Document (#31989)

Author

Leyh, M.

Title

¬Das Google File System

Imprint

Münster : Institut für Wirtschaftsinformatik der Westfälische Wilhelms-Universität Münster

Year

2005

Pages

23 S

Abstract

Die Bedeutung der Suchmaschine Google hat in den letzten Jahren sehr stark zuge-nommen. Durch die immer komplexer werdenden Googleapplikationen sowie die im-mer stärkere Nutzung der Suchmaschine ist die zu verwaltende Datenmenge in den letzten Jahren stark angewachsen. Dies war die Ursache für die Entwicklung neuer Konzepte, um eine konsistente Datenhaltung und -verwaltung sowie eine schnelle Da-tenrettung zu ermöglichen. Im Mittelpunkt dieser Entwicklung steht die Sicherung der Performance des Systems, das Milliarden von Dokumenten verwaltet und mehrere Tausende Treffer pro Suchanfrage nach Relevanz ordnet. Der Umfang und die Komple-xität des Systems stellen dabei sowohl besondere Herausforderungen an die einzuset-zende Hardware, als auch an die Konzepte der Datenverteilung und -sicherung. Eine neue Entwicklung ist dabei der Verzicht auf teure Spezialhardware. Alle Anwendungen laufen auf gewöhnlicher PC-Hardware und sind somit sehr wirtschaftlich im Vergleich zu teurerer Spezialhardware. Durch den Einsatz gewöhnlicher PC-Hardware sind Aus-fälle von Festplatten oder ganzer Server wesentlich wahrscheinlicher, es wird sogar mit dem Ausfall von Systemen gerechnet. Dass Anwendungen dennoch so zuverlässig und schnell funktionieren, liegt an der Struktur des von Google entwickelten Dateisystems. Das Google File Systems (kurz GFS) bietet eine hohe Fehlertoleranz, Fehler werden automatisch entdeckt und Wiederherstellungen automatisiert ausgeführt, so dass die Nachteile der Hardwarekonfiguration abgefangen werden können. Dieser Fehlertoleranz kommt bei multiplen Clustern mit Größen von bis zu 300 TB sowie mehreren hunderten Clientzugriffen sehr große Bedeutung zu. Eine weitere strukturelle Besonderheit des Google File Systems stellt die Verwaltung von Schreibzugriffen dar. Bestehende Dateien werden nicht durch schwer zu kontrollie-rende Schreiboperationen, sondern vielmehr durch leichter zu verwaltende "Append" Operationen erweitert. Es ist somit möglich, dass viele Nutzer gleichzeitig auf größere Dateien schreibend zugreifen, ohne dass eine ständige Synchronisation zwischen diesen Nutzern stattfinden muss. Die dadurch realisierten Vorteile bezüglich Performance, Verlässlichkeit und Verfüg-barkeit sowie die daraus resultierenden Anforderungen an das System sollen im Mittel-punkt dieser Arbeit stehen. Es soll ein Einblick in die Funktionsweisen und Komplexitä-ten des Google File Systems gegeben und weiterhin die strukturelle Umsetzung der Anforderungen aufgezeigt werden.

Content

Ausarbeitung im Rahmen des Seminars Suchmaschinen und Suchalgorithmen, Institut für Wirtschaftsinformatik Praktische Informatik in der Wirtschaft, Westfälische Wilhelms-Universität Münster. - Vgl.: http://www-wi.uni-muenster.de/pi/lehre/ss05/seminarSuchen/Ausarbeitungen/MichaelLeyh.pdf

Theme

Suchmaschinen

Object

Google

Similar documents (author)

1. Leyh, G.: ¬Das Dogma von der systematischen Aufstellung : T.1 (1912) 6.09

   6.094361 = sum of:
     6.094361 = weight(author_txt:leyh in 565) [ClassicSimilarity], result of:
       6.094361 = fieldWeight in 565, product of:
         1.0 = tf(freq=1.0), with freq of:
           1.0 = termFreq=1.0
         9.7509775 = idf(docFreq=6, maxDocs=44218)
         0.625 = fieldNorm(doc=565)
   

2. Leyh, G.: ¬Das Dogma von der systematischen Aufstellung : T.2 (1913) 6.09

   6.094361 = sum of:
     6.094361 = weight(author_txt:leyh in 587) [ClassicSimilarity], result of:
       6.094361 = fieldWeight in 587, product of:
         1.0 = tf(freq=1.0), with freq of:
           1.0 = termFreq=1.0
         9.7509775 = idf(docFreq=6, maxDocs=44218)
         0.625 = fieldNorm(doc=587)
   

