Switching log file

Hi all

Greeting of the day...

Please suggest on the underside...
need to do alter switch log file if the log file is not switched for 15 minutes
Thank you
Baskar.l

HI guys,.

First post here. When you implement Data Guard, no switch came in 15 minutes, I had to force the creation of files to archive log. found this parameter ARCHIVE_LAG_TARGET [http://download-west.oracle.com/docs/cd/B19306_01/server.102/b14237/initparams009.htm | http://download-west.oracle.com/docs/cd/B19306_01/server.102/b14237/initparams009.htm] and I must say that I used it on the main sites with RAC. He put on a value of 15 minutes (900 seconds) resolved. It doesn't change every 15 minutes, only 15 minutes after the last archived log file if there is no archived log generated at the same time.

Hope this is what you need.

Tags: Database

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    2012-10-09 22:17:25, 00000309 CSI info [SR] repair corrupted file [ml:520 {260}, l:76 {38}] '------? \C:\Windows\PolicyDefinitions\en-us"\[l:24{12}]"InetRes.adml' of the store

    2012-10-09 22:17:25, CSI Info 0000030a WARNING: file [l:24 {12}] "InetRes.adml" in [l:76 {38}] '-? ' "" \C:\Windows\PolicyDefinitions\en-us' switching property

    Old: Microsoft-Windows-InetRes - Adm.Resources, Version = 9.1.8112.16421, pA = PROCESSOR_ARCHITECTURE_AMD64 (9), Culture = [l:10 {5}] 'en-US', VersionScope = 1 nonSxS, PublicKeyToken = {l:8 b:31bf3856ad364e35}, Type neutral, TypeName neutral, PublicKey neutral

    New: Microsoft-Windows-InetRes - Adm.Resources, Version = 8.0.6001.18702, pA = PROCESSOR_ARCHITECTURE_INTEL (0), Culture = [l:10 {5}] 'en-US', VersionScope = 1 nonSxS, PublicKeyToken = {l:8 b:31bf3856ad364e35}, Type neutral, TypeName neutral, PublicKey neutral

    2012-10-09 22:17:25, created results CSI 0000030b repair Info:

    POQ 127 ends.
    2012-10-09 22:17:25, all repairs [SR] CSI Info 0000030 c
    2012-10-09 22:17:25, CSI Info 0000030 d [SR] validation of transaction
    2012-10-09 22:17:25, transaction CSI Info 0000030e Creating NT (seq 1), objectname [6] "(null) '"
    2012-10-09 22:17:25, CSI Info 0000030f NT created transaction (seq 1) result 0x00000000, manage @0x14c4
    2012-10-09 22:17:25, Info CSI 00000310@2012/10/10:02:17:25.662 CSI perf trace:
    CSIPERF:TXCOMMIT; 143298
    2012-10-09 22:17:25, Info CSI 00000311 [SR] check and complete repair operation. All of the files and registry keys listed in this operation were repaired successfully

    Hello

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    ===========================================

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    Rob Brown - Microsoft MVP<- profile="" -="" windows="" expert="" -="" consumer="" :="" bicycle=""><- mark="" twain="" said="" it="">

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    Hour of wait time wait for the event (s) (ms) /txn

    ---------------------------- ------------ ---------- ---------- ------ --------

    Synchronize 0 401 608 46 18 448 1.0 file log

    db file parallel write 124 044 0 3 404 27 0.3

    Enqueue 10 476 277 2 916 278 0.0

    DB file sequential read 261 947 0 2 435 9 0.7

    buffer busy waits 11 467 67 173 15 0.0

    SQL * Net more data to the client 1 565 619 0 79 0 3.9

    lock row cache 2 800 0 52 18 0.0

    control file parallel write 1 294 0 45 35 0,0

    Log end of switch file 261 0 36 138 0.0

    latch free 2 087 1 446 24 12 0.0

    PL/SQL 1 1 20 19531 0,0 lock timer

    log file parallel write 0 143 739 17 0.4 0

    db file scattered read 1 644 0 17 10 0.0

    sequential log file read 636 0 8 13 0.0


    Log buffer is about 1.3 MB. We could increase the log buffer, but there is no log buffer space waits, so I doubt this will help.


