Creating DB With Flash Recovery (Pros And Cons)
Mar 8, 2011
I am moving an Oracle DB (10.2.0.1) to a new server, by creating a blank DB and importing the data by user. I chose to create the new database with Flash Recovery activated (I haven't previously used this), but I'm having a nightmare when importing the data.
I encountered issues with the DB_RECOVERY_FILE_DEST_SIZE which I resolved by increasing the size of this parameter.
Next the import crawled along because of redo.log file errors "Checkpoint cannot complete". I'm assuming that I need to add redo.log files to accommodate this?
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Nov 4, 2012
I have 3 reporting tables with 2.2 million records each being rebuilt nightly. The data is used online 24/7 by users and thus, snapshot tables are being built from the refreshed reporting tables. The current method to do this:
delete from snapshot table;
insert into snapshot table (select * from report table);
<repeat for other 2 tables>
commit;
This seems to me to be resource intense on the system even though the table is defined with nologging option.
Is it better to create a MV (select only with refresh complete on demand)? The query is very simple without joins so it at first seems like overkill. However, I am also seeing that dbms_mview.refresh allows for an atomic option. Thus, if 1 of the 3 MVs fails during refresh all 3 rollback, which is a nice feature.
Are there better ways to replicate a snapshot table that I've missed? Is a delete and insert strategy a bad idea?
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Jul 8, 2013
i am trying to identify the pro's/con's of using multiple ASM Diskgroup. I understand oracle recommends/best practice is to have 2 DG (one data and one flash) and you can place multiple copies of control files/online redo logs(and thats the way i want to go). But would that same be true if i use different set of DISK. For example we have multiple RAID 10 devices and multiple of SSD devices for us that we can use for this ASM instance. And i was thinking to create 2 more Disk group (call it DG_SYS1 and DG_SYS2) and use that to put my online redo logs, control file and temp and system table space there. i understand in a standalone system(where regular file system is being used), they(online redo/ control file) are usually on there own drives, but with ASM when i am already using external RAID 10 config + ASM striping i assume the IO would faster or am i better of using the SSD that i can have for my redo/control? What would be the pro's/cons of it (besides managing multiple DG)..
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May 22, 2011
I want to change backup location for Oracle 9i Database. there is no flash recovery area in 9i, so i want the parameter which i can use to modify backup location to anywhere i want.
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Mar 3, 2012
what is flash back recovery area? what is its main function and usage
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Aug 18, 2011
here's my settings
SYS@boston>SELECT ESTIMATED_FLASHBACK_SIZE FROM V$FLASHBACK_DATABASE_LOG;
ESTIMATED_FLASHBACK_SIZE
------------------------
45195264
SYS@boston>select name, value, issys_modifiable from v$parameter where name='db
_recovery_file_dest_size';
NAME
--------------------------------------------------------------------------------
VALUE
--------------------------------------------------------------------------------
ISSYS_MOD
---------
db_recovery_file_dest_size
9663676416
IMMEDIATE
SYS@boston>select * from v$recovery_file_dest;
NAME
--------------------------------------------------------------------------------
SPACE_LIMIT SPACE_USED SPACE_RECLAIMABLE NUMBER_OF_FILES
----------- ---------- ----------------- ---------------
D:Ora102chicagooston_recover
9663676416 1671241216 1103842304 50
SYS@boston>select * from v$flash_recovery_area_usage;
FILE_TYPE PERCENT_SPACE_USED PERCENT_SPACE_RECLAIMABLE NUMBER_OF_FILES
------------ ------------------ ------------------------- ---------------
CONTROLFILE 0 0 0
ONLINELOG .04 0 1
ARCHIVELOG .16 .01 21
BACKUPPIECE 16.84 11.41 22
IMAGECOPY 0 0 0
FLASHBACKLOG .25 0 6
6 rows selected.
SYS@boston>
I have configured a flash recovery area of 9g yet the system keeps complaining that i have not enough flashback logs?
SPACE_RECLAIMABLE 1103842304
ESTIMATED_FLASHBACK_SIZE 45195264
the space_reclaimable is more than ESTIMATED_FLASHBACK_SIZE, so how is it possible the system always complain not enough space?
[URL].....
Quote:
SQL> SELECT TO_CHAR(STANDBY_BECAME_PRIMARY_SCN) FROM V$DATABASE;
it returns me 0, I try to flashback the now defunct former primary db chicago, the system complains. so how much is really enough?
from
[URL]......
Quote:
V$FLASHBACK_DATABASE_LOG
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Dec 3, 2010
We are planning to consolidate our Oracle Production DB into one server. We are basically a windows shop. Is it feasible to run 8 production Oracle DB in one windows server. All the DB are not really transaction intensive DB. 2 DB in the size of 300GB and others all DB falls under average size of 40GB.
