any one can help me to check this log? I get "page not found" occasionally.thanks .

Dump file f:\oraclexe\app\oracle\admin\xe\bdump\alert_xe.log
Tue Jan 08 18:14:24 2008
ORACLE V10.2.0.1.0 - Production vsnsta=0
vsnsql=14 vsnxtr=3
Windows XP Version V5.1 Service Pack 1
CPU : 2 - type 586
Process Affinity : 0x00000000
Memory (Avail/Total): Ph:2991M/3583M, Ph+PgF:4952M/5471M, VA:1945M/2047M
Tue Jan 08 18:14:24 2008
Starting ORACLE instance (normal)
LICENSE_MAX_SESSION = 0
LICENSE_SESSIONS_WARNING = 0
Picked latch-free SCN scheme 2
Using LOG_ARCHIVE_DEST_10 parameter default value as USE_DB_RECOVERY_FILE_DEST
Autotune of undo retention is turned on.
IMODE=BR
ILAT =10
LICENSE_MAX_USERS = 0
SYS auditing is disabled
ksdpec: called for event 13740 prior to event group initialization
Starting up ORACLE RDBMS Version: 10.2.0.1.0.
System parameters with non-default values:
sessions = 49
__shared_pool_size = 222298112
__large_pool_size = 16777216
__java_pool_size = 4194304
__streams_pool_size = 0
spfile = F:\ORACLEXE\APP\ORACLE\PRODUCT\10.2.0\SERVER\DBS\SPFILEXE.ORA
sga_target = 805306368
control_files = F:\ORACLEXE\ORADATA\XE\CONTROL.DBF
__db_cache_size = 557842432
compatible = 10.2.0.1.0
db_recovery_file_dest = F:\oraclexe\app\oracle\flash_recovery_area
db_recovery_file_dest_size= 10737418240
undo_management = AUTO
undo_tablespace = UNDO
remote_login_passwordfile= EXCLUSIVE
dispatchers = (PROTOCOL=TCP) (SERVICE=XEXDB)
shared_servers = 5
job_queue_processes = 4
audit_file_dest = F:\ORACLEXE\APP\ORACLE\ADMIN\XE\ADUMP
background_dump_dest = F:\ORACLEXE\APP\ORACLE\ADMIN\XE\BDUMP
user_dump_dest = F:\ORACLEXE\APP\ORACLE\ADMIN\XE\UDUMP
core_dump_dest = F:\ORACLEXE\APP\ORACLE\ADMIN\XE\CDUMP
db_name = XE
open_cursors = 300
os_authent_prefix =
pga_aggregate_target = 268435456
PMON started with pid=2, OS id=1132
PSP0 started with pid=3, OS id=3612
MMAN started with pid=4, OS id=2392
DBW0 started with pid=5, OS id=3624
LGWR started with pid=6, OS id=1356
CKPT started with pid=7, OS id=1164
SMON started with pid=8, OS id=3832
RECO started with pid=9, OS id=2904
CJQ0 started with pid=10, OS id=2844
MMON started with pid=11, OS id=2176
Tue Jan 08 18:14:24 2008
starting up 1 dispatcher(s) for network address '(ADDRESS=(PARTIAL=YES)(PROTOCOL=TCP))'...
MMNL started with pid=12, OS id=1292
Tue Jan 08 18:14:24 2008
starting up 5 shared server(s) ...
Oracle Data Guard is not available in this edition of Oracle.
Tue Jan 08 18:14:24 2008
alter database mount exclusive
Tue Jan 08 18:14:28 2008
Setting recovery target incarnation to 2
Tue Jan 08 18:14:28 2008
Successful mount of redo thread 1, with mount id 2524594368
Tue Jan 08 18:14:28 2008
Database mounted in Exclusive Mode
Completed: alter database mount exclusive
Tue Jan 08 18:14:28 2008
alter database open
Tue Jan 08 18:14:28 2008
Beginning crash recovery of 1 threads
Tue Jan 08 18:14:28 2008
Started redo scan
Tue Jan 08 18:14:28 2008
Completed redo scan
1305 redo blocks read, 132 data blocks need recovery
Tue Jan 08 18:14:28 2008
Started redo application at
Thread 1: logseq 62, block 3
Tue Jan 08 18:14:29 2008
Recovery of Online Redo Log: Thread 1 Group 1 Seq 62 Reading mem 0
Mem# 0 errs 0: F:\ORACLEXE\APP\ORACLE\FLASH_RECOVERY_AREA\XE\ONLINELOG\O1_MF_1_3NX4T37T_.LOG
Tue Jan 08 18:14:29 2008
Completed redo application
Tue Jan 08 18:14:29 2008
Completed crash recovery at
Thread 1: logseq 62, block 1308, scn 126409946604
132 data blocks read, 132 data blocks written, 1305 redo blocks read
Tue Jan 08 18:14:30 2008
Thread 1 advanced to log sequence 63
Thread 1 opened at log sequence 63
Current log# 2 seq# 63 mem# 0: F:\ORACLEXE\APP\ORACLE\FLASH_RECOVERY_AREA\XE\ONLINELOG\O1_MF_2_3NX4T4J3_.LOG
Successful open of redo thread 1
Tue Jan 08 18:14:30 2008
SMON: enabling cache recovery
Tue Jan 08 18:14:30 2008
Successfully onlined Undo Tablespace 1.
Tue Jan 08 18:14:30 2008
SMON: enabling tx recovery
Tue Jan 08 18:14:30 2008
Database Characterset is AL32UTF8
replication_dependency_tracking turned off (no async multimaster replication found)
Starting background process QMNC
QMNC started with pid=20, OS id=524
Tue Jan 08 18:14:32 2008
Completed: alter database open
Tue Jan 08 18:14:33 2008
db_recovery_file_dest_size of 10240 MB is 0.98% 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.
Tue Jan 08 18:14:53 2008
Memory Notification: Library Cache Object loaded into SGA
Heap size 2208K exceeds notification threshold (2048K)
KGL object name :XDB.XDbD/PLZ01TcHgNAgAIIegtw==

