Reducing Archive Log Retention?
Nov 26, 2012
After much tedious mucking about in hyperspace, I'm back to tweaking my dataguard environment. I'm generating a lot of stored archive logs, this is causing problems with the backups, (since they live on the same drive, /u01 and also contain backups of the logs) I could move the logs onto /u02 but that's not dealing with the problem IMO.
This is the init script for the primary, (prod)
CODE
archive_lag_target=0
audit_file_dest='/u02/oradata/prod/dump/audit'
compatible='10.2.0'
[Code]....
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Mar 13, 2011
The undo_retention is used for read consistency, to avoid snapshot too old.Flashback database is using files in the db_recovery_file_dest.But whether undo_retention has any influence on Flashback drop; Flashback table or Flashback query?Let's say we have set undo_retention = 3600 = 1 hour.And
db_flashback_retention_target = 1440 = 24 hours.
Will it work Flashback drop; Flashback table; Flashback query to get 12 hours back?Additional question. Why Oracle sets undo_retention in seconds and db_flashback_retention_target in minutes?To use the same measure would be more user-friendly to DBAs .
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Jan 24, 2012
we have a tablespace of size 900 GB where 90% of space is occupied by two tables having BLOB data and now i need to drop these two tables and then to recover the space, i need to resize the tablespace (datafiles).
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Nov 3, 2011
In the below SQL, I am calling a function "listagg_nm(deptno)", and function is to get all the employee name for a particular department with comma separated
output is:
-------------------------------------------------
DEPTNO SAL LISTAGG_NM(DEPTNO)
10 5000 KING,CLARK,MILLER
10 1300 KING,CLARK,MILLER
10 2450 KING,CLARK,MILLER
20 2975 JONES,SCOTT,FORD,SMITH,ADAMS
[code]....
below are the code
select deptno,sal,listagg_nm(deptno) from emp order by deptno;
FUNCTION listagg_nm (p_deptno NUMBER)
RETURN CLOB
IS
v_str CLOB;
[code]....
My doubt/question is for every row in the SQL the function is being called. t means that for 1st row deptno=10, the function is called and return all concatenated name for department 10, then again for 2nd row deptno=10, it again do the same, similarly for all other department.
Can we avoid this, I mean, if function is already returned a concatenated string of ename for deptno=10, then in the next function call it will checks if it is for same department (i.e. deptno=10) then the function will not go into for loop and it will directly return the concatenated string of ename for deptno=10 which we already done for the first row and so on for other department number ( something like storing the value in variable. Is it possible to achive this and does this is good for performance as we are not going into loop inside the function to return the concatenated string of ename for the same deptno everytime ( I have to return more than 10000 char., so i used clob in function and similarly the numbers of row return by SQL is more than 1000)and also how to code this, I tried but unable to achive.
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Oct 4, 2010
I'm running Oracle 9i on AIX 5.2. I'm not using a recovery catalog, nor am I using media management software. I perform a full, online rman backup of the database and archived redo logs daily to disk, then use operating system commands to copy the backup to tape. There is only space on disk for two days' backups, so I need to have a retention policy of "redundancy = 1", and run a "delete obsolete" prior to the backup. The problem is that I don't want to subject the archived redo logs to this retention policy.
I have two physical standby databases connected by WAN to the primary site, and I might need archived redo logs that are a few days (or more) old in the event of a prolonged WAN outage. I've read about the "keep forever" option, but apparently it isn't available without using a recovery catalog. Is there any way to spare the archived redo logs from my retention policy?
Note: I want to "protect" the actual archived redo logs from the retention policy, not the backups of the archived redo logs.
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Nov 7, 2013
How we can use RMAN backup to restore oracle database when the RMAN backup pushed to tape already and being a OLD backup ( before retention policy date).Just to elaborate a more.. Say my retention policy is 3 days. I want to restore from a old backup like 30 days old.So surely the requesting backup is behind retention date and has been pushed to tape.
