Urgent Database Down - alert log file

Hi Guru's
this is the alert log file - today morning production database went down - any one can you please let me know the problem area!
Thread 1 advanced to log sequence 17563
Current log# 4 seq# 17563 mem# 0: E:\ORACLE\ORADATA\PNLDB\REDO04.LOG
Thu Jan 26 08:12:56 2006
KCF: write/open error block=0x7f0bc online=1
file=12 F:\ORACLE\ORADATA\PNLDB\USERS02.DBF
error=27069 txt: 'OSD-04026: Invalid parameter passed. (OS 520380)'
Thu Jan 26 08:12:57 2006
Errors in file f:\oracle\admin\pnldb\udump\pnldb_ora_1420.trc:
ORA-01115: IO error reading block from file 12 (block # 517514)
ORA-01110: data file 12: 'F:\ORACLE\ORADATA\PNLDB\USERS02.DBF'
ORA-27091: skgfqio: unable to queue I/O
ORA-27069: skgfdisp: attempt to do I/O beyond the range of the file
OSD-04026: Invalid parameter passed. (OS 517513)
ORA-01115: IO error reading block from file 12 (block # 132287)
ORA-01110: data file 12: 'F:\ORACLE\ORADATA\PNLDB\USERS02.DBF'
ORA-27091: skgfqio: unable to queue I/O
ORA-27069: skgfdisp: attempt to do I/O beyond the range of the file
OSD-04026: Invalid parameter passed. (OS 132286)
Thu Jan 26 08:12:57 2006
Errors in file f:\oracle\admin\pnldb\bdump\pnldb_dbw0_956.trc:
ORA-01242: data file suffered media failure: database in NOARCHIVELOG mode
ORA-01114: IO error writing block to file 12 (block # 520380)
ORA-01110: data file 12: 'F:\ORACLE\ORADATA\PNLDB\USERS02.DBF'
ORA-27069: skgfdisp: attempt to do I/O beyond the range of the file
OSD-04026: Invalid parameter passed. (OS 520380)
DBW0: terminating instance due to error 1242
Thu Jan 26 08:12:59 2006
Errors in file f:\oracle\admin\pnldb\udump\pnldb_ora_1420.trc:
ORA-00603: ORACLE server session terminated by fatal error
ORA-01115: IO error reading block from file 12 (block # 517514)
ORA-01110: data file 12: 'F:\ORACLE\ORADATA\PNLDB\USERS02.DBF'
ORA-27091: skgfqio: unable to queue I/O
ORA-27069: skgfdisp: attempt to do I/O beyond the range of the file
OSD-04026: Invalid parameter passed. (OS 517513)
ORA-01115: IO error reading block from file 12 (block # 132287)
ORA-01110: data file 12: 'F:\ORACLE\ORADATA\PNLDB\USERS02.DBF'
ORA-27091: skgfqio: unable to queue I/O
ORA-27069: skgfdisp: attempt to do I/O beyond the range of the file
OSD-04026: Invalid parameter passed. (OS 132286)
Thu Jan 26 08:12:59 2006
Errors in file f:\oracle\admin\pnldb\bdump\pnldb_pmon_3804.trc:
ORA-01242: data file suffered media failure: database in NOARCHIVELOG mode
Instance terminated by DBW0, pid = 956
Thanks
Ravi

You are having problems on disks E\ and F\ - possibly hardware problems.
(Hopefully these disks are not network drives. If they are, your problem might be network contention. Network mounted drives are never a good idea for databases.)
If this is truly urgent, then I encourage you to use your Oracle Support contract to open a service request for assistance.