    Newspapers in recovery have their own file systems, not shared with the data files. This explains the difference between waiting avg on parallel writing of log (less than 1 ms) file and db file parallel write (27 ms).

    Restoring logs is 100 MB, there are about 120 journal switches per day.


    What has changed: the pads/validations rate grew. Several months ago there were 25 inserts/validations per second in the TRANSACTION_HISTORY table, now get us 110 inserts/validation per second.


    What problem it causes application: due to slow down the reaction of the basis of the application (Java-based) requires discussions more and more.


    MOS documents on synchronization of log file (for example, 1376916,1 waits for troubleshooting "log file sync") recommend to compare the average waiting time on synchronization of log file and the log file parallel write.

    If the values are close (for example log file sync = 20 ms and log file parallel write = 10 ms) so expectations are caused by nits IO. However, it is not the case here.


    There was a bug (2669566) in 9.2 which resulted in underreporting lgwr parallel time of writing to the log file. I was talking about September 2005, during which the bug was present in 9.2.0.6, reported 10.1 fixed in: file parallel journal written (JL Comp) it is possible that your problem IS written to the log file.

    Concerning

    Jonathan Lewis

  • How to resize the log files pending? or it is synchronized from primary?

    I changed the size of the log file primary db to 50 m to 200 m.

    I wonder if I should do it on the backup site?

    I tried, and it doesn't seem to work on the backup site:

    SQL > select group # thread #, status, bytes/1024/1024 of the journal of v$.

    GROUP # THREAD # STATUS BYTES/1024/1024
    ---------- ---------- ---------------- ---------------
    1 1 50 COMPENSATION
    2 1 50 COMPENSATION
    3 2 COMPENSATION 50
    4 2 50 CURRENT
    5 1 COMPENSATION 50
    6 2 COMPENSATION 50
    15 1 200 UNUSED
    16 1 200 UNUSED
    17 2 200 UNUSED
    18 2 200 UNUSED

    10 selected lines.

    SQL > alter database drop logfile Group 1;
    change the database drop 1 log file group
    *
    ERROR on line 1:
    ORA-01624: log 1 necessary for instance REMEPRDS1 (1 wire) crash recovery
    ORA-00312: thread 1 1 online journal:
    "+ DAT/prds/onlinelog/group_1.961.793523169".
    ORA-00312: thread 1 1 online journal:
    "+ FRA/prds/onlinelog/group_1.5605.793523169".


    SQL > alter system switch logfile;
    alter system switch logfile
    *
    ERROR on line 1:
    ORA-16000: database opened for read-only access


    SQL > alter system switch logfile;
    alter system switch logfile
    *
    ERROR on line 1:
    ORA-16000: database opened for read-only access


    SQL > /.
    alter system switch logfile
    *
    ERROR on line 1:
    ORA-16000: database opened for read-only access


    SQL > alter database drop logfile Group 1;
    change the database drop 1 log file group
    *
    ERROR on line 1:
    ORA-01624: log 1 necessary for instance PRDS1 (1 wire) crash recovery
    ORA-00312: thread 1 1 online journal:
    "+ DAT/prds/onlinelog/group_1.961.793523169".
    ORA-00312: thread 1 1 online journal:
    "+ FRA/prds/onlinelog/group_1.5605.793523169".


    SQL >

    Please help me out here.

    Thank you

    Hello

    Even if you add standby or online redo log files or even if you resize down and re-create redo log files, they will not be created on the standby database. It is instance specific.

    Let all the restore, the MRP will cancel out.
    And then let fall, add standby redo log files, I think that you need to the MANUAL upgrade standby_file_management before adding new files of newspapers waiting for redo. And do not forget to undo file management the AUTO value again after the execution of the changes.

    And you train to make the journal command pending, it applies only on the primaries because the log command can only be performed on the database that uses online redo log files. Even if you open databases Eve with recovery that no recovery will be generated as a result no switch journal is allowed too.

