A Success Story & First Impressions of New Features

Like many of you I was plagued with some of the serious problems with updating my Domain file: disappearing photos, missing blog comments, missing link bars at the top of the page etc. I tried the various tip and tricks sugested here with no luck. When the 2.01 update to iWeb appeared last Friday I downloaded it but I held off using it. I had already lost about 6 hours out of my life playing around with iWeb 2.0 with nothing to show for it. After reading many posts saying it didn't help I was going to hold off.
Don't ask me why, but I changed my mind. Monday I started working on my site. Creating 10 album pages to replace my homegrown versions, adding some navigation aids, relinking etc. I also moved the photo I wanted to show as the album preview to the first position on each photo page. All in all I spent about 8 hours working on the site. I would save every 10 minutes or so and duplicate the domain file and keep several generations of these around. There were no missing photos, crashes or hiccups of any kind.
This morning I uploaded the site. The first thing I noticed is this version of iWeb seems to be faster creating the files to be uploaded. Much faster. I'm not sure if this is an improvement to the code or a result of the smaller domain files created in iWeb 2. Instead of 15 minutes or so it took 5. The first upload of the files to .mac took just as long as ever, nearly 45 minutes on a high speed cable modem connection. As the upload was completing the first hiccup occured-the upload failed with a message saying there was an error creating a file. I was not optomistic at this point. I figured I was having the upload problem others have reported. All my page icons were back to red and I figured it was back to square 1. At least all the content was still in the Domain file.
When I hit the upload button the second time it took the same 5 minutes to create the files, but the upload to 30 seconds. It evidently just repaced the file that had the problem. I have since made edits to my site several times and iWeb seems to be much faster uploading the pages. I get the impression it doesn't reupload the whole page content but merely uploads the changed portion. I added a text box to 30 pages and the changes uploaded to .mac in about a minute. I am very pleased with this increase in speed.
As for the site itself I love the new features. I love the picture gallery where clicking on a picture opens up a larger copy and gives you thumbs of the other pages. I tried my site in 3 different Mac browsers with no issues and also the latest IE for Windows running under Parallels 3. Unlike what others have reported, my slideshows appear normal size on the PC. I like the new album pages and the automatic linking they provide. In iWeb itself I like being able to collapse the album folder to reduce the clutter in the navigation sidebar. I like the fact you can create a blank page now. You don't have to strip another page type to get a blank page. The skimming effect on album pages works equally well on the Mac or PC side. One interesting thing I have noticed is the picture captions are in a different font on the PC side. I use the Freestyle template for my site and the picture captions are in a handwritten style font (Handwritten-Dakota). In the past these would be converted to .png image files so they would display correctly on the PC. In this version the fonts are rendered in a serif font that looks like times. I imagine this may make the page load faster but I'm not surre if I like this feature or not. The page does look drastically different.
Speaking of dislikes there are a couple. I wish iWeb would ask you before it goes and downsamples your photos while converting to the 2.0 format. I don't like the idea that if you want to use the high quality hi res versions you have to reinsert and recaption them. Like many others I would like to be able to turn off the download button when viewing the photo galleries.
While I think Apple deserve a spanking for the initial release of iWeb 2.0, now that the patch seems to be working for me I feel it is a worthy upgrade. I am 90 percent happy with the new features and I think the other 10 percent can be tweaked by Apple in response to user feedback. If you'd care to stop by and visit my site here is the address:
http://web.mac.com/jmahoney
I hope those of you still having trouble will get your sites up and runing soon. If you held off on the 2.01 upgrade, you might want to give it a shot (after backing up your Domain file). I was pleasantly surprised.
Jim Mahoney

Thanks for your account and experience with the new iWeb.
Nice site now, although vegetarians better skip it
I personally got rather hungry viewing it. And it is only 13.30 here.

Similar Messages

Over 100 new features on iphone?

ok i saw the first 3-4 new features, where are the other 96? what a long wait for the new software for a couple features. does it really take that much to add a few basic features? i cant live without this addicting phone, but i need MORE MORE MORE!!!!

I'm not going to list all 100 new features, just the highlighted new features from the 3.0 update website.
Cut, copy and paste.
Landscape keyboard for Mail, Messages, and Notes in addition to Safari.
MMS - to be available later this summer.
Spotlight search - globally for the entire iPhone.
Email search.
iPod search.
Voice memos.
Improved calendar - with support for subscribing to calendars with CalDAV support. Create meetings via Microsoft Exchange ActiveSync.
Buy and download Movies, TV Shows, and Audiobooks direct with the iPhone.
Enhanced stocks app.
Safari improvements - autofill user names and passwords, and more.
Support for internet tethering.
Stereo Bluetooth.
Automatic Wi-Fi login.
Sync notes.
Additional parental controls.
Create and log in to one or more iTunes Store accounts directly from the iPhone.
YouTube login - login to your YouTube account with the YouTube app to save and sync bookmarks.
Shake to shuffle with the iPod.
New languages.
MobileMe find my iPhone and remote wipe.
Run the next generation of iPhone apps such as peer-to-peer games connecting with another iPhone via Bluetooth to play a game with someone else.
Two more home screens available for apps.
This link includes an unofficial list.
http://forums.macrumors.com/showthread.php?t=715629

Merry Christmas, My "New" PB, First Impressions...

My first post and first Mac:
Not new to computers, but new to Macs. As a rule, I try to help other users as at least as much as the help I receive. That won't be the case on this forum, as I'm a total Mac noob. Perhaps, as time passes, I'll be able to field simple questions, but that may take a while.
This Christmas we replaced our son's two year old PB with an MBP. We got the hand-me-down. We wouldn't even own a Mac, except it's required by his college for digital design. This is also my first notebook, so I guess many issues are unique to that fact.
After one day of ownership, I've had the following observations:
1. During file transfer over airport, application "locked up", or was "unresponsive". My son used the equivalent of the Windows Task Manager to close it.
2. iTunes was unusable because, "The folder iTunes is on a locked disk or you do not have write permissions for this folder." Resolved by changing properties of... something, didn't get the full story yet, but it has to do with changing administrator of the computer.
3. Bluetooth does not have A2DP protocol... bummer!
4. Saw the DVD unable to be ejected from his MBP during OS installation. Sheesh!
Well, that's it so far. I will be back with questions, because he'll be going back to school in a couple weeks. I generally find answers via Google, but sometimes that's not enough. My first impressions are a little disappointing, but maybe that's because I've heard too much hype, such as "It Just Works", and "Switch to a Mac and You'll Never Go Back". I own it, now I'm gonna use it by hook or by crook!

0rnery wrote:
One other point I forgot to mention was regarding the rubber feet on the bottom. One was lost, so my son removed a second in order for it to sit level. Online, I found the price of replacements at $20.00! I'm using a couple old mouse feet in the mean time, but is there not an aftermarket source for such items at a reasonable price?
Probably not, but who cares? If you can let go of having to have the exact size, thickness, and material, you can do what I've done for years: Go to your neighborhood hardware store or drugstore and pick up a $1 sheet of little self-adhesive rubber feet. There are many kinds, of course, mostly hovering around one dollar for more than you'll ever need. The ones I picked are clear, so no one notices they don't quite match, and thicker, so they absorb shock better and raise the back another millimeter or two for better bottom ventilation, and they "grab" better so the laptop no longer slides around with a slight nudge. These are actually better than the original equipment feet.
0rnery wrote:
...I can't wait to see what iTunes does with this 4GB of MP3's.
My PowerBook G4 has 13.29GB of music in iTunes, doesn't seem to be any problem. On the Mac Pro I've got 30GB of audio and video.

Having mail 4.5 issues- open mail and get a new features message so I must import messages first in order to use mail 4.5. Just recently put in MAC OSX 10.6.7. Once it imports click done to start using mail, but end up with the rainbow wheel? Now What?

Having mail 4.5 issues- open mail and get a new features message that says in order to use the new features, I must import existing messages into the new version first in order to use mail 4.5. Just recently put in MAC OSX 10.6.7. Once it imports I am to click done to start using mail, but end up with the rainbow wheel of death and it also says you cannot use mail until the import is finished? Now What?

Is Mail still "spinning"? If it's been doing that for a while, I'd kill it, using either Activity Monitor or the OS X application picker. Then relaunch Mail and see what happens.
Two "by the ways":
1) Your system details mention an PPC iMac. Since a non-Intel Mac can't run OS X 10.6, you seem to have another Mac. You might want to consider updating your system details.
2) You seem to have been misled by the poor labeling of the message composition fields on this forum into trying to enter your entire post into the "subject" field. In the future, just enter a summary of your post there and the main text into the field below it.

Successfully downloaded iOS5 but missing some "new feature" apps???

I've successfully completed the download; however, some of the advertised applications are missing. For example, I've located the option to download Twitter within the Settings application and I've located the new "Reminders" and "Videos" apps; however, I cannot locate the "notifications", "PC free" or "wi-fi sync". Are these imbedded within other applications? Can someone enlighten me on how to access these new features?
Regards,
Middlebunny

there only seems to be 10 pages of apps not the 11 pages of apps I thought it would have
It depends how many you have installed
Does the 3.0 update not include the landscape for the keyboard?
Yes, it does, but it depends on the application. It applies to the built-in Mail, Notes & Safari applications.
Not all third-party applications have been updated for landscape keyboards.

