Server Administration :: Change Current Redo Log Size In Oracle Mount Stage
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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Feb 22, 2013
SQL> update t set a = 1 where b = 2; -- must have redo record
2 rows updated.
SQL> rollback;
the above redo record that uncommit changed must be written from redo buffer to the online redo logfile. why Oracle write the redo record that uncommit changed to the online redo logfile ? when it will be used?
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Feb 26, 2013
1-how can i alter/change the size of tablespaces?.
2-is any changing in tablespace size will effect the over all performance?
Tablespace ; Size (MB); Free (MB); % Free; % Used
------------------------------;----------;----------;----------;----------
USERS ; 5; 4; 80; 20
SYSAUX ; 600; 140.875; 23; 77
UNDOTBS1 ; 640; 114.125; 18; 82
SYSTEM ; 700; 28.3125; 4; 96
TEMP ; 64; 0; 0; 100
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May 21, 2013
I've a situation where I've very less redo logs generated. Let us say 10MB. Which solution will be better ?
1. Create one redo log group about 12 MB in size.
2. Create two redo log groups about 5 MB each in size as recommended by Oracle.
Even though solution 1 is also appropriate for me because I've less redo generated than the redo log group size. My whole redo will fit in this and I can raise checkpoint forcefully after certain period of time let us say every 3 seconds.
In one of our DB I found scenario one is implemented. So I want to know pros and cons of both of these practices.
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Feb 3, 2013
i encoutered lately on such statement:
Table D-7 shows a hierarchical file mapping of a sample OFA-compliant installation with two Oracle home directories and two databases. The database files are distributed across three mount points, /u02, /u03, and /u04. URL....
why three mount points (/u02, /u03, and /u04) for datafiles? don' understant this. isn't it better to store all datafiles in one mountpoint?
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Apr 1, 2009
I want to shutdown the database using shutdown immediate and startup the database using startup mount.
1.)My system is client system if I connect start--> program -->Accessories --> communication --> Remote Desktop connection (connect server system) , open Run type cmd after
Shutdown immediate (database is shutdown)
Startup mount (database is mounted no problem it's working fine)
2.) But if I, open Run type cmd in client system If I run same command, I'm getting below error (ORA-12560: TNS:protocol adapter error).
C:>set oracle_sid=dbadb
C:>sqlplus / as sysdba
SQL*Plus: Release 10.1.0.2.0 - Production on ╘± ╠ß± 31 18:09:27 2009
Copyright (c) 1982, 2004, Oracle. All rights reserved.
ERROR:
ORA-12560: TNS:protocol adapter error
[code].....
3. If I run same command in Sql Plus I'm getting below error(ORA-12514: TNS:listener does not currently know of service requested in connect descriptor).
SQL*Plus: Release 10.1.0.2.0 - Production on Ôñ Ìáñ 31 18:23:13 2009
Copyright (c) 1982, 2004, Oracle. All rights reserved.
Connected to:
Oracle Database 10g Enterprise Edition Release 10.1.0.2.0 - Production
With the Partitioning, OLAP and Data Mining options
[code].....
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May 3, 2011
which commands only we can use in database mount mode?
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May 10, 2002
I performed Shutdown Immediate in Oracle 8I and now I am unable to mount the database.I'm getting the following message: ORA-01102 Cannot mount database in Exclusive mode/I only have one database running on this machine. It was automatically created by Oracle installer upon installation of Oracle software. I can no longer connect via SQL * Plus,Only through Server Manager (connect internal)
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Apr 21, 2010
how can we find the size of the oracle database 11g.
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Mar 27, 2011
I want to know what is the size of each granule for oracle 10g. I read it from the following link
[URL].........
There it is described that
Quote:
The memory for dynamic components in the SGA is allocated in the unit of granules. Granule size is determined by total SGA size. Generally speaking, on most platforms, if the total SGA size is equal to or less than 1 GB, then granule size is 4 MB. For SGAs larger than 1 GB, granule size is 16 MB. Some platform dependencies may arise. For example, on 32-bit Windows NT, the granule size is 8 MB for SGAs larger than 1 GB. Consult your operating system specific documentation for more details.
Now My query about full list of granule size for different platform like windows 64 bit, unix etc.
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Apr 13, 2011
I am using oracle 8.1.5 database and my temp01.dbf file size is increased upto 19.8 GB now i want reduce its size .
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Nov 6, 2008
We are configuring NAS device on linux for RAC installation.
ISSUE: I had mounted NAS device to Linux server.As root user I can create directory but cannot change owner of cifs mount.It say permission denied.When I try to change permission it doesn't work.The mount point show the uid and gid as 33 and permissions drwxr-xr-x
I had mounted using the following command
#mount -t cifs storage:/ocr1 /u02/ocr1 -o username=XXXX,password=XXXX,uid=oracle,gid=dba
Permission denied
[root@SSIPL-WRKST-116 u02]# chown -R oracle:dba ocr1
chown: changing ownership of `ocr1': Permission denied
chown: changing ownership of `ocr1/ss': Permission denied
[root@SSIPL-WRKST-116 u02]#
Change owner
[root@SSIPL-WRKST-116 u02]# ls -lrt
total 0
drwxr-xr-x 3 33 33 0 Dec 4 2006 ocr1
[root@SSIPL-WRKST-116 u02]# chmod -R 777 ocr1
[root@SSIPL-WRKST-116 u02]# ls -lrt
total 0
drwxr-xr-x 3 33 33 0 Dec 4 2006 ocr1
[root@SSIPL-WRKST-116 u02]#
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May 11, 2012
I want to change cursor_sharing, open_cursors and session_cached_cursors parameter values for SPFILE (Only SPFILE) using SQL Query.
