Hi All I want to store document uploaded by the user in the relational data

You need to make sure you store it in a CLOB. Text fields (VARCHAR or VARCHAR2) have a max limit of 4000 char and even a small file can easily be more than 4000 char long when converted to base64.
Also, take into account the additional overhead on the network to store/fetch such data. If your table is mapped to a CDT, this would have some impact - So the way you design the CDT should be modified to exclude this column (etc)

You need to make sure you store it in a CLOB. Text fields (VARCHAR or VARCHAR2) have a max limit of 4000 char and even a small file can easily be more than 4000 char long when converted to base64.
Also, take into account the additional overhead on the network to store/fetch such data. If your table is mapped to a CDT, this would have some impact - So the way you design the CDT should be modified to exclude this column (etc)