Warning in alert log file

Hai,
i received one warning in alert log file
Oracle instance running on a system with low open file descriptor limlit.
tune u r system to increase this limit to avaoid server performance degradation.
what we will take action regarding this?
Regards
dba

Looks like the number of open files you have are near the current file descriptor limit. Verify that by doing the following:
As root, issue the following:
# ulimit -a | grep -i descriptorsFrom SQL*Plus, issue the following:
SQL> show parameter db_files

Similar Messages

Errors appeared in alert log file should send an email

Hi,
I have one requirement to do, as i am new dba, i dont know how to do this,
sendmail is configured on my unix machine, but dont know how to send the errors appeared in alert logfile should send an email to administrator.
daily, it has to check the errors in alert log file, if any errors occurs(ORA- errors or WARNING errors) should send an email to administrator.
please help me how to do it

Hi,
There are many methods for interrogating the alert log and sending e-mail. Here are my notes:
http://www.dba-oracle.com/t_alert_log_monitoring_errors.htm
- PL/SQL or Java with e-mail alert: http://www.dba-village.com/village/dvp_papers.PaperDetails?PaperIdA=2383
- Shell script - Database independent and on same level as alert log file and e-mail.
- OEM - Too inflexible for complex alert log analysis rules
- SQL against the alert log - You can define the alert log file as an external table and detect messages with SQL and then e-mail.
Because the alert log is a server side flat file and because e-mail is also at the OS-level, I like to use a server side scell script. It's also far more robust then OEM, especially when combining and evaluating multiple alert log events. Jon Emmons has great notes on this:
http://www.lifeaftercoffee.com/2007/12/04/when-to-use-shell-scripts/
If you are on Windows, see here:
http://www.dba-oracle.com/t_windows_alert_log_script.htm
For UNIX, Linux, Jon Emmons has a great alert log e-mail script.
Hope this helps . . . .
Donald K. Burleson
Oracle Press author

How to check particular error in alert log file

Hi all,
How to check particular error in alert log file,for supose if i get error in batabase yesterday 4 pm & today i want to check alert log file to get basic idea..it might be a big file so how to check that particular error..
Thanks & regards,
Eswar..

What's your oracle version?
If you are in 11g you can use adrci tool
1- set homes diag/rdbms/orawiss/ORAWISS/ : the rdbms home
2- show alert -P "MESSAGE_TEXT LIKE '%ORA-%'" -term : to find all the ORA-% errors in the alert file
3- show alert -P "MESSAGE_TEXT LIKE '%ORA-%' and originating_timestamp > systimestamp-51 " -term : to find all the ORA-% errors in the alert file during the last 51 days,
4- show alert -P "MESSAGE_TEXT LIKE '%ORA-%' and originating_timestamp > systimestamp-1/24 " -term : to find all the ORA-% errors in the alert file during the last hour,
5- show alert -P "MESSAGE_TEXT LIKE '%ORA-12012%' and originating_timestamp > systimestamp-1/24 " -term : to find the particular ORA-12012 error in the alert file during the last hour,
Example:
[oracle@wissem wissem]$ adrci
ADRCI: Release 11.2.0.1.0 - Production on Wed May 4 10:24:54 2011
Copyright (c) 1982, 2009, Oracle and/or its affiliates. All rights reserved.
ADR base = "/home/oracle/app/oracle"
adrci> set homes diag/rdbms/orawiss/ORAWISS/
adrci> show alert -P "MESSAGE_TEXT LIKE '%ORA-'" -term
ADR Home = /home/oracle/app/oracle/diag/rdbms/orawiss/ORAWISS:
adrci> show alert -P "MESSAGE_TEXT LIKE '%ORA-%'" -term
ADR Home = /home/oracle/app/oracle/diag/rdbms/orawiss/ORAWISS:
2010-12-11 19:45:41.289000 +01:00
ORA-1109 signalled during: ALTER DATABASE CLOSE NORMAL...
ORA-01547: warning: RECOVER succeeded but OPEN RESETLOGS would get error below
ORA-01152: file 1 was not restored from a sufficiently old backup
ORA-01110: data file 1: '/home/oracle/app/oracle/oradata/ORAWISS/system01.dbf'
ORA-1547 signalled during: ALTER DATABASE RECOVER database until time '2011-01-21:10:48:00' ...
Errors in file /home/oracle/app/oracle/diag/rdbms/orawiss/ORAWISS/trace/ORAWISS_j000_5692.trc:
ORA-12012: error on auto execute of job 29
ORA-01435: user does not exist
2011-03-15 11:39:37.571000 +01:00
opiodr aborting process unknown ospid (31042) as a result of ORA-609
2011-03-15 12:04:15.111000 +01:00
opiodr aborting process unknown ospid (3509) as a result of ORA-609
adrci>
adrci> show alert -P "MESSAGE_TEXT LIKE '%ORA-%' and originating_timestamp > systimestamp-51 " -term
ADR Home = /home/oracle/app/oracle/diag/rdbms/orawiss/ORAWISS:
2011-03-15 10:19:45.316000 +01:00
Errors in file /home/oracle/app/oracle/diag/rdbms/orawiss/ORAWISS/trace/ORAWISS_j006_5536.trc:
ORA-12012: error on auto execute of job 26
ORA-01435: user does not exist
Errors in file /home/oracle/app/oracle/diag/rdbms/orawiss/ORAWISS/trace/ORAWISS_j000_5692.trc:
ORA-12012: error on auto execute of job 29
ORA-01435: user does not exist
2011-03-15 11:39:37.571000 +01:00
opiodr aborting process unknown ospid (31042) as a result of ORA-609
2011-03-15 12:04:15.111000 +01:00
opiodr aborting process unknown ospid (3509) as a result of ORA-609
adrci>

