Database hanging on connect

Question

Hello,
I have the problem that login attempt statement of the form:
connect user/password
is hanging.
I can connect via sys and system with no problems. I can select from any user's tables also OK. I can execute ALTER SESSION SET CURRENT_SCHEMA = user.
The database is running in archivelog mode. And this happened after the UNIX server was restarted.
Please, help how to diagnose what is going on, and most surprisingly why ??
Thanks in advance
Evgeni

Answer 1

Yes, I have checked that:
Since I have set log_archive_dest_10 = location=USE_DB_RECOVERY_FILE_DEST
I'm using the FRA for archived log keeping. And it is currently OK.
select * from v$flash_recovery_area_usage;
name space_limit space_used
/oralog     53687091200     15467437056     0     255
And no errors exist in the alert.log file.
BUT in the aler.log now I notice such messages that I have never seen before:
Fri Jul 20 12:13:54 2007
ALTER SYSTEM SET resource_manager_plan='INTERNAL_PLAN' SCOPE=BOTH;
Fri Jul 20 12:14:01 2007
ALTER SYSTEM SET resource_manager_plan='INTERNAL_QUIESCE' SCOPE=BOTH;
Fri Jul 20 12:17:13 2007
ALTER SYSTEM SET resource_manager_plan='SYSTEM_PLAN' SCOPE=BOTH;
Fri Jul 20 12:17:13 2007
ALTER SYSTEM SET resource_manager_plan='SYSTEM_PLAN' SCOPE=BOTH;
Fri Jul 20 12:17:24 2007
ALTER SYSTEM SET resource_manager_plan='INTERNAL_QUIESCE' SCOPE=BOTH;
Fri Jul 20 12:17:37 2007
ALTER SYSTEM SET resource_manager_plan='SYSTEM_PLAN' SCOPE=BOTH;
Fri Jul 20 12:17:43 2007
ALTER SYSTEM SET resource_manager_plan='INTERNAL_QUIESCE' SCOPE=BOTH;
Fri Jul 20 12:17:47 2007
Me, manually did not change the resource_manager_plan parameter.
Anyway, can this be the reason for not being able to connect by any users except sys/system?
regards,
Evgeni