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Apr 22, 2013
I have got the following error yesterday
ORA-01555 caused by SQL statement below (SQL ID: fdxcyoin67ty8t, Query Duration=380128 sec, SCN: 0x0229.ff00afd0):
following are the existing settings
SQL> show parameter undo
NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
undo_management string AUTO
undo_retention integer 96000
undo_tablespace string undo
[code]....
following are the details from v$undostat
select begin_time, end_time, undotsn, undoblks, maxquerylen, maxqueryid, activeblks, unexpiredblks, expiredblks, tuned_undoretention from v$undostat
where trunc(begin_time)=trunc(sysdate)-1 order by begin_time;
BEGIN_TIME END_TIME UNDOTSN UNDOBLKS MAXQUERYLEN MAXQUERYID ACTIVEBLKS UNEXPIREDBLKS EXPIREDBLKS TUNED_UNDORETENTION
-------------- -------------- ---------- ---------- ----------- ------------- ---------- ------------- ----------- -------------------
21-04-13 00:08 21-04-13 00:18 1 12733 378446 duqnawh32hp4u 91152 7068448 225440 345600
21-04-13 00:18 21-04-13 00:28 1 8951 379047 duqnawh32hp4u 99344 7072800 225440 345600
21-04-13 00:28 21-04-13 00:38 1 14073 379650 duqnawh32hp4u 90128 7075872 234656 345600
[code]....
Following are the details in AWR report (00:00 til 01:00 of 21-Apr-2013) .... not thet the error was produced at 00:42
Undo Segment Summary DB/Inst: DBCPY/dbcpy01 Snaps: 18853-18854
-> Min/Max TR (mins) - Min and Max Tuned Retention (minutes)
-> STO - Snapshot Too Old count, OOS - Out of Space count
-> Undo segment block stats:
-> uS - unexpired Stolen, your - unexpired Released, uU - unexpired reUsed
[code]....
Undo Advisor information taken 'now' is as following
SQL> select dbms_undo_adv.longest_query(sysdate-2,sysdate) from dual;
DBMS_UNDO_ADV.LONGEST_QUERY(SYSDATE-2,SYSDATE)
----------------------------------------------
379650
SQL> select dbms_undo_adv.required_retention from dual;
[code]....
In above situation what should be my first choice (assuming increasing space is not an issue) - increase undo tablespace or increase undo retention?
If latter is the choice then what should be the value? Because as I understand present 96000 value is taken as lower limit and because of auto tuning the actual value (TUNED_UNDORETENTION) being used was 345600 In that case shall I set it to something > max(maxquerylen) i.e 379,650 + X?Or I shall increase the undo tablespace size?
From Undo Advisor output it looks to me that even if I increase the undo retention to 379650 current undo size will be able to support it (may be at the expense of DMLs)Is that right?
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Jan 30, 2004
regarding sizing undo tablespace and undo_retention parameter.we have to implement the database in production system with 40 users but how much space should be allocated to undo tablespace is there any propotions related to virtual memory and the
parameter.i have gone thru oracle doc's and some related sites.its an ERP aplications that contains 20 modules .I am an new one to this dba level
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Mar 21, 2012
I am designing the scripts for RMAN backup.
Currently we have 14 days retention policy for daily and weekly backup. but we will have 186days retention for monthly backup, that's mean its should be recoverable around that 3 month (for monthly).
My question is, What should I put the scripts for monthly backup ?
I saw some example its for offline backup:
BACKUP DATABASE UNTIL 'SYSDATE+365' NOLOGS;
But I want the backup should be online ?
Currently our weekly backup like this
#!/bin/bash
# SID= env | grep ORACLE_SID | cut -c12-15
export ORACLE_HOME=/oracle/BWD/112_64
export ORACLE_SID=BWD
LOGFILE=/tmp/BWD-weekly-`date +%y%m%d%H%M`.out
[code].......
And Daily backup:
#!/bin/bash
SID=EPD
export ORACLE_HOME=/oracle/$SID/112_64
export ORACLE_SID=$SID
#LOGFILE=/tmp/EPD-weekly-`date +%y%m%d%H%M`.out
LOGFILE=/tmp/$SID-daily-`date +%y%m%d%H%M`.out
echo>> $LOGFILE
[code]......
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Mar 14, 2013
My DB is in Max Protection mode. In case Standby archive destination gets full & oracle cannot archive standby redo log to standby archive destination, will the primary database shutdown?
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Jun 30, 2010
How after a re-catalog of an archivelog, RMAN knows that the archivelog will be needed and in the right order?
If the re-catalog and subsequent crosscheck has changed the path of the archivelog will RMAN ignore the path and just recognize the archivelog name and format?
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Dec 1, 2010
I am running the following command to backup my archive logs and want to keep at least two hours of .arc files on disk.
rman < connect target login/password
connect catalog login/password
show all;
sql "alter system archive log current";
backup filesperset 5 archivelog until time 'sysdate-2/24'
format $FILE_DEST_ARCH
delete input ;
resync catalog;
EOT
On some occassions, there will not be any archive logs that meet this criteria and I get the following error:
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03002: failure of backup command at 12/01/2010 12:50:58
RMAN-06004: ORACLE error from recovery catalog database: RMAN-20242: specificati
on does not match any archive log in the recovery catalog
Is there anything I can do to the rman command above that will prevent this error from happening but yet keeping same functionality?
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Mar 27, 2013
We are having an intermittent problem related to failing RMAN archive log backups. Normally everything works fine but once every fortnight or so the archive log backup starts to fail with the below message. We run two Oracle instances on this windows box, so they are using same oracle and TSM client binaries, but it is only of the instances that have this problem - the largest instance though. Restarting the Oracle instance solves the problem and everything is back to normal, until next time ...
This is the error message in the rman log file
CODERMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03009: failure of allocate command on c1 channel at 03/27/2013 11:00:29
ORA-03113: end-of-file on communication channel
Alert log contains this
CODEWed Mar 27 11:00:27 2013
Exception [type: ACCESS_VIOLATION, UNABLE_TO_READ] [ADDR:0xFFFFFFFFFFFFFFFF] [PC:0x7716324E, 000000007716324E]
Errors in file R:\ORA_DATA\SDC002\diag\rdbms\sdc002\sdc002\trace\sdc002_ora_12328.trc (incident=523573):
ORA-07445: exception encountered: core dump [PC:0x7716324E] [ACCESS_VIOLATION] [ADDR:0xFFFFFFFFFFFFFFFF] [PC:0x7716324E] [UNABLE_TO_READ] []
Incident details in: R:\ORA_DATA\SDC002\diag\rdbms\sdc002\sdc002\incident\incdir_523573\sdc002_ora_12328_i523573.trc
Trace file
CODE
Trace file R:\ORA_DATA\SDC002\diag\rdbms\sdc002\sdc002\trace\sdc002_ora_12328.trc
Oracle Database 11g Release 11.2.0.3.0 - 64bit Production
Windows NT Version V6.1 Service Pack 1
CPU : 40 - type 8664, 20 Physical Cores
Process Affinity : 0x0x0000000000000000
Memory (Avail/Total): Ph:85656M/147445M, Ph+PgF:96175M/157683M
Instance name: sdc002
Redo thread mounted by this instance: 1
Oracle process number: 57
Windows thread id: 12328, image: ORACLE.EXE (SHAD)
*** 2013-03-27 11:00:27.255
*** SESSION ID:(530.31175) 2013-03-27 11:00:27.255
*** CLIENT ID:() 2013-03-27 11:00:27.255
*** SERVICE NAME:(SYS$USERS) 2013-03-27 11:00:27.255
*** MODULE NAME:(rman.exe) 2013-03-27 11:00:27.255
*** ACTION NAME:(0000001 STARTED1) 2013-03-27 11:00:27.255
Exception [type: ACCESS_VIOLATION, UNABLE_TO_READ] [ADDR:0xFFFFFFFFFFFFFFFF] [PC:0x7716324E, 000000007716324E]
*** 2013-03-27 11:00:27.473
Incident 523573 created, dump file: R:\ORA_DATA\SDC002\diag\rdbms\sdc002\sdc002\incident\incdir_523573\sdc002_ora_12328_i523573.trc
ORA-07445: exception encountered: core dump [PC:0x7716324E] [ACCESS_VIOLATION] [ADDR:0xFFFFFFFFFFFFFFFF] [PC:0x7716324E] [UNABLE_TO_READ] []
I have the incident file as well if that is of any use.
Could the problem be related to running two backups in parallel?
We run full backups once a week and both this time and last time the archive log backup failed it was in conjunction to when the full backup also was running.
Is there any other solution to the problem than restarting the oracle instance?
Since this is a busy production instance it is a big problem for us to restart it outside of maintenance windows.
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Mar 3, 2011
I am using Oracle 11.2.1.0 version.I want to restrict archiving for some tables. I think NOLOGGING will solve this problem. Is there any option for restricting archiving.
For example, I have three tables called A, B and C. I want to archive only 2 tables A and B but not C.
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Mar 16, 2012
We have a table which gets updated on a daily basis. We need to manage the records with the retention period of 30 days and move the remaining records to another table.
I understand that we can use "select insert" statement and then the "delete" statement to achieve this. Is there any sql to directly move the records to another table rather than inserting and then deleting?
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May 2, 2010
I have one requirement saying that " Can we restrict archive logs for some tables".
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Jul 2, 2012
in our database 10.0.2.4 with RAC archive log generated each 4 min , did this increase the performance of database and how i can fix it
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Jun 8, 2012
I am using Oracle Database 10.2 in No Archive Log Mode. what auditing options are available in No Archive Log mode ?
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May 8, 2013
I am unable to find out the location of my archive logs. The VALUE field is null.
SQL> show parameter log_archive_dest;
NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
log_archive_dest string
log_archive_dest_1 string
log_archive_dest_10 string
log_archive_dest_11 string
log_archive_dest_12 string
log_archive_dest_13 string
log_archive_dest_14 string
log_archive_dest_15 string
log_archive_dest_16 string
log_archive_dest_17 string
log_archive_dest_18 string
NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
log_archive_dest_19 string
log_archive_dest_2 string
log_archive_dest_20 string
log_archive_dest_21 string
log_archive_dest_22 string
log_archive_dest_23 stringSQL> archive log list
Database log mode Archive Mode
Automatic archival Enabled
Archive destination USE_DB_RECOVERY_FILE_DEST
Oldest online log sequence 2907
Next log sequence to archive 2908
Current log sequence 2909
When I do SQL>show parameter USE_DB_RECOVERY_FILE_DEST,I am not getting any result.
when I do *SQL>show parameter DB_RECOVERY_FILE_DEST, I am getting the result.
NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
db_recovery_file_dest string +BKUP_TSD1
db_recovery_file_dest_size big integer 500GSo +BKUP_TSD1,
is this where my archive logs are present?
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Jul 13, 2013
Database version: 11.2.0.3(Exadata)
We want to use archive compression for our standby(standalone non-exadata). We don't have license for Advanced Compression. Is the archive compression possible without Advanced Compression?
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Feb 13, 2013
We have 100 archive log files out of that 20 archive log file are deleted, We want take full Database backup plus archivelog files using RMAN
Is it possible to take backup without 20 archivelog file using RMAN?
Is it possible to take full database backup with 80 archivelog file using RMAN?
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May 6, 2013
resolving the below issue.
environment:
DB version:11.2.0.3.0
OS : IBM/AIX RISC System/6000
backup tool : Symantec net backup.
When I start RMAN backup through Symantec net backup tool same is failing. when I see in log file below error message is recorded in the same.
################################################################################
Starting backup at 06-MAY-13
channel ch00: starting compressed incremental level 0 datafile backup set
channel ch00: specifying datafile(s) in backup set
RMAN-03009: failure of backup command on ch00 channel at 05/06/2013 07:09:16
[Code]....
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03009: failure of backup command on ch00 channel at 05/06/2013 07:09:16
ORA-19602: cannot backup or copy active file in NOARCHIVELOG mode
RMAN> RMAN>
Recovery Manager complete.
####################################################################################
But, DB is up and operating fine with ARCHIVELOG mode at that movement not even restart also.
how to resolve.
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Aug 27, 2012
I heard about flaskback data archive. can i get some short example to understand in practical way
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Sep 13, 2013
I`m using the the version 11.0.2.3 for testing. I read a line as below from the OCP book.
If none of the LOG_ARCHIVE_DEST_n parameters have been set, then transitioning. the database to archivelog mode will internally set LOG_ARCHIVE_DEST_10 to the flash recovery area, if it has been configured. In my database the fast recovery already been set as below.
SQL> show parameter db_recovery
NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
db_recovery_file_dest string +FASTRECOVERY
db_recovery_file_dest_size big integer 4248M
So I thought if I turn the database into archive log mode, then the log_archive_dest_10 will be set as the same value as db_recovery_dest.
SQL> alter database archivelog;
Database altered.
SQL> alter database open;
Database altered.
SQL> show parameter log_archive_dest
NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
log_archive_dest string
log_archive_dest_1 string
log_archive_dest_10 string
See, after the database become archive, the log_archive_dest_10 still be empty. So is there any thing wrong with my understanding?
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Sep 16, 2010
I am not able to delete one month old archive log file on production database. it already applied on standby database. While deleting the files, it throwing errors as "Another program is using it".
Version:10.2.0.4
OS: Windows server 2003.
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Mar 29, 2013
If the standby archive destination is full, what will happen? Will the standby DB freeze? or will oracle stop redo transport from primary to standby?
DB Version: 11.2.0.2 running on RHEL5
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Nov 9, 2010
I am having a data guard setup done in oracle 10g(10.2.0.4.0) WINDOWS Platform. some of the archive process are locked in primary db side.
PROCESS STATUS LOG_SEQUENCE STAT
-------- ---------- ------------ ----
0 ACTIVE 0 IDLE
1 ACTIVE 804462 IDLE
2 ACTIVE 0 IDLE
3 ACTIVE 0 IDLE
4 ACTIVE 0 IDLE
5 ACTIVE 800011 BUSY
6 ACTIVE 0 IDLE
7 ACTIVE 800009 BUSY
8 ACTIVE 0 IDLE
9 ACTIVE 802335 BUSY
10 ACTIVE 0 IDLE
Shall we kill the locking archive processes? killing archive processes will cause any problem?
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Sep 3, 2010
ORACLE VERSION: 11.2
ENVIRONMENT: physical standby database
MODE: maximum performance mode.
SQL> select * from v$archive_gap;
no rows selected
SQL> select sequence#, applied from v$archived_log where applied='NO';
SEQUENCE# APPLIED
---------- ---------
10929 NO
10930 NO
10931 NO
10932 NO
10933 NO
10934 NO
10935 NO
10936 NO
10937 NO
11073 NO
11074 NO
SEQUENCE# APPLIED
---------- ---------
11075 NO
11076 NO
11077 NO
11078 NO
11079 NO
11080 NO
11081 NO
11082 NO
11083 NO
11084 NO
11085 NO
SEQUENCE# APPLIED
---------- ---------
11086 NO
11087 NO
11088 NO
11089 NO
11091 NO
11092 NO
What would be the cause
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Nov 23, 2010
Questions about implementing ARCHIVELOG mode in RAC environment.
Oracle 11gR1 RAC + ASM database. I'd like to implement ARCHIVELOG mode. Each node will have its own archive log.
Does it make sense to place archivelogs on ASM (shared storage)? Or the best practice would be to have some aside "BACKUP" server to place and keep archivelogs from all the RAC nodes there?
Additional question is about archive logs space required estimation. If it's correct to know estimate archive logs space required to get the daily avg number of switch logs
CODEselect round(avg(n_of_switch_logs), 3) avg_num_of_switch_logs
from (select trunc(first_time), count(*) n_of_switch_logs
from gv$log_history
group by trunc(first_time))
and multiply it on size of single redolog?
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Mar 16, 2012
on weekends we have too many archive logs generated .i have taken the data of a week and found that average archive log generated from monday to friday is 7 files per day but on satuarday and sunday the average is 60 files and FG1 gets full. on weekends we have all type of backups running like incremental,archival and logical backups and on sunday we have full physical backup
what is the reason of too many archive log files generations at weekends. is it due to hot and logical backups , if yes then how ?
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