Message in alert log file during the startup of the DB

Hi,
i have two instances, i have the same warning in the alert log file during the startup of the DB:
Oracle instance running on a system with low open file descriptor limit.
Tune your system to increase this limit to avoid severe performance degradation.
The db_files parameter was at 1024 for the two instances, i have set it to 300 for the first instance and 550 for second, the message for the first instance was droped(it's ok), but the message was there in the alert log for the second instance.
The two instance are on the same machine.
The number of the open file limit on the linux machine is equal to 1024.
I have shutdown the first instance (with db_files=300) the problem persits for the second instance (with db_files=550).
My question is how to determinate the right value of db_files parameter to avoid this message.
Regards.
Message was edited by:
learn

Increase the max number of open file on Linux or decrease db_files.
f the OS limit is 1024 db_files would have to be >= 472 for the message to be printed. t is printed if an instance is configured to access more datafiles than the OS-specific limit on the number of files that can be open in a single process. In this case the server will re-cycle the file descriptors.
Vadim Bobrov
Oracle Database Tools
http://www.fourthelephant.com

Will the informations be recorded in the alert.log file? -----No.168

will the informations about the loss of a temporary file be recorded in the alert.log file?

Yes, because whe your database starts needs to "mount" a tablespace with temporary files (case of tablespace "TEMP"). But don't worry with a loss of this tablespace because doesn't contain nothing when database starts.

