TRUNCATE TABLE times wrong: Ora-00054:resource busy and acquire with nowait specified

This is because the table with the truncate operation is still executing, and no commit is finished, at which point you can query V$locked_object to get which user's transaction is operating this table.

Experimental Simulation
First, use the Scott user to enter the database and do the following for the existing table T1:
sql> Delete from T1 where name like '%c% ';
23308 rows deleted.
Note that a commit was not executed here.
Then, in another session, the database is performed as a DBA, operating:
sql> truncate TABLE scott.t1;
TRUNCATE TABLE Scott.t1
*
ERROR at line 1:
Ora-00054:resource busy and acquire with nowait specified
The fault reappeared.
For such a problem, the following actions are done using DBA identity:
First determine the object_id of the Action object:
Sql> Select object_id from dba_objects where object_name= ' T1 ';
object_id
----------
52505
Sql> Select Object_id,session_id,oracle_username,os_user_name,process,locked_mode from V$locked_object where object_id=52505;
object_id session_id oracle_username os_user_name PROCESS Locked_mode
--------- ---------- ---------------- ------------- -------- -----------
52505 149 SCOTT Oracle 5333 3
Visible from above, it is the user Scott, who is Sid 149, who is working on this table and can get more information by querying V$session:
Sql> Select sid,serial#,username,process from v$session where sid=149;
SID serial# USERNAME PROCESS
--------- ---------- -------------- ------------
149 136 SCOTT 5333
Then, if the operation allows, you can kill the transaction:
Sql> alter system kill session ' 149,136 ';
You can then perform the truncate operation.

Note:Simply integrate the above statement into the following
Select Sid,serial#,username,process from V$session where sid= (select session_id from v$locked_object where object_id= (SE Lect object_id from dba_objects where object_name= ' &table_name '));