3. Leyh, G.: Aufstellung und Signaturen (1961) 6.09

   6.094361 = sum of:
     6.094361 = weight(author_txt:leyh in 2055) [ClassicSimilarity], result of:
       6.094361 = fieldWeight in 2055, product of:
         1.0 = tf(freq=1.0), with freq of:
           1.0 = termFreq=1.0
         9.7509775 = idf(docFreq=6, maxDocs=44218)
         0.625 = fieldNorm(doc=2055)
   

4. Leyh, G.: Systematische oder mechanische Aufstellung? (1914) 6.09

   6.094361 = sum of:
     6.094361 = weight(author_txt:leyh in 2894) [ClassicSimilarity], result of:
       6.094361 = fieldWeight in 2894, product of:
         1.0 = tf(freq=1.0), with freq of:
           1.0 = termFreq=1.0
         9.7509775 = idf(docFreq=6, maxDocs=44218)
         0.625 = fieldNorm(doc=2894)
   

5. Koch, C.; Leyh, A.: Was ist Bewusstsein? : Im Gespräch mit Christof Koch. (2010) 4.88

   4.8754888 = sum of:
     4.8754888 = weight(author_txt:leyh in 4562) [ClassicSimilarity], result of:
       4.8754888 = fieldWeight in 4562, product of:
         1.0 = tf(freq=1.0), with freq of:
           1.0 = termFreq=1.0
         9.7509775 = idf(docFreq=6, maxDocs=44218)
         0.5 = fieldNorm(doc=4562)
   

Similar documents (content)