  • Arc1: 19504 error creating archive log file... after the NFS configuration

    I use an Oracle 11.2.0.3 on RHEL 5.7 (no ASM or RAC) database

    We have our archiving logs off copied to a backup location external via a cron job and rsync command, and I want to switch to NFS.
    NAME                         TYPE      VALUE
------------------------------------ ----------- ------------------------------
log_archive_format               string      RCAT_%t_%s_%r.arc
log_archive_dest_1               string      location=USE_DB_RECOVERY_FILE_DEST

SQL> !df -h
Filesystem                 Size  Used Avail Use% Mounted on
...
...
backups:/ARCHLOG/rman       12T  7.8T  3.5T  70% /mnt/nfs_archlog

SQL> alter system set log_archive_dest_2='LOCATION=/mnt/nfs_archlog optional' scope=both;

System altered.
    When I run 'alter system archive log current', I see the error message archiver in the alert below log...
    Wed Aug 29 14:42:08 2012
ALTER SYSTEM ARCHIVE LOG
Wed Aug 29 14:42:08 2012
Thread 1 advanced to log sequence 23044 (LGWR switch)
  Current log# 4 seq# 23044 mem# 0: /u01/oradata/RCAT/redo_4a.dbf
  Current log# 4 seq# 23044 mem# 1: /u02/oradata/RCAT/redo_4b.dbf
Wed Aug 29 14:42:14 2012
ARC1: Error 19504 Creating archive log file to '/mnt/nfs_archlog/RCAT_1_23043_602355789.arc'
Archived Log entry 24282 added for thread 1 sequence 23043 ID 0x165341cd dest 1:
    However, when I check the NFS location I see that the file is there.
    [oracle@rman nfs_archlog]$ ls -la
total 72
drwxr-x--- 14 oracle oinstall   4096 Aug 29 14:42 .
drwxr-xr-x  3 root   root       4096 Aug 29 14:16 ..
-rw-r-----  1 oracle oinstall 204288 Aug 29 14:42 RCAT_1_23043_602355789.arc
    On the NFS host, I see
    [root@backups archivelog]# ls -la
total 68
drwxr-x---. 14 500 500   4096 Aug 29 14:42 .
drwxrwxr--.  3 500 500   4096 May  8 13:54 ..
-rw-r-----.  1 500 500 204288 Aug 29 14:42 RCAT_1_23043_602355789.arc
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    Is there something obvious that I'm missing?

    the folder is created by newspaper archive must have atleat authorisation from 770.

  • bottleneck during the passage of the redo log files.

    Hi all

    I'm using Oracle 11.2.0.3.

    The enforcement team has indicated that they are facing slow at some point.

    I followed the database and I found that at some passage of redo log files (not always), I am facing a slow at the application level.

    I have 2 son since my database is CARS, each thread has 3 groups of multiplexed redo logs the FIU, with size of 300 MB each.

    Is it possible to optimize the switch of the redo log files? knowing that my database is running in ARCHIVELOG mode.

    Kind regards

    Hello

    Yes, Oracle recommends 1 validation by 30 calls from users or less. Of course, every database is different, so this rule cannot be taken too literally, but in your case, this rule seems to apply. In any case State, 900 undertakes seconds it looks like a very large number and the need for a high number of transactions should be questioned. You should talk to your analysts/application management/enterprise architect if warranted - that is to say if the application does in fact almost 2 000 business transactions per second.

    What about DB CPU: here is a link to a blog that I wrote on this subject, it should help to better understand this number:

    http://Savvinov.com/2012/04/06/AWR-reports-interpreting-CPU-usage/

    But briefly: DB processor isn't a real event, it is simply an indication that the sessions are on CPU (or waiting for CPU) rather than wait on i/o requests or events in the database. It is not necessarily a bad thing, because the database must perform tasks and he cannot do without loading the CPU. It may indicate a problem in two cases: when the CPU usage is close to the limit of the host (OS stats section indicates that you are very far from there) or when the CPU is a % of DB time - in the latter case, this could mean that you are making too many logical reads due to inefficient plans or analysis too. In any case, this does not apply to you, because 20 percent is not very high a number.

    Other items in the list of the top 5 deserve attention, too - gc buffer busy acquire, gc current block busy, enq: TX - line lock conflict.

