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1. Top results related to when to use wikidata's elasticsearch index 0

   • when to use multilevel index

     Top Answer

     Answered May 07, 2013 · 1 votes

     First a slight terminological clarification...

     Primary index is simply an index under a primary key. Secondary index is any other index. So this is orthogonal to "simple" vs. "composite" (aka. "compound" or what you call "multilevel") index: primary index may or may not be composite and secondary index may or may not be composite.

     To answer your question...

     Depends on the database structure (PKs, FKs and clustering) and queries you intend to run.

     For example, the database structure might imply:

     • There will likely be a composite index on Course_module {course_code, module_code}, to support its PK.
     • There will likely be an index on Course_module {module_code} to support the FK.
     • If you wish to cluster (aka. "index-organize") the courses based on course_leader, there will be a clustering index on {course_leader}1.
     • Etc, etc...

     The querying needs might imply:

     • If you wish to find a course with given course_name, only and index on {course_name} is needed (for good performance).
     • If you wish to find a course with given course_name and course_leader a composite index on {course_name, course_leader} is needed.
     • If you wish to get courses that belong to the given course_leader you'll need an index on {course_leader}, but if your SELECT list contains only course_name, you might consider covering the query with the composite index {course_leader, course_name}.
     • Etc, etc...

     Each additional index lowers the performance of INSERT/UPDATE/DELETE so the index design is a balancing act between read and write performance.

     All this stems from the structure of B-Trees and how they are used to satisfy various database operations. The complete treatment of this subject is really beyond the scope of any single StackOverflow answer, but if you are interested, i warmly recommend reading from start to finish: Use The Index, Luke!

     1 Some DBMSes don't support clustering at all, and most of those that do require the clustering key to equal the PK. MS SQL Server is a notable exception - you can cluster the data on a key different from PK.

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     1/5

   • When to use system.exit(0)?

     Top Answer

     Answered Feb 09, 2018 · 1 votes

     System.exit will ask the VM process to stop, and the code returned will be the code given in parameter. Common codes are: 0 for success, 1 to 127 for error, 128-255 is used by Unix and mapped to signals.

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     2/5

   • Elasticsearch does not work when try to use with python

     Top Answer

     Answered Nov 03, 2022 · 1 votes

     take a look at the docs, basically you need to use the below if you want to connect to Elasticsearch locally;

     client = Elasticsearch("http://localhost:9200")indexName = "art"client.indices.create(index=indexName)-

     • client tells where this instance needs to connect to to talk to Elasticsearch
     • indexName is the name of the index you want to use
     • the last line is the action, what you want to do, ie create the index you defined

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     3/5

   • when to use index.php instead of index.html

     Top Answer

     Answered Jan 08, 2013 · 58 votes

     You will have to choose the PHP extension (.php) when you want php code to be executed in the file. PHP code is code between the opening <?php or <? and the closing ?> tags.

     When no PHP code should be executed you can use the .html extension.

     Usually when using the .php extension you are telling the web server, that it should use a php interpreter to process the file before it will be delivered to the browser. The php interpreter will then replace all content between the <?php and ?> by the output of the PHP code. Just as if you wrote it manually. The processed file will then be delivered to the browser.

     However, using the .php extension to tell the web server to process php code is configurable. If you want you can use other file extensions too.

     There is another thing that should be pointed out. When you only type the url path (without a filename) like :

     http://www.myserver.com/-

     there is an order of extensions (filenames) which the webserver (apache) searches for an index document. For example an apache config may contain a section like:

     <IfModule mod_dir.c> DirectoryIndex index.html index.cgi index.pl index.php index.xhtml index.htm</IfModule>

     Meaning that the index document is searched in the order above. This means if you place an index.html and a index.php in the same folder - and having the configuration above - always the index.html would be delivered by the server.

     Other Answers

     Answered Nov 17, 2015 · 9 votes

     It will not hurt a website if you serve every page as .php. Apache is very fast to serve any php, let alone one which contains only static html.

     As a beginner you may find php will benefit you, by allowing you to creating simple templates. Site header and footer includes for instance could be written in one file, then included in all the other pages.