An Oracle Forms Success story

Hi:
I believe that in the forum we tend to post "I need help. Please help" "Oracle has issues!", etc, kind of topics. I am going to try to change that and will start posting now and then my "Oracle Forms" success stories that will hopefully help us all in sharing when we do something right and not just sharing when we need assistance. By the way, I do realise that there are plenty of great people in this forum already sharing their positive findings, I just would like all of us to start doing it on a regular basis.
Having said that, here is my first success story:
On Friday, I was having a conversation with one of our users and setting her up with our Web based application. Since we are moving her from a character based application, I was emphasizing to her how in the new GUI/Web based application it was important and benefitial to start using the mouse. To this she said "You know Thomas, we use Salesforce and recently we noticed that they have enabled the ability to click on any field and make it editable. Also, she said, you know how in our application we very often find ourselves going to a field and then pressing Ctrl-Y to bring up the full contents of the text. I just think that it would be really great if our new Mouse-enabled application would allows us to simply double click a filed and bring up the full text. Is this now possible? she asked. I paused and ran the request quickly in my head, since I made sure that certain things happened when we converted our Forms from character to Web platforms (i.e. I made sure that we referenced Object Groups to all of our forms), I was able to quickly (within a minute after she finished her question) answer to her that it was possible to accomplish what she described relatively trivially, but that it was still not enabled. Confident in my understanding of the whole app and in the hooks that I had installed during our upgrade, I promissed her that I would have a definite estimate and full answer by Monday.
I went home Friday and went to a school Carnival with my two beautiful children and awesomely beautiful wife (I have been told by co-workers that she looks a lot like Gina Lollobrigida) so I forgot about the request for the rest of the evening. Saturday morning I woke up and the first tought in my head was: I got it! I turned on my computer, coded and tested the solution against a couple of forms in five minutes and convinced my self I was right with my first tought. I then compiled the rest of the forms (around three hundred) and tested a few selective ones and verified that indeed I had solved the problem. I am now ready not only to tell her how easy it but to have her experience it in our development environment first thing on Monday, hopefully giving her a sense for how great our new platform is.
The End
Here is my code:
IF NOT SUBSTR(RTRIM(RTRIM(GET_ITEM_PROPERTY(NAME_IN('SYSTEM.TRIGGER_ITEM'), PROMPT_TEXT)), ':'), -1) IN ('*', '+') THEN
    DO_KEY('EDIT_TEXTITEM');
ELSIF :SYSTEM.MOUSE_ITEM IS NOT NULL THEN
    DO_KEY('LIST_VALUES');
END IF;How did I deliver to all 300+ forms:
We have a form (called base.fmb) that contains all of our common forms objects and an OLB called common_obj.olb.
All of our forms have an object group called BASE_TRIGGERS referenced in.
1) I created a WHEN-MOUSE-DOUBLE-CLICK trigger with PL/SQL above.
2) I added WHEN-MOUSE-DOUBLE-CLICK to BASE_TRIGGERS objec group.
3) I copied BASE_TRIGGERS from base.fmb to common_obj.olb to upgrade object group.
4) I installed common_obj.olb to our UNIX deployment box.
5) I compiled a few of the modules and tested in the app.
6) I ran a full recompile.
Why does it work:
1) The code above written PSEUDOLLY means:
IF the prompt associated with the field does not end in * or + THEN
    SHOW THE EDITOR
ELSE
     Execute KEY-LISTVAL
END IF2) Somebody very smart in our company introduced this neat notation to place a plus sign (+) at the end of the prompt for every field tha has a list of values. Also, that person had an asterisk (*) placed at the end of field prompts that provided drilled down (calling another form o show detail) to another form.
3) Oracle, in a great white paper made me aware of the fact that when converting from character to Web all field prompts needed to be converted from Text to the Prompt property and furthermore, in their great wisdom, to make it easy they actually put a button right on the designer to make it trivial to accomplish.
Hope this is a good start,
Thomas
P.S. If I left anything out or you have any questions, please feel free to ask.
Message was edited by:
Thomas Morgan
Message was edited by:
Thomas Morgan

Great idea to post success stories. Kudos for giving step-by-step instructions.
Was the notation using plus or asterisk to signal the user if there's an LOV or drill-down available in place in your character based app or was it implemented during the GUI conversion? This is probably a matter of UI opinion, but does the notation clutter the screen a bit ad did you try other visual prompts? I like the notation because you don't have to click in or tab to the field to see if a LOV is available. That's a big benefit that probably outweighs the issue of screen clutter.

