Overview

Project website postgis.net/workshops/postgis-intro
Project maintainers User avatar jsanz User avatar komzpa User avatar dmateos User avatar yellow73 User avatar dkastl User avatar cvvergara User avatar andischi User avatar astrid_emde User avatar jef
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Source code repository https://github.com/postgis/postgis-workshops.git
Repository branch master
Last remote commit Merge pull request #120 from osgeoweblate/weblate-postgis-workshop-index 75182f2
Regina Obe authored 3 weeks ago
Last commit in Weblate Translated using Weblate (Chinese (Simplified)) d414515
Zuochenwei authored a month ago
Weblate repository https://weblate.osgeo.org/git/postgis-workshop/index/
File mask postgis-intro/sources/locale/*/LC_MESSAGES/clusterindex.po
Translation file Download postgis-intro/sources/locale/zh_Hans/LC_MESSAGES/clusterindex.po
Last change Jan. 8, 2023, 2:50 a.m.
Last author None
2 weeks ago

String statistics

Strings percent Hosted strings Words percent Hosted words Characters percent Hosted characters
Total 21 583 3,503
Translated 4% 1 1% 2 1% 13
Needs editing 0% 0 0% 0 0% 0
Read-only 0% 0 0% 0 0% 0
Failing checks 4% 1 1% 2 1% 13
Strings with suggestions 0% 0 0% 0 0% 0
Untranslated strings 95% 20 99% 581 99% 3,490
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Resource updated

  1. postgis-workshop
  2. clusterindex
  3. Chinese (Simplified)
The "postgis-intro/sources/locale/zh_Hans/LC_MESSAGES/clusterindex.po" file was changed. a year ago
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Resource updated

  1. postgis-workshop
  2. clusterindex
  3. Chinese (Simplified)
The "postgis-intro/sources/locale/zh_Hans/LC_MESSAGES/clusterindex.po" file was changed. a year ago
User avatar None

Resource updated

  1. postgis-workshop
  2. clusterindex
  3. Chinese (Simplified)
The "postgis-intro/sources/locale/zh_Hans/LC_MESSAGES/clusterindex.po" file was changed. 2 years ago
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String updated in the repository

  1. postgis-workshop
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  3. Chinese (Simplified)
`CLUSTER <https://www.postgresql.org/docs/current/sql-cluster.html>`_: Re-orders the data in a table to match the ordering in the index.
 
2 years ago
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String updated in the repository

  1. postgis-workshop
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The difference between "no index" and "index" is generally huge and highly measurable. The difference between "mediocre index" and "great index" usually takes quite careful measurement to discern, and can be very sensitive to the workload being tested.
 
2 years ago
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String updated in the repository

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In theory, yes. In practice, no really. As long as the index is a "pretty good" spatial decomposition of the data, the main determinant of performance will be the order of the actual table tuples.
 
2 years ago
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Does Index Structure Matter?
 
2 years ago
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String updated in the repository

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System RAM is not the fastest memory on a modern computer. There are several levels of cache between system RAM and the actual CPU, and the underlying operating system and processor will move data up and down the cache heirarchy in blocks. If the block getting moved up happens to include the piece of data the system will need next... that's a big win. Correlating the memory structure with the spatial structure is a way in increase the odds of that win happening.
 
2 years ago
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String updated in the repository

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Surprisingly, yes. Keeping records that are "near each other" in space "near each other" in memory increases the odds that related records will move up the servers "memory cache heirarchy" together, and thus make memory accesses faster.
 
2 years ago
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String updated in the repository

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Is clustering still necessary?
 
2 years ago
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