I have found following SQL Queries, but I don't know these queries are only for SPFILE or not.
ALTER SESSION SET cursor_sharing='EXACT';
ALTER system set open_cursors=2500;
ALTER SESSION set session_cached_cursors=70;
I need SQL Queries only for SPFILE.
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Aug 15, 2013
How to change Character set for oracle 8i database. Is there anyway to change the Character set without affecting the current database.
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Feb 15, 2013
I am in need to find archive log mount point space detail usage through sqlplus on multiple instance. Is there any view in oracle which can give me the detail.
I know one method using external table but that is cumbersome for RAC.
can i get some command like this.
select inst_id,mountpoint,space_usage,space_available,total from GV$table --> returns
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Jul 26, 2010
I have oracle 9i running on HP-UX, I would like to find how much redo we are generating in a given period of time, is there any script that I can use to get this information?
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May 27, 2011
I learnt that logWriter writes in the redo log files when redo log buffer is 1/3 full, it means that 66 % of redo log buffer are always empty and never used,
if no, isn't a waste of memory (66 % always empty !)
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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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Feb 1, 2011
I have some doubts about redo log files,
1) Can we fetch 'select statements' from redo log files through the use of log miner utility or any other?
(I think redo log file contains only insert,update,delete and DDL/DCL commands only)
2) If "No" to the above answer then how can i fetch all select statements fired on the system for a day or particular time.
(setting of sql_trace may be the one of them, but can it be possible for system level)
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Oct 5, 2012
Today i noticed one problem with my database,my redologs switches in every 3mins,i also noticed there is no more transaction changes happening in database but still redo switches.
Fri Oct 05 06:10:05 2012
Thread 1 advanced to log sequence 79244
Current log# 2 seq# 79244 mem# 0: D:ORADATAORACIREDO02.LOG
Fri Oct 05 06:12:16 2012
Thread 1 advanced to log sequence 79245
Current log# 1 seq# 79245 mem# 0: D:ORADATAORACIREDO01.LOG
Fri Oct 05 06:14:28 2012
[code]......
why redo switch happening,any internal problem causes redo to switch .
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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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Jan 7, 2013
Redo is getting generated very high. how to find out the reason ? database kept under 2 node cluster. chcked alert log trace and log writer trace files. pasted the content as below:
--alert log trace from node1 ( node2 also has same type of message ). Archive destination disk group - TXCOM_BACKUP_01 having enough space ( 80gb )
Mon Jan 7 00:49:10 2013
Thread 1 advanced to log sequence 448546 (LGWR switch)
Current log# 1 seq# 448546 mem# 0: +TXCOM_DATA_01/txcom/onlinelog/group_1.274.785770579
Current log# 1 seq# 448546 mem# 1: +TXCOM_DATA_01/txcom/onlinelog/group_1.302.802265189
Mon Jan 7 00:49:10 2013
[code]...
In the alert log, I am able to see the archive destination disk group ( TXCOM_BACKUP_01 ) is getting DISMOUNTED and again getting MOUNTED during every archive file generation. .
Mon Jan 7 00:49:20 2013
SUCCESS: diskgroup TXCOM_BACKUP_01 was mounted
SUCCESS: diskgroup TXCOM_BACKUP_01 was dismounted
SUCCESS: diskgroup TXCOM_BACKUP_01 was mounted
SUCCESS: diskgroup TXCOM_BACKUP_01 was dismounted
archive destination parameter in both nodes are not configured. it should read diskgroup name. ( +TXCOM_BACKUP_01 ) and corresponding size limit. Should i configure this ?
SQL> show parameter db_recovery
NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
db_recovery_file_dest string
db_recovery_file_dest_size big integer 0
[code]...
should i bring the database to mount stage and set log_archive_max_proesses to high count ? now value is 2 ( default )
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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 14, 2010
We had our production database hosted on Oracle 9.2.0. Few months back we have migrated it to Oracle 10.2.0.4.0. After Migration I have noticed that redo generation has become very very high. In earlier case no. of log files generating in production hours were around 30 where as after migration it become around 200 files per day. I have run statspack report on this database. Report is saying that db block change & disk write is become very high. Parameter timed_statistics has also been set to FALSE. Even then there is not any reduction on no. of log file generation. I had used import export for upgrading the databases.
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Dec 7, 2011
Whenever any transaction happen in database redo has generated for this transaction. Do select statement treat as a transaction as it doesn't modify any thing in database. And If select statement should not be a transaction, there should not be any redo generation for select statement.
So is select statement generate redo? If yes then Why ?
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May 28, 2013
is it Any way I can put the size of my redo log (During Install Oracle DB 11.1.0.7 )
I mean during installtion .??? becouse its by default 50 MB I need to be 200MB
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Nov 17, 2010
understanding a redo/undo concept . Refer following data
create table t(n number);
insert into t values(10);
commit;
now I update as following
update t set n=20;
As per my understanding the before image i.e. n=10 is stored in undo (to be used for rollback, transaction recovery and even in instance recover but not in media recovery) and after image n=20 is stored in redo (to be used for various recovery purposes including media recovery in case of consistent backup).
So it is redo logs for rolling forward and undo for rolling back making transaction, db consistent . If my above understanding is true then what is meant by the term 'redo required for undo'?
Also, if there are 2 database db1 and db2 connected using database link where we are populating t1 table in db1 using t2 table in db2 using db link where redo and undo will be updated db1 or db2?
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Jun 18, 2012
In one of our envirnoment i could see the redo size is high.Trying to understand why this is more
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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 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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