    To summarize, your database under a lot of stress - whether it is the legitimate workload, and if this is the case, you may need to upgrade your hardware later. There is chance that it isn't - for example a high number of runs may indicate that rather than to bulk operations database code using PL/SQL loops, which is a big performance killer. Check "Top SQL by executions" about whether or not this is the case.

    Good luck!

    Best regards
    Nikolai

  • long log file sync waits

    Hello

    I am trying to improve the performance of a 10.2.0.5 database who is suffering from the high value of the log file sync wait. AWR reports show that it is almost never less than 20% of the time of database, normally it is 20-30%, and it is consistently above not-idle wait event. Many sessions he takes 80-90% of the time or more.

    Log file parallel write is an order of magnitude lower, probably isn't an I/O problem. The database performs about 100 commits per second, the ratio of user-call-to-commit is about 20, again generated 500 k/s, log buffer is big 14 MB. There are about 6-7 journal file switches per hour on average.

    There are several oddities on log file sync wait here and I'd appreciate any help unravel them:

    1) there are almost two file sync wait events in the log by a posting on average (number of parallel expectations of log file is about the same number of validations). Why?
    (2) according to the ASH, nearly half of log file sync waits take near Ms. 97.7 is something special reason for this pic?
    (3) approximately 0.5% of the log file sync waits captured by ASH see the multisecond wait times. No idea where they may come from or how to diagnose this kind of problem?

    Some parts of an AWR report below, please let me know if anything else is needed.

    Best regards
    Nikolai
    Cache Sizes
~~~~~~~~~~~                       Begin        End
                             ---------- ----------
               Buffer Cache:    44,592M    44,672M  Std Block Size:        16K
           Shared Pool Size:     3,104M     3,024M      Log Buffer:    14,288K

Load Profile
~~~~~~~~~~~~                            Per Second       Per Transaction
                                   ---------------       ---------------
                  Redo size:            545,833.77              6,659.29
              Logical reads:            225,711.23              2,753.73
              Block changes:              1,788.11                 21.82
             Physical reads:              1,195.98                 14.59
            Physical writes:                119.02                  1.45
                 User calls:              2,368.64                 28.90
                     Parses:                737.35                  9.00
                Hard parses:                 94.58                  1.15
                      Sorts:                261.75                  3.19
                     Logons:                  5.93                  0.07
                   Executes:              1,796.12                 21.91
               Transactions:                 81.97

