mysql - Confusion about varchar datatype -

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my server has sql version of 5.0.91-community, have store long string of approx 500 character more or less, thought of going text data type told me slows performance, wanted know more varchar , it's limit.

i used think varchar limited 255 characters, read somewhere capable of storing more in newer version i.e >= 5.0.3 , using 5.0.91 think should use? if use varchar(1000) still valid?

thank you.

the documentation here,

  • varchar has max size of 65,535 in mysql 5.0.3 , later , before 5.0.3 limit 255

note effective size less,

the effective maximum length of varchar in mysql 5.0.3 , later subject maximum row size (65,535 bytes, shared among columns) , character set used.

you have specify max size, e.g. varchar(1000). stating varchar isn't enough.


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