I can take care of the HD slicing so Oracle does not enter into IO bottleneck. We are planning to go for external NAS or SAN for storage.
My main concern is on processor usage. The processor we are thinking about is Intel Xeon Quad Core x 2nos. Will there be a processor bottleneck or is there way in Oracle to assign processor usage(I belive there is no much tweaking options here)
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Jul 29, 2011
create Oracle archived log to network drive instead of Local drive.
Is there anyway that i can get my archive log created on network drive instead of local drive.
As we want to save our storage space and want to keep archivelog on network.
Is there a way that if Archive log creation on Network drives falis, Oracle create Archivelog on Local drive.
We are running Data warehouse and on daily basis we have 22 to 25 Gig of Archive log created
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Apr 4, 2011
Is there any way to show Flash Movie file in Oracle Forms.
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Oct 23, 2012
11.2.0.2.0
OEL.
Design stage of New SAN. I can put a lot of the database, including redo on SSD.
1. Hardware sub tiering enabled. Has anyone ever gauged performance with enabling 11g Smart flash cache using the SSD as the flash device even with the hardware subtiering on? ie, if the hardware subtiering is moving hotblocks to most performant disk, is there much significant benefit having the flash cache on. Im guessing yes as the flash cache is working at the SGA level.
2. To redo or not to redo on SSD. Many notes say not to so as to avoid log file sync waits. Is there a way to keep it on the SSD and avoid the waits? Is there any risk of enhanced degradation of the disks over time with having so much sequential writes from the redo if I leave it on there?
How to Minimise Waits for 'Log File Sync' [ID 857576.1] (discusses keeping redo off ssd but only generally)
[URL]
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Mar 15, 2005
Could I play an flash .swf file in forms 6i?
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Feb 21, 2004
I want to play the flash movie on to my form....how i can use this facility... how i can import the flash movie in to my form.
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Sep 4, 2012
I just noticed on apex.oracle.com (4.2) that I couldn't find the region source for flash charts. I expected to find it under the Region Definition tab.
Has this moved or will it be included in a later release?
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Mar 19, 2013
Despite it being one of the major selling points of Exadata (especially from X3 onwards), I'm struggling to find much information on our usage of the Exadata Smart FlashCache (I'm running RDBMS 11.2.0.2 BP7 on a V2 quarter-rack).
I can verify usage of the FlashCache by checking whether the object has been 'pinned' to the FlashCache via DBA_SEGMENTS and I can check for FlashCache usage by querying gv$sysstat (and even v$mystat), but are there other views that I could use? It seems a bit strange for Oracle not to provide the DBA all that much insight into their usage of this feature...
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Sep 15, 2011
I'm trying to use 11gR2 Grid Control to manage several 10gR2 database targets. I'm unable to determine the correct mix of Adobe software plug-ins to use for displaying SQL execution plans in a more graphical style. My client OS is Windows 7 - I have tried to research plug-ins for Internet Explorer 8, I upgraded (and subsequently downgraded!) to IE 9; I installed Firefox 6.x, tried with Google Chrome and all with the same results.
I'm not seeing any relevant information from MyOracle support or on Google, but may not be asking the correct question. As far as I can determine, SVG 3.0 is needed, Adobe stopped development in 2009 and there is no variant available therefore for Windows 7.
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Aug 11, 2010
I have OEl 5.5 installed and patched. I have my SSD mounted..
but when i ran the command 'alter system set db_flash_cache_file ='/media/ssd/' scope=spfile;'
It wouldn't startup giving ORA-01078: failure in processing system parameters...
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Dec 30, 2010
Can i accomplish animation with JavaScript or will i have to turn into Flash?
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Jun 3, 2013
The following query is used to generate a flash chart:
select null link
'Available' as "Available",
to_number(max_licenses - consumed_licenses)
from software_detail
where capture_date = trim(GET_CAPTURE_DATE)
and software_product = :p1
and software version = :p2
[code].....
But the 2d doughnut flash chart shows:
Available = 39
Consumed = 1
How is this possible?
Oracle 11.2.0.3 RAC on Windows 2008 R2
APEX 4.2.1.00.0 with Apex Listener 2.0 on Apache Tomcat 6.
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Dec 4, 2012
Is there any way I could customize tooltip (when you go over the bar in the report, small box with the value appears).I would like to display different values there.
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Jun 22, 2012
I am trying to do a Flash Chart in APEX 3.1. Is there a limitation on how many labels I can get horizontally. No matter what I do the number of labels I get horizontally is 15. We are trying to show the amount of days in a month.... Can I do that? If so how?
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Nov 12, 2012
APEX 4.2 Theme 25 Oracle DB 11gr2 - I need to conditionally display Html5/Flash chart regions depending on browser compatibility, how to achieve this.
