MySQL :: Externally Stored Fields in InnoDB

This article discusses the storage (inline and external) of field data in the InnoDB storage engine. All fields of variable length types like VARCHAR, VARBINARY, BLOB and TEXT can be stored inline within the clustered index record, or stored externally in separate BLOB pages outside of the index record (but within the same tablespace). All of these fields can be classified as large objects. These

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InnoDB で TEXT とかが外部に保存されるケースとクラスタインデックスに保存されるケースについての解説（レコードのサイズ次第）