Oracle 10G New Feature........Part 1

Dear all,
from last couple of days i was very busy with my oracle 10g box,so i think this is right time to
share some intresting feature on 10g and some internal stuff with all of you.
Have a look :-
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Oracle 10g Memory and Storage Feature.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1.Automatic Memory Management.
2.Online Segment Shrink
3.Redolog Advisor, checkpointing
4.Multiple Temporary tablespace.
5.Automatic Workload Repository
6.Active Session History
7.Misc
a)Rename Tablespace
b)Bigfile tablespace
c)flushing buffer cache
8.ORACLE INTERNAL
a)undocumented parameter (_log_blocks_during_backup)
b)X$ view (x$messages view)
c)Internal Structure of Controlfile
1.Automatic memory management
================================
This feature reduce the overhead of oracle DBA.previously mostly time we need to set diff oracle SGA parameter for
better performance with the help of own experience,advice views and by monitoring the behaviour
of oracle database.
this was just time consuming activity.........
Now this feature makes easy life for oracle DBA.
Just set SGA_TARGET parameter and it automatically allocate memory to different SGA parameter.
it focus on DB_CACHE_SIZE
SHARED_POOL_SIZE
LARGE_POOL
JAVA_POOL
and automatically set it as
__db_cache_size
__shared_pool_size
__large_pool_size
__java_pool_size
check it in alert_log
MMAN(memory manager) process is new in 10g and this is responsible for sga tuning task.
it automatically increase and decrease the SGA parameters value as per the requirement.
Benefit:- Maximum utlization of available SGA memory.
2.Online Segment Shrink.
==========================
hmmmmm again a new feature by oracle to reduce the downtime.Now oracle mainly focus on availablity
thats why its always try to reduce the downtime by intrducing new feature.
in previous version ,reducing High water mark of table was possible by
Exp/imp
or
alter table move....cmd. but on these method tables was not available for normal use for long hrs if it has more data.
but in 10g with just few command we can reduce the HWmark of table.
this feature is available for ASSM tablespaces.
1.alter table emp enable row movement.
2.alter table emp shrink space.
the second cmd have two phases
first phase is to compact the segment and in this phase DML operations are allowed.
second phase(shrink phase)oracle shrink the HWM of table, DML operation will be blocked at that time for short duration.
So if want to shrink the HWM of table then we should use it with two diff command
first compact the segment and then shrink it on non-peak hrs.
alter table emp shrink space compact. (This cmd doesn't block the DML operation.)
and alter table emp shrink space. (This cmd should be on non-peak hrs.)
Benefit:- better full table scan.
3.Redolog Advisor and checkpointing
================================================================
now oracle will suggest the size of redo log file by V$INSTANCE_RECOVERY
SELECT OPTIMAL_LOGFILE_SIZE
FROM V$INSTANCE_RECOVERY
this value is influence with the value of FAST_START_MTTR_TARGET .
Checkpointing
Automatic checkpointing will be enable after setting FAST_START_MTTR_TARGET to non-zero value.
4.Multiple Temporary tablespace.
==================================
Now we can manage multiple temp tablespace under one group.
we can create a tablespace group implicitly when we include the TABLESPACE GROUP clause in the CREATE TEMPORARY TABLESPACE or ALTER TABLESPACE statement and the specified tablespace group does not currently exist.
For example, if group1 is not exists,then the following statements create this groups with new tablespace
CREATE TEMPORARY TABLESPACE temp1 TEMPFILE '/u02/oracle/data/temp01.dbf'
SIZE 50M
TABLESPACE GROUP group1;
--Add Existing temp tablespace into group by
alter tablespace temp2 tablespace group group1.
--we can also assign the temp tablespace group on database level as default temp tablespace.
ALTER DATABASE <db name> DEFAULT TEMPORARY TABLESPACE group1;
benefit:- Better I/O
One sql can use more then one temp tablespace
5.AWR(Automatic Workload Repository):-
================================== AWR is built in Repository and Central point of Oracle 10g.Oracle self managing activities
is fully dependent on AWR.by default after 1 hr, oracle capure all database uses information and store in AWR with the help of
MMON process.we called it Memory monitor process.and all these information are kept upto 7 days(default) and after that it automatically purge.
we can generate a AWR report by
SQL> @?/rdbms/admin/awrrpt
Just like statspack report but its a advance and diff version of statspack,it provide more information of Database as well as OS.
it show report in Html and Text format.
we can also take manually snapshot for AWR by
BEGIN
DBMS_WORKLOAD_REPOSITORY.CREATE_SNAPSHOT ();
END;
**The STATISTICS_LEVEL initialization parameter must be set to the TYPICAL or ALL to enable the Automatic Workload Repository.
[oracle@RMSORA1 oracle]$ sqlplus / as sysdba
SQL*Plus: Release 10.1.0.2.0 - Production on Fri Mar 17 10:37:22 2006
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
SQL> @?/rdbms/admin/awrrpt
Current Instance
~~~~~~~~~~~~~~~~
DB Id DB Name Inst Num Instance
4174002554 RMSORA 1 rmsora
Specify the Report Type
~~~~~~~~~~~~~~~~~~~~~~~
Would you like an HTML report, or a plain text report?
Enter 'html' for an HTML report, or 'text' for plain text
Defaults to 'html'
Enter value for report_type: text
Type Specified: text
Instances in this Workload Repository schema
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
DB Id Inst Num DB Name Instance Host
* 4174002554 1 RMSORA rmsora RMSORA1
Using 4174002554 for database Id
Using 1 for instance number
Specify the number of days of snapshots to choose from
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Entering the number of days (n) will result in the most recent
(n) days of snapshots being listed. Pressing <return> without
specifying a number lists all completed snapshots.
Listing the last 3 days of Completed Snapshots
Snap
Instance DB Name Snap Id Snap Started Level
rmsora RMSORA 16186 16 Mar 2006 17:33 1
16187 16 Mar 2006 18:00 1
16206 17 Mar 2006 03:30 1
16207 17 Mar 2006 04:00 1
16208 17 Mar 2006 04:30 1
16209 17 Mar 2006 05:00 1
16210 17 Mar 2006 05:31 1
16211 17 Mar 2006 06:00 1
16212 17 Mar 2006 06:30 1
16213 17 Mar 2006 07:00 1
16214 17 Mar 2006 07:30 1
16215 17 Mar 2006 08:01 1
16216 17 Mar 2006 08:30 1
16217 17 Mar 2006 09:00 1
Specify the Begin and End Snapshot Ids
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Enter value for begin_snap: 16216
Begin Snapshot Id specified: 16216
Enter value for end_snap: 16217
End Snapshot Id specified: 16217
Specify the Report Name
~~~~~~~~~~~~~~~~~~~~~~~
The default report file name is awrrpt_1_16216_16217.txt. To use this name,
press <return> to continue, otherwise enter an alternative.
Benefit:- Now DBA have more free time to play games.....................:-)
Advance version of statspack
more DB and OS information with self managing capabilty
New Automatic alert and database advisor with the help of AWR.
6.Active Session History:-
==========================
V$active_session_history is view that contain the recent session history.
the memory for ASH is comes from SGA and it can't more then 5% of Shared pool.
So we can get latest and active session report from v$active_session_history view and also get histortical data of
of session from DBA_HIST_ACTIVE_SESS_HISTORY.
v$active_session_history include some imp column like:-
~SQL identifier of SQL statement
~Object number, file number, and block number
~Wait event identifier and parameters
~Session identifier and session serial number
~Module and action name
~Client identifier of the session
7.Misc:-
========
Rename Tablespace:-
=================
in 10g,we can even rename a tablespace by
alter tablespace <tb_name> rename to <tb_name_new>;
This command will update the controlfile,data dictionary and datafile header,but dbf filename will be same.
**we can't rename system and sysaux tablespace.
Bigfile tablespace:-
====================
Bigfile tablespace contain only one datafile.
A bigfile tablespace with 8K blocks can contain a 32 terabyte datafile.
Bigfile tablespaces are supported only for locally managed tablespaces with automatic segment-space management.
