Sorting in Cassandra
The Cassandra distributed data store is, at heart, a key/value storage system. Unlike pure key/value storage systems, however, Cassandra implements first-class notions of key and column ordering. Dominic Williams covered a good chunk of the topic wonderfully in his post “Cassandra: RandomPartitioner vs OrderPreservingPartitionerâ€. But his framing of the question is a bit different than mine and wa
ソート時間ã®æ¯”較
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Microsoft's FDS data-sorter crushes Hadoop
Techies at Microsoft Research, the big brain arm of the software goliath, have taken the crown in the sorting benchmark world. The researchers are thinking about how to implement new sorting algorithms in the Bing search engine to give Microsoft a leg up on the MapReduce algorithms that underpin Google's search engine and other big data-munching applications. In the data world, the benchmarks agai
Sort Benchmark Home Page
New: The deadline for the 2023 sort contest is 31 December 2023. Background Until 2007, the sort benchmarks were primarily defined, sponsored and administered by Jim Gray. Following Jim's disappearance at sea in January 2007, the sort benchmarks have been continued by a committee of past colleagues and sort benchmark winners. The Sort Benchmark committee members include: Chris Nyberg of Ordinal Te
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基数ソート
public void sort(int[] a){ // ãƒã‚±ãƒ„ã«å…¥ã£ã¦ã„るデータ数を覚ãˆã‚‹ãŸã‚ã®é…列ã§ã™ int[] bn=new int[bucket.length]; // 最下ä½æ¡ã®æ•°å—を見ã¦ã€å¯¾å¿œã™ã‚‹ãƒã‚±ãƒ„ã«ãƒ‡ãƒ¼ã‚¿ã‚’入れã¾ã™ã€‚ for(int i=0;i<a.length;i++){ bucket[a[i]%m].add(new Integer(a[i])); notifier.notify(i,-1); } // 最åˆã®ãƒã‚±ãƒ„ã‹ã‚‰é †ç•ªã«ãƒ‡ãƒ¼ã‚¿ã‚’å–ã‚Šã ã—ã€ãƒ‡ãƒ¼ã‚¿ã®æŒ‡å®šæ¡ã®å€¤ã‚’見ã¦ã€ // 対応ã™ã‚‹ãƒã‚±ãƒ„ã«ãƒ‡ãƒ¼ã‚¿ã‚’è¿½åŠ ã—ã¾ã™ã€‚ for(int j=1;j<k;j++){ // ç¾åœ¨ã€ãã‚Œãžã‚Œã®ãƒã‚±ãƒ„ã«ä½•å€‹ã®ãƒ‡ãƒ¼ã‚¿ãŒå…¥ã£ã¦ã„ã‚‹ã‹ã‚’ // 覚ãˆã¦ãŠãã¾ã™ã€‚ for(int b=0;b<bucket.length;b++) bn[b]=bucket[b].num; // å„ãƒã‚±ãƒ„ã®å…ˆé