Ora-07445 reported in the alert log file

Hi all,
We are using the following platform:-
OS: Solaris Operating System (SPARC 32-bit)
Oracle Server - Enterprise Edition / Product Version: 9.2.0.5.0
We encountered the following problem:-
There is Ora-07445 reported in the alert log file.
"ORA-07445: exception encountered: core dump [kgghash()+308] [SIGSEGV] [Address not mapped to object] [0x3222
000] [] []reported in the database."
These errors are signaled in more than 3 independent, unexplained, occurrences every day.
When this error occurred while User was accessing the application system, by right the case will be shown on the system, but they were no case found.
alert log are as below:-
Fri Jul 27 09:12:30 2007
Errors in file /disc3/oracle9205/RFDB/udump/rfdb_ora_27371.trc:
ORA-07445: exception encountered: core dump [kgghash()+340] [SIGSEGV] [Address not mapped to object] [0x3184000] [] []
Fri Jul 27 09:22:10 2007
Thread 1 advanced to log sequence 10730
Current log# 2 seq# 10730 mem# 0: /disc3/oracle9205/RFDB/RDO/logRFDB2a.rdo
Current log# 2 seq# 10730 mem# 1: /disc3/oracle9205/RFDB/RDO/logRFDB2b.rdo
Fri Jul 27 09:29:26 2007
Errors in file /disc3/oracle9205/RFDB/udump/rfdb_ora_27372.trc:
ORA-07445: exception encountered: core dump [kgghash()+296] [SIGSEGV] [Address not mapped to object] [0x3182000] [] []
The applications have encountered ora-3113 after a short period of time followed by ora-3114.
application log:-
RF0120-1 2007-Jul-27 09:46:57] Load m[RF0120-1 2007-Jul-27 09:29:30] SQLCODE: -3113
[RF0120-1 2007-Jul-27 09:29:30] Error Code -4105 returning from get score pan no.
[RF0120-1 2007-Jul-27 09:29:30] Message type :120
[RF0120-1 2007-Jul-27 09:29:30] Primary Account Number(PAN) DE0
02 :5440640155262702
[RF0120-1 2007-Jul-27 09:29:30] Processing code DE003 :003000
[RF0120-1 2007-Jul-27 09:29:30] Transaction amount DE004 :000000000001
[RF0120-1 2007-Jul-27 09:29:30] Settlement amount DE005 :000000000000
[RF0120-1 2007-Jul-27 09:29:30] Transmission Date and time
DE007 :0727092717
[RF0120-1 2007-Jul-27 09:29:30] Settlement conversion rate DE009 :60263158
[RF0120-1 2007-Jul-27 09:29:30] System trace audit no. DE011 :754710
[RF0120-1 2007-Jul-27 09:29:30] Local transaction time DE012 :092717
[RF0120-1 2007-Jul-27 09:29:30] Local transaction date DE013 :0727
[RF0120-1 2007-Jul-27 09:29:30] Expiration date D
E014 :0712
[RF0120-1 2007-Jul-27 09:29:30] Settlement date DE015 :0727
[RF0120-1 2007-Jul-27 09:29:30] Merchant type DE018 :5311
[RF0120-1 2007-Jul-27 09:29:30] Point-of-service(POS) entry code DE022 :051
[RF0120-1 2007-Jul-27 09:29:30] Acquiring inst. ID code DE032 :001912
[RF0120-1 2007-Jul-27 09:29:30] Forwarding Inst. ID code DE033 :001912
[RF0120-1 2007-Jul-27 09:29:30] Retrieval ref. no.
DE037 :754710356390
[RF0120-1 2007-Jul-27 09:29:30] Autholization ID response DE038 :356390
[RF0120-1 2007-Jul-27 09:29:30] Response code DE039 :00
[RF0120-1 2007-Jul-27 09:29:30] Card acceptor terminal ID DE041 :19306002
[RF0120-1 2007-Jul-27 09:29:30] Card acceptor ID code DE042 :000001106
020132
[RF0120-1 2007-Jul-27 09:29:30] Card acceptor Name/Location
What could have caused the above mentioned errors i.e Ora-07445 ; ora-3113 / ora-3114? How to resolve the problem.
Please help .
Thanks.

i am also facing the same some time in ora 9.2.0.6 on Sun OS 9 SPARC 64-bits
Errors in file /oracle/oracle9i/admin/FINPROD/udump/finprod_ora_6076.trc:
ORA-07445: exception encountered: core dump [0000000100FDE088] [SIGSEGV] [Address not mapped to object] [0x00000013A] [] []
Thu Aug 30 08:52:39 2007
Errors in file /oracle/oracle9i/admin/FINPROD/udump/finprod_ora_6078.trc:
ORA-07445: exception encountered: core dump [0000000100FDE088] [SIGSEGV] [Address not mapped to object] [0x00000013A] [] []
Thu Aug 30 09:41:49 2007

"Error in the alert log file " - please help

Hi ALL,
I am getting following errors in the alert log frequently.
My database version is:
Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - 64bi
PL/SQL Release 10.2.0.1.0 - Production
CORE 10.2.0.1.0 Production
TNS for IBM/AIX RISC System/6000: Version 10.2.0.1.0 - Productio
NLSRTL Version 10.2.0.1.0 - Production
Thu Aug 30 16:58:19 2007
Memory Notification: Library Cache Object loaded into SGA
Heap size 2172K exceeds notification threshold (2048K)
KGL object name :select object_name from all_objects where object_name='TOAD_PROFILER' and object_type='PACKAGE'
Thu Aug 30 17:09:36 2007
************************************************************************************

Additionally you can visit here:
Alert Error from trc files--Heap size 5236K exceeds notification threshold
geting error in alert log file
Adith

Trace file with different name is alert log file.