1. Wei, W.: SOAP als Basis für verteilte, heterogene virtuelle OPACs (2002) 0.40

   0.39610893 = sum of:
     0.39610893 = product of:
       0.76174796 = sum of:
         0.031400528 = weight(abstract_txt:jahren in 4097) [ClassicSimilarity], result of:
           0.031400528 = score(doc=4097,freq=1.0), product of:
             0.111890756 = queryWeight, product of:
               5.1316223 = idf(docFreq=709, maxDocs=44218)
               0.021804169 = queryNorm
             0.2806356 = fieldWeight in 4097, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               5.1316223 = idf(docFreq=709, maxDocs=44218)
               0.0546875 = fieldNorm(doc=4097)
         0.046599884 = weight(abstract_txt:letzten in 4097) [ClassicSimilarity], result of:
           0.046599884 = score(doc=4097,freq=1.0), product of:
             0.14557701 = queryWeight, product of:
               1.1406418 = boost
               5.853343 = idf(docFreq=344, maxDocs=44218)
               0.021804169 = queryNorm
             0.3201047 = fieldWeight in 4097, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               5.853343 = idf(docFreq=344, maxDocs=44218)
               0.0546875 = fieldNorm(doc=4097)
         0.05472349 = weight(abstract_txt:anwendungen in 4097) [ClassicSimilarity], result of:
           0.05472349 = score(doc=4097,freq=1.0), product of:
             0.1620387 = queryWeight, product of:
               1.2034062 = boost
               6.1754265 = idf(docFreq=249, maxDocs=44218)
               0.021804169 = queryNorm
             0.33771864 = fieldWeight in 4097, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               6.1754265 = idf(docFreq=249, maxDocs=44218)
               0.0546875 = fieldNorm(doc=4097)
         0.061015747 = weight(abstract_txt:konzepte in 4097) [ClassicSimilarity], result of:
           0.061015747 = score(doc=4097,freq=1.0), product of:
             0.17423318 = queryWeight, product of:
               1.2478671 = boost
               6.4035826 = idf(docFreq=198, maxDocs=44218)
               0.021804169 = queryNorm
             0.3501959 = fieldWeight in 4097, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               6.4035826 = idf(docFreq=198, maxDocs=44218)
               0.0546875 = fieldNorm(doc=4097)
         0.100980565 = weight(abstract_txt:stark in 4097) [ClassicSimilarity], result of:
           0.100980565 = score(doc=4097,freq=2.0), product of:
             0.19348684 = queryWeight, product of:
               1.3150086 = boost
               6.7481275 = idf(docFreq=140, maxDocs=44218)
               0.021804169 = queryNorm
             0.52189887 = fieldWeight in 4097, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               6.7481275 = idf(docFreq=140, maxDocs=44218)
               0.0546875 = fieldNorm(doc=4097)
         0.02003243 = weight(abstract_txt:werden in 4097) [ClassicSimilarity], result of:
           0.02003243 = score(doc=4097,freq=1.0), product of:
             0.1044725 = queryWeight, product of:
               1.3665291 = boost
               3.5062556 = idf(docFreq=3606, maxDocs=44218)
               0.021804169 = queryNorm
             0.19174835 = fieldWeight in 4097, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               3.5062556 = idf(docFreq=3606, maxDocs=44218)
               0.0546875 = fieldNorm(doc=4097)
         0.08150824 = weight(abstract_txt:verwaltung in 4097) [ClassicSimilarity], result of:
           0.08150824 = score(doc=4097,freq=1.0), product of:
             0.2113346 = queryWeight, product of:
               1.374321 = boost
               7.0524964 = idf(docFreq=103, maxDocs=44218)