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2005.09.12ã€€æ ªå¼ä¼šç¤¾å››æ¬¡å…ƒãƒ‡ãƒ¼ã‚¿ã€€å®®æ¾¤äº†ç¥ Lucene 3ç« ã€€æ¤œç´¢ 3.1. 検索対象ã¨ãªã‚‹æƒ…å ± 3.2. 検索 3.3. 検索çµæžœ 3.4. 検索çµæžœã®çµžè¾¼ã¿ 3.5. 検索çµæžœã®ã‚½ãƒ¼ãƒˆ 3.4. 検索çµæžœã®çµžè¾¼ã¿ 検索çµæžœã®çµžã‚Šã“ã¿ã‚’è¡Œã„ãŸã„å ´åˆã¯ã€BooleanQueryクラスを用ã„ã¾ã™ã€‚ Query newQuery = QueryParser.parse(queryString,"content",analyzer); BooleanQuery bQuery = new BooleanQuery(); bQuery.add(oldQuery, true, false); bQuery.add(newQuery, true, false); Hits hits = indexSearcher.search(bQuery); BooleanQueryã®add()メソッドã§
Sorting Algorithms
Sorting Algorithms Demonstration in Java I wrote little of this code, and take no responsibility (nor credit) for any of it. If you have any other sorting algorithms you would like to see included on this list please send them to mailinglistsandjunkmailandcrap@wcgwave.ca. Demo Applet Algorithm Name Running Time (Efficiency) Stability Method Other notes Best Average Worst
ヒープソート - Wikipedia
ヒープソート (heap sort) ã¨ã¯ãƒªã‚¹ãƒˆã®ä¸¦ã¹æ›¿ãˆã‚’二分ヒープ木を用ã„ã¦è¡Œã†ã‚½ãƒ¼ãƒˆã®ã‚¢ãƒ«ã‚´ãƒªã‚ºãƒ ã§ã‚ã‚‹[2]ï¼ˆãƒ’ãƒ¼ãƒ—é ˜åŸŸã¨ã¯ç„¡é–¢ä¿‚ã§ã‚ã‚‹ã“ã¨ã«æ³¨æ„ã™ã‚‹ï¼‰ã€‚ アルゴリズムã¯ã€ä»¥ä¸‹ã®ã‚ˆã†ã«2ã¤ã®æ®µéšŽã‹ã‚‰æ§‹æˆã•ã‚Œã‚‹ã€‚ 未整列ã®ãƒªã‚¹ãƒˆã‹ã‚‰è¦ç´ ã‚’å–り出ã—ã€é †ã«ãƒ’ープã«è¿½åŠ ã™ã‚‹ã€‚ã™ã¹ã¦ã®è¦ç´ ã‚’è¿½åŠ ã™ã‚‹ã¾ã§ç¹°ã‚Šè¿”ã—。 ルート（最大値ã¾ãŸã¯æœ€å°å€¤)ã‚’å–り出ã—ã€æ•´åˆ—済ã¿ãƒªã‚¹ãƒˆã«è¿½åŠ ã™ã‚‹ã€‚ã™ã¹ã¦ã®è¦ç´ ã‚’å–り出ã™ã¾ã§ç¹°ã‚Šè¿”ã—。 計算é‡ã¯ O ã¨ãªã‚‹[2]。安定ソートã§ã¯ãªã„[2]。 ãƒ’ãƒ¼ãƒ—æ§‹é€ ã¯ã€ãƒã‚¤ãƒ³ã‚¿ç‰ã®åˆ¶å¾¡ç”¨ãƒ‡ãƒ¼ã‚¿ãŒä¸è¦ã§ã€ãƒ‡ãƒ¼ã‚¿è‡ªä½“ã®ä¸¦ã³é †ï¼ˆé…列）ã ã‘ã§è¡¨ç¾ã§ãã‚‹ã¨ã„ã†åˆ©ç‚¹ãŒã‚る。ヒープソートを実装ã™ã‚‹éš›ã«ã¯ã“ã®åˆ©ç‚¹ã‚’生ã‹ã—ã€å…ƒã®ãƒ‡ãƒ¼ã‚¿é ˜åŸŸã‚’ãã®ã¾ã¾ãƒ’ãƒ¼ãƒ—æ§‹é€ ã‚„æ•´åˆ—æ¸ˆã¿ãƒªã‚¹ãƒˆã«è»¢ç”¨ã™ã‚‹ã‚¤ãƒ³ãƒ—レースãªã‚½ãƒ¼ãƒˆã¨ã—ã¦å®Ÿè£…ã™ã‚‹ã“ã¨ãŒå¤šã„。 最åˆã«N個ã®ãƒ‡ãƒ¼ã‚¿ã‚’å«ã‚€é…列ãŒä¸Žãˆã‚‰ã‚Œã‚‹ã‚‚ã®ã¨ã™ã‚‹ã€‚æ·»å—ã¯1 〜
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MySQL Performance Blog » How fast can you sort data with MySQL ?
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CIS Department > Tutorials > Software Design Using C++ > External Sorting
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