Tue Jan 08 18:56:55 2008
Errors in file f:\oraclexe\app\oracle\admin\xe\bdump\xe_s000_3780.trc:
ORA-07445: exception encountered: core dump [ACCESS_VIOLATION] [_npierr+487] [PC:0x5F22C3] [ADDR:0x4] [UNABLE_TO_READ] []

Tue Jan 08 18:56:55 2008
Errors in file f:\oraclexe\app\oracle\admin\xe\bdump\xe_s000_3780.trc:
ORA-07445: exception encountered: core dump [ACCESS_VIOLATION] [_npierr+487] [PC:0x5F22C3] [ADDR:0x4] [UNABLE_TO_READ] []

Tue Jan 08 18:56:56 2008
Errors in file f:\oraclexe\app\oracle\admin\xe\bdump\xe_s000_3780.trc:
ORA-07445: exception encountered: core dump [ACCESS_VIOLATION] [_npierr+487] [PC:0x5F22C3] [ADDR:0x4] [UNABLE_TO_READ] []

Tue Jan 08 18:57:00 2008
Errors in file f:\oraclexe\app\oracle\admin\xe\bdump\xe_s001_3252.trc:
ORA-07445: exception encountered: core dump [ACCESS_VIOLATION] [_npierr+487] [PC:0x5F22C3] [ADDR:0x4] [UNABLE_TO_READ] []

Tue Jan 08 18:57:00 2008
found dead shared server 'S000', pid = (14, 1)
Tue Jan 08 18:57:00 2008
Errors in file f:\oraclexe\app\oracle\admin\xe\bdump\xe_s001_3252.trc:
ORA-07445: exception encountered: core dump [ACCESS_VIOLATION] [_npierr+487] [PC:0x5F22C3] [ADDR:0x4] [UNABLE_TO_READ] []