Top 5 Timed Events                                         Avg %Total
~~~~~~~~~~~~~~~~~~                                        wait   Call
Event                                 Waits    Time (s)   (ms)   Time Wait Class
------------------------------ ------------ ----------- ------ ------ ----------
CPU time                                         23,580          19.8           
log file sync                       491,840      21,976     45   18.5     Commit
db file sequential read           1,902,069      12,604      7   10.6   User I/O
read by other session               743,414       4,159      6    3.5   User I/O
log file parallel write             220,772       3,069     14    2.6 System I/O

          -------------------------------------------------------------       

Instance Activity Stats            ******************

Statistic                                     Total     per Second     per Trans
-------------------------------- ------------------ -------------- -------------
Cached Commit SCN referenced                 11,130            3.1           0.0
Commit SCN cached                                 3            0.0           0.0
DB time                                  12,547,531        3,483.3          42.5
DBWR checkpoint buffers written             145,437           40.4           0.5
DBWR checkpoints                                  6            0.0           0.0
...
IMU CR rollbacks                              2,566            0.7           0.0
IMU Flushes                                  36,411           10.1           0.1
IMU Redo allocation size                187,480,124       52,045.3         635.0
IMU commits                                 255,350           70.9           0.9
IMU contention                               11,998            3.3           0.0
IMU ktichg flush                                 11            0.0           0.0
IMU pool not allocated                        4,295            1.2           0.0
IMU recursive-transaction flush                 175            0.1           0.0
IMU undo allocation size              2,029,937,952      563,519.5       6,875.1
IMU- failed to get a private str              4,295            1.2           0.0
...
background checkpoints completed                  6            0.0           0.0
background checkpoints started                    6            0.0           0.0
background timeouts                          11,400            3.2           0.0
...
change write time                             9,398            2.6           0.0
cleanout - number of ktugct call             54,233           15.1           0.2
cleanouts and rollbacks - consis              9,436            2.6           0.0
cleanouts only - consistent read              2,028            0.6           0.0
...

Instance Activity Stats            *******************

Statistic                                     Total     per Second     per Trans
-------------------------------- ------------------ -------------- -------------
commit batch performed                           61            0.0           0.0
commit batch requested                           61            0.0           0.0
commit batch/immediate performed                 94            0.0           0.0
commit batch/immediate requested                 94            0.0           0.0
commit cleanout failures: block                  51            0.0           0.0
commit cleanout failures: buffer                 14            0.0           0.0
commit cleanout failures: callba              8,632            2.4           0.0
commit cleanout failures: cannot             10,575            2.9           0.0
commit cleanouts                            991,186          275.2           3.4
commit cleanouts successfully co            971,914          269.8           3.3
commit immediate performed                       33            0.0           0.0
commit immediate requested                       33            0.0           0.0
commit txn count during cleanout             61,737           17.1           0.2
...
redo blocks written                       4,078,889        1,132.3          13.8
redo buffer allocation retries                  177            0.1           0.0
redo entries                              1,924,106          534.1           6.5
redo log space requests                         174            0.1           0.0
redo log space wait time                      2,333            0.7           0.0
redo ordering marks                           4,553            1.3           0.0
redo size                             1,966,229,700      545,833.8       6,659.3
redo subscn max counts                       38,227           10.6           0.1
redo synch time                           2,233,166          619.9           7.6
redo synch writes                           352,935           98.0           1.2
redo wastage                             56,259,980       15,618.0         190.5
redo write time                             316,495           87.9           1.1
redo writer latching time                        19            0.0           0.0
redo writes                                 220,866           61.3           0.8
rollback changes - undo records                 134            0.0           0.0
rollbacks only - consistent read             11,242            3.1           0.0
...

...
transaction rollbacks                            94            0.0           0.0
transaction tables consistent re                 25            0.0           0.0
transaction tables consistent re              8,704            2.4           0.0
undo change vector size               1,176,156,772      326,506.2       3,983.5
user I/O wait time                        2,039,881          566.3           6.9
user calls                                8,532,422        2,368.6          28.9
user commits                                295,139           81.9           1.0
user rollbacks                                  122            0.0           0.0
...
          -------------------------------------------------------------      

    High "log file synchronization" waits arise also when LGWR is unable to get the CPU to republish on the boy that the log write is complete. The boy expected this event until LGWR may be a sign but if LGWR is unable to get the CPU, it is unable to signal quite quickly.