I am strange today
i found a trace file generated in alert log file with name
/bdump/stlbas_cjq0_1880.trc:
but when i am trying to find out in bdump folder i cannot found
any file with this named. instead i found /bdump/stlbas_cjq0_1853.trc
is there any possibility of being this scenario ?
database version:- 10.2.0.4
Os:- sun solaries spark 64 bits
Regards
Halim

The trace file has been removed/deleted from an OS user. I think you should verify that with OS logs.
Thanks

Errors in Alert log file

Hi,
I have encountered following errors in alrt log file, its strange to see FAST_START_MTTR_TARGET is out of valid and aksing to use another value and that value is changing every second, it should be in increasing order or it should be consistent. I think i have a serious problem, so anyone could help me out on this. I am getting this "FAST_START_MTTR_TARGET 121 is out of the valid MTTR range, use 24381 instead" error regurarly.
FAST_START_MTTR_TARGET 121 is out of the valid MTTR range, use 24381 instead.
Wed Jan 16 23:40:34 2008
Completed checkpoint up to RBA [0x2aadb.2.10], SCN: 5473742880
Wed Jan 16 23:45:51 2008
FAST_START_MTTR_TARGET 121 is out of the valid MTTR range, use 24017 instead.
Wed Jan 16 23:46:21 2008
FAST_START_MTTR_TARGET 121 is out of the valid MTTR range, use 23647 instead.
Wed Jan 16 23:46:52 2008
FAST_START_MTTR_TARGET 121 is out of the valid MTTR range, use 23298 instead.
Wed Jan 16 23:47:22 2008
FAST_START_MTTR_TARGET 121 is out of the valid MTTR range, use 22906 instead.
Wed Jan 16 23:47:52 2008
FAST_START_MTTR_TARGET 121 is out of the valid MTTR range, use 22507 instead.
Wed Jan 16 23:48:22 2008
FAST_START_MTTR_TARGET 121 is out of the valid MTTR range, use 22133 instead.
Wed Jan 16 23:48:52 2008
FAST_START_MTTR_TARGET 121 is out of the valid MTTR range, use 21786 instead.
Wed Jan 16 23:49:22 2008
FAST_START_MTTR_TARGET 121 is out of the valid MTTR range, use 21443 instead.
Wed Jan 16 23:49:52 2008
FAST_START_MTTR_TARGET 121 is out of the valid MTTR range, use 21062 instead.
Wed Jan 16 23:50:22 2008
FAST_START_MTTR_TARGET 121 is out of the valid MTTR range, use 20698 instead.
Wed Jan 16 23:53:53 2008
Incremental checkpoint up to RBA [0x2aadb.31b4.0], current log tail at RBA [0x2aadb.3e38.0]
Thu Jan 17 00:00:54 2008
FAST_START_MTTR_TARGET 121 is out of the valid MTTR range, use 19582 instead.
FAST_START_MTTR_TARGET 121 is out of the valid MTTR range, use 16287 instead.
Thu Jan 17 00:34:01 2008
FAST_START_MTTR_TARGET 121 is out of the valid MTTR range, use 15902 instead.
Thu Jan 17 00:34:31 2008
FAST_START_MTTR_TARGET 121 is out of the valid MTTR range, use 14638 instead.
Thu Jan 17 00:35:01 2008
FAST_START_MTTR_TARGET 121 is out of the valid MTTR range, use 13600 instead.
Thu Jan 17 00:35:31 2008
FAST_START_MTTR_TARGET 121 is out of the valid MTTR range, use 12773 instead.
Thu Jan 17 00:36:02 2008
FAST_START_MTTR_TARGET 121 is out of the valid MTTR range, use 12460 instead.
Thu Jan 17 00:36:32 2008
FAST_START_MTTR_TARGET 121 is out of the valid MTTR range, use 12338 instead.
Thu Jan 17 00:37:01 2008
Process P187 died, see its trace file
Thu Jan 17 00:37:02 2008
FAST_START_MTTR_TARGET 121 is out of the valid MTTR range, use 12248 instead.
Thu Jan 17 00:37:02 2008
Process P188 died, see its trace file
Thu Jan 17 00:37:03 2008
Process P189 died, see its trace file
Thu Jan 17 00:37:04 2008
Process P190 died, see its trace file
Thu Jan 17 00:37:16 2008
Process J000 died, see its trace file
Thu Jan 17 00:37:16 2008
kkjcre1p: unable to spawn jobq slave process
Thu Jan 17 00:37:16 2008
Errors in file /oracle/BP3/saptrace/background/bp3_cjq0_4788.trc:
Process J000 died, see its trace file
Thu Jan 17 00:37:22 2008
kkjcre1p: unable to spawn jobq slave process
Thu Jan 17 00:37:22 2008
Errors in file /oracle/BP3/saptrace/background/bp3_cjq0_4788.trc:
Thanks
Jafar

