Advice on SQL Logs and Backups

Hi All,
I've been trying to understand SQL backups and I'm getting a bit stuck in one area - the log files.
I find they're getting quite big and as such filling up my drives. I'm guessing that the best way to handle this is to truncate them every so often - as the data is in the live DB I'm assuming that the log files should be small.
Q1 - I do daily full backups on my DB's via a maintenance plan so is it safe to say that the log files can be truncated daily?
Q2 - How do I go about truncating the logs? I tried a backup of them but I'm not sure what to do next.
Thanks for any help.
Tom

This can cause fragmentation and performance issues. Truncating the log is what happens when you take a backup.
Prashanth,
Shrinking log file does not causes fragmentation ( if you shrink data file it does cause) but your are correct that Shrinking log fiel should not be made every day practice.After shrinking when log file tries to grow it has to ask OS to allocate it space
which if done frequently ( on slower disk) can cause performance issue.
Tom,
>>I do daily full backups on my DB's via a maintenance plan so is it safe to say that the log files can be truncated daily?
A:NO only transaction log truncates log file ( or marks it reusable).So you have to take transaction log backup frequently( hope your DB is in full recovery).If your DB is in simple recovery automatic truncation happens and SQL server takes care of it after
checkpoint or when log grows 70 % of it size.
>>Q2 - How do I go about truncating the logs? I tried a backup of them but I'm not sure what to do next.
Again answer is simple take transaction log backup frequently or according to your RPO and RTO
PS: Sometimes when there is long running transaction like huge delete operation,index rebuild of huge database log might grow even frequent transaction log backup is there this is by design because unless transaction finishes or commits logs cannot be truncated
so if you face it look for open transaction and wait for it to commit.
Hope this helps
Please mark this reply as the answer or vote as helpful, as appropriate, to make it useful for other readers

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<#####################################################################
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PS K:\MyScripts\powershell> . 'C:\Users\scj0025\AppData\Local\Temp\Untitled30.ps1'
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# 13 Symbolic link included in patch
# 14 NOT USED
# 15 The prepatch script had a return code other than 0.
# 16 The postpatch script had a return code other than 0.
# 17 Mismatch of the -d option between a previous patch
# install and the current one.
# 18 Not enough space in the file systems that are targets
# of the patch.
# 19 $SOFTINFO/INST_RELEASE file not found
# 20 A direct instance patch was required but not found
# 21 The required patches have not been installed on the manager
# 22 A progressive instance patch was required but not found
# 23 A restricted patch is already applied to the package
# 24 An incompatible patch is applied
# 25 A required patch is not applied
# 26 The user specified backout data can't be found
# 27 The relative directory supplied can't be found
# 28 A pkginfo file is corrupt or missing
# 29 Bad patch ID format
# 30 Dryrun failure(s)
# 31 Path given for -C option is invalid
# 32 Must be running Solaris 2.6 or greater
# 33 Bad formatted patch file or patch file not found
# 34 The appropriate kernel jumbo patch needs to be installed
Back up your system before adding any patches (ufsdump). It's recommended that these patches are added in run level one.
There should be a script called something like "install_cluster" command in the 8_Recommended directory that you can use to add the patches.
By default the patches create backout info in /var, but I usually disable this (yeah, livin' on the edge) with the "-nosave" option.

Full backup and backup archive logs

Hello,
today in the early morning i did backup of my db with :
RMAN> backup as COMPRESSED BACKUPSET DATABASE format '/backup/%d_t%t_s%s_p%p';This command created two files :
[oracle@p1 backup]$ ls -l
total 1132680
-rw-r----- 1 oracle oinstall 1155940352 Sep 14 00:44 TEST_t697508918_s5_p1
-rw-r----- 1 oracle oinstall    2785280 Sep 14 00:44 TEST_t697509873_s6_p1Did i backed up archive logs also with this command ?
If I did not, do i have to i n order to have everything to do complete resterer and recovery ?
Is now to late to backup them?