               0.021804169 = queryNorm
             0.3856834 = fieldWeight in 4097, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               7.0524964 = idf(docFreq=103, maxDocs=44218)
               0.0546875 = fieldNorm(doc=4097)
         0.07706046 = weight(abstract_txt:entwicklung in 4097) [ClassicSimilarity], result of:
           0.07706046 = score(doc=4097,freq=3.0), product of:
             0.1615774 = queryWeight, product of:
               1.4717662 = boost
               5.0350323 = idf(docFreq=781, maxDocs=44218)
               0.021804169 = queryNorm
             0.47692597 = fieldWeight in 4097, product of:
               1.7320508 = tf(freq=3.0), with freq of:
                 3.0 = termFreq=3.0
               5.0350323 = idf(docFreq=781, maxDocs=44218)
               0.0546875 = fieldNorm(doc=4097)
         0.050359815 = weight(abstract_txt:durch in 4097) [ClassicSimilarity], result of:
           0.050359815 = score(doc=4097,freq=2.0), product of:
             0.15330595 = queryWeight, product of:
               1.6553788 = boost
               4.2473893 = idf(docFreq=1718, maxDocs=44218)
               0.021804169 = queryNorm
             0.32849225 = fieldWeight in 4097, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               4.2473893 = idf(docFreq=1718, maxDocs=44218)
               0.0546875 = fieldNorm(doc=4097)
         0.03262936 = weight(abstract_txt:systems in 4097) [ClassicSimilarity], result of:
           0.03262936 = score(doc=4097,freq=2.0), product of:
             0.12365507 = queryWeight, product of:
               1.662183 = boost
               3.4118783 = idf(docFreq=3963, maxDocs=44218)
               0.021804169 = queryNorm
             0.263874 = fieldWeight in 4097, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               3.4118783 = idf(docFreq=3963, maxDocs=44218)
               0.0546875 = fieldNorm(doc=4097)
         0.07440149 = weight(abstract_txt:dass in 4097) [ClassicSimilarity], result of:
           0.07440149 = score(doc=4097,freq=3.0), product of:
             0.17372417 = queryWeight, product of:
               1.7621708 = boost
               4.5213976 = idf(docFreq=1306, maxDocs=44218)
               0.021804169 = queryNorm
             0.42827368 = fieldWeight in 4097, product of:
               1.7320508 = tf(freq=3.0), with freq of:
                 3.0 = termFreq=3.0
               4.5213976 = idf(docFreq=1306, maxDocs=44218)
               0.0546875 = fieldNorm(doc=4097)
         0.064820096 = weight(abstract_txt:sowie in 4097) [ClassicSimilarity], result of:
           0.064820096 = score(doc=4097,freq=2.0), product of:
             0.18140225 = queryWeight, product of:
               1.8006911 = boost
               4.6202335 = idf(docFreq=1183, maxDocs=44218)
               0.021804169 = queryNorm
             0.35732794 = fieldWeight in 4097, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               4.6202335 = idf(docFreq=1183, maxDocs=44218)
               0.0546875 = fieldNorm(doc=4097)
         0.06621578 = weight(abstract_txt:eine in 4097) [ClassicSimilarity], result of:
           0.06621578 = score(doc=4097,freq=5.0), product of:
             0.15518902 = queryWeight, product of:
               2.0398302 = boost
               3.4892128 = idf(docFreq=3668, maxDocs=44218)
               0.021804169 = queryNorm
             0.42667827 = fieldWeight in 4097, product of:
               2.236068 = tf(freq=5.0), with freq of:
                 5.0 = termFreq=5.0
               3.4892128 = idf(docFreq=3668, maxDocs=44218)
               0.0546875 = fieldNorm(doc=4097)
       0.52 = coord(13/25)
   

