what setting to change to avoid the "unable to allocate new log"

Hello everyone.
I'm on 9i r2 on windows server 2003 edition of the SD with attached ISCSI. I have the drive 1 recovery as well as DBF newspaper group in the data directory. 2 other groups redo are on the 2 local disks separated and archiving logs (in another folder).

I'm getting some errors "cannot allocate new logs" every two days and in Event Viewer "process Archive error: Instance ORACLE prdps - cannot allocate Journal, check-in required.


I do not know what setting I should change.

Current configuration:
db_writer_processes 1
dbwr_io_slaves 0



Here is the output from v$ sysstat:
49 8 7410575 written DBWR checkpoint buffers
50 8 7748 written DBWR transaction table
51 DBWR undo block writes 8 4600265
52 DBWR revisited being written 8 5313 buffer
DBWR 53 free ask 8 26383
54 DBWR free buffers are 8 19838373
55 DBWR lru scans 21831-8
56 DBWR summed scan depth 8 21265425
57 8 21265425 scanned DBWR buffers
58 control DBWR 8 1719 points
59 DBWR cross instance writes 40 0
60 fusion DBWR written 40 0


It's alert.log:
Fri Mar 06 00:25:52 2009
Arc0: Complete 1 thread 1 log archiving sequence 7004
Fri Mar 06 00:25:54 2009
Thread 1 Advanced for you connect to sequence 7006
Currently Journal # 3 seq # 7006 mem # 0: E:\ORACLE\ORADATA\PRDPS\REDO03A. JOURNAL
Currently Journal # 3 seq # 7006 mem # 1: F:\ORACLE\ORADATA\PRDPS\REDO03B. JOURNAL
Currently Journal # 3 seq # 7006 mem # 2: G:\ORACLE\ORADATA\PRDPS\REDO03C. JOURNAL
Fri Mar 06 00:25:54 2009
Arc1: Evaluating archive log 2 thread 1 sequence 7005
Arc1: Begins to archive log 2 thread 1 sequence 7005
Creating archives LOG_ARCHIVE_DEST_1 destination: "F:\ORACLE\ORADATA\PRDPS\ARCHIVE\PRDPS_001_07005.ARC."
Fri Mar 06 00:26:03 2009
Thread 1 Advanced for you connect to sequence 7007
Currently journal # 1, seq # 7007 mem # 0: E:\ORACLE\ORADATA\PRDPS\REDO01A. JOURNAL
Currently journal # 1, seq # 7007 mem # 1: F:\ORACLE\ORADATA\PRDPS\REDO01B. JOURNAL
Currently journal # 1, seq # 7007 mem # 2: G:\ORACLE\ORADATA\PRDPS\REDO01C. JOURNAL
Fri Mar 06 00:26:03 2009
Arc0: Assessment of the archive log 2 thread 1 sequence 7005
Arc0: Impossible to archive log 2 thread 1 sequence 7005
Newspapers archived by another process
Arc0: Assessment of the 3 thread 1 sequence 7006 log archives
Arc0: Starts to archive log 3 thread 1 sequence 7006
Creating archives LOG_ARCHIVE_DEST_1 destination: "F:\ORACLE\ORADATA\PRDPS\ARCHIVE\PRDPS_001_07006.ARC."
Fri Mar 06 00:26:15 2009
Arc1: Finished 2 thread 1 log archiving sequence 7005
Arc1: Evaluating archive log 3 thread 1 sequence 7006
Arc1: Impossible to archive log 3 thread 1 sequence 7006
Newspapers archived by another process
Fri Mar 06 00:26:16 2009
Thread 1 cannot allot of new newspapers, sequence 7008
All newspapers need to check-in online
Currently journal # 1, seq # 7007 mem # 0: E:\ORACLE\ORADATA\PRDPS\REDO01A. JOURNAL
Currently journal # 1, seq # 7007 mem # 1: F:\ORACLE\ORADATA\PRDPS\REDO01B. JOURNAL
Currently journal # 1, seq # 7007 mem # 2: G:\ORACLE\ORADATA\PRDPS\REDO01C. JOURNAL
Thread 1 Advanced for you connect to sequence 7008
Currently Journal # 2 seq # 7008 mem # 0: E:\ORACLE\ORADATA\PRDPS\REDO02A. JOURNAL
Currently Journal # 2 seq # 7008 mem # 1: F:\ORACLE\ORADATA\PRDPS\REDO02B. JOURNAL
Currently Journal # 2 seq # 7008 mem # 2: G:\ORACLE\ORADATA\PRDPS\REDO02C. JOURNAL
Fri Mar 06 00:26:16 2009
Arc1: Evaluating archive log 3 thread 1 sequence 7006
Arc1: Impossible to archive log 3 thread 1 sequence 7006
Newspapers archived by another process
Arc1: Evaluating archive log 1 thread 1 sequence 7007
Arc1: Beginning to archive journal 1-wire 1 sequence 7007


Should I just change
db_writer_processes 1
dbwr_io_slaves 2

Thank you
Any help appreciated.

This message indicates that Oracle wants to re-use a redo log file, but
the
associated with corresponding control point is not over. In this case,.
Oracle
Wait for the control point is carried out entirely. This situation
may be encountered especially when transactional activity is
important.

search for:
-Background checkpoint started.
-Control your mat point.

These two statistics should not differ more than once. If it is

not true, your base weighs on the control points. LGWR does not reach
continue
next write operations that ends the control points.

Three reasons may explain this difference:

-A frequency of control points which is too high.
-A control points are starting but not filling not
-One DBWR writing too slowly.

How to resolve incomplete control points is through tuning
control points and
newspapers:

(1) gives the checkpoint process more time to scroll through newspapers
-Add more redo log groups
-increase the size of the logs again
(2) to reduce the frequency of control points
-increase the LOG_CHECKPOINT_INTERVAL
-increase the size of newspapers in restoration online
(3) improve the effectiveness of the control points for the CKPT process
CHECKPOINT_PROCESS = TRUE
(4) set LOG_CHECKPOINT_TIMEOUT = 0. This disables the verification script
based on
time interval.
(5) another way to solve this error is for DBWR to write quickly
the dirty
buffers to disk. The parameter associated with this task is:

DB_BLOCK_CHECKPOINT_BATCH.

DB_BLOCK_CHECKPOINT_BATCH specifies the number of blocks that are
dedicated
inside the batch size for writing the control points. When you want to
speed up
control points, it is necessary to increase this value.

Tags: Database

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