     Other Answers

     Answered Jan 08, 2013 · 8 votes

     Its not a big deal whether you use index.php or index.html. You ca use anyone of either. Only thing is you need PHP(or any other server side scripting language) to make your site dynamic.

     Like you have a login page,you can surely make it as inde.html but your logics would either have to be in a different file or embedded in HTMl.

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     4/5

   • When to use composite index and covering index in SQL Server?

     Top Answer

     Answered Dec 15, 2014 · 6 votes

     • The composite index (where all of the columns are “key” columns) will carry the data in all levels of the index; the INCLUDE index will only carry the “non key” columns in the leaf node. Take away: The INCLUDE index will be smaller than the equivalent composite index.
     • The INCLUDE columns(non-key) will not count towards the max index size (900 bytes).
     • Updates to non-key columns in INCLUDE indexes will not contribute to index fragmentation; updates to unused “key” columns in the composite index will result in fragmentation… IMO, this is a biggie.
     • Assuming low index fragmentation, both composite and INCLUDE indexes will perform comparably. All columns in the composite index need not be in the query predicate.

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     5/5

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2. stackoverflow.com › questions › 78968821Elasticsearch Devtools Queries (Regexp/Wildcard) - Not Working

   stackoverflow.com › questions › 78968821

   1 day ago · 0. I'm tring to create a regexp query in elasticsearch devtools and it appears not to be working. I was following the docs on the website: Elasticsearch Regexp. Elasticsearch Wildcard. I've tried all of the above but for some reason it appears like either i'm doing something wrong (obviously because the data exists but not returned) or the data ...

3. www.linkedin.com › pulse › elastics-return-openElastic’s Return to Open Source: A New Chapter for ...

   www.linkedin.com › pulse › elastics-return-open

   4 days ago · Elasticsearch is a powerful open-source, distributed search and analytics engine that allows users to index and search large volumes of data in real-time.

4. www.youtube.com › watchElasticsearch Ingest Data Tutorial | Day 10 - YouTube

   www.youtube.com › watch

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   2 days ago · Welcome to Day 10 of the 30-Day MyDFIR SOC Analyst Challenge! This challenge is designed to help aspiring SOC Analysts like you gain hands-on practical exper...

5. wikitech.wikimedia.org › wiki › Search_PlatformSearch Platform/Weekly Updates/2024-09-06 - Wikitech

   wikitech.wikimedia.org › wiki › Search_Platform

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   5 days ago · The code ships now, but it will be 16 weeks before all of wikidata is rerendered with the additional properties. This does not change the `haswbstatement:P<n>=<value>` support, those are still limited.

6. zarax.co.uk › business-and-economics › managementWhat is Elastic Site Search? - Zarax

   zarax.co.uk › business-and-economics › management

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   2 days ago · Enter Elastic Site Search, a sophisticated solution that leverages the capabilities of Elasticsearch, a robust open-source search engine built atop Apache Lucene. This technology enables websites to offer enhanced searching experiences, allowing users to find what they need swiftly and accurately.

7. yandex.cloud › opensearch-index-policyConfiguring an index policy in Yandex Managed Service for ...

   yandex.cloud › opensearch-index-policy

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   2 days ago · You can use policies to automate certain operations on indexes. For example, to make your data more secure and available, you can set up a policy that will create a new index if at least one of these conditions is met: Index is over 50 GB in size. Index is over 30 days old. To configure such a policy: Create a policy. Attach the policy to an index.

8. discuss.elastic.co › t › why-is-the-non-existentWhy is the non-existent `elasticsearch.url` mentioned in ...

   discuss.elastic.co › t › why-is-the-non-existent

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   5 days ago · Start the Kibana container with the following command: docker run -p 127.0.0.1:5601:5601 -d --name kibana --network elastic-net \ -e ELASTICSEARCH_URL=http://elasticsearch:9200 \ -e ELASTICSEARCH_HOSTS=http://elasticsearch:9200 \ -e ELASTICSEARCH_USERNAME=kibana_system \ -e ELASTICSEARCH_PASSW...