2. Sadrozinski, J.: Suchmaschinen und öffentlich-rechtlicher Onlinejournalismus am Beispiel tagesschau.de (2007) 0.34

   0.3422328 = sum of:
     0.3422328 = product of:
       0.85558194 = sum of:
         0.043425016 = weight(abstract_txt:bedeutung in 375) [ClassicSimilarity], result of:
           0.043425016 = score(doc=375,freq=1.0), product of:
             0.12705788 = queryWeight, product of:
               1.0656233 = boost
               5.468376 = idf(docFreq=506, maxDocs=44218)
               0.021804169 = queryNorm
             0.3417735 = fieldWeight in 375, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               5.468376 = idf(docFreq=506, maxDocs=44218)
               0.0625 = fieldNorm(doc=375)
         0.0702297 = weight(abstract_txt:suchmaschine in 375) [ClassicSimilarity], result of:
           0.0702297 = score(doc=375,freq=1.0), product of:
             0.17506076 = queryWeight, product of:
               1.2508272 = boost
               6.4187727 = idf(docFreq=195, maxDocs=44218)
               0.021804169 = queryNorm
             0.4011733 = fieldWeight in 375, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               6.4187727 = idf(docFreq=195, maxDocs=44218)
               0.0625 = fieldNorm(doc=375)
         0.07460501 = weight(abstract_txt:somit in 375) [ClassicSimilarity], result of:
           0.07460501 = score(doc=375,freq=1.0), product of:
             0.18225814 = queryWeight, product of:
               1.2762811 = boost
               6.5493927 = idf(docFreq=171, maxDocs=44218)
               0.021804169 = queryNorm
             0.40933704 = fieldWeight in 375, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               6.5493927 = idf(docFreq=171, maxDocs=44218)
               0.0625 = fieldNorm(doc=375)
         0.033373237 = weight(abstract_txt:dieser in 375) [ClassicSimilarity], result of:
           0.033373237 = score(doc=375,freq=1.0), product of:
             0.12203121 = queryWeight, product of:
               1.2790396 = boost
               4.3756986 = idf(docFreq=1511, maxDocs=44218)
               0.021804169 = queryNorm
             0.27348116 = fieldWeight in 375, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               4.3756986 = idf(docFreq=1511, maxDocs=44218)
               0.0625 = fieldNorm(doc=375)
         0.0323773 = weight(abstract_txt:werden in 375) [ClassicSimilarity], result of:
           0.0323773 = score(doc=375,freq=2.0), product of:
             0.1044725 = queryWeight, product of:
               1.3665291 = boost
               3.5062556 = idf(docFreq=3606, maxDocs=44218)
               0.021804169 = queryNorm
             0.30991215 = fieldWeight in 375, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               3.5062556 = idf(docFreq=3606, maxDocs=44218)
               0.0625 = fieldNorm(doc=375)
         0.050846715 = weight(abstract_txt:entwicklung in 375) [ClassicSimilarity], result of:
           0.050846715 = score(doc=375,freq=1.0), product of:
             0.1615774 = queryWeight, product of:
               1.4717662 = boost
               5.0350323 = idf(docFreq=781, maxDocs=44218)
               0.021804169 = queryNorm
             0.31468952 = fieldWeight in 375, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               5.0350323 = idf(docFreq=781, maxDocs=44218)
               0.0625 = fieldNorm(doc=375)
         0.057554074 = weight(abstract_txt:durch in 375) [ClassicSimilarity], result of:
           0.057554074 = score(doc=375,freq=2.0), product of:
             0.15330595 = queryWeight, product of:
               1.6553788 = boost
               4.2473893 = idf(docFreq=1718, maxDocs=44218)
               0.021804169 = queryNorm
             0.3754197 = fieldWeight in 375, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               4.2473893 = idf(docFreq=1718, maxDocs=44218)
               0.0625 = fieldNorm(doc=375)
         0.06942693 = weight(abstract_txt:dass in 375) [ClassicSimilarity], result of:
           0.06942693 = score(doc=375,freq=2.0), product of:
             0.17372417 = queryWeight, product of:
               1.7621708 = boost
               4.5213976 = idf(docFreq=1306, maxDocs=44218)
               0.021804169 = queryNorm
             0.39963886 = fieldWeight in 375, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               4.5213976 = idf(docFreq=1306, maxDocs=44218)
               0.0625 = fieldNorm(doc=375)
         0.03384297 = weight(abstract_txt:eine in 375) [ClassicSimilarity], result of:
           0.03384297 = score(doc=375,freq=1.0), product of:
             0.15518902 = queryWeight, product of:
               2.0398302 = boost
               3.4892128 = idf(docFreq=3668, maxDocs=44218)
               0.021804169 = queryNorm
             0.2180758 = fieldWeight in 375, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               3.4892128 = idf(docFreq=3668, maxDocs=44218)
               0.0625 = fieldNorm(doc=375)
         0.38990098 = weight(abstract_txt:google in 375) [ClassicSimilarity], result of:
           0.38990098 = score(doc=375,freq=10.0), product of:
             0.36743873 = queryWeight, product of:
               3.1387446 = boost
               5.3689504 = idf(docFreq=559, maxDocs=44218)
               0.021804169 = queryNorm
             1.061132 = fieldWeight in 375, product of:
               3.1622777 = tf(freq=10.0), with freq of:
                 10.0 = termFreq=10.0
               5.3689504 = idf(docFreq=559, maxDocs=44218)
               0.0625 = fieldNorm(doc=375)
       0.4 = coord(10/25)
   

