A quick reminder on the terms. INNER JOIN is the most used construct in SQL: it joins two ...