we can take the advantage of bigfile tablespace when we are using ASM or other logical volume with RAID.
without ASM or RAID ,it gives poor response.
syntax:-
CREATE BIGFILE TABLESPACE bigtbs
Flushing Buffer Cache:-
======================
This option is same as flushing the shared pool,but only available with 10g.
but i don't know, whats the use of this command in prod database......
anyway we can check and try it on test server for tuning n testing some query etc....
SQL> alter system flush buffer_cache;
System altered.
++++++++++++++++++
8.Oracle Internal
++++++++++++++++++
Here is some stuff that is not related with 10g but have some intresting things.
a)undocumented parameter "_log_blocks_during_backup"
++++++++++++++++++++++++
as we know that oracle has generate more redo logs during hotbackup mode because
oracle has to maintain the a complete copy of block into redolog due to split block.
we can also change this behaviour by setting this parameter to False.
If Oracle block size equals the operating system block size.thus reducing the amount of redo generated
during a hot backup.
WITHOUT ORACLE SUPPORT DON'T SET IT ON PROD DATABASE.THIS DOCUMENT IS JUST FOR INFORMATIONAL PURPOSE.
b)some X$ views (X$messages)
++++++++++++++++
if you are intresting in oracle internal architecture then x$ view is right place for getting some intresting things.
X$messages :-it show all the actions that a background process do.
select * from x$messages;
like:-
lock memory at startup MMAN
Memory Management MMAN
Handle sga_target resize MMAN
Reset advisory pool when advisory turned ON MMAN
Complete deferred initialization of components MMAN
lock memory timeout action MMAN
tune undo retention MMNL
MMNL Periodic MQL Selector MMNL
ASH Sampler (KEWA) MMNL
MMON SWRF Raw Metrics Capture MMNL
reload failed KSPD callbacks MMON
SGA memory tuning MMON
background recovery area alert action MMON
Flashback Marker MMON
tablespace alert monitor MMON
Open/close flashback thread RVWR
RVWR IO's RVWR
kfcl instance recovery SMON
c)Internal Structure of Controlfile
++++++++++++++++++++++++++++++++++++
The contents of the current controlfile can be dumped in text form.
Dump Level Dump Contains
1 only the file header
2 just the file header, the database info record, and checkpoint progress records
3 all record types, but just the earliest and latest records for circular reuse record types
4 as above, but includes the 4 most recent records for circular reuse record types
5+ as above, but the number of circular reuse records included doubles with each level
the session must be connected AS SYSDBA
alter session set events 'immediate trace name controlf level 5';
This dump show lots of intresting information.
it also show rman recordes if we used this controlfile in rman backup.
Thanks
Kuljeet Pal Singh

You can find each doc in html and pdf format on the Documentation Library<br>
You can too download all the documentation in html format to have all on your own computer here (445.8MB)<br>
<br>
Nicolas.

Another Error (I think) In the 12.1 New Features Guide

Under section 1.5.9.8 Storage Snapshot Optimization:
The first bullet point is: "Database crash is consistent at the point of the snapshot."
I think that is supposed to be: "Database is crash-consistent at the point of the snapshot."
At the very least, that seems to make more sense to me. Googling around, there was a document on these features by EMC with that wording.

Thanks for that comment. I have sent a pointer to it to the writer for that book. Note that with the New Features Guide, most of the content is automatically drawn from an internal system that tracks projects and features; so if a change is needed, the writer will notify the owner of that content (typically a developer or a product manager) to investigate and (if necessary) modify the underlying data, after which the changed information will be picked up for a future revision of the book.
Also, while anyone is welcome to enter documentation comments in this forum, another option that may be more convenient for comments on specific sections is the Reader Comment area at the bottom of each HTML page (such as http://docs.oracle.com/cd/E16655_01/server.121/e17906/chapter1.htm#NEWFT495 for the page containing Section 1.5.9.8). Any comments entered in a Reader Comment area go to someone in our documentation production group, who forwards them to the appropriate writers.
However, if a comment involves multiple HTML pages or books, or if you want the matter to be in a public forum for visibility and searchability, posting in this forum is a good option.

New feature BD87 in ECC 6.0 ?

Hi,
In the first screen of BD87 that you see with all your idocs we see message: "Could not find soldto belonging to &"
I we double-click on the message, it give several idocs with the same error, but only then the & has the correct value filled in.
Is this a new feature of the BD87 in ECC 6.0 ? That is't maybe grouping on messages to get a better overview ?
Thanks !

Dear Soniya,
Release Info:
http://help.sap.com/saphelp_erp2005/helpdata/en/43/68805bb88f297ee10000000a422035/frameset.htm
http://solutionbrowser.erp.sap.fmpmedia.com/ Give source and target versions.
Regards,
Naveen.

Top 100 new features in Iphone 3.0

Top 100 new features in iPhone 3.0
The full 100+ new features in iPhone 3.0 software...
1. Cut/Paste 
2. Copy/Paste 
3. Shake to undo/redo typing 
4. Text selection for easy mass deletion 
5. MMS 
6. Landscape keyboard in Notes 
7. Landscape keyboard in Mail 
8. Landscape keyboard in Messages 
9. Forward texts or picture messages 
10. Delete individual texts or picture messages 
11. Sending progress bar in Messages app moved to title instead of over the keyboard area (allows typing new message while the first one is sending)
12. USB tethering 
13. Bluetooth tethering 
14. Stereo bluetooth (A2DP) 
15. Spotlight search (searches all app titles, mail, media, contact details, and calendar appointments) 
16. Search in Notes 
17. Search in Mail 
18. Search in iPod 
19. In-App purchases 
20. Option to have double clicking the home button go to the Spotlight Search 
21. Option to have double clicking the home button go to the Camera 
22. Preview icon in lower left hand corner for last shot taken in Camera app 
23. Shake to shuffle in iPod 
24. Scrolling of screenshots in App Store 
25. Type of phone used under each call in Recents (i.e., mobile, home, work, etc.) 
26. Call history log (including call duration) 
27. Option to Share Contact in each contact listing 
28. Hold link in Safari to Copy 
29. Hold link in Safari to Open in New Page 
30. Auto Fill contact information, usernames and passwords in Safari 
31. Login to your YouTube account 
32. See Comments in YouTube 
33. Subscribe in YouTube 
34. Rate in YouTube 
35. Shake to undo what you have typed 
36. Option to retry sending failed text messages, indicated by red exclamation point next to text 
37. Turn-by-turn GPS capabilities 
38. Maps can be run inside other applications 
39. Access to dock port for accessories to communicate 
40. Peer-to-peer connectivity using Bluetooth (no Wi-Fi required) 
41. New Voice memo application 
42. Extended Parental controls 
43. Anti-phishing 
44. Wi-Fi auto login 
45. Note syncing in iTunes 
46. Improved Stocks app 
47. New calendar types (CalDAV) 
48. Prompt to confirm deleting a note 
49. Prompt to confirm deleting a photo 
50. Option to select multiple photos to attach to an email 
51. “Find My iPhone” option for MobileMe users 
52. Unlimited size podcast downloads over 3G 
53. Pushing home button on first home screen takes user to Spotlight 
54. Pushing home button on Spotlight takes user to first home screen 
55. Variable speed playback for audio books 
56. App Store subscriptions 
57. Push notifications 
58. Audio/Video tags 
59. New video streaming capabilities (HTML 5 video, h.264 and HTTP) 
60. Calendar subscriptions 
61. iTunes login 
62. iTunes account creation 
63. Encypted profiles 
64. LDAP (directory services) 
65. VPN on-demand 
66. EAP SIM 
67. Proxy support 
68. OTA profiles 
69. Revoke certificates 
70. Exchange ActiveSync Policies 
71. Media scrubber 
72. More languages 
73. Improved keyboards 
74. Failed app updates now are shown in a duplicate icon and labeled “Paused” 
