document/current/en/features/shadow/index.xml

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    <title>Shadow on ShardingSphere</title>
    <link>https://shardingsphere.apache.org/document/current/en/features/shadow/</link>
    <description>Recent content in Shadow on ShardingSphere</description>
    <generator>Hugo -- gohugo.io</generator>
    <language>en-us</language>
    
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      <title>Core Concept</title>
      <link>https://shardingsphere.apache.org/document/current/en/features/shadow/concept/</link>
      <pubDate>Mon, 01 Jan 0001 00:00:00 +0000</pubDate>
      
      <guid>https://shardingsphere.apache.org/document/current/en/features/shadow/concept/</guid>
      <description>Production Database Database for production data
Shadow Database The Database for stress test data isolation. Configurations should be the same as the Production Database.
Shadow Algorithm Shadow Algorithm, which is closely related to business operations, currently has 2 types.
 Column based shadow algorithm Routing to shadow database by recognizing data from SQL. Suitable for stress test scenario that has an emphasis on data list. Hint based shadow algorithm Routing to shadow database by recognizing comments from SQL.</description>
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    <item>
      <title>Limitations</title>
      <link>https://shardingsphere.apache.org/document/current/en/features/shadow/limitations/</link>
      <pubDate>Mon, 01 Jan 0001 00:00:00 +0000</pubDate>
      
      <guid>https://shardingsphere.apache.org/document/current/en/features/shadow/limitations/</guid>
      <description>Hint based shadow algorithm No
Column based shadow algorithm Does not support DDL.
Does not support scope, group, subqueries such as BETWEEN, GROUP BY &amp;hellip; HAVING, etc.
SQL support list
 INSERT     SQL support or not     INSERT INTO table (column,&amp;hellip;) VALUES (value,&amp;hellip;) support   INSERT INTO table (column,&amp;hellip;) VALUES (value,&amp;hellip;),(value,&amp;hellip;),&amp;hellip; support   INSERT INTO table (column,&amp;hellip;) SELECT column1 from table1 where column1 = value1 do not support     SELECT/UPDATE/DELETE     condition categories SQL support or not     = SELECT/UPDATE/DELETE &amp;hellip; WHERE column = value support   LIKE/NOT LIKE SELECT/UPDATE/DELETE &amp;hellip; WHERE column LIKE/NOT LIKE value support   IN/NOT IN SELECT/UPDATE/DELETE &amp;hellip; WHERE column IN/NOT IN (value1,value2,&amp;hellip;) support   BETWEEN SELECT/UPDATE/DELETE &amp;hellip; WHERE column BETWEEN value1 AND value2 do not support   GROUP BY &amp;hellip; HAVING&amp;hellip; SELECT/UPDATE/DELETE &amp;hellip; WHERE &amp;hellip; GROUP BY column HAVING column &amp;gt; value do not support   Sub Query SELECT/UPDATE/DELETE &amp;hellip; WHERE column = (SELECT column FROM table WHERE column = value) do not support    </description>
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