Similar Messages

Shell script for oracle alert.log file

Hi Gurus,
I wanted to write shell script to know the last 10 shutdown timings of the database from alert log file. I'm working on oracle 9i.
Could anyone please advice on this.
Thanks in advance
regards,
Shaan
Edited by: Shaan_dmp on Jan 5, 2009 1:27 PM
Edited by: Shaan_dmp on Jan 5, 2009 1:28 PM

Use awk. I don't have a 9i to hand but here is a very simple version for 10g XE
My awk file (the line numbers are for the notes below - don't include them:
01:BEGIN { prevline = "";}
02:
03:/Completed: alter database close/ {print prevline,FS,$0;}
04:
05:{prevline = $0;}The command line and results (from my 300k alert log)
$ awk -f alert.awk.txt alert_xe.log
Fri Apr 11 18:08:40 2008   Completed: alter database close normal
Fri May 16 18:53:21 2008   Completed: alter database close normal
Tue May 20 17:28:23 2008   Completed: alter database close normal
Thu Jul 17 19:08:52 2008   Completed: alter database close normal
Fri Aug 15 15:12:48 2008   Completed: alter database close normal
Wed Nov 05 08:52:59 2008   Completed: alter database close normal
Fri Nov 14 16:36:03 2008   Completed: alter database close normal
Tue Dec 09 10:46:23 2008   Completed: alter database close normal
Mon Jan 05 11:12:22 2009   Completed: alter database close normalWhat it means:
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3) at line 05 is an instruction we do on every line - so we remember it in case it is the timestamp for the shutdown.
Now, you can include more of the corner cases for shutdowns by adding more search patterns etc. For more information, google for awk examples.
Awk is really good at this sort of thing!
HTH
Regards Nigel

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.

Alert log file of the database is too big

Dear Experts?
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We have the below challenges before going for an database upgrade ?
We have observed that the customer database alert_SID.log (9.2.0.6) size is 2.5GB ? how to purge this file ? Please advise
Please also note that our Instance is running on the Oracle Enterprise Linux 4 update 8
Regards
Mohammed.

user977334 wrote:
Dear Experts?
Let me update you that we are in process of doing an R12.1 upgrade ? And Our Current Instance is running on the 11.5.10 with 9.2.0.6 ?
We have the below challenges before going for an database upgrade ?
We have observed that the customer database alert_SID.log (9.2.0.6) size is 2.5GB ? how to purge this file ? Please advise
Please also note that our Instance is running on the Oracle Enterprise Linux 4 update 8
Regards
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--neeraj

Problem in creating database -Missing Redo log file

I am try to create a new database using DBCA .While creating a database it shows the error oracle instance terminated.Force Disconnected.
My alert log file is
Errors in file /u01/app/oracle/diag/rdbms/oracl/oracl/trace/oracl_ora_5424.trc:
ORA-00313: open failed for members of log group 1 of thread 1
ORA-00312: online log 1 thread 1: '/u01/app/oracle/oradata/oracl/redo01.log'
ORA-27037: unable to obtain file status
Linux-x86_64 Error: 2: No such file or directory
Additional information: 3
Wed Nov 06 10:07:27 2013
Errors in file /u01/app/oracle/diag/rdbms/oracl/oracl/trace/oracl_ora_5424.trc:
ORA-00313: open failed for members of log group 2 of thread 1
ORA-00312: online log 2 thread 1: '/u01/app/oracle/oradata/oracl/redo02.log'
ORA-27037: unable to obtain file status
Linux-x86_64 Error: 2: No such file or directory
Additional information: 3
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ORA-00313: open failed for members of log group 3 of thread 1
ORA-00312: online log 3 thread 1: '/u01/app/oracle/oradata/oracl/redo03.log'
ORA-27037: unable to obtain file status
Linux-x86_64 Error: 2: No such file or directory
Additional information: 3
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Setting recovery target incarnation to 2
Wed Nov 06 10:07:38 2013
Assigning activation ID 1876274518 (0x6fd5ad56)
Thread 1 opened at log sequence 1
Current log# 1 seq# 1 mem# 0: /u01/app/oracle/oradata/oracl/redo01.log
Successful open of redo thread 1
Wed Nov 06 10:07:38 2013
MTTR advisory is disabled because FAST_START_MTTR_TARGET is not set
Wed Nov 06 10:07:38 2013
SMON: enabling cache recovery
Errors in file /u01/app/oracle/diag/rdbms/oracl/oracl/trace/oracl_ora_5424.trc (incident=1345):
ORA-00600: internal error code, arguments: [kpotcgah-7], [12534], [ORA-12534: TNS:operation not supported
Incident details in: /u01/app/oracle/diag/rdbms/oracl/oracl/incident/incdir_1345/oracl_ora_5424_i1345.trc
Wed Nov 06 10:07:46 2013
Trace dumping is performing id=[cdmp_20131106100746]
Errors in file /u01/app/oracle/diag/rdbms/oracl/oracl/trace/oracl_ora_5424.trc:
ORA-00600: internal error code, arguments: [kpotcgah-7], [12534], [ORA-12534: TNS:operation not supported
Error 600 happened during db open, shutting down database
USER (ospid: 5424): terminating the instance due to error 600
Instance terminated by USER, pid = 5424
ORA-1092 signalled during: alter database "oracl" open resetlogs...
ORA-1092 : opiodr aborting process unknown ospid (5424_47935551851664)
Wed Nov 06 10:07:47 2013
ORA-1092 : opitsk aborting process
251,1 95%