75. When selecting multiple emails to forward/delete, any unread emails’ blue dot are shown next to the red selector dot instead of being overridden by the red selector dot 
76. Non-contact phone calls list their city and state of origin in Recents and Visual Voicemail under the number. 
77. Ability to change ringtones straight from Favorites 
78. Lap time display now displayed smaller and above time in Stopwatch 
79. Polished Phone, Messages, and iPod icons 
80. Swipe to delete notes in the Notes app 
81. Advanced Bluetooth options for Handsfree devices 
82. Option to close a single web page in Safari page view, which immediately opens a new blank page 
83. Improved predictive dictionary 
84. Blue dot now displayed in center of location circle in Maps (V1 only) 
85. Listening to music while charging the battery now displays the album art instead of the battery 
86. Smaller font for song title on lock screen 
87. Option in Phone Settings to choose your phone number 
88. Option to disable text message reminder alerts 
89. Option to disable text message previews 
90. Option to show subject field in text messages 
91. Ability to integrate iPod music into apps 
92. Clickable email links in App Store app descriptions 
93. JavaScript 3x speed boost 
94. 11 homescreens now allowed 
95. Reboots to “slide to unlock” screen instead of homescreen 
96. In Settings>General>Home>Search Results, users can choose what is searched on the phone and in what order. 
97. Application count added in Settings>General>About 
98. Option “Load Remote Images” added in Mail settings 
99. Global address book option available if Exchange account is set up 
100. Speed control in audiobooks 
101. 30 second repeat option for audiobooks 
102. Improved scrubbing speeds when holding white dot in song progress bar in iPod 
103. When sending a text, your text box where you typed smoothly fades from white to green instead of instantly changing from white to green. 
104. When moving an app across homescreens, holding the app on either the left or right side will slowly advance the app one through one homescreen at a time, without leaving empty spots in the bottom right corner or each homescreen it advances through. 
105. Album name displayed on lockscreen iPod controls 
106. Shake to shuffle on lockscreen iPod controls 
107. Podcasts saved on iPhone now show Run Time, Time Left and Date Published 
108. Screen goes from dimmed to full brightness after each song when playing the iPod while plugged in 
109. WAVE file support in Mail 
110. Attachment no longer automatically downloaded until user taps the attachment in Mail 
111. When using a bluetooth headset with iPod, volume bar is removed and bluetooth headset name is displayed in its place. 
112. A hard reset on your phone (holding sleep and home for 10 seconds) now turns it off instead of restarting it.
113. A space is no longer needed between two words for predictive texting to function.

I am glad there was a copy paste added but it would have been nice to use your own ringtones and I don't understand why they could not use gps for the direction of the phone too.
I am sure if they can pinpoint you on the map they could tell what direction your holding the phone on the 3g.
The cam is very poor on the 3g phone it,s more like an afterthought.
I don't understand why apple did not have the function of moving your photos and ringtones with drag and drop onto itunes rather than sync to a folder.
yes there are apps you can buy but even a £20 phone lets you do all of above without added cost to the user.
and where is the software reset for clearing the memory or is that an afterthought too.
PS not picking holes it's a fact.
The HTC phone is a nice phone mate has one.

ITunes 11.0 First Impressions

1. My first impression of the user interface is that it's "square" and "flat".
   Esthetically I don't see it as an improvement. To the contrary, I think
   the former interface is nicer.
2. After starting iTunes 11.0 it sat there for 1/2 an hour with the message
   "Sending Information to Apple", then a dialog box displayed with:
   We cannot complete your iTunes Store request
   An unknown error occurred (4002)
   Note that three subsequent attempts resulted in the same iTunes match error.
3. Could not find a way to change the BRIGHT WHITE background. I hate the white
   background for various reasons. I'm sure many other customers preferred the dark
    background as well.
4. Tried syncing my iPhone and had to cancel. It was copying 49 apps, I believe
   some of these were from my iPad. Had to then restart iTunes.
5. Movies in grid view have large gaps in between the rows of movies.
   It is UGLY! Is it just me, or do others have these huge gaps?
6. Looking at my music, I see no way to view the songs in a list view.
   Where are the convenient buttons which quickly allowed changing views?
   Now there is just unused space where they used to be. And all of
   the menu items under View -> Column Browser are disabled.
   Why???
7. Hey, at least they brought back color icons, which Apple deemed that
   no one liked! (That was sarcasm).
Overall I am extremely dissapointed with this update, and it has me wondering how the
most valuable company in the world could release something that looks more at home
on a Linux desktop.

It's terrible. There is no symmetry in the views anymore. It is so bad, that it will take a lot of testing for me to figure out what is wrong with it. The only view that allows different views is the playlist view. I can't get an "artist list" for all my music. I can only get it for the currently selected playlist. I suppose I could make a playlist with all music. Where did sort by album by artist/year go? That's the view I used the most. I found it in the songs view. But there I can't see the album covers. It's so unsymmetrical now. Where did the status bar go that told me how many songs I selected and what the total play time is? I don't know if all my songs are there. The albums view and the videos views are worthless if you have 15,000 songs and videos. They just rearranged things. There's nothing new. There are things missing. The thing that needed fixing was synchronization. All that should be removed from iTunes, but they didn't make any changes to that. Can I go back to iTunes 10?

BLOCK CORRUPTION (ORA-1578) 처리 (ORACLE 8I NEW FEATURE)

제품 : ORACLE SERVER
작성날짜 : 2002-05-31
BLOCK CORRUPTION (ORA-1578) 처리 (ORACLE 8I NEW FEATURE)
========================================================
PURPOSE
Block Corruption의 처리 방안에 대해 알아본다.
Problem Description
block corruption 시 10210, 10211,10231 의 event 를 사용해서
해당 block 을 skip 할 수도 있지만 V8.1 이상에서는
dbms_repair.fix_corrupt_blocks ,
dbms_repair.skip_corrupt_block 를 이용하여
corrupt가 발생한 block을 detect하고 skip, 또는 repair해주는 방안이
제시되고 있다.
Workaround
Solution Description
- 먼저 detecting 을 위해 db_block_checking =true 를 init.ora 에 set
- dbms_repair 의 package 를 사용하는데 이 package 는 dbmsrpr.sql,
prvtrpr.plb를 수행한다 .
- sys 로 접속하여 package 를 실행한다.
다음의 예제를 살펴보자
T1 테이블에 corrupt 된 block 이 있다고 가정한다.
SQL> desc t1
Name Null? Type
COL1 NOT NULL NUMBER(38)
COL2 CHAR(512)
SQL> analyze table t1 validate structure;
analyze table t1 validate structure
ERROR at line 1:
ORA-01498: block check failure - see trace file
이때 ANALYZE로 부터 발생된 trace file 에 corrupt 된 block 에 3 row 의
(nrows = 3) data 가 있음을 알수 있다고 가정하자.
DBMS_REPAIR.ADMIN_TABLES (repair and orphan key)
================================================
ADMIN_TABLES 은 table 을 위한 repair table과,인덱스를 위한 orphan key
tables을 제공한다.
SQL> @adminCreate
SQL> connect sys/change_on_install
Connected.
SQL>
SQL> -- Repair Table
SQL>
SQL> declare
2 begin
3 -- Create repair table
4 dbms_repair.admin_tables (
5 -- table_name => 'REPAIR_TABLE',
6 table_type => dbms_repair.repair_table,
7 action => dbms_repair.create_action,
8 tablespace => 'USERS'); -- default TS of SYS if not specified
9 end;
10 /
PL/SQL procedure successfully completed.
SQL> select owner, object_name, object_type
2 from dba_objects
3 where object_name like '%REPAIR_TABLE';
OWNER OBJECT_NAME OBJECT_TYPE
SYS DBA_REPAIR_TABLE VIEW
SYS REPAIR_TABLE TABLE
SQL>
SQL> -- Orphan Key Table
SQL>
SQL> declare
2 begin
3 -- Create orphan key table
4 dbms_repair.admin_tables (
5 table_type => dbms_repair.orphan_table,
6 action => dbms_repair.create_action,
7 tablespace => 'USERS'); -- default TS of SYS if not specified
8 end;
9 /
