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en/_posts/2016-09-29-mroonga-6.09.md

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+---
+layout: post.en
+title: Mroonga 6.09 has been released!
+description: Mroonga 6.09 has been released!
+---
+
+## Mroonga 6.09 has been released!
+
+Mroonga is a MySQL storage engine that supports fast fulltext search
+and geolocation search. It is CJK ready. It uses Groonga as a storage
+and fulltext search engine.
+
+[Mroonga 6.09](/docs/news.html#release-6-09) has been released!
+
+  * How to install: [Install](/docs/install.html)
+  * How to upgrade: [Upgrade guide](/docs/upgrade.html)
+
+### Changes
+
+Here is the topic in this release.
+
+  * Supported nonexistent reference insert check for FOREIGN KEY
+
+#### Supported nonexistent reference insert check for FOREIGN KEY
+
+In the previous versions, there is no support about reference insert check for FOREIGN KEY.
+
+    create table HOGES( 
+      ID         INT PRIMARY KEY AUTO_INCREMENT,
+      HOGE       VARCHAR(255)
+    ) ENGINE=Mroonga;
+    create table FOODS( 
+      ID         INT PRIMARY KEY AUTO_INCREMENT,
+      HOGE_ID    INT(10),
+      FOO        VARCHAR(255),
+      foreign key(HOGE_ID) references HOGES(ID)
+    ) ENGINE=Mroonga ;
+
+so, invalid data was inserted without error if you use above schema.
+
+Note that FOREIGN KEY check doesn't work for old version of MySQL and folks such as MySQL 5.5 or MariaDB 5.5, and FOREIGN KEY check for INSERT/DELETE is not supported yet. (it will be supported in the future release!)
+
+### Conclusion
+
+Please refer to [Release 6.09 - 2016-09-29](/docs/news.html#release-6-09-2016-09-29) about detailed changes since 6.08.
+
+Let's go all out to search by Mroonga!