>I am try to create a new database using DBCA
>Please help me to resolve this issue.My redo log file was missing
DROP and recreate the database. It is a *new* database without any data.
Check what datafile locations and redo log file locations you specify when creating the new database. Check if you have permissions and enough disk space.
Hemant K Chitale

Oracle 9i (SE) Solaris 9 (Alert.log file)

Hi Guys,
How do I clean up my alert.log file. Do I have to delete it completely or only delete the content of the file.
Thank you.

Laura Gaigala wrote:
Why You want to clean up it? Too large or some other reasons?
If You have some planned db restart, then during restart rename archive.log and upon startup it will be created automaticaly again.
If no restart is planned, then delete it's content, but before that make a copy of alert.log. Just in order You will need to find something.Actually, I've found that it is quite safe to rename the alert.log right out from under a running database. It will simply start a new one with the next message to be written. However, I agree it is much nicer to do this housekeeping while the db is down, so that the first entry in an alert log is the startup.
This renameing of the log against a running process does not work for the listener log. I've found that if I rename listener.log to listener.log.1, the listener will continue to log to the original file (now listener.log.1) until such time as it is restarted. THEN it will start a new listener.log.
This was all on unix. Windows may behave differently.

Error in alert log files

Hi,
I am working on oracle10.2.0.4 and o/s is HP-UX .
In alert log ifle of database i found follwoing messages.
ksvcreate: Process(m000) creation failed
Wed Sep 1 09:09:02 2010
Process m000 died, see its trace file
Wed Sep 1 09:09:02 2010
ksvcreate: Process(m000) creation failed
By using TOP command checked that load on database server was very high...
383 processes: 347 sleeping, 35 running, 1 zombie
Cpu states:
CPU LOAD USER NICE SYS IDLE BLOCK SWAIT INTR SSYS
0 1.67 *97.2%* 0.0% 6.8% 0.0% 0.0% 0.0% 0.0% 0.0%
1 1.68 *96.6%* 0.0% 10.4% 0.0% 0.0% 0.0% 0.0% 0.0%
avg 1.67 *97.4%* 0.0% 8.6% 0.0% 0.0% 0.0% 0.0% 0.0%
Memory: 11087320K (6724692K) real, 12604944K (7680860K) virtual, 924024K free Page# 1/19
CPU TTY PID USERNAME PRI NI SIZE RES STATE TIME %WCPU %CPU COMMAND
1 ? 16530 oracle10 235 20 8969M 5180K run 0:52 27.80 27.75 oraclePROD2
0 ? 16536 oracle10 241 20 8969M 5116K run 2:55 20.57 20.53 oraclePROD2
1 ? 16523 oracle10 234 20 8969M 5116K run 0:27 20.18 20.15 oraclePROD2
This time application was down .....and we restarted applicaiton ...
IS this issue is realted to database .... ?
How to reolve this ...?
Edited by: oradba11 on Sep 1, 2010 1:00 PM
Edited by: oradba11 on Sep 1, 2010 1:00 PM

Yes , database was up and running ...
but in alert log file i got messages ...
and load on server was very high .. i put out put of top command ...
is this is realted to database ...?

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
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Additionally you can visit here:
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I am strange today
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The trace file has been removed/deleted from an OS user. I think you should verify that with OS logs.
Thanks

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

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
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*** 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

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

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

Urgent Database Down - alert log file

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