Understanding Oracle checkpoint in depth
Dear All,
I am trying to find some good information about Oracle checkpoints and SCNs to have a thorough and deep understanding of the same.
Could someone provide me with some good links.
Thanks.
Hi;
Hussein Sawwan already answered your question, In addition to his great post
Please see:
Difference between SCN and checkpoint.
http://sai-oracle.blogspot.com/2006/03/difference-between-scn-and-checkpoint.html
Oracle Checkpoint mechanisim
http://www.adp-gmbh.ch/ora/concepts/checkpoint.html
http://www.orafaq.com/wiki/Checkpoint
Regard
Helios
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Hi All,
I am a bit confused about the working of DBW0 and LGWR processes.
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Cheers
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Hi experts,
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Hi,
We are planning to implement Oracle WMS in our company. Currently we are using High Jump software for all our warehouses. Some of the warehouse functions as Cross Dock or some as Storage. Can some body give me some inputs for the following so that i can prepare a doc and present it to my upper management.
1. Some articles/training material which talks about complete functionalities in Oracle WMS( I would like to know more about Warehousing, Yard management and Customer Reporting)
2. Is there any document which talks about the advantages of Oracle WMS over HighJump WMS? (I did search in web for 2-3 days but couldn't find much info)
It would be really help if anybody help me to find outmore info on Oracle WMS.
Thanks everyone.Hi,
If you are still looking for information and have a CSI for My Oracle Support, you might consider posting your question to the Logistics Community which is a venue for current customers to discuss WMS:
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LOG_USER NOT NULL VARCHAR2(30)
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THIS_DATE DATE
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---------------------------------------------------------------- ----------...and then how to post with tags: http://forums.oracle.com/forums/help.jspa
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I am new to Oracle and need to ask a question.
Some oracle tables appear to act different than in DB2.
I determine that the number of records within dba_jobs is 1.
Then I describe the table and find there are about
18 columns within the table.
Then I perform a SELECT * on the table.
When I do the select, it looks like it is printing out about 8 different records.
With only the MISC ENV field being populated.
How should I interpret this
The following are the commands I entered:
SQL> select count(*) from dba_jobs;
COUNT(*)
1
SQL> describe dba_jobs;
Name Null? Type
JOB NOT NULL NUMBER
LOG_USER NOT NULL VARCHAR2(30)
PRIV_USER NOT NULL VARCHAR2(30)
SCHEMA_USER NOT NULL VARCHAR2(30)
LAST_DATE DATE
LAST_SEC VARCHAR2(8)
THIS_DATE DATE
THIS_SEC VARCHAR2(8)
NEXT_DATE NOT NULL DATE
NEXT_SEC VARCHAR2(8)
TOTAL_TIME NUMBER
BROKEN VARCHAR2(1)
INTERVAL NOT NULL VARCHAR2(200)
FAILURES NUMBER
WHAT VARCHAR2(4000)
NLS_ENV VARCHAR2(4000)
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INSTANCE NUMBER
SQL> select * from dba_jobs;
JOB LOG_USER PRIV_USER
SCHEMA_USER LAST_DATE LAST_SEC THIS_DATE THIS_SEC NEXT_DATE
NEXT_SEC TOTAL_TIME B
INTERVAL
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WHAT
NLS_ENV
MISC_ENV INSTANCE
1 SYSMAN SYSMAN
JOB LOG_USER PRIV_USER
SCHEMA_USER LAST_DATE LAST_SEC THIS_DATE THIS_SEC NEXT_DATE
NEXT_SEC TOTAL_TIME B
INTERVAL
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WHAT
NLS_ENV
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SYSMAN 20-APR-09 22:29:55 20-APR-09
JOB LOG_USER PRIV_USER
SCHEMA_USER LAST_DATE LAST_SEC THIS_DATE THIS_SEC NEXT_DATE
NEXT_SEC TOTAL_TIME B
INTERVAL
FAILURES
WHAT
NLS_ENV
MISC_ENV INSTANCE
22:30:55 17989 N
JOB LOG_USER PRIV_USER
SCHEMA_USER LAST_DATE LAST_SEC THIS_DATE THIS_SEC NEXT_DATE
NEXT_SEC TOTAL_TIME B
INTERVAL