PL/SQL procedure successfully completed.
SQL> select owner, object_name, object_type
2 from dba_objects
3 where object_name like '%ORPHAN_KEY_TABLE';
OWNER OBJECT_NAME OBJECT_TYPE
SYS DBA_ORPHAN_KEY_TABLE VIEW
SYS ORPHAN_KEY_TABLE TABLE
DBMS_REPAIR.CHECK_OBJECT
=========================
CHECK_OBJECT procedure 는 기술된 object를 check 하고, repair 를 위한 정보를 수집하기 위함이다.
SQL> @checkObject
SQL> set serveroutput on
SQL>
SQL> declare
2 rpr_count int;
3 begin
4 rpr_count := 0;
5 dbms_repair.check_object (
6 schema_name => 'SYSTEM',
7 object_name => 'T1',
8 repair_table_name => 'REPAIR_TABLE',
9 corrupt_count => rpr_count);
10 dbms_output.put_line('repair count: ' || to_char(rpr_count));
11 end;
12 /
repair count: 1
PL/SQL procedure successfully completed.
SQL> desc repair_table
Name Null? Type
OBJECT_ID NOT NULL NUMBER
TABLESPACE_ID NOT NULL NUMBER
RELATIVE_FILE_ID NOT NULL NUMBER
BLOCK_ID NOT NULL NUMBER
CORRUPT_TYPE NOT NULL NUMBER
SCHEMA_NAME NOT NULL VARCHAR2(30)
OBJECT_NAME NOT NULL VARCHAR2(30)
BASEOBJECT_NAME VARCHAR2(30)
PARTITION_NAME VARCHAR2(30)
CORRUPT_DESCRIPTION VARCHAR2(2000)
REPAIR_DESCRIPTION VARCHAR2(200)
MARKED_CORRUPT NOT NULL VARCHAR2(10)
CHECK_TIMESTAMP NOT NULL DATE
FIX_TIMESTAMP DATE
REFORMAT_TIMESTAMP DATE
SQL> select object_name, block_id, corrupt_type, marked_corrupt,
2 corrupt_description, repair_description
3 from repair_table;
OBJECT_NAME BLOCK_ID CORRUPT_TYPE MARKED_COR
CORRUPT_DESCRIPTION
REPAIR_DESCRIPTION
T1 3 1 FALSE
kdbchk: row locked by non-existent transaction
table=0 slot=0
lockid=32 ktbbhitc=1
mark block software corrupt
Data Extraction
===============
repair table에 의하면 file 6 ,block 3 에 corrupt 이 났음을 알수 있다
그러나 아직 이 block 은 corrupt 로 mark 되어 있지 않으므로 필요 data 를
추출하여야 한다.
1. ALTER SYSTEM DUMP (nrows = 3) 에 의해 block안에 있는 row수를 결정한다.
2. corrupt object를 select 하여 가능한 정보를 추출한다.
SQL> -- The following query can be used to salvage data from a corrupt block.
SQL> -- Creating a temporary table facilitates data insertion.
SQL> create table temp_t1 as
2 select * from system.t1
3 where dbms_rowid.rowid_block_number(rowid) = 3
4 and dbms_rowid.rowid_to_absolute_fno (rowid, 'SYSTEM','T1') = 6;
Table created.
SQL> select col1 from temp_t1;
COL1
2
3
DBMS_REPAIR.FIX_CORRUPT_BLOCKS (ORA-1578)
============================================
FIX_CORRUPT_BLOCKS procedure는 repair table 의 정보를 이용하여 corrupt
blocks 을 fix 한다
그러나 아직 full table scan 시 여전히 error 가 발생한다
SQL> declare
2 fix_count int;
3 begin
4 fix_count := 0;
5 dbms_repair.fix_corrupt_blocks (
6 schema_name => 'SYSTEM',
7 object_name => 'T1',
8 object_type => dbms_repair.table_object,
9 repair_table_name => 'REPAIR_TABLE',
10 fix_count => fix_count);
11 dbms_output.put_line('fix count: ' || to_char(fix_count));
12 end;
13 /
fix count: 1
PL/SQL procedure successfully completed.
SQL> select object_name, block_id, marked_corrupt
2 from repair_table;
OBJECT_NAME BLOCK_ID MARKED_COR
T1 3 TRUE
SQL> select * from system.t1;
select * from system.t1
ERROR at line 1:
ORA-01578: ORACLE data block corrupted (file # 6, block # 3)
ORA-01110: data file 6: '/tmp/ts_corrupt.dbf'
DBMS_REPAIR.DUMP_ORPHAN_KEYS
==============================
DUMP_ORPHAN_KEYS는 corrupt data 에 해당하는 index 를 나타내 준다
SQL> select index_name from dba_indexes
2 where table_name in (select distinct object_name from repair_table);
INDEX_NAME
T1_PK
SQL> @dumpOrphanKeys
SQL> set serveroutput on
SQL>
SQL> declare
2 key_count int;
3 begin
4 key_count := 0;
5 dbms_repair.dump_orphan_keys (
6 schema_name => 'SYSTEM',
7 object_name => 'T1_PK',
8 object_type => dbms_repair.index_object,
9 repair_table_name => 'REPAIR_TABLE',
10 orphan_table_name => 'ORPHAN_KEY_TABLE',
11 key_count => key_count);
12 dbms_output.put_line('orphan key count: ' || to_char(key_count));
13 end;
14 /
orphan key count: 3
PL/SQL procedure successfully completed.
SQL> desc orphan_key_table
Name Null? Type
SCHEMA_NAME NOT NULL VARCHAR2(30)
INDEX_NAME NOT NULL VARCHAR2(30)
IPART_NAME VARCHAR2(30)
INDEX_ID NOT NULL NUMBER
TABLE_NAME NOT NULL VARCHAR2(30)
PART_NAME VARCHAR2(30)
TABLE_ID NOT NULL NUMBER
KEYROWID NOT NULL ROWID
KEY NOT NULL ROWID
DUMP_TIMESTAMP NOT NULL DATE
SQL> select index_name, count(*) from orphan_key_table
2 group by index_name;
INDEX_NAME COUNT(*)
T1_PK 3
Note: orphan key table의 index 는 다시 rebuild 되어야 한다.
DBMS_REPAIR.SKIP_CORRUPT_BLOCKS
===============================
SKIP_CORRUPT_BLOCKS 은 table 과 index 의 corrupt block 을 skip 하는 것을 enable/disable 을 실시한다.
Suggestion: SKIP_CORRUPT_BLOCKS 가 enabled되면 orphan key table의 모든
index 는 모두 rebuild 되어야 한다. ( all index associated with object
if DUMP_ORPHAN_KEYS was omitted).
SQL> @skipCorruptBlocks
SQL> declare
2 begin
3 dbms_repair.skip_corrupt_blocks (
4 schema_name => 'SYSTEM',
5 object_name => 'T1',
6 object_type => dbms_repair.table_object,
7 flags => dbms_repair.skip_flag);
8 end;
9 /
PL/SQL procedure successfully completed.
SQL> select table_name, skip_corrupt from dba_tables
2 where table_name = 'T1';
TABLE_NAME SKIP_COR
T1 ENABLED
SQL> -- rows in corrupt block skipped, no errors on full table scan
SQL> select * from system.t1;
COL1 COL2
4 dddd
5 eeee
--> Notice the pk index has not yet been corrected.
SQL> insert into system.t1 values (1,'aaaa');
insert into system.t1 values (1,'aaaa')
SQL> select * from system.t1 where col1 = 1;
no rows selected
DBMS_REPAIR.REBUILD_FREELISTS
===============================
REBUILD_FREELISTS rebuilds freelists for the specified object.
SQL> declare
2 begin
3 dbms_repair.rebuild_freelists (
4 schema_name => 'SYSTEM',
5 object_name => 'T1',
6 object_type => dbms_repair.table_object);
7 end;
8 /
PL/SQL procedure successfully completed.
Rebuild Index
=============
Note: Every index identified in the orphan key table should be rebuilt to
ensure consistent results.
SQL> alter index system.t1_pk rebuild online;
Index altered.
SQL> insert into system.t1 values (1, 'aaaa');
1 row created.
SQL> select * from system.t1;
COL1 COL2
4 dddd
5 eeee
1 aaaa
Reference Document
------------------

Try look to alert<SID>.log file for full error report (you could paste it here).
Also from alert log you could get real values for db_block_buffers and shared_pool_size parameters that used during instance startup.

MULTIPLE ARCHIVER PROCESSES FAQ ( ORACLE 8I NEW FEATURE )

제품 : ORACLE SERVER
작성날짜 : 2002-04-19
MULTIPLE ARCHIVER PROCESSES FAQ ( ORACLE 8I NEW FEATURE )
=========================================================
PURPOSE
1. LOG_ARCHIVE_MAX_PROCESSES가 하는 역할
2. LOG_ARCHIVE_MAX_PROCESSES 값은 동적으로 변경 가능한지 여부
3. Archiver process의 갯수가 동적으로 바뀌는 메카니즘
4. 어떤 archiver process가 online log를 archive시켰는지 판단 방법
Explanation
1. LOG_ARCHIVE_MAX_PROCESSES가 하는 역할
Oracle 8i에는 다중 archive destination을 지원하며, 단일 archiver의
부하를 줄여주기 위해 multiple archiver process를 사용할 수 있다.
LOG_ARCHIVE_MAX_PROCESSES 파라미터로 구동시킬 최대 ARCH 프로세스의
갯수를 지정하면 된다.
만약 LOG_ARCHIVE_START 값이 TRUE로 지정되어 있다면 인스턴스 구동시
init 파일에 지정된 LOG_ARCHIVE_MAX_PROCESSES에 지정된 값을 읽어
들인다. 만약 LOG_ARCHIVE_START 값이 true인데 LOG_ARCHIVE_MAX_PROCESSES
값이 별도로 지정되어 있지 않을 경우에는 arc0 프로세스만을 구동시킨다.
LOG_ARCHIVE_MAX_PROCESSES 값이 별도로 지정되었을 경우 (1 - 10 범위),
arc0, arc1 과 같은 추가 프로세스를 구동시킨다.
하지만, 이 파라미터 값을 기본값 1이 아닌 다른 값으로 명시적으로 지정할
필요는 없다. 왜냐하면, 시스템에서 몇개의 ARCn 프로세스가
필요한지를 판단하여, 추가 ARCn 프로세스를 생성하기 때문이다.
2. LOG_ARCHIVE_MAX_PROCESSES 값은 동적으로 변경 가능한지 여부
alter system 명령에서 set LOG_ARCHIVE_MAX_PROCESSES=n 으로
지정하여 동적으로 값을 변경할 수 있다. 이때 n은 1 부터 10사이의
값이어야 한다. 하지만, LOG_ARCHIVE_START 값이 FALSE로 지정되어
있을 경우에는, 명령을 실행시켜도 아무런 영향을 미치지
못한다.
3. Archiver process의 갯수가 동적으로 바뀌는 메카니즘
만약 LOG_ARCHIVE_START 값이 TRUE로 지정되어 있다면, 오라클에서는
구동시 하나의 archiver process (ARC0)를 구동시킨다. 이 파라미터
값은 필요시 LATER SYSTEM 명령으로 지정된 갯수만큼의
archive process를 구동시킬 수 있다.
예)
SVRMGRL>alter system set LOG_ARCHIVE_MAX_PROCESSES=4;
위 명령을 실행 시키면 다음과 같은 절차에 따라 ARC1, ARC2, ARC3를
추가한다.
1) Shadow process는 primary archive process에게 프로세스 갯수를
늘릴 것을 요청한다.
2) Archiver process는 kcrrschd 함수를 호출한다. (kcrrschd:
다중 arch process를 schedule)
3) 만약 요청된 process의 갯수가 현재 사용중인 archiver process
갯수보다 작은지 확인한다. 만약 새로 지정된 값이 적거나, ARCHIVING이
DISABLE 된 상태라면 다른 조치를 취하지 않고 return 한다. 그렇지
않다면 지원되는 최대 갯수인 10을 넘는지 확인하고 10을 넘을 경우에는
프로세스의 갯수를 10으로 지정한다.
4) Scheduler 함수는 kcrxs{} structure에 대한 latch를 확보한다.
여기서 kcrxs{} structure는 ARCH Activation status를 나타낸다.
5) Scheduler 함수는 지정된 process 갯수 만큼 loop를 돌면서
schedule된 상태를 structure KCRRSCHED에 반영시킨다.
6) 그리고 나서 latch를 release 시킨 후 kcrrsmp 함수를 ( kcrrsmp:
다중 arch processs 구동 ) 호출한다.
7) kcrrsmp 함수는 kcrrxs{} structure (ARCH 구동 상태)에 대한 latch를
