During table migration of tables from one tablespace to another, does it needs free space to do the alter table move? During migration of tables from one tablespace to another (all datafiles in the same disk/partition/mount), does it needs free space to do the alter table move?

exemple:. I have 30gb of free space on that disk, table of 1TB in tablespace_1, i wanna move the table using alter table move to tablespace_2.. can i do it or do i need to have more space available? if so, how much free space available?

Thx a lot :)
Table move copies the whole table into a new segment, then drops the old segment. This means you need enough space to store the old segment and the new segment at the same time. For a 1 TB table full of data, you need another 1 TB free space for the move to succeed.