    8 processors for 1 hour is 28 800 seconds. 7 UC is an odd number. This is equivalent to 25 200 seconds available. Your AWR shows that Oracle has represented time seconds 23 580 CPU. So, your server is probably encounter situations where processes are unable to get the CPU.

    You can pin or renice LGWR - but you need to check with Oracle Support if this is doable on your platform or supported.

    What you need to do is to adjust the sessions that make very high logical reads (a simple rule is 10 k blocks per CPU per second and you hit 225 K blocks for 7 processors!) to reduce the logical reads and CPU consumption.
    OR add more CPU.

    Hemant K Collette
    http://hemantoracledba.blogspot.com

    Hemant K Collette

  • Full log files are available to LGWR for reuse

    Hello

    Oracle version:
    Oracle Database 10g Release 10.2.0.4.0-
    OS: Windows XP

    In oracle, documentation, noted that:

    Filled log files are available to LGWR for re-use if archiving is enabled.

    * > If archiving is disabled (the database is in NOARCHIVELOG mode), a full redo log file is available after changes in it have been written to the data files *.


    Link for Documentation is:
    http://docs.Oracle.com/CD/B28359_01/server.111/b28310/onlineredo001.htm
    My doubt is:
    Redo records are written in files of data also?

    user12141893 wrote:
    This means:
    Suppose that:
    Files redo log Online contains some redo entries and cache buffers data base contains data and these data belong to redo entries to the redo log files.
    Now this redo log file cannot be reused until the (related) blocks of the database buffer cache are written to the data files.

    It's sort of OK. If the log file should be filled, LGWR could switch to the next group of newspapers and would launch a Log Switch that would also trigger DBWR to launch the script of checking the content protected by this newspaper group in the data file. At the time, this operation would go, newspapers group members would have the status of assets , and once it is complete, the State would be marked inactive , which means that this group of newspapers and its members may be reused by LGWR.

    HTH
    Aman...

  • Deleted alerts log file

    What happens if alert log file is deleted?

    What happens if alert log file is deleted?

    It will be recreated again. See below

    sys@11GDEMO > show parameter background

    VALUE OF TYPE NAME
    ------------------------------------ ----------- ------------------------------
    background_core_dump partial string
    / oracle/11 g/diag/rdbms/11gdemo string background_dump_dest
    + / 11gdemo / trace +.
    sys@11GDEMO >! ls - ltr/oracle 11 g/diag/rdbms/11gdemo/11gdemo/trace/al *.
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    sys@11GDEMO >! RM /oracle/11g/diag/rdbms/11gdemo/11gdemo/trace/alert_11gdemo.log

    sys@11GDEMO >! ls /oracle/11g/diag/rdbms/11gdemo/11gdemo/trace/alert_11gdemo.log
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    sys@11GDEMO > alter system switch logfile;

    Modified system.

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  • Size of the log file Archive

    Redlogfile size is 16 MB and generating the archivelog file size is approximately 10 Mb. what could be the reason?

    Oracle Version: 10.2.0.4

    OS: Windows

    Published by: Deccan charger 19 April 2010 23:31

    First of all:

    a redo log contains a lot of things necessary for instance etc. recovery an archived log is used only for the restorations - he didn't need all the stuff that is in a redo log, so when written CRA the archiving log that he does not write all knowledge, all that is required for restores

    Second:

    Archive logs is created with dimensions smaller, irregular, as the original redo logs. Why? [388627.1 ID]

    --------------------------------------------------------------------------------

    Last updated 2 June 2007 Type status MODERATE HOWTO

    In this Document
    Goal
    Solution
    References

    --------------------------------------------------------------------------------

    This document is available to you through process of rapid visibility (RaV) of the Oracle's Support and therefore was not subject to an independent technical review.

    Applies to:
    Oracle Server - Enterprise Edition - Version: 8.1.7.4 to 11.1
    Information in this document applies to any platform.

    Goal
    Archive logs is created with dimensions smaller, irregular, as the original redo logs.
    Commands like:
    ALTER SYSTEM SWITCH LOGFILE
    or
    ALTER SYSTEM ARCHIVE LOG...
    are not used to generate archives or change the log file. Thus, there is no parameter ARCHIVE_LAG_TARGET set.
    What else could cause this behaviour?
    Solution
    From:
    Bug: 5450861: NEWSPAPERS ARCHIVE IS GENERATED with one SIZE SMALLER THAN THE REDO LOG FILES
    the explanation of this situation has 2 main reasons:
    1 archiving logs do not have to be in the same size. This was decided very long ago, when blank padding archiving logs stopped for a very good reason - in order to save disk space.

    2. the log command does not exist when a redo log file is 100% full. There is an internal algorithm that determines when to switch journal. It also has a very good reason - do the command of newspaper at the last moment may incur performance problems (for various reasons, outside the scope of this note).
    So, after that newspaper ordering occurs the archivers are only copying the information from the redo log files. As recovery logs are not 100% full after the command to log and archive logs are empty not filled after the copy operation is complete, this results in unequal files smaller than the original of redo log files.
    This is very apparent for very low (less than 10 MB) log files; as a result, produced 2.5 MB archive logs of 5 MB recovery logs are very visible.
    Just note that currently, the default log files are 100 MB in size. If the archives log files would be between 98 and 100 MB person would notice.
    The main concern that one must have for newspapers of archives files is a possible corruption. This can be easily verified by attempting a resumption of testing. When it's ok, the size of the log archive uneven should be of no interest, as is expected.

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