확보하여 code 실행을 serialize 시켜 이 함수가 동시에 실행되더라도
한번에 하나씩 실행될 수 있도록 한다.
8) pending 상태에 있는 archiver process를 스케쥴링 하고, dead process가
있으면 clean up 시킨다.
9) 그리고 나서 이 함수는 지정된 process 갯수 만큼 loop를 돌면서
KCRRSCHED 상태를 KCRRSTART으로 바꾸어, archiver process들을
구동 준비 상태로 만든다.
10) latch를 release 시킨 후 ARCH 프로세스를 구동시킨다.
11) kcrrsmp함수는 latch를 다시 획득한다. 각각의 archiver 프로세스는
자기 자신을 activate 시킬 것을 통보 받는다. archiver process는
자기 자신을 activate 시킨 후 alert file에 관련 사항을 기록한다.
12) 호출을 하는 함수는 모든 archiver process가 자기 자신을
activate 시키고, kcrrxs structure의 내용을 갱신할 때 까지
sleep 상태에서 대기한다.
13) 끝으로, 현재 archiver process의 갯수가 요청된 archiver process
의 갯수와 일치 하면, latch를 release 시키고 break 한다. ( C
에서의 break )
alert. log 에는 위 과정이 다음과 같이 반영된다.
sql: prodding the archiver
ALTER SYSTEM SET log_archive_max_processes=4;
Tue Jul 13 02:15:14 1999
ARC0: changing ARC1 KCRRNOARCH->KCRRSCHED
ARC0: changing ARC2 KCRRNOARCH->KCRRSCHED
ARC0: changing ARC3 KCRRNOARCH->KCRRSCHED
ARC0: STARTING ARCH PROCESSES
ARC0: changing ARC1 KCRRSCHED->KCRRSTART
ARC0: changing ARC2 KCRRSCHED->KCRRSTART
ARC0: changing ARC3 KCRRSCHED->KCRRSTART
ARC0: invoking ARC1
Tue Jul 13 02:15:15 1999
ARC1: changing ARC1 KCRRSTART->KCRRACTIVE
Tue Jul 13 02:15:15 1999
ARC0: Initializing ARC1
ARC0: ARC1 invoked
ARC0: invoking ARC2
ARC1 started with pid=10
ARC1: Archival started
Tue Jul 13 02:15:15 1999
ARC2: changing ARC2 KCRRSTART->KCRRACTIVE
Tue Jul 13 02:15:15 1999
ARC0: Initializing ARC2
ARC2 와 ARC3도 동일한 절차를 따른다.
흥미로운 사실은 프로세스의 갯수를 줄일 수도 있다는 것이다. 예를 들어
다음과 같은 명령을 실행시킬 경우
SVRMGRL>alter system set LOG_ARCHIVE_MAX_PROCESSES=2;
다음과 같은 작업이 순서대로 실행된다.
1) shadow process는 현재 active 상태인 archiver process와 접속을 한다.
2) archiverprocess는 kcrrxmp 함수를 호출한다. ( kcrrxmp: 다중
Arch process 정지 )
3) kcrrxmp 함수는 kcrrxs{} structure에 (ARCH 구동 상태) 대한 latch를 획득하여 다른 프로세스에서 structure를 동시에 병경하지 않도록 한다.
4) 새로 요청된 archiver process의 갯수가 현재 사용중인 archiver process
의 갯수보다 작은지 확인한다.
5) 만약 작다면, archiver process 목록 가운데, 가장 최근에 schedule
되어, archival 작업에 schedule 차례가 금방 돌아 오지 않을 프로세스를
찾아낸다.
6) 각각의 프로세스에 대해 KCRRACTIVE 상태에서 KCRRSHUTDN로 상태를
변경할 것을 요청한다.
7) 상태가 바뀌면, OS에서 해당 프로세스를 종료시키도록 하고, 상태를
KCRRDEAD로 바꾼다. 관련된 상태 정보가 정리되고 kcrrxs{} structure의
내용이 갱신된다.
6) ,7) 과정은 지정된 archiver process 갯수로 줄어들 때 까지
반복된다.
8) 새로운 archiver process의 갯수로 kcrrxs structure 내용이 갱신된다.
9) latch를 release 시킨다.
상태 변동은 다음과 같이 alert. log 파일에 반영된다.
sql: prodding the archiver
Tue Jul 13 00:34:20 1999
ARC3: changing ARC0 KCRRACTIVE->KCRRSHUTDN
ARC3: sending ARC0 shutdown message
ARC3: changing ARC1 KCRRACTIVE->KCRRSHUTDN
ARC3: sending ARC1 shutdown message
ARC3: received prod
Tue Jul 13 00:34:20 1999
ALTER SYSTEM SET log_archive_max_processes=2;
Tue Jul 13 00:34:20 1999
ARCH shutting down
ARC0: Archival stopped
ARC0: changing ARC0 KCRRSHUTDN->KCRRDEAD
Tue Jul 13 00:34:20 1999
ARCH shutting down
ARC1: Archival stopped
ARC1: changing ARC1 KCRRSHUTDN->KCRRDEAD
4. 어떤 archiver process가 online log를 archive시켰는지 판단 방법
Archiver process는 round-robin 방식으로 archiving 작업을 수행하도록
schedule 된다. 만약 다중 archiver process가 부하에 따라 activate 된
경우는 여러가지 경우의 수가 있을 수 있다. Oracle 8i에서는 다중
archive log dest를 지원하면서 archive log에 대한 duplexing을 지원
하기 때문에, 어떤프로세스가 log file을 archive 시켰는지를 기록할 필요가
있다.
Oracle 8i에서 archival 작업은 성공할 때 마다 trace file에 archiver
process 명을 기록한다.
다음은 관련 trace file의 주요 내용이다.
Instance name: v815
Redo thread mounted by this instance: 1
Oracle process number: 12
Unix process pid: 3658, image: oracle@oracle8i (ARC3)
*** Session ID:(12. 1) 1999. 07. 13. 02. 15. 15. 000
*** 1999. 07. 13. 02. 15. 15. 000
*** 1999. 07. 13. 02. 33. 06. 000
ARC3: Begin archiving log# 1 seq# 38 thrd# 1
ARC3: VALIDATE
ARC3: PREPARE
ARC3: INITIALIZE
ARC3: SPOOL
ARC3: Creating archive destination 1 : '/bigdisk/oracle8i/dbs/arch/1_38.
dbf'
ARC3: Archiving block 1 count 1 to : '/bigdisk/oracle8i/dbs/arch/1_38.
dbf'
ARC3: Closing archive destination 1 : /bigdisk/oracle8i/dbs/arch/1_38.
dbf
ARC3: FINISH
ARC3: Archival success destination 1 : '/bigdisk/oracle8i/dbs/arch/1_38.
dbf'
ARC3: COMPLETE, all destinations archived
ARC3: ArchivedLog entry added: /bigdisk/oracle8i/dbs/arch/1_38. dbf
ARC3: ARCHIVED
*** 1999. 07. 13. 02. 33. 06. 000
ARC3: Completed archiving log# 1 seq# 38 thrd# 1
이 정보를 가지고, archive process 3이 log sequence 38번을
destination 1 :/bigdisk/oracle8i/dbs/arch 에 archive 시킨 것을 알 수 있다.
Reference Ducumment
<Note:73163.1>

제품 : ORACLE SERVER
작성날짜 : 2002-04-19
MULTIPLE ARCHIVER PROCESSES FAQ ( ORACLE 8I NEW FEATURE )
=========================================================
PURPOSE
1. LOG_ARCHIVE_MAX_PROCESSES가 하는 역할
2. LOG_ARCHIVE_MAX_PROCESSES 값은 동적으로 변경 가능한지 여부
3. Archiver process의 갯수가 동적으로 바뀌는 메카니즘
4. 어떤 archiver process가 online log를 archive시켰는지 판단 방법
Explanation
1. LOG_ARCHIVE_MAX_PROCESSES가 하는 역할
Oracle 8i에는 다중 archive destination을 지원하며, 단일 archiver의
부하를 줄여주기 위해 multiple archiver process를 사용할 수 있다.
LOG_ARCHIVE_MAX_PROCESSES 파라미터로 구동시킬 최대 ARCH 프로세스의
갯수를 지정하면 된다.
만약 LOG_ARCHIVE_START 값이 TRUE로 지정되어 있다면 인스턴스 구동시
init 파일에 지정된 LOG_ARCHIVE_MAX_PROCESSES에 지정된 값을 읽어
들인다. 만약 LOG_ARCHIVE_START 값이 true인데 LOG_ARCHIVE_MAX_PROCESSES
값이 별도로 지정되어 있지 않을 경우에는 arc0 프로세스만을 구동시킨다.
LOG_ARCHIVE_MAX_PROCESSES 값이 별도로 지정되었을 경우 (1 - 10 범위),
arc0, arc1 과 같은 추가 프로세스를 구동시킨다.
하지만, 이 파라미터 값을 기본값 1이 아닌 다른 값으로 명시적으로 지정할
필요는 없다. 왜냐하면, 시스템에서 몇개의 ARCn 프로세스가
필요한지를 판단하여, 추가 ARCn 프로세스를 생성하기 때문이다.
2. LOG_ARCHIVE_MAX_PROCESSES 값은 동적으로 변경 가능한지 여부
alter system 명령에서 set LOG_ARCHIVE_MAX_PROCESSES=n 으로
지정하여 동적으로 값을 변경할 수 있다. 이때 n은 1 부터 10사이의
값이어야 한다. 하지만, LOG_ARCHIVE_START 값이 FALSE로 지정되어
있을 경우에는, 명령을 실행시켜도 아무런 영향을 미치지
못한다.
3. Archiver process의 갯수가 동적으로 바뀌는 메카니즘
만약 LOG_ARCHIVE_START 값이 TRUE로 지정되어 있다면, 오라클에서는
구동시 하나의 archiver process (ARC0)를 구동시킨다. 이 파라미터
값은 필요시 LATER SYSTEM 명령으로 지정된 갯수만큼의
archive process를 구동시킬 수 있다.
예)
SVRMGRL>alter system set LOG_ARCHIVE_MAX_PROCESSES=4;
위 명령을 실행 시키면 다음과 같은 절차에 따라 ARC1, ARC2, ARC3를
추가한다.
1) Shadow process는 primary archive process에게 프로세스 갯수를
늘릴 것을 요청한다.
2) Archiver process는 kcrrschd 함수를 호출한다. (kcrrschd:
다중 arch process를 schedule)
3) 만약 요청된 process의 갯수가 현재 사용중인 archiver process
갯수보다 작은지 확인한다. 만약 새로 지정된 값이 적거나, ARCHIVING이
DISABLE 된 상태라면 다른 조치를 취하지 않고 return 한다. 그렇지
않다면 지원되는 최대 갯수인 10을 넘는지 확인하고 10을 넘을 경우에는
프로세스의 갯수를 10으로 지정한다.
4) Scheduler 함수는 kcrxs{} structure에 대한 latch를 확보한다.
여기서 kcrxs{} structure는 ARCH Activation status를 나타낸다.
5) Scheduler 함수는 지정된 process 갯수 만큼 loop를 돌면서
schedule된 상태를 structure KCRRSCHED에 반영시킨다.
6) 그리고 나서 latch를 release 시킨 후 kcrrsmp 함수를 ( kcrrsmp:
다중 arch processs 구동 ) 호출한다.
7) kcrrsmp 함수는 kcrrxs{} structure (ARCH 구동 상태)에 대한 latch를
확보하여 code 실행을 serialize 시켜 이 함수가 동시에 실행되더라도
한번에 하나씩 실행될 수 있도록 한다.
8) pending 상태에 있는 archiver process를 스케쥴링 하고, dead process가
있으면 clean up 시킨다.
9) 그리고 나서 이 함수는 지정된 process 갯수 만큼 loop를 돌면서
KCRRSCHED 상태를 KCRRSTART으로 바꾸어, archiver process들을
구동 준비 상태로 만든다.
10) latch를 release 시킨 후 ARCH 프로세스를 구동시킨다.
11) kcrrsmp함수는 latch를 다시 획득한다. 각각의 archiver 프로세스는
자기 자신을 activate 시킬 것을 통보 받는다. archiver process는
자기 자신을 activate 시킨 후 alert file에 관련 사항을 기록한다.
12) 호출을 하는 함수는 모든 archiver process가 자기 자신을
activate 시키고, kcrrxs structure의 내용을 갱신할 때 까지
sleep 상태에서 대기한다.
13) 끝으로, 현재 archiver process의 갯수가 요청된 archiver process
의 갯수와 일치 하면, latch를 release 시키고 break 한다. ( C
에서의 break )
alert. log 에는 위 과정이 다음과 같이 반영된다.
sql: prodding the archiver
ALTER SYSTEM SET log_archive_max_processes=4;
Tue Jul 13 02:15:14 1999
ARC0: changing ARC1 KCRRNOARCH->KCRRSCHED
ARC0: changing ARC2 KCRRNOARCH->KCRRSCHED
ARC0: changing ARC3 KCRRNOARCH->KCRRSCHED
ARC0: STARTING ARCH PROCESSES
ARC0: changing ARC1 KCRRSCHED->KCRRSTART
ARC0: changing ARC2 KCRRSCHED->KCRRSTART
ARC0: changing ARC3 KCRRSCHED->KCRRSTART
ARC0: invoking ARC1
Tue Jul 13 02:15:15 1999
ARC1: changing ARC1 KCRRSTART->KCRRACTIVE
Tue Jul 13 02:15:15 1999
ARC0: Initializing ARC1
ARC0: ARC1 invoked
ARC0: invoking ARC2
ARC1 started with pid=10
ARC1: Archival started
Tue Jul 13 02:15:15 1999
ARC2: changing ARC2 KCRRSTART->KCRRACTIVE
Tue Jul 13 02:15:15 1999
ARC0: Initializing ARC2
ARC2 와 ARC3도 동일한 절차를 따른다.
흥미로운 사실은 프로세스의 갯수를 줄일 수도 있다는 것이다. 예를 들어
다음과 같은 명령을 실행시킬 경우
SVRMGRL>alter system set LOG_ARCHIVE_MAX_PROCESSES=2;
다음과 같은 작업이 순서대로 실행된다.
1) shadow process는 현재 active 상태인 archiver process와 접속을 한다.
2) archiverprocess는 kcrrxmp 함수를 호출한다. ( kcrrxmp: 다중
Arch process 정지 )
3) kcrrxmp 함수는 kcrrxs{} structure에 (ARCH 구동 상태) 대한 latch를 획득하여 다른 프로세스에서 structure를 동시에 병경하지 않도록 한다.
4) 새로 요청된 archiver process의 갯수가 현재 사용중인 archiver process
의 갯수보다 작은지 확인한다.
5) 만약 작다면, archiver process 목록 가운데, 가장 최근에 schedule
