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text type size - row limit


ricmetal
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so, they say data type TEXT can have up to 65k bytes. they also say the row limit is 65k. i read something along the lines that TEXT data type only takes up 8 or 9 bytes. is it empty? is the TEXT data type data being stored somewhere else other than in the row? please explain.

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11.6. Data Type Storage Requirements

 

The internal representation of a table has a maximum row size of 65,535 bytes, even if the storage engine is capable of supporting larger rows. This figure excludes BLOB or TEXT columns, which contribute only 9 to 12 bytes toward this size. For BLOB and TEXT data, the information is stored internally in a different area of memory than the row buffer.

Emphasis added

 

As for what is stored in the row buffer (the 9-12 bytes) I do not know exactly, but it likely is some value used to reference where the real value is stored at.

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