Oracle 11g database Connection & Response are very slow

I have an ORACLE 11g R2 on lRed Hat Enterprise Linux Server release 5.3 (Tikanga).
initially it was working fine.
Now a days while attempting to connect into the database from network using @service_name
it takes a lot of time to establish the connection and even it gets connected the query response time is very high.
on the other hand if I connect from the native database machine's terminal without @service_name it works fine & the response time is convincing. But even from the native database machine's terminal with @service_name it is giving me the same pain.
can any body help me how to fix this.
Thanks in advance..
Arkesh

thanks for the reply & Query
Alert Log entry do look like this
ORACLE_BASE from environment = /u01/app/oracle
Thu Apr 22 07:29:10 2010
ALTER DATABASE MOUNT
Successful mount of redo thread 1, with mount id 4283520006
Database mounted in Exclusive Mode
Lost write protection disabled
Completed: ALTER DATABASE MOUNT
Thu Apr 22 07:29:15 2010
ALTER DATABASE OPEN
Beginning crash recovery of 1 threads
parallel recovery started with 7 processes
Started redo scan
Completed redo scan
read 15 KB redo, 23 data blocks need recovery
Started redo application at
Thread 1: logseq 449, block 8217
Recovery of Online Redo Log: Thread 1 Group 2 Seq 449 Reading mem 0
Mem# 0: /u01/app/oracle/oradata/ultimus/redo02.log
Completed redo application of 0.01MB
Completed crash recovery at
Thread 1: logseq 449, block 8248, scn 10502937
23 data blocks read, 23 data blocks written, 15 redo k-bytes read
Thread 1 advanced to log sequence 450 (thread open)
Thread 1 opened at log sequence 450
Current log# 3 seq# 450 mem# 0: /u01/app/oracle/oradata/ultimus/redo03.log
Successful open of redo thread 1
MTTR advisory is disabled because FAST_START_MTTR_TARGET is not set
SMON: enabling cache recovery
Successfully onlined Undo Tablespace 2.
Verifying file header compatibility for 11g tablespace encryption..
Verifying 11g file header compatibility for tablespace encryption completed
SMON: enabling tx recovery
Database Characterset is WE8MSWIN1252
No Resource Manager plan active
replication_dependency_tracking turned off (no async multimaster replication found)
Starting background process QMNC
Thu Apr 22 07:29:18 2010
QMNC started with pid=27, OS id=3611
Completed: ALTER DATABASE OPEN
Thu Apr 22 07:29:20 2010
db_recovery_file_dest_size of 10240 MB is 0.00% used. This is a
user-specified limit on the amount of space that will be used by this
database for recovery-related files, and does not reflect the amount of
space available in the underlying filesystem or ASM diskgroup.
Thu Apr 22 07:29:20 2010
Starting background process CJQ0
Thu Apr 22 07:29:20 2010
CJQ0 started with pid=28, OS id=3817
Thu Apr 22 07:34:18 2010
Starting background process SMCO
Thu Apr 22 07:34:18 2010
SMCO started with pid=19, OS id=3861
Thu Apr 22 07:59:23 2010
Thread 1 advanced to log sequence 451 (LGWR switch)
Current log# 1 seq# 451 mem# 0: /u01/app/oracle/oradata/ultimus/redo01.log
Thu Apr 22 10:09:23 2010
DM00 started with pid=34, OS id=6272, job ULTIMUS.SYS_EXPORT_SCHEMA_01
Thu Apr 22 10:09:25 2010
DW00 started with pid=35, OS id=6274, wid=1, job ULTIMUS.SYS_EXPORT_SCHEMA_01
Thu Apr 22 10:11:20 2010
Thread 1 cannot allocate new log, sequence 452
Private strand flush not complete
Current log# 1 seq# 451 mem# 0: /u01/app/oracle/oradata/ultimus/redo01.log
Thread 1 advanced to log sequence 452 (LGWR switch)
Current log# 2 seq# 452 mem# 0: /u01/app/oracle/oradata/ultimus/redo02.log
Thu Apr 22 10:13:28 2010
DM00 started with pid=45, OS id=6395, job ULTIMUSISL.SYS_EXPORT_SCHEMA_01
Thu Apr 22 10:13:29 2010
DW00 started with pid=46, OS id=6397, wid=1, job ULTIMUSISL.SYS_EXPORT_SCHEMA_01
Thu Apr 22 10:14:29 2010
Thread 1 cannot allocate new log, sequence 453
Private strand flush not complete
Current log# 2 seq# 452 mem# 0: /u01/app/oracle/oradata/ultimus/redo02.log
Thread 1 advanced to log sequence 453 (LGWR switch)
Current log# 3 seq# 453 mem# 0: /u01/app/oracle/oradata/ultimus/redo03.log
Thu Apr 22 10:15:40 2010
DM00 started with pid=43, OS id=6432, job IULTIMUS.SYS_EXPORT_SCHEMA_01
Thu Apr 22 10:15:41 2010
DW00 started with pid=45, OS id=6434, wid=1, job IULTIMUS.SYS_EXPORT_SCHEMA_01
Thu Apr 22 10:16:38 2010
DM00 started with pid=45, OS id=6450, job ULTIMUSEXT.SYS_EXPORT_SCHEMA_01
Thu Apr 22 10:16:38 2010
DW00 started with pid=46, OS id=6452, wid=1, job ULTIMUSEXT.SYS_EXPORT_SCHEMA_01
Thu Apr 22 10:26:18 2010
Fatal NI connect error 12537, connecting to:
(LOCAL=NO)
VERSION INFORMATION:
     TNS for Linux: Version 11.2.0.1.0 - Production
     Oracle Bequeath NT Protocol Adapter for Linux: Version 11.2.0.1.0 - Production
     TCP/IP NT Protocol Adapter for Linux: Version 11.2.0.1.0 - Production
Time: 22-APR-2010 10:26:18
Tracing not turned on.
Tns error struct:
ns main err code: 12537
TNS-12537: TNS:connection closed
ns secondary err code: 12560
nt main err code: 0
nt secondary err code: 0
nt OS err code: 0
opiodr aborting process unknown ospid (6587) as a result of ORA-609

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