Tue Jan 08 18:57:01 2008
Errors in file f:\oraclexe\app\oracle\admin\xe\bdump\xe_s001_3252.trc:
ORA-07445: exception encountered: core dump [ACCESS_VIOLATION] [_npierr+487] [PC:0x5F22C3] [ADDR:0x4] [UNABLE_TO_READ] []

Tue Jan 08 18:58:00 2008
found dead shared server 'S001', pid = (15, 1)
Tue Jan 08 19:03:56 2008
Errors in file f:\oraclexe\app\oracle\admin\xe\bdump\xe_s000_1816.trc:
ORA-07445: exception encountered: core dump [ACCESS_VIOLATION] [_npierr+487] [PC:0x5F22C3] [ADDR:0x4] [UNABLE_TO_READ] []

Tue Jan 08 19:03:57 2008
Errors in file f:\oraclexe\app\oracle\admin\xe\bdump\xe_s000_1816.trc:
ORA-07445: exception encountered: core dump [ACCESS_VIOLATION] [_npierr+487] [PC:0x5F22C3] [ADDR:0x4] [UNABLE_TO_READ] []

Tue Jan 08 19:03:57 2008
Errors in file f:\oraclexe\app\oracle\admin\xe\bdump\xe_s000_1816.trc:
ORA-07445: exception encountered: core dump [ACCESS_VIOLATION] [_npierr+487] [PC:0x5F22C3] [ADDR:0x4] [UNABLE_TO_READ] []

Tue Jan 08 19:03:58 2008
Errors in file f:\oraclexe\app\oracle\admin\xe\bdump\xe_s001_3056.trc:
ORA-07445: exception encountered: core dump [ACCESS_VIOLATION] [_npierr+487] [PC:0x5F22C3] [ADDR:0x4] [UNABLE_TO_READ] []

Tue Jan 08 19:04:03 2008
found dead shared server 'S000', pid = (14, 2)
Tue Jan 08 19:04:03 2008
Errors in file f:\oraclexe\app\oracle\admin\xe\bdump\xe_s002_312.trc:
ORA-07445: exception encountered: core dump [ACCESS_VIOLATION] [_npierr+487] [PC:0x5F22C3] [ADDR:0x4] [UNABLE_TO_READ] []

Tue Jan 08 19:05:03 2008
found dead shared server 'S001', pid = (15, 2)
found dead shared server 'S002', pid = (16, 1)
Tue Jan 08 19:05:30 2008
Errors in file f:\oraclexe\app\oracle\admin\xe\bdump\xe_s002_2864.trc:
ORA-07445: exception encountered: core dump [ACCESS_VIOLATION] npierr+487] [PC:0x5F22C3] [ADDR:0x4] [UNABLE_TO_READ] []

Tue Jan 08 19:06:03 2008
found dead shared server 'S002', pid = (16, 2)

simulyf

Usually ORA 7445 messages get reported to Oracle Support on enterprise versions, not sure what happens with XE.

Has the database been aborted recently? an improper shutdown? Perhaps through a server/PC crash or something?

I would be tempted to stop and restart the database cleanly, re-run your application and see if you get the same errors appearing. Usually in the trc file the statement executed at the time of the problem is written, if you can't see anything like that then it looks like it may be an internal issue. See if the controlled stop/re-start helps first.

Karen

thanks a lot for your reply, karen.
the database is OK, all of my procs/functions/queries were running without any problem.
I have re-install the Oracle/Apex & os, still got the same error.

In the application I got this error, I create a query with a dblink to access to a Orale 8i remote server and this server has a bad performance sometimes (response time of a query over 1 mins while commonly it is under 100ms). The root cause should be in it but I still get no any solution till now.

I think, it is related to
BUG 5648872 - SCHEDULER: ORA-07445 [OPIDSA()+321] WHEN SETTING UP CHAIN

Kind regards,
Iloon