Metadata description/keywords: larger maxlength values required

"Nicolas Pottrain" <[email protected]>
Newsgroups gmane.comp.cms.jahia.devel
Message-ID <9F2A9B093E7F2C44BDD20715856A4E7D23F029@res-ref-wmx.thereferencegroup.be>
Hello,
 
I would like to change the maxlength of the metadata description and
keywords field from 250 to 500.
How should I do that?
Any pitfalls?(for ex. value to large for database)
 
thx,
 
Nicolas
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