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了解MySQL联表查询中的驱动表，优化查询，以小表驱动大表

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<div class="htmledit_views"> 一、为什么要用小表驱动大表 1、驱动表的定义 当进行多表连接查询时， [驱动表] 的定义为： 1）指定了联接条件时，满足查询条件的记录行数少的表为[驱动表] <p style="margin-top:0px;margin-bottom:0px;padding-top:0px;padding-bottom:0px;border:0px;

mysql驱动表与被驱动表及join优化

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驱动表与被驱动表先了解在join连接时哪个表是驱动表，哪个表是被驱动表： 1.当使用 left join 时，左表是驱动表，右表是被驱动表 2.当使用 right join 时，右表时驱动表，左表是驱动表 3.当使用 join时，mysql会选择数据量比较小的表作为驱动表，大表作为被驱动表 join查询如何选择驱动表与被驱动表　　在sql优化中，永远是以小表驱动大表。例如: A是小表，B是大表　　使用left join 时，则应该这样写select * from A a left join B b on a.code=b.code 　　A表时驱动表，B表是被驱动表测试：A表140多条数据，B表20万左右的数据量　　select * from A a left join B b on a.code=b.code 　　执行时间：7.5s 　　select * from B b left join A a on a.code=b.code 　　执行时间：19s 结论：小表驱动大表优于大表驱动小表 join查询在有索引条件下　　驱动表有索引不会使用到索引　　被驱动表建立索引会使用到索引在以小表驱动大表的情况下，再给大表建立索引会大大提高执行速度测试：给A表，B表建立索引分析：EXPLAIN select * from A a left join B b on

ES Client

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关于 ElasticSearch的学习参见： ELK | wjcx_sqh 本文分别学习 .Net | Java 下操作 ES： .Net 目前主流的 .Net 客户端有 2 种： PlainElastic.Net Elasticsearch.Net.dll 和 Nest.dll PlainElastic.Net 简单了解即可，具体参见： https://www.cnblogs.com/eggTwo/p/4039779.html ##Elasticsearch.Net + Nest 直接在 Nuget | 官网下载对应的 .nuget包，在项目中引入即可。 Elasticsearch.Net 6.8.0 NEST 6.8.0 注意不同版本 .dll 对 .Net Framework 框架的依赖。 ###索引创建连接和索引 var nodes = new Uri[] { new Uri(""), new Uri("") }; var pool = new StaticConnectionPool(nodes); var settings = new ConnectionSettings(pool); var ESClient = new ElasticClient(settings); if (!client.TypeExists(_indexName, _typeName)

Multimatch query with Fuzzy NEST - ElasticSearch

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问题 I wrote the following query to check multiple fields from a value and it's work: var searchResponse = client.Search<Document>(s => s .Query(q => q .MultiMatch(a => a .Fields(f => f .Field(p => p.Attachment.Content) .Field(p => p.FileName)) .Query(queryValue)))); I would achieve the same result (search the queryValue in fields Attachment.Content and FileName) but with the Fuzzy mechanism (for example, if queryValue is "esting" I would get back also a result with filename "testing"). Thanks a

Token Chars Mapping to Ngram Filter ElasticSearch NEST

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问题 I'm trying to replicate the below mappings using NEST and facing an issue while mapping the token chars to the tokenizer. { "settings": { "analysis": { "filter": { "nGram_filter": { "type": "nGram", "min_gram": 2, "max_gram": 20, "token_chars": [ "letter", "digit", "punctuation", "symbol" ] } }, "analyzer": { "nGram_analyzer": { "type": "custom", "tokenizer": "whitespace", "filter": [ "lowercase", "asciifolding", "nGram_filter" ] } } } } I was able to replicate everything except the token

Complex nested Elastic NEST Query

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问题 How would I convert this to the equivalent Nest query? { "query": { "nested": { "path": "boundedContexts", "query": { "nested": { "path": "boundedContexts.aggregateRoots", "query": { "nested": { "path": "boundedContexts.aggregateRoots.modelMetaData", "query": { "bool": { "must": [ { "match": { "boundedContexts.aggregateRoots.modelMetaData.modelReferenceId": "4e7c5c0e-93a7-4bf6-9705-cf1327760e21" } }, { "match": { "boundedContexts.aggregateRoots.modelMetaData.modelType.name": "AggregateRoot" }

How to index (ingest) geo data (Geometry, GeometryCollection) as GeoShape in ElasticSearch with C#, Nest, NetTopologySuite from GeoJson file / string?

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问题 Summary I want to to properly index (ingest) geo data (Geometry, GeometryCollection) as GeoShape in ElasticSearch using C#, Nest and NetTopologySuite (NTS) from GeoJson files or string representations. I'm using the following stack: ElasticSearch 7.10.1 NEST 7.10.1 NetTopologySuite 2.1.0 NetTopologySuite.IO.GeoJSON 2.0.4 In my GitHub GIST you can find the two sample files (postal-area.geojson and the geojson file as a sample for Scenario #7) along with the code presented bellow with what i've

Complex Nested Query Where to Place Bool Match

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问题 I have a complex index within Elastic that I need to query by 3 parameters. Thanks to this answered question I am able to query by 2 of the 3 parameters, however the 3rd parameter is not at the same nested level as the other two. The schema looks this.. The following query works for the 2 of the 3 parameters... But the 3rd parameter is at a different level the the other two so this query does not return the expected document. Given that the bool match query for "boundedContexts.aggregateRoot

Search by multiple values using NEST(ElasticSearch)

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问题 I have an index called " campaigns " with these records: "hits" : [ { "_index" : "campaigns", "_id" : "cf08b05c-c8b5-45cb-bca8-17267c3613fb", "_source" : { "PublisherId" : 1, "CurrentStatus" : "Pending" } }, { "_index" : "campaigns", "_id" : "39436cb3-483e-4fb4-92e4-4e06ecad27a1", "_source" : { "PublisherId" : 1, "CurrentStatus" : "Approved" } }, { "_index" : "campaigns", "_id" : "21436cb1-583e-4fb4-92e4-4e06ecad23a2", "_source" : { "PublisherId" : 1, "CurrentStatus" : "Rejected" } } ] I want

NEST (ElasticSearch) matching Highlights to documents

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问题 I'm using C# NEST with ElasticSearch. I'm able to query an index of Products and look in their Name and CategoryName fields for matches. I can also extend the query using Highlights . Now in my IQueryResponse response I have two collections: (1) .Documents and (2) .Highlights . e.g.: Consider the search for: "cat" which has 3 document results: { { Name: "Cat product", CategoryName: "Category1" }, { Name: "Some product", CategoryName: "Category2" }, { Name: "Some product2", CategoryName: