Commit Completes Although Current Online Redo Log File Have Been Removed
Apr 10, 2013
Although i have removed current online redo log file in linux os (Oracle Linux),when i type "commit" it says that "commit complete".
Is this fair for this princip?*:" if Only when all redo records associated with a given transaction are safely on disk in the online logs is the user process notified that the transaction has been committed."*
I think that it can lead to loss of data in some cases..I'm using Oracle 11g R2 on OEL (x64)..
P.S : I haven't multiplexed current ORL group files...
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Sep 25, 2013
Version: 11.2.0.3Platform : Solaris 10
One of the Hitachi support guy has suggested to create a separate disk group for Online redo logs. His rationale was that ORLs was write only files and it would be better to put in a separate disk group.
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Sep 13, 2011
I've only successfully duplicate a standby database.
from the alert log
ORA-00313: open failed for members of log group 1 of thread 1
ORA-00312: online log 1 thread 1: 'D:ORA102CTAREDO01.LOG'
ORA-27041: unable to open file
OSD-04002: unable to open file
O/S-Error: (OS 2) The system cannot find the file specified.
[code].....
when I tried to add the online and standby redo log, it error out
SYS@CTA>select logdetail.member, loggroup.group#, loggroup.sequence#, loggroup.archived, loggroup.status lg_status, logdetail.status ld_detail, logdetail.type
2 from v$log loggroup join v$logfile logdetail
3 on loggroup.group# = logdetail.group#;
MEMBER
--------------------------------------------------------------------------------
GROUP# SEQUENCE# ARC LG_STATUS LD_DETA TYPE
---------- ---------- --- ---------------- ------- -------
[code].....
based on my understanding from [URL] ....
Quote:
As part of the duplicating operation, RMAN automates the following steps:
Creates a control file for the duplicate database
Restores the target datafiles to the duplicate database and performs incomplete recovery by using all available incremental backups and archived redo logs
Shuts down and starts the auxiliary instance (refer to "Task 4: Start the Auxiliary Instance" for issues relating to client-side versus server-side initialization parameter files)
Opens the duplicate database with the RESETLOGS option after incomplete recovery to create the online redo logs (except when running DUPLICATE ... FOR STANDBY, in which case RMAN does not open the database) when duplicating for standby database it does not create online redo logs. Duplicating a standby database does not creates online redo logs.
how should I add the online and standby redo logs. If I transfer the redo logs from primary to standby, it always encountered the the following error
Dump file d:ora102ctadumpcta_arc0_3624.trc
Tue Sep 13 19:21:53 2011
ORACLE V10.2.0.4.0 - Production vsnsta=0
vsnsql=14 vsnxtr=3
Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - Production
With the OLAP, Data Mining and Real Application Testing options
Windows XP Version V5.1 Service Pack 2
[code].....
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Jan 14, 2013
How do we check current redologs are sized properly.if there is any script to check that.
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Jun 8, 2012
We have one primary oracle database 10.2 and standby by database with no data guard. Initially we have 2 redo log group in primary and standby database.
We have recently add 2 more redo log and increase the size of log member from 50m to 200m in primary database. We don't have any problem in primary database.but in standby database we face a problem because we cannot open it. It always in mount stage in which . How we change the size of current redo log because we can't run. Alter system switch logfile command in mount stage.
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May 21, 2013
Is there any way of returning output parameter values to calling environment before completion of procedure execution. I may achieve it by using GTTs, looking for any other way (because calling environment again need to issue select statement to retrieve data from GTT).
Example case:
Procedure have multiple ref cursors as out parameters.
....
...
if exp1=exp2
then
open v_ref_var1 for select ...from ... ;
end;
[code]..........
If the first if condition satisfies, ref cursor - v_ref_var1 data should be immediately available for the calling environment.
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Oct 1, 2011
what exactly redo log file contains.? whether they contained the ddl or dml statements or more than that.........?
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Apr 6, 2011
The REDO log file size is important DB performance issues when DB is run archivelog mode.If DB run noarchivelog mode, REDO log file size not impact to DB performance.
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Aug 20, 2010
redo generation. As I found the below statement in another forum."Undo segment generates the redo data also, because undo segment is database changes, so it generates the redo data also."
How a Undo segment can generate Redo and Undo datas.
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Aug 31, 2012
I have a standalone DB of version 10.2.04.I am facing log file parallel write as one of the top events.I have increased the REDO log file size to 500m.But even then REDO switching is happening frequently.
select group#, bytes, archived, status, first_change#, first_time from v$log order BY first_change#;
GROUP# BYTES ARC STATUS FIRST_CHANGE# FIRST_TIME
---------- ---------- --- ---------------- ------------- ----------
10 262144000 NO INACTIVE 8509999 30-08-2012
12 524288000 NO INACTIVE 8612142 30-08-2012
11 262144000 NO INACTIVE 8676390 30-08-2012
9 262144000 NO CURRENT 8706330 30-08-2012
[code]....
