Resize bigfile tablespace

Hello,

Oracle 11.2, SE, no patches.

My bigfile TBS has about 2% of free space in TBS:

Tablespace        Tbsp %                                                               Allocated    Current    Current File %

Name                Free Filename                                                             GB    Used GB    Free GB   Free

----------------- ------ ------------------------------------------------------------ ---------- ---------- ---------- ------

big_data     2.6 /opt/app/oracle/oradata/big_data.dbf                   1,320.000  1,285.687     34.313    2.6

I want to expand it for another 100G:

alter tablespace big_data resize 1420G;

Database is quite heavily used and during resizing there will be impact as data file has to be locked. Any idea which impact can I expect ? Would be better if application will be stopped before ?

There is autoextend defined but I think it is better to have it under control and trigger in the time when db usage is not high.