FAILURES
WHAT
NLS_ENV
MISC_ENV INSTANCE
sysdate + 1 / (24 * 60)
JOB LOG_USER PRIV_USER
SCHEMA_USER LAST_DATE LAST_SEC THIS_DATE THIS_SEC NEXT_DATE
NEXT_SEC TOTAL_TIME B
INTERVAL
FAILURES
WHAT
NLS_ENV
MISC_ENV INSTANCE
0
JOB LOG_USER PRIV_USER
SCHEMA_USER LAST_DATE LAST_SEC THIS_DATE THIS_SEC NEXT_DATE
NEXT_SEC TOTAL_TIME B
INTERVAL
FAILURES
WHAT
NLS_ENV
MISC_ENV INSTANCE
EMD_MAINTENANCE.EXECUTE_EM_DBMS_JOB_PROCS();
JOB LOG_USER PRIV_USER
SCHEMA_USER LAST_DATE LAST_SEC THIS_DATE THIS_SEC NEXT_DATE
NEXT_SEC TOTAL_TIME B
INTERVAL
FAILURES
WHAT
NLS_ENV
MISC_ENV INSTANCE
NLS_LANGUAGE='AMERICAN' NLS_TERRITORY='AMERICA' NLS_CURRENCY='$' NLS_ISO_CURRENC
JOB LOG_USER PRIV_USER
SCHEMA_USER LAST_DATE LAST_SEC THIS_DATE THIS_SEC NEXT_DATE
NEXT_SEC TOTAL_TIME B
INTERVAL
FAILURES
WHAT
NLS_ENV
MISC_ENV INSTANCE
Y='AMERICA' NLS_NUMERIC_CHARACTERS='.,' NLS_DATE_FORMAT='DD-MON-RR' NLS_DATE_LAN
JOB LOG_USER PRIV_USER
SCHEMA_USER LAST_DATE LAST_SEC THIS_DATE THIS_SEC NEXT_DATE
NEXT_SEC TOTAL_TIME B
INTERVAL
FAILURES
WHAT
NLS_ENV
MISC_ENV INSTANCE
GUAGE='AMERICAN' NLS_SORT='BINARY'
JOB LOG_USER PRIV_USER
SCHEMA_USER LAST_DATE LAST_SEC THIS_DATE THIS_SEC NEXT_DATE
NEXT_SEC TOTAL_TIME B
INTERVAL
FAILURES
WHAT
NLS_ENV
MISC_ENV INSTANCE
0102000000000000 0
JOB LOG_USER PRIV_USER
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---------------------------------------------------------------- ----------Thanks,
Edited by: user10747262 on Apr 21, 2009 11:56 AMHello,
Can you edit your post and enclose your code and output between \ tag to preseve formatting? Also list out all the questions before your output so it will be easier for any volunteer to help you out faster.
\Your code or output goes here.
\Regards -
Understanding Oracle 10G - Server Generated Alerts
Hi,
Could you guys please tell me what is the difference Oracle 10G - Server Generated Alerts and alerts based on metric baseline and adaptive thresholds.
Does the alerts based on metric baseline use the underlying Server Generated Alerts mechanism (MMON process etc)?
Thanks,
NeerajI mean to say about the underlying concept.
In oracle 9i, I used to use Oracle EM alerts that are carried out by EM daemon (EMD). Then in oracle 10g, Oracle introduced server-generated alerts, where MMON background process is responsible for generating these alerts.
While reading oracle database 11g new features, I read about adaptive thresholds, metric baseline etc. I just checked that all these features were available in Oracle 10g itself. What is new?
Secondly, how server-generated alerts are different from alerts based on adaptive thresholds?
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Understanding Oracle Support and License
Hi Gurus,
I have a few questions regarding Support for Database Product:
1. If I have Product License for 10gR2 EE, will I be supported on 9i and 11g.
2. Will it be legal to use 11g if Product Licence is for 10gR2
3. What is ULA (Unlimited License Agreement)
Can someone give me links for documents or suggest something? Any help is appreciated.
Regards,
VirendraThe answer is, it's insane. I mean, it depends.
For example, Oracle is giving a hard time to hp-ux Itanium customers, so you can have 9i and still get some patches under extended support until July 2012, but not with 10gR2 EE.
http://www.oracle.com/us/support/library/lifetime-support-technology-069183.pdf
http://www.oracle.com/us/support/057419.pdf#page=6
So some things to note:
You should not trust anything anyone on the internet tells you about licensing.
Different countries have different rules.
Keep anything from Oracle that you find on the internet locally, as it may change at any time.
You can try to download patches from support, it won't let you if you are not allowed. So if you are 10gR2 Itanium, you might be able to get a July CPU but not an October one.
Some scary stories are floating about concerning license audits.
Things you are not licensed for and have explicitly removed may come back with a patch, and then get caught in a license audit and you get charged.