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Jan 25, 2011
SQL> alter database mount;
Database altered.
SQL> alter database open resetlogs;
alter database open resetlogs
*
ERROR at line 1:
ORA-01139: RESETLOGS option only valid after an incomplete database recovery
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Aug 13, 2013
My scenario is: database is in archivelog mode.
I run DLY cold backups including controlfile & archivelogs and keep 3 gens of backups and archivelogs to 3 days also. What is the correct procedure to restore back to an old cold backup. Database is backed up Mon,Tue,Wed on Thur we require to bring database back to Tuesday DLY security.
I have tried:
startup mount
restore database from tag 'DLYTUE'
recover database
( this just rolls forward on all archive logs once it restores datafiles, not getting to point to alter database open resetlogs.)
Next tried to :
recover database archivelog tag 'DLYTUE'
( same outcome )
What is the correct rman procedure including should I remove old archive logs from working OS directory ? Also need to know once I restore back and open database to TUE security how do you tidy up the archive logs and dumps which are no longer require i.e. : weds..
I have read about using the set until time option but how to I get absolute time from when cold backup completed if this is the correct procedure.
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May 28, 2008
I need to make my database to ARCHIVELOG mode when i try it it gives below following error
SQL> alter database archivelog;
alter database archivelog
*
ERROR at line 1:
ORA-00265: instance recovery required, cannot set ARCHIVELOG mode
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Sep 28, 2011
I have a database in Archivelog mode and Flashback mode. I am trying to connect to RMAN. But am getting the error
SQL> select name,log_mode,flashback_on from v$database
2 /
NAME LOG_MODE FLA
--------- ------------ ---
ORCL ARCHIVELOG YES
SQL> show user
USER is "SYS"
SQL> host rman target /
[code]....
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Oct 18, 2012
I just switched my STBDY DB to a PRIMARY DB and I am ran the following:
RMAN> CONFIGURE ARCHIVELOG DELETION POLICY TO NONE;
using target database control file instead of recovery catalog
old RMAN configuration parameters:
CONFIGURE ARCHIVELOG DELETION POLICY TO APPLIED ON STANDBY;
new RMAN configuration parameters:
CONFIGURE ARCHIVELOG DELETION POLICY TO NONE;
new RMAN configuration parameters are successfully stored
ORA-00245: control file backup operation failed
RMAN-08132: WARNING: cannot update recovery area reclaimable file list
RMAN> show all;
RMAN configuration parameters for database with db_unique_name ORARZULB are:
CONFIGURE RETENTION POLICY TO RECOVERY WINDOW OF 30 DAYS;
CONFIGURE BACKUP OPTIMIZATION OFF; # default
CONFIGURE DEFAULT DEVICE TYPE TO DISK;
CONFIGURE CONTROLFILE AUTOBACKUP ON;
[code]....
what causes this warning and how to get rid of it?
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Jun 27, 2012
How i can manually allocate channel for my backups going to tape?
For disk backups i can do and it work...
RUN
{
ALLOCATE CHANNEL disk1 DEVICE TYPE DISK FORMAT 'J:dbname\%U';
restore database preview;
}
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Jun 7, 2013
I am using RMAN with a recovery catalog option on a separate Database. My question is
When we use catalog does RMAN keep the information in Control file of the Target Database as well or only in recovery catalog? I am asking this in case We lost the database which contains the recovery catalog what to do?
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Feb 11, 2011
I have recently patched my catalog home to 9208 from 9204; the target database is still on 9204 but now I cannot connect to the catalog database.
oracle@mogw:TES1:/u01/app/oracle/admin/TES1/bdump
rman rcvcat rman/rman@RMANDB
Recovery Manager: Release 9.2.0.4.0 - 64bit Production
Copyright (c) 1995, 2002, Oracle Corporation. All rights reserved.
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
[code]...
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Jun 25, 2013
While connecting to target database from stand database. I am getting below error.
calhost dbs]$ sqlplus system/oracle@proddb
SQL*Plus: Release 10.2.0.1.0 - Production on Sat Jun 22 00:18:10 2013
Copyright (c) 1982, 2005, Oracle. All rights reserved.
Connected to: Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - Production With the Partitioning, OLAP and Data Mining options
SQL> exit
Disconnected from Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - Production
With the Partitioning, OLAP and Data Mining options
[standdb@localhost dbs]$ rman target system/oracle@proddb auxiliary system/oracle@standdb
Recovery Manager: Release 10.2.0.1.0 - Production on Sat Jun 22 00:18:22 2013
Copyright (c) 1982, 2005, Oracle. All rights reserved.
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-00554: initialization of internal recovery manager package failed
RMAN-04005: error from target database:
ORA-01031: insufficient privileges
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