3. Korves, J.: Seiten bewerten : Googles PageRank (2005) 0.32

   0.3248215 = sum of:
     0.3248215 = product of:
       0.6767115 = sum of:
         0.026914738 = weight(abstract_txt:jahren in 866) [ClassicSimilarity], result of:
           0.026914738 = score(doc=866,freq=1.0), product of:
             0.111890756 = queryWeight, product of:
               5.1316223 = idf(docFreq=709, maxDocs=44218)
               0.021804169 = queryNorm
             0.2405448 = fieldWeight in 866, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               5.1316223 = idf(docFreq=709, maxDocs=44218)
               0.046875 = fieldNorm(doc=866)
         0.039942756 = weight(abstract_txt:letzten in 866) [ClassicSimilarity], result of:
           0.039942756 = score(doc=866,freq=1.0), product of:
             0.14557701 = queryWeight, product of:
               1.1406418 = boost
               5.853343 = idf(docFreq=344, maxDocs=44218)
               0.021804169 = queryNorm
             0.27437544 = fieldWeight in 866, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               5.853343 = idf(docFreq=344, maxDocs=44218)
               0.046875 = fieldNorm(doc=866)
         0.074489854 = weight(abstract_txt:suchmaschine in 866) [ClassicSimilarity], result of:
           0.074489854 = score(doc=866,freq=2.0), product of:
             0.17506076 = queryWeight, product of:
               1.2508272 = boost
               6.4187727 = idf(docFreq=195, maxDocs=44218)
               0.021804169 = queryNorm
             0.42550856 = fieldWeight in 866, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               6.4187727 = idf(docFreq=195, maxDocs=44218)
               0.046875 = fieldNorm(doc=866)
         0.02502993 = weight(abstract_txt:dieser in 866) [ClassicSimilarity], result of:
           0.02502993 = score(doc=866,freq=1.0), product of:
             0.12203121 = queryWeight, product of:
               1.2790396 = boost
               4.3756986 = idf(docFreq=1511, maxDocs=44218)
               0.021804169 = queryNorm
             0.20511088 = fieldWeight in 866, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               4.3756986 = idf(docFreq=1511, maxDocs=44218)
               0.046875 = fieldNorm(doc=866)
         0.061203465 = weight(abstract_txt:stark in 866) [ClassicSimilarity], result of:
           0.061203465 = score(doc=866,freq=1.0), product of:
             0.19348684 = queryWeight, product of:
               1.3150086 = boost
               6.7481275 = idf(docFreq=140, maxDocs=44218)
               0.021804169 = queryNorm
             0.31631848 = fieldWeight in 866, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               6.7481275 = idf(docFreq=140, maxDocs=44218)
               0.046875 = fieldNorm(doc=866)
         0.048565947 = weight(abstract_txt:werden in 866) [ClassicSimilarity], result of:
           0.048565947 = score(doc=866,freq=8.0), product of:
             0.1044725 = queryWeight, product of:
               1.3665291 = boost
               3.5062556 = idf(docFreq=3606, maxDocs=44218)
               0.021804169 = queryNorm
             0.46486822 = fieldWeight in 866, product of:
               2.828427 = tf(freq=8.0), with freq of:
                 8.0 = termFreq=8.0
               3.5062556 = idf(docFreq=3606, maxDocs=44218)
               0.046875 = fieldNorm(doc=866)
         0.03052266 = weight(abstract_txt:durch in 866) [ClassicSimilarity], result of:
           0.03052266 = score(doc=866,freq=1.0), product of:
             0.15330595 = queryWeight, product of:
               1.6553788 = boost
               4.2473893 = idf(docFreq=1718, maxDocs=44218)
               0.021804169 = queryNorm
             0.19909638 = fieldWeight in 866, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               4.2473893 = idf(docFreq=1718, maxDocs=44218)
               0.046875 = fieldNorm(doc=866)
         0.07686144 = weight(abstract_txt:sehr in 866) [ClassicSimilarity], result of:
           0.07686144 = score(doc=866,freq=2.0), product of:
             0.20462571 = queryWeight, product of:
               1.6562604 = boost
               5.666202 = idf(docFreq=415, maxDocs=44218)
               0.021804169 = queryNorm
             0.37561968 = fieldWeight in 866, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               5.666202 = idf(docFreq=415, maxDocs=44218)
               0.046875 = fieldNorm(doc=866)
         0.052070197 = weight(abstract_txt:dass in 866) [ClassicSimilarity], result of:
           0.052070197 = score(doc=866,freq=2.0), product of:
             0.17372417 = queryWeight, product of:
               1.7621708 = boost
               4.5213976 = idf(docFreq=1306, maxDocs=44218)
               0.021804169 = queryNorm
             0.29972914 = fieldWeight in 866, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               4.5213976 = idf(docFreq=1306, maxDocs=44218)
               0.046875 = fieldNorm(doc=866)
         0.05556008 = weight(abstract_txt:sowie in 866) [ClassicSimilarity], result of:
           0.05556008 = score(doc=866,freq=2.0), product of:
             0.18140225 = queryWeight, product of:
               1.8006911 = boost
               4.6202335 = idf(docFreq=1183, maxDocs=44218)
               0.021804169 = queryNorm
             0.3062811 = fieldWeight in 866, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               4.6202335 = idf(docFreq=1183, maxDocs=44218)
               0.046875 = fieldNorm(doc=866)
         0.025382226 = weight(abstract_txt:eine in 866) [ClassicSimilarity], result of:
           0.025382226 = score(doc=866,freq=1.0), product of:
             0.15518902 = queryWeight, product of:
               2.0398302 = boost
               3.4892128 = idf(docFreq=3668, maxDocs=44218)
               0.021804169 = queryNorm
             0.16355684 = fieldWeight in 866, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               3.4892128 = idf(docFreq=3668, maxDocs=44218)
               0.046875 = fieldNorm(doc=866)
         0.16016817 = weight(abstract_txt:google in 866) [ClassicSimilarity], result of:
           0.16016817 = score(doc=866,freq=3.0), product of:
             0.36743873 = queryWeight, product of:
               3.1387446 = boost
               5.3689504 = idf(docFreq=559, maxDocs=44218)
               0.021804169 = queryNorm
             0.43590444 = fieldWeight in 866, product of:
               1.7320508 = tf(freq=3.0), with freq of:
                 3.0 = termFreq=3.0
               5.3689504 = idf(docFreq=559, maxDocs=44218)
               0.046875 = fieldNorm(doc=866)
       0.48 = coord(12/25)
   