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Feb 10, 2011
I would like to make a change on the live system!I have read a book and found a information about REDO log file size is impact on DB performance.My DB current log file size is 100 MB. But, Oracle 10g's Redo Logfile Sizing Advisor offer the optimal log file size is 1845 MB.What REDO log file size is best for my Oracle database?
#Optimal log file size:
select optimal_logfile_size
from v$instance_recovery
----------------------------
OPTIMAL_LOGFILE_SIZE
1842
[code]....
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Feb 25, 2011
I try to current redo log file location to multiplex redo log configuration. I did do this on the DB.I import a backup file to DB when I made this change, but its too slow running import process from old configuration. Approximately it is 4 times slow.
when I recovery old configuration for redo log file, import process is normal running...Why this changes hit to DB import process performance? The old redo log file location is below:
GROUP#MEMBERBYTES
4"/crtest1/oradata/redo04a.log"524288000
4"/crtest1/oradata/redo04b.log"524288000
3"/crtest1/oradata/redo03a.log"524288000
3"/crtest1/oradata/redo03b.log"524288000
2"/crtest1/oradata/redo02a.log"524288000
2"/crtest1/oradata/redo02b.log"524288000
1"/crtest1/oradata/redo01a.log"524288000
1"/crtest1/oradata/redo01b.log"524288000
The new multiplex redo log file location is below:
GROUP#MEMBERBYTES
4"/crtest1/oradata/redo04a.log"524288000
4"/opt/redolog/redo04b.log"524288000
3"/opt/redolog/redo03a.log"524288000
3"/usr/redolog/redo03b.log"524288000
2"/usr/redolog/redo02a.log"524288000
2"/disk1/redolog/redo02b.log"524288000
1"/disk1/redolog/redo01a.log"524288000
1"/crtest1/oradata/redo01b.log"524288000
I think that new configuration is better for old configuration at security issue.Here is the disk partitions on the server:
-bash-3.00$ df -lh
Filesystem size used avail capacity Mounted on
/dev/dsk/c0t0d0s0 9.6G 2.2G 7.3G 23% /
/devices 0K 0K 0K 0% /devices
ctfs 0K 0K 0K 0% /system/contract
[code]....
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Mar 6, 2012
select
a.empno,a.ename,a.job,
B.DNAME
from scott.emp a,scott.dept b
where ( a.ename like 'S%' and a.deptno=b.deptno)
union
select
a.empno,a.ename,a.job,
'aaa' AS DNAME
from scott.emp a,scott.dept b
where ( a.ename like 'S%' and a.job not like 'SALES%');
Output:
7369SMITHCLERKRESEARCH
7369SMITHCLERKaaa
7788SCOTTANALYSTRESEARCH
7788SCOTTANALYSTaaa
Quote:There is other way to improve the query so that UNION can be removed.
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Mar 29, 2011
I've got a legacy SAP system with oracle 8i on Tru64. No changes at all are made but for legal reasons we have to keep it up and running.
we currently do a full backup monthly by shutting down oracle and doing a backup of all the files to tape and that takes around 12 hours.
If I stop doing the full backup and I only backup the control file and the archived redo log files every month and I had to restore the full database years from now, would I be able to restore the database using the last full monthly backup and use the latest control file and archived redo log files?
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Oct 30, 2007
10.2 Oracle database on Linux
Someone(a non DBA) removed the only sysaux datafile from the server using the rm command Obviously, the DB is still up and none of the schemas in the database have their objects right now.
This is not a critical database as you can see when I say that I have NO backup whatsoever. Even though I have the option of deleting and recreating the database, i want to know if I can avoid doing that.
Creating a file on the server with the same name OR creating a new datafile for the tablespace OR recreate the sysaux tablespace ?But how to do any of these? What else should be done ?
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Jul 31, 2012
So, we had multiple set ups of primary database in our local data center, standby in remote location.
We're in the process of shutting down our remote location and have shut down our standbys gracefully, i.e., shutdown managed standby mode, removed archive_log_dest, changed archive_log_dest_state, etc. However, in some primary databases, I'm seeing a weird entry in the alert log:
Changing destination 2 from remote to local during archival of log#: 2 sequence#: 48708 thread#: 1
If I check my local destination, the archive log is created fine. In the remote location, no archives are being created.
