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Part 2: The 32-Bit/64-Bit Drivers : The PostgreSQL Wire Protocol Driver : Connection Option Descriptions : Max Varchar Size
  
Max Varchar Size
Attribute
MaxVarcharSize (MVS)
Purpose
Specifies the maximum size of columns of type SQL_VARCHAR that the driver describes through result set descriptions and catalog functions.
Valid Values
A positive integer from 1 to x
where:
x
is maximum size of the SQL_VARCHAR data type.
Default
None. The actual size of the columns from the database is persisted to the application.
GUI Tab
Advanced