Oracle support features can upload your configuration to Oracle, as well as make world-readable files on your host.
In general, you are licensed for a product, and pay support for patches.
In my honest opinion, it is stupid not to pay for support.
You should not trust anything anyone on the internet tells you about licensing.
There are also videos and notes on MOS explaining how to deal with support. Personally, I've found going through the methods listed often answer my questions before I get ready to ask support. -
Need help in understanding oracle plsql design phase.
I am new user learning oracle plsql. I wanted to know following points.
1) Is there any process we follow before developing oracle procedures.
2) Is there any algorithm, flowchart, diagrams we use for orcale procedure development.
3) What should I learn in order to start developing oracle procedures.
flow charts
data flow diagrams
In there any standard used in industry ? any pointers/comments would be helpful1) It is different in every shop and even within a shop with different developers. The best thing for someone learning is to read the books and blogs of Tom Kyte and Steven Feuerstein and choose one. Though I must confess now that I have become a fan of Bryn Lewellyn's White Papers I may never go back.
Try one out yourself:
http://www.oracle.com/technology/tech/pl_sql/pdf/doing_sql_from_plsql.pdf
PS: No one knows PL/SQL better than Bryn.
2) No. Every procedure is different. What one writes to solve one business problem may bear no relationship to what one writes to solve another. My caveats would be:
A. SQL before PL/SQL
B. Arrays before single row processing (that means FORALL and BULK COLLECT)
C. Don't write line 1 without reading Tom Kyte's observations about bind variables
3) In this order:
A. anonymous blocks
B. how to declare constants
C. how to declare variables
D. how to create control structures
E. exception handling
F. bulk collect and forall statements
G. DBMS_SQL built-in package
H. Native dynamic SQL
You will find demos of all of the above here:
www.morganslibrary.org/library.html -
Oracle Startup & SCN Concept in Depth
I have few questions about Oracle SCN.
I will taking few different scenario.
( Note- The following condtions true in all cases.
(a)- No Recovery Catalog
(b)- Backup and Recovery with RMAN) )
Different Cases
Case 1. Oracle Instance shutdown with command
SQL > Shutdown immediate
Case 2. Oracle Instance shutdown with command
SQL > SHUTDOWN ABORT
Case 3.Oracle Datafile (system.dbf) file deleted with operating System Command
# rm -rf system01.dbf
SQL > SHUTDOWN ABORT
The following conditions true in Case3.
(a) Database is running in ARCHIVELOG Mode.
(b) No loss on Control File and Online Redo Log Files.
Case 4. All the Oracle Control File deleted with Operating System Command.
# rm -rf *.ctl
SQL > SHUTDOWN ABORT
The following conditions true in Case4.
(a) Database is running in ARCHIVELOG Mode.
(b) No loss on datafile File and Online Redo Log Files.
Case 5. All the Oracle Control File & System dbf deleted with Operating System Command.
# rm -rf *.ctl
# rm -rf system01.dbf
SQL > SHUTDOWN ABORT
The following conditions true in Case5.
(a) Database is running in ARCHIVELOG Mode.
(b) No loss on Online Redo Log Files.
Case 6. All the Oracle Control File & Online Redo Log File deleted with Operating System Command.
# rm -rf *.ctl
# rm -rf *.log
SQL > SHUTDOWN ABORT
The following conditions true in Case5.
(a) Database is running in ARCHIVELOG Mode.
(b) No loss on datafile Files.
Question-
A> Let me know How Oracle SCN concept will work in above mentioned scenario ?
B> How SCN Synronization will happen ?
C> How Oracle Database will understand what file Needs Restoration and Recovery ?
D> What the meaning of SCN Synronization ? If Database synronize Control File SCN number with DBF File SCN then how it will work when we loose Control File.Srinivas,
Thanks for Reply,
Actually, What i am feeling is till the time Control file is available, There is no issue in Backup and Recovery. Its very simple to understand Oracle will take all the information from Control File and Corresponding do all backup and Recovery.
My Main confusion start with rm -rf *.ctl (delete all existing Control File).
Most of the Control File documents discuss about major component for ex. Datafile Info, Redo File Info etc. The information which we can get from control file Dump.
But none discussed about Oracle Complete Control File Architecture.
I read following good documents about Control File architecture
a) http://esemrick.blogspot.com/2006/02/backup-control-files-are-they-special.html
b) http://www.ixora.com.au/notes/controlfile_structure.htm
But still not comfortable with Oracle Control File in depth architecture.
If you can share some Control file in depth documents, It will solve my problem.
Thanks in advance.
Sumit
Bangalore, India
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