This parameter, FAST_START_MTTR_TARGET ranges from 0 to 3600 seconds. It is important to specify your oracle version, since a similar issue is reported for the 10gR1 release.
The solution for it would be to increase the value to the suggested one in the alert.log file, but it could be completely out of range from the valid values, so set it to zero and let the oracle instance calculate the value. You can check the output at the V$INSTANCE_RECOVERY view at the columns TARGET_MTTR, and ESTIMATED_MTTR prior to proceeding with modificaiton.
On the other hand, I suggest you to read this metalink note
Kkjcre1p: Unable To Spawn Jobq Slave Process, Error 1089
Doc ID: Note:344275.1
for the Kkjcre1p error message.
~ Madrid

RMAN success, but errors in alert.log file

My RMAN backup script runs well, but generates errors in alert.log file.
Here is the trace file contents:
/usr/lib/oracle/xe/app/oracle/admin/XE/udump/xe_ora_3990.trc
Oracle Database 10g Express Edition Release 10.2.0.1.0 - Production
ORACLE_HOME = /usr/lib/oracle/xe/app/oracle/product/10.2.0/server
System name: Linux
Node name: plockton
Release: 2.6.18-128.2.1.el5
Version: #1 SMP Wed Jul 8 11:54:54 EDT 2009
Machine: i686
Instance name: XE
Redo thread mounted by this instance: 1
Oracle process number: 26
Unix process pid: 3990, image: oracle@plockton (TNS V1-V3)
*** 2009-07-23 23:05:01.835
*** ACTION NAME:(0000025 STARTED111) 2009-07-23 23:05:01.823
*** MODULE NAME:(backup full datafile) 2009-07-23 23:05:01.823
*** SERVICE NAME:(SYS$USERS) 2009-07-23 23:05:01.823
*** SESSION ID:(33.154) 2009-07-23 23:05:01.823
*** 2009-07-23 23:05:18.689
*** ACTION NAME:(0000045 STARTED111) 2009-07-23 23:05:18.689
*** MODULE NAME:(backup archivelog) 2009-07-23 23:05:18.689
Does anyone know why? Thanks.
Richard

I'm not sure if this will answer your question or not, but I believe these messages can likely be ignored.
I'm currently running 10.2.0.1.0 Enterprise Edition in pre-production (yes, I know I should apply the latest patchset and I plan to do so as soon as I get a development box allocated to me and can test it's impact). I see the same types of messages that you've reported with each of my regularly-scheduled backups:
a) The alert_<$SID>.log reports that there are errors in trace files:
Mon Aug 10 04:33:49 2009
Starting control autobackup
Mon Aug 10 04:33:50 2009
Errors in file /opt/oracle/admin/blah/udump/blah_ora_32520.trc:
Mon Aug 10 04:33:50 2009
Errors in file /opt/oracle/admin/blah/udump/blah_ora_32520.trc:
Mon Aug 10 04:33:50 2009
Errors in file /opt/oracle/admin/blah/udump/blah_ora_32520.trc:
Control autobackup written to DISK device
handle '/backup/physical/BLAH/RMAN/cf_c-2740124895-20090810-00'
b) The .trc files, when you look at them contain no errors - only these "informational" messages:
*** 2009-08-10 04:33:50.781
*** ACTION NAME:(0000105 STARTED111) 2009-08-10 04:33:50.754
*** MODULE NAME:(backup archivelog) 2009-08-10 04:33:50.754
*** SERVICE NAME:(SYS$USERS) 2009-08-10 04:33:50.754
*** SESSION ID:(126.28030) 2009-08-10 04:33:50.754
c) I've verified that LOG_ARCHIVE_TRACE is set to 0:
SQL*Plus> show parameter log_archive_trace
NAME TYPE VALUE
log_archive_trace integer 0
As best I can discern from my own experience, these should just be ignored and I trust (read: "hope") they will simply go away once the latest patchset is applied. As for you running Oracle XE, a patchset is not an option, unfortunately.
V/R
-Eric

ORA- errors in alert log file

I wanted to know when the ORA- errors are reported into the alert.log file?
And which tye of errors are reported into it?
And if i wanted to log all the ORA-errors in the alert log then is there any setting for that?

