在 explain的帮助下,您就知道什么时候该给表添加索引,以使用索引来查找记录从而让select 运行更快。如果由于不恰当使用索引而引起一些问题的话,可以运行 analyze table来更新该表的统计信息,例如键的基数,它能帮您在优化方面做出更好的选择。explain 返回了一行记录,它包括了 ...
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数据库 时间:
2014-08-05 15:27:29
阅读次数:
354
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Ultra-QuickSort
Time Limit: 7000MS
Memory Limit: 65536K
Total Submissions: 40827
Accepted: 14752
Description
In this problem, you have to analyze a partic...
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其他好文 时间:
2014-08-04 21:45:18
阅读次数:
318
Oracle Database - Enterprise Edition - Version 8.1.7.4 and later Information in this document applies to any platform. **Checked for relevance 06-Apr-...
分类:
数据库 时间:
2014-08-04 10:45:27
阅读次数:
363
This paper attempts to analyze the characteristics from the attacker's point of view about the currentopen source rootkit key technology, hope can fin...
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系统相关 时间:
2014-08-02 18:18:34
阅读次数:
786
众所周知LoadRunner录制某个链接,包括动态请求与js、css、jpg等静态请求。
针对页面每一个请求元素,怎么定位具体分析呢?
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其他好文 时间:
2014-07-31 12:29:06
阅读次数:
289
Description
In this problem, you have to analyze a particular sorting algorithm. The algorithm processes a sequence of n distinct integers by swapping two adjacent sequence elements until the seq...
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其他好文 时间:
2014-07-30 12:22:33
阅读次数:
290
Mergeksorted linked lists and return it as one sorted list. Analyze and describe its complexity.题意:对k个有序的链表进行归并排序。并分析其复杂度。/** * Definition for singly-...
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其他好文 时间:
2014-07-29 11:02:16
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205
make -dshould give you more than enough information to debug your makefile.Be warned: it will take some time and effort to analyze the output but load...
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其他好文 时间:
2014-07-28 14:58:43
阅读次数:
490
Ultra-QuickSort
Time Limit: 7000MS
Memory Limit: 65536K
Total Submissions: 40427
Accepted: 14559
Description
In this problem, you have to analyze a particular sorting...
分类:
其他好文 时间:
2014-07-27 11:44:44
阅读次数:
251
题目:Merge k sorted linked lists and return it as one sorted list. Analyze and describe its complexity.题解:Merge k sorted linked list就是merge 2 sorted li....
分类:
编程语言 时间:
2014-07-26 05:44:37
阅读次数:
304