4. Lewandowski, D.: Web Information Retrieval : Technologien zur Informationssuche im Internet (2005) 0.26

   0.25700644 = sum of:
     0.25700644 = product of:
       0.5354301 = sum of:
         0.017943159 = weight(abstract_txt:jahren in 3635) [ClassicSimilarity], result of:
           0.017943159 = score(doc=3635,freq=1.0), product of:
             0.111890756 = queryWeight, product of:
               5.1316223 = idf(docFreq=709, maxDocs=44218)
               0.021804169 = queryNorm
             0.1603632 = fieldWeight in 3635, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               5.1316223 = idf(docFreq=709, maxDocs=44218)
               0.03125 = fieldNorm(doc=3635)
         0.048550647 = weight(abstract_txt:bedeutung in 3635) [ClassicSimilarity], result of:
           0.048550647 = score(doc=3635,freq=5.0), product of:
             0.12705788 = queryWeight, product of:
               1.0656233 = boost
               5.468376 = idf(docFreq=506, maxDocs=44218)
               0.021804169 = queryNorm
             0.3821144 = fieldWeight in 3635, product of:
               2.236068 = tf(freq=5.0), with freq of:
                 5.0 = termFreq=5.0
               5.468376 = idf(docFreq=506, maxDocs=44218)
               0.03125 = fieldNorm(doc=3635)
         0.046121925 = weight(abstract_txt:letzten in 3635) [ClassicSimilarity], result of:
           0.046121925 = score(doc=3635,freq=3.0), product of:
             0.14557701 = queryWeight, product of:
               1.1406418 = boost
               5.853343 = idf(docFreq=344, maxDocs=44218)
               0.021804169 = queryNorm
             0.3168215 = fieldWeight in 3635, product of:
               1.7320508 = tf(freq=3.0), with freq of:
                 3.0 = termFreq=3.0
               5.853343 = idf(docFreq=344, maxDocs=44218)
               0.03125 = fieldNorm(doc=3635)
         0.031270564 = weight(abstract_txt:anwendungen in 3635) [ClassicSimilarity], result of:
           0.031270564 = score(doc=3635,freq=1.0), product of:
             0.1620387 = queryWeight, product of:
               1.2034062 = boost
               6.1754265 = idf(docFreq=249, maxDocs=44218)
               0.021804169 = queryNorm
             0.19298208 = fieldWeight in 3635, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               6.1754265 = idf(docFreq=249, maxDocs=44218)
               0.03125 = fieldNorm(doc=3635)
         0.016686618 = weight(abstract_txt:dieser in 3635) [ClassicSimilarity], result of:
           0.016686618 = score(doc=3635,freq=1.0), product of:
             0.12203121 = queryWeight, product of:
               1.2790396 = boost
               4.3756986 = idf(docFreq=1511, maxDocs=44218)
               0.021804169 = queryNorm
             0.13674058 = fieldWeight in 3635, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               4.3756986 = idf(docFreq=1511, maxDocs=44218)
               0.03125 = fieldNorm(doc=3635)
         0.057703175 = weight(abstract_txt:stark in 3635) [ClassicSimilarity], result of:
           0.057703175 = score(doc=3635,freq=2.0), product of:
             0.19348684 = queryWeight, product of:
               1.3150086 = boost
               6.7481275 = idf(docFreq=140, maxDocs=44218)
               0.021804169 = queryNorm
             0.2982279 = fieldWeight in 3635, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               6.7481275 = idf(docFreq=140, maxDocs=44218)
               0.03125 = fieldNorm(doc=3635)
         0.030286187 = weight(abstract_txt:werden in 3635) [ClassicSimilarity], result of:
           0.030286187 = score(doc=3635,freq=7.0), product of:
             0.1044725 = queryWeight, product of:
               1.3665291 = boost
               3.5062556 = idf(docFreq=3606, maxDocs=44218)
               0.021804169 = queryNorm
             0.28989625 = fieldWeight in 3635, product of:
               2.6457512 = tf(freq=7.0), with freq of:
                 7.0 = termFreq=7.0
               3.5062556 = idf(docFreq=3606, maxDocs=44218)
               0.03125 = fieldNorm(doc=3635)
         0.045500495 = weight(abstract_txt:durch in 3635) [ClassicSimilarity], result of:
           0.045500495 = score(doc=3635,freq=5.0), product of:
             0.15330595 = queryWeight, product of:
               1.6553788 = boost
               4.2473893 = idf(docFreq=1718, maxDocs=44218)
               0.021804169 = queryNorm
             0.29679537 = fieldWeight in 3635, product of:
               2.236068 = tf(freq=5.0), with freq of:
                 5.0 = termFreq=5.0
               4.2473893 = idf(docFreq=1718, maxDocs=44218)
               0.03125 = fieldNorm(doc=3635)
         0.054886807 = weight(abstract_txt:dass in 3635) [ClassicSimilarity], result of:
           0.054886807 = score(doc=3635,freq=5.0), product of:
             0.17372417 = queryWeight, product of:
               1.7621708 = boost
               4.5213976 = idf(docFreq=1306, maxDocs=44218)
               0.021804169 = queryNorm
             0.31594226 = fieldWeight in 3635, product of:
               2.236068 = tf(freq=5.0), with freq of:
                 5.0 = termFreq=5.0
               4.5213976 = idf(docFreq=1306, maxDocs=44218)
               0.03125 = fieldNorm(doc=3635)
         0.026191274 = weight(abstract_txt:sowie in 3635) [ClassicSimilarity], result of:
           0.026191274 = score(doc=3635,freq=1.0), product of:
             0.18140225 = queryWeight, product of:
               1.8006911 = boost
               4.6202335 = idf(docFreq=1183, maxDocs=44218)
               0.021804169 = queryNorm
             0.1443823 = fieldWeight in 3635, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               4.6202335 = idf(docFreq=1183, maxDocs=44218)
               0.03125 = fieldNorm(doc=3635)
         0.05351043 = weight(abstract_txt:eine in 3635) [ClassicSimilarity], result of:
           0.05351043 = score(doc=3635,freq=10.0), product of:
             0.15518902 = queryWeight, product of:
               2.0398302 = boost
               3.4892128 = idf(docFreq=3668, maxDocs=44218)
               0.021804169 = queryNorm
             0.3448081 = fieldWeight in 3635, product of:
               3.1622777 = tf(freq=10.0), with freq of:
                 10.0 = termFreq=10.0
               3.4892128 = idf(docFreq=3668, maxDocs=44218)
               0.03125 = fieldNorm(doc=3635)
         0.10677878 = weight(abstract_txt:google in 3635) [ClassicSimilarity], result of:
           0.10677878 = score(doc=3635,freq=3.0), product of:
             0.36743873 = queryWeight, product of:
               3.1387446 = boost
               5.3689504 = idf(docFreq=559, maxDocs=44218)
               0.021804169 = queryNorm
             0.29060295 = fieldWeight in 3635, product of:
               1.7320508 = tf(freq=3.0), with freq of:
                 3.0 = termFreq=3.0
               5.3689504 = idf(docFreq=559, maxDocs=44218)
               0.03125 = fieldNorm(doc=3635)
       0.48 = coord(12/25)
   