You can find the type of errors reported in the link above.
Also, you maynot like to log ORA-00942: table or view does not exist, ORA-00904: : invalid identifier type of errors in alert.log - right? You may want to research at setting up events for generating trace files on specific error numbers you are looking at. That might resolve your problem - hth.

I am geting errors in my database alert log file ora-12012 and ora 44003

Hi all,
I am using oracle 10g ...10.2.0.1.0 and OS is solaris 10.......
i am geting these errors in my database alert log file last two days..i am not geting why it is coming?
ORA-12012: error on auto execute of job 8887
ORA-44003: invalid SQL name
and trace file is i got i am posting here please help any one is aware about this....
System name: SunOS
Node name: obrmzone1
Release: 5.10
Version: Generic_137111-06
Machine: sun4v
Instance name: ------
Redo thread mounted by this instance: 1
Oracle process number: 144
Unix process pid: 26874, image:--------- (J000)
*** ACTION NAME:(AUTO_SPACE_ADVISOR_JOB) 2011-06-10 22:00:49.372
*** MODULE NAME:(DBMS_SCHEDULER) 2011-06-10 22:00:49.372
*** SERVICE NAME:(SYS$USERS) 2011-06-10 22:00:49.372
*** SESSION ID:(110.7114) 2011-06-10 22:00:49.372
*** 2011-06-10 22:00:49.372
ORA-12012: error on auto execute of job 8887
ORA-44003: invalid SQL name
thank you in advance,
Dav

I just google with "ORA-44003: invalid SQL name" and found below link:
http://www.oracle-base.com/articles/10g/dbms_assert_10gR2.php
SIMPLE_SQL_NAME
The SIMPLE_SQL_NAME function checks the input string conforms to the basic characteristics of a simple SQL name:
The first character of the name is alphabetic.
The name only contains alphanumeric characters or the "_", "$", "#"
Quoted names must be enclosed by double quotes and may contain any characters, including quotes provided they are represented by two quotes in a row ("").
The function ignores leading and trailing white spaces are ignored
The length of the input string is not validated.

Checkpoint not complete in alert log file Oracle 11gR2 RAC

Hi,
I found checkpoint not complete in alert log file, almost every 3 seconds .
In metalink i saw for this error, archive_lag_target=0, already this value was set to 0 in my database.
We have 7 redo log groups for each instance, each group is of two redo log files, each file size is 50m.
To avoid this error what i need to do..........
please help me..................

When you "checkpoint not complete" messages in your alert log this normally means your online redo logs are defined too small to handle the load and you have filled and need to switch to a new online redo log before the checkpoint triggered by the previous log switch has been completed.
Increasing your online redo log size is normally the fix for this.
HTH -- Mark D Powell --
PS - The following Oracle support document may also apply:
Checkpoint Not Complete In Alert.log Due To Setting Of Archive_lag_target [ID 435780.1]
Edited by: Mark D Powell on Nov 7, 2011 8:29 AM

Question regarding alert log file and trace files

What should be the alert log file size ? And when should it be deleted? And for how many days user trace files should be kept?
Also will anyone please tell me the importance of these files.
Thanks

This may help: http://download-east.oracle.com/docs/cd/B19306_01/server.102/b14231/manproc.htm#sthref729
There are a few discussions on it here:
Re: Alert Log File
alert log file contents viewing
Re: how to read alert log file? is there any tool available?

Alert Log file

Hi,
I'm new at administrating a database (11.2.0.2 on OEL).
1) How often one need to see the alert log file?
2) Why are some Oracle errors not logged in the Alert Log?

Hello,
I wouldn't look in the alert log for performance problems either. At least not immediately, but I would take a quick look in there to see if there were any major problems. The alert log is a good place to look first to check the overall health of the DB because any major errors will be written there.
You can use the Enterprise Manager to automatically email you if certain errors are raised in the alert log.
Also, you can search through the alert log using the [url http://www.ora00600.com/wordpress/scripts/databaseconfig/adrci/]ADRCI utility which can be pretty useful.
Rob

Warning in alert log file

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