Oracle version is 11.1.0.7
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May 30, 2012
What is the difference between the following . In my schema all are giving the same results with some different format
SQL> SELECT sysdate , current_date , current_timestamp , localtimestamp from dual;
SYSDATE CURRENT_DATE CURRENT_TIMESTAMP LOCALTIMESTAMP
----------- ------------ ------------------------------------------------- -------------------------------------------------
5/30/2012 8 5/30/2012 8: 30-MAY-12 08.27.22.037703 AM -04:00 30-MAY-12 08.27.22.037703 AM
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Sep 22, 2010
I need to verify if the current date is grater than the 15th of the current month. If its grater than the 15th of the current month i need to do an action or if else its lesser than 15th of the current month i need to do an other operation.
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Nov 2, 2010
I delete member logfile from disk with statement: shred -fu /u01/app/oracle/redologs/activeredolog/DB1/redo0102.log
But if I check status one logfile with statement:
select status from v$logfile wheremember='/u01/app/oracle/redologs/activeredolog/DB1/redo0102.log';
Status is still null. I think status should be change.
My database is 11.2.0.1 with single instance.
Status is changed after restart instance.
Haw can I monitor status logfiles without restart instance?
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Jan 24, 2013
Including order number, name and contact details (email, address, telephones) of customer and date the order was placed, order including product code, quantity ordered and cost charged; and Data on each product in the catalog including product code, name, description, unit price and category.
user to input information n number of order items (where 1 ≤ n ≤ 20) as parameters
a cursor to handle the multiple orders retrieved.
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Dec 8, 2011
how to connect oracle database through online
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Dec 17, 2012
I am going for a presentation at my University. But the students are not very interested in Oracle or Databases. So I need a title for the Apex topic which gets the other students to visit my presentation.
The presentation should show the basics of apex and how to earn money with this.I thought of:
1) Oracle in the world of Web 2.0
2) How to get online with Oracle
3) What to show if some1 tells you Access is a Database
4) Oracle in a drag and drop environment even for developers
5) Best of Breed: Oracle SQL / PL/SQL, HTML, XML and Java in a nutshell
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Dec 24, 2012
Is it possible to gather stats for a schema which its in use. When i try to analyze the tables of a schema it shows that the statistics for that table is locked. So is it possible that instead of analyzing a table one by one , can i go for gathering the Schema stats while the objects of that Schema is still in use ( like DML or select statements being issued on those schema objects) .
DB version : 10.2.0.4
OS version : RHEL 5.8
DB type : RAC
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Oct 10, 2012
I developed an Point of sales software using developer 6i and database 10g XE.Now I want to use this software online. Can I do it ? If it is, then how?
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Dec 5, 2012
I have implemented Rac One node with two machine(dbtest01,dbtest02) in 11.2.0.3 Redhat 5.3 one for online another one for offline. i have created TAF also.
dbtest01 is online and create one query
DECLARE
i number(36):=1;
begin
while(i<10000000)
loop
dbms_output.put_line(i);
i:=i+1;
end loop;
end;
i executed above query for test and i made relocate database using srvctl utility to dbtest02 machine.
session is relocated successfully with new session id...above query getting stop in 25000 itself. i want to make it continue that process..also i tried to find Omotion utility in all the path.. couldn't find it... where will it be.. i want to relocate all the session without losing work.
from application i am getting disconnect after relocation.. application server need to restart to get work again...
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May 26, 2010
Just want to confirm if I can run the export (command line) even if the database is up (online)? Are there any risks/impact while doing so?
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Dec 1, 2011
I am using SQL developer 2.1 to migrate tables from Sybase 12 database to oracle 11g. I have used online data move option for moving sybase data into oracle tables, but even after data move is completed not all rows have been moved from sybase tables to corresponding oracle tables. Some rows are missing but still there is no error message being displayed, how to find out what's going wrong.
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Jul 20, 2011
Till now i was pretty sure that standby redologs are applied to database without any delay, but everything looks that the process is different. i did on primary server table and add some records to this table.
Next i switch to standby and open redologs (with hex editor) to look for this "create table" and "insert" commands. and i succeeded. so this is prove that standby log are supplied by primary database.
Next i cancelled recovery process and open database in read only mode and there was no records in this standby db, moreover there wasn't any table on standby. so i started to be confused, because i suspected that this table and it content will be on standby database.
Next i started recover process again for standby database and do some switch log on primary server. after that i back to standby, cancel recovery process and open database in read only mode. there was table and contents for it.
so my question is:
does standby redologs should be applied online to database or they are only applied after promoting standby database to primary database?
it looks like contents only from archivelog is applied to standby database. it is correct?
database is 9i.
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Dec 23, 2011
How can i create an oline back up of database using RMAN?
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Aug 8, 2011
Is it possible to change the datatype of a column in a table online, using DBMS_REDEFINITION?
If Yes, then which of the options will be used with DBMS_REDEFINITION package?
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