5. Kanaeva, Z.: Ranking: Google und CiteSeer (2005) 0.25

   0.24670462 = sum of:
     0.24670462 = product of:
       0.770952 = sum of:
         0.08716536 = weight(abstract_txt:konzepte in 3276) [ClassicSimilarity], result of:
           0.08716536 = score(doc=3276,freq=1.0), product of:
             0.17423318 = queryWeight, product of:
               1.2478671 = boost
               6.4035826 = idf(docFreq=198, maxDocs=44218)
               0.021804169 = queryNorm
             0.5002799 = fieldWeight in 3276, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               6.4035826 = idf(docFreq=198, maxDocs=44218)
               0.078125 = fieldNorm(doc=3276)
         0.12414975 = weight(abstract_txt:suchmaschine in 3276) [ClassicSimilarity], result of:
           0.12414975 = score(doc=3276,freq=2.0), product of:
             0.17506076 = queryWeight, product of:
               1.2508272 = boost
               6.4187727 = idf(docFreq=195, maxDocs=44218)
               0.021804169 = queryNorm
             0.7091809 = fieldWeight in 3276, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               6.4187727 = idf(docFreq=195, maxDocs=44218)
               0.078125 = fieldNorm(doc=3276)
         0.09058208 = weight(abstract_txt:sehr in 3276) [ClassicSimilarity], result of:
           0.09058208 = score(doc=3276,freq=1.0), product of:
             0.20462571 = queryWeight, product of:
               1.6562604 = boost
               5.666202 = idf(docFreq=415, maxDocs=44218)
               0.021804169 = queryNorm
             0.44267204 = fieldWeight in 3276, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               5.666202 = idf(docFreq=415, maxDocs=44218)
               0.078125 = fieldNorm(doc=3276)
         0.032960627 = weight(abstract_txt:systems in 3276) [ClassicSimilarity], result of:
           0.032960627 = score(doc=3276,freq=1.0), product of:
             0.12365507 = queryWeight, product of:
               1.662183 = boost
               3.4118783 = idf(docFreq=3963, maxDocs=44218)
               0.021804169 = queryNorm
             0.26655298 = fieldWeight in 3276, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               3.4118783 = idf(docFreq=3963, maxDocs=44218)
               0.078125 = fieldNorm(doc=3276)
         0.061365314 = weight(abstract_txt:dass in 3276) [ClassicSimilarity], result of:
           0.061365314 = score(doc=3276,freq=1.0), product of:
             0.17372417 = queryWeight, product of:
               1.7621708 = boost
               4.5213976 = idf(docFreq=1306, maxDocs=44218)
               0.021804169 = queryNorm
             0.35323417 = fieldWeight in 3276, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               4.5213976 = idf(docFreq=1306, maxDocs=44218)
               0.078125 = fieldNorm(doc=3276)
         0.06547818 = weight(abstract_txt:sowie in 3276) [ClassicSimilarity], result of:
           0.06547818 = score(doc=3276,freq=1.0), product of:
             0.18140225 = queryWeight, product of:
               1.8006911 = boost
               4.6202335 = idf(docFreq=1183, maxDocs=44218)
               0.021804169 = queryNorm
             0.36095574 = fieldWeight in 3276, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               4.6202335 = idf(docFreq=1183, maxDocs=44218)
               0.078125 = fieldNorm(doc=3276)
         0.04230371 = weight(abstract_txt:eine in 3276) [ClassicSimilarity], result of:
           0.04230371 = score(doc=3276,freq=1.0), product of:
             0.15518902 = queryWeight, product of:
               2.0398302 = boost
               3.4892128 = idf(docFreq=3668, maxDocs=44218)
               0.021804169 = queryNorm
             0.27259475 = fieldWeight in 3276, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               3.4892128 = idf(docFreq=3668, maxDocs=44218)
               0.078125 = fieldNorm(doc=3276)
         0.26694694 = weight(abstract_txt:google in 3276) [ClassicSimilarity], result of:
           0.26694694 = score(doc=3276,freq=3.0), product of:
             0.36743873 = queryWeight, product of:
               3.1387446 = boost
               5.3689504 = idf(docFreq=559, maxDocs=44218)
               0.021804169 = queryNorm
             0.72650737 = fieldWeight in 3276, product of:
               1.7320508 = tf(freq=3.0), with freq of:
                 3.0 = termFreq=3.0
               5.3689504 = idf(docFreq=559, maxDocs=44218)
               0.078125 = fieldNorm(doc=3276)
       0.32 = coord(8/25)