Can you confirm that this backup will be placed in the FRA, it will backup all datafile, control files, spfile and control files all arhchivle logs and when backup finshes then will delete all archive logs ?+
after running that command yo can confirm it by yourself at RMAN prompt.
RMAN> list backup;
List of Backup Sets
===================
BS Key Type LV Size       Device Type Elapsed Time Completion Time
200     Full    509.78M    DISK        00:01:03     15-FEB-07
        BP Key: 202   Status: AVAILABLE Compressed: NO Tag: TAG20070215T171219
        Piece Name: /disk2/PROD/backupset/2007_02_15/o1_mf_nnndf_TAG20070215T171219_2xb17nbb_.bkp
List of Datafiles in backup set 200
File LV Type Ckp SCN    Ckp Time Name
1       Full 421946     15-FEB-07 /disk1/oradata/prod/system01.dbf
2       Full 421946     15-FEB-07 /disk1/oradata/prod/sysaux01.dbf
3       Full 421946     15-FEB-07 /disk1/oradata/prod/undotbs01.dbf
4       Full 421946     15-FEB-07 /disk1/oradata/prod/cwmlite01.dbf
5       Full 421946     15-FEB-07 /disk1/oradata/prod/drsys01.dbf
6       Full 421946     15-FEB-07 /disk1/oradata/prod/example01.dbf
7       Full 421946     15-FEB-07 /disk1/oradata/prod/indx01.dbf
8       Full 421946     15-FEB-07 /disk1/oradata/prod/tools01.dbf
9       Full 421946     15-FEB-07 /disk1/oradata/prod/users01.dbf
BS Key Type LV Size       Device Type Elapsed Time Completion Time
201     Full    7.98M      DISK        00:00:03     15-FEB-07
        BP Key: 203   Status: AVAILABLE Compressed: NO Tag: TAG20070215T171219
        Piece Name: /disk2/PROD/backupset/2007_02_15/o1_mf_ncsnf_TAG20070215T171219_2xb19prg_.bkp
SPFILE Included: Modification time: 15-FEB-07
SPFILE db_unique_name: PROD
Control File Included: Ckp SCN: 421968       Ckp time: 15-FEB-07
BS Key Size       Device Type Elapsed Time Completion Time
227     30.50M     SBT_TAPE    00:00:11     15-FEB-07
        BP Key: 230   Status: AVAILABLE Compressed: NO Tag: TAG20070215T171334
        Handle: 0bia4rtv_1_1   Media:
List of Archived Logs in backup set 227
Thrd Seq     Low SCN    Low Time Next SCN   Next Time
1    5       389156     15-FEB-07 411006     15-FEB-07
1    6       411006     15-FEB-07 412972     15-FEB-07
1    7       412972     15-FEB-07 417086     15-FEB-07
1    8       417086     15-FEB-07 417114     15-FEB-07
1    9       417114     15-FEB-07 417853     15-FEB-07
1    10      417853     15-FEB-07 421698     15-FEB-07
1    11      421698     15-FEB-07 421988     15-FEB-07list backup will show you everything.
Would then this be incremental level 0 backup ?
yes by default i think so.
so with this i must be able to flasback my database at least 3 day in the past if i understood correctly.
But i am little puzled about purging those flasback data ...
Can you point me please to some link or tell how can i purge logs that are not need for that flashback period... ?
please read this link
http://download.oracle.com/docs/cd/B19306_01/backup.102/b14192/rpfbdb003.htm#sthref513
Khurram

Exchange Logs Delete and Backup Successfull

kindly clarify the given information :we have 2 mailbox servers in DAG environment but both do not having same numbers of Logs ( let say MBX01 has 3000 logs and MBX02 has 1400 Logs ) so in this case NetBackup will not take successful backup or Logs will
not truncate/Delete. Our MBX01 having true copy.
Thanks in advance !!
Best Regards, Hussain

Hi Hussain,
Base on my knowledge, the numbers of the logs will not effect the backup.
In addition, I also recommend you post this in netbackup forum, as this is a 3rd party backup software, Microsoft does not provide support for it.
Best regards,
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