On 14.02.2011 14:06, dba wrote:
> I have two identical tables. But the with of the fields are different. Need
> to know whether changing from varchar(100) to varchar(30) will increase the
> performance, or its just the memory access.
It will make no difference. The max length is just a constraint on what
values can be stored, it doesn't affect how the strings are stored. In
both cases, the strings are stored in a variable-length format.
--
Heikki Linnakangas
EnterpriseDB http://www.enterprisedb.com