되어, archival 작업에 schedule 차례가 금방 돌아 오지 않을 프로세스를
찾아낸다.
6) 각각의 프로세스에 대해 KCRRACTIVE 상태에서 KCRRSHUTDN로 상태를
변경할 것을 요청한다.
7) 상태가 바뀌면, OS에서 해당 프로세스를 종료시키도록 하고, 상태를
KCRRDEAD로 바꾼다. 관련된 상태 정보가 정리되고 kcrrxs{} structure의
내용이 갱신된다.
6) ,7) 과정은 지정된 archiver process 갯수로 줄어들 때 까지
반복된다.
8) 새로운 archiver process의 갯수로 kcrrxs structure 내용이 갱신된다.
9) latch를 release 시킨다.
상태 변동은 다음과 같이 alert. log 파일에 반영된다.
sql: prodding the archiver
Tue Jul 13 00:34:20 1999
ARC3: changing ARC0 KCRRACTIVE->KCRRSHUTDN
ARC3: sending ARC0 shutdown message
ARC3: changing ARC1 KCRRACTIVE->KCRRSHUTDN
ARC3: sending ARC1 shutdown message
ARC3: received prod
Tue Jul 13 00:34:20 1999
ALTER SYSTEM SET log_archive_max_processes=2;
Tue Jul 13 00:34:20 1999
ARCH shutting down
ARC0: Archival stopped
ARC0: changing ARC0 KCRRSHUTDN->KCRRDEAD
Tue Jul 13 00:34:20 1999
ARCH shutting down
ARC1: Archival stopped
ARC1: changing ARC1 KCRRSHUTDN->KCRRDEAD
4. 어떤 archiver process가 online log를 archive시켰는지 판단 방법
Archiver process는 round-robin 방식으로 archiving 작업을 수행하도록
schedule 된다. 만약 다중 archiver process가 부하에 따라 activate 된
경우는 여러가지 경우의 수가 있을 수 있다. Oracle 8i에서는 다중
archive log dest를 지원하면서 archive log에 대한 duplexing을 지원
하기 때문에, 어떤프로세스가 log file을 archive 시켰는지를 기록할 필요가
있다.
Oracle 8i에서 archival 작업은 성공할 때 마다 trace file에 archiver
process 명을 기록한다.
다음은 관련 trace file의 주요 내용이다.
Instance name: v815
Redo thread mounted by this instance: 1
Oracle process number: 12
Unix process pid: 3658, image: oracle@oracle8i (ARC3)
*** Session ID:(12. 1) 1999. 07. 13. 02. 15. 15. 000
*** 1999. 07. 13. 02. 15. 15. 000
*** 1999. 07. 13. 02. 33. 06. 000
ARC3: Begin archiving log# 1 seq# 38 thrd# 1
ARC3: VALIDATE
ARC3: PREPARE
ARC3: INITIALIZE
ARC3: SPOOL
ARC3: Creating archive destination 1 : '/bigdisk/oracle8i/dbs/arch/1_38.
dbf'
ARC3: Archiving block 1 count 1 to : '/bigdisk/oracle8i/dbs/arch/1_38.
dbf'
ARC3: Closing archive destination 1 : /bigdisk/oracle8i/dbs/arch/1_38.
dbf
ARC3: FINISH
ARC3: Archival success destination 1 : '/bigdisk/oracle8i/dbs/arch/1_38.
dbf'
ARC3: COMPLETE, all destinations archived
ARC3: ArchivedLog entry added: /bigdisk/oracle8i/dbs/arch/1_38. dbf
ARC3: ARCHIVED
*** 1999. 07. 13. 02. 33. 06. 000
ARC3: Completed archiving log# 1 seq# 38 thrd# 1
이 정보를 가지고, archive process 3이 log sequence 38번을
destination 1 :/bigdisk/oracle8i/dbs/arch 에 archive 시킨 것을 알 수 있다.
Reference Ducumment
<Note:73163.1>

(V9I) ORACLE 9I NEW FEATURE : ORACLE FLASHBACK

제품 : ORACLE SERVER
작성날짜 : 2002-11-01
(V9I) ORACLE 9I New Feature : ORACLE FLASHBACK
==============================================
PURPOSE
Oracle9i 새로운 기능인 Flashback 의 등장으로 Commit 된 Transaction 에 대해
특정 시점의 과거 DATA를 Query가 가능함으로써 Self-service repair 기능이 향상되었다.
다음 Flashback query 기능과 Setup 방법 및 실제 Data Recovery 에 관한 내용에 대해 알아보도록 한다.
Explanation
Flashback : 새로운 기능인 Flahback 은 과거 시점의 consistent view 를 볼 수있는
기능으로 system time or systme change number(SCN) 기반 read-only view이다.
다음은 Flashback 기능을 사용하기 위해 미리 설정해야할 부분에 대해 알아보도록 한다.
1) 반드시 Automatic Undo Management 에서만 가능
(initSID.ora file이나 spfile에 다음 파라미터가 auto로 설정)
UNDO_MANAGEMENT = AUTO
2) Rentention interval 을 두어 해당 time 동안은 inactive rollback 이라 하더라도
overwrite 되지 않도록 유지(초단위)
SQL> ALTER SYSTEM SET undo_retention = 1200;
UNDO_RETENTION 을 지정한 다음 실제 적용을 위해 5분정도 기다려야 한다.
3) DBMS_FLASHBACK package를 이용하여 Flashback 기능을 enable 시킨다.
SQL> call dbms_flashback.enable_at_time('9-NOV-01:11:00:00');
Example1. Flashback setup 과 date/time 설정
1) Undo tablespace 생성
SQL> create undo tablespace UNDOTBS datafile
'/database/901/V901/undotbs01.dbf' size 100M;
2) intiSID or spfile 에 다음 파라미터 적용
undo_management=auto
undo_retention=1200
undo_tablespace=UNDOTBS
3) dbms_flashback exeucte 권한 grant
SQL> connect / as sysdba
Connected.
SQL> grant execute on dbms_flashback to testuser;
Grant succeeded.
4) test table 생성
SQL> connect testuser/testuser;
Connected.
SQL> create table emp_flash as select * from scott.emp;
Table created.
SQL> select count(*) from emp_flash;
COUNT(*)
15
5) table 생성후 5분 정도 waiting -> table delete
SQL> delete from emp_flash;
15 rows deleted.
SQL> commit;
Commit complete.
SQL> select count(*) from emp_flash;
COUNT(*)
0
6) flashback 활성화
SQL> execute DBMS_FLASHBACK.ENABLE_AT_TIME(sysdate - 5/1440);
PL/SQL procedure successfully completed.
SQL> select count(*) from emp_flash;
COUNT(*)
15
SQL> execute DBMS_FLASHBACK.DISABLE;
PL/SQL procedure successfully completed.
SQL> select count(*) from emp_flash;
COUNT(*)
0
Example2. Flashback 으로 잃어버린 data recovery
1) test user 생성
SQL> connect testuser/testuser;
Connected.
SQL> create table emp_recover as select * from scott.emp;
Table created.
SQL> select count(*) from emp_recover;
COUNT(*)
15
2) delete table
SQL> VARIABLE SCN_SAVE NUMBER;
SQL> EXECUTE :SCN_SAVE := DBMS_FLASHBACK.GET_SYSTEM_CHANGE_NUMBER;
PL/SQL procedure successfully completed.
SQL> PRINT SCN_SAVE
SCN_SAVE
6.4455E+12
SQL> select count(*) from emp_recover;
COUNT(*)
15
SQL> delete from emp_recover;
15 rows deleted.
SQL> commit;
Commit complete.
SQL> select count(*) from emp_recover;
COUNT(*)
0
3) flashback 이용한 data recover
SQL> DECLARE
2 CURSOR FLASH_RECOVER IS
3 select * from emp_recover;
4 emp_recover_rec emp_recover%ROWTYPE;
5 begin
6 DBMS_FLASHBACK.ENABLE_AT_SYSTEM_CHANGE_NUMBER(:SCN_SAVE);
7 open FLASH_RECOVER;
8 DBMS_FLASHBACK.DISABLE;
9 loop
10 FETCH FLASH_RECOVER INTO emp_recover_rec;
11 EXIT WHEN FLASH_RECOVER%NOTFOUND;
12 insert into emp_recover
13 values
14 (emp_recover_rec.empno,
15 emp_recover_rec.ename,
16 emp_recover_rec.job,
17 emp_recover_rec.mgr,
18 emp_recover_rec.hiredate,
19 emp_recover_rec.sal,
20 emp_recover_rec.comm,
21 emp_recover_rec.deptno);
22 end loop;
23 CLOSE FLASH_RECOVER;
24 commit;
25 end;
26 /
PL/SQL procedure successfully completed.
SQL> select count(*) from emp_recover;
COUNT(*)
15
Reference Document
Note. 174425.1
Note. 143217.1
Note. 179851.1

I 'm sorry I can not offer the correct figure since I'm an easy-to-forget guy.
Below is extracted from other's post. wish it helps.
Oracle Security Server ---> 2 questions
High Availability Technology ---> 4 questions
LogMiner Enhancements -> 1 question
Backup & Recovery Enhancements ---> 3 questions
Data Guard ---> 3 questions
Resource Manager Enhancements ---> 2 questions
Online Operations Enhancements ---> 3 questions
Segment Management (Part I) ---> 4 questions
Segment Management (Part II) ---> 3 questions
Performance Improvements ---> 4 questions
Scalable Session Management ---> 2 questions
Real Application Clusters ---> 2 questions
File Management ---> 4 questions
Tablespace Management ---> 4 questions
Memory Management ---> 3 questions
Enterprise Manager Enhancements ---> 2 questions
by the way, I just found an enthusiast (roxylo
) posted a book about the 9i new features. It surely will help

10G NEW FEATURE-HOW TO FLUSH THE BUFFER CACHE

제품 : ORACLE SERVER
작성날짜 : 2004-05-25
10G NEW FEATURE-HOW TO FLUSH THE BUFFER CACHE
===============================================
PURPOSE
이 자료는 Oracle 10g new feature 로 manual 하게
buffer cache 를 flush 할 수 있는 기능에 대하여 알아보도록 한다.
Explanation
Oracle 10g 에서 new feature 로 소개된 내용으로 SGA 내 buffer cache 의
모든 data 를 command 수행으로 clear 할 수 있다.
이 작업을 위해서는 "alter system" privileges 가 있어야 한다.
Buffer cache flush 를 위한 command 는 다음과 같다.
주의) 이 작업은 database performance 에 영향을 줄 수 있으므로 주의하여 사용하여야 한다.
SQL > alter system flush buffer_cache;
Example
x$bh 를 query 하여 buffer cache 내 존재하는 정보를 확인한다.
x$bh view 는 buffer cache headers 정보를 확인할 수 있는 view 이다.
우선 test 로 table 을 생성하고 insert 를 수행하고
x$bh 에서 barfil column(Relative file number of block) 과 file# 를 조회한다.
1) Test table 생성
SQL> Create table Test_buffer (a number)
2 tablespace USERS;
Table created.
2) Test table 에 insert
SQL> begin
2 for i in 1..1000
3 loop
4 insert into test_buffer values (i);
5 end loop;
6 commit;
7 end;
8 /
PL/SQL procedure successfully completed.
3) Object_id 확인
SQL> select OBJECT_id from dba_objects
2 where object_name='TEST_BUFFER';
OBJECT_ID
42817
4) x$bh 에서 buffer cache 내에 올라와 있는 DBARFIL(file number of block) 를 조회한다.
SQL> select ts#,file#,dbarfil,dbablk,class,state,mode_held,obj
2 from x$bh where obj= 42817;
TS# FILE# DBARFIL DBABLK CLASS STATE MODE_HELD J
9 23 23 1297 8 1 0 7
9 23 23 1298 9 1 0 7
9 23 23 1299 4 1 0 7
9 23 23 1300 1 1 0 7
9 23 23 1301 1 1 0 7
9 23 23 1302 1 1 0 7
9 23 23 1303 1 1 0 7
9 23 23 1304 1 1 0 7
8 rows selected.
5) 다음과 같이 buffer cache 를 flush 하고 위 query 를 재수행한다.
SQL > alter system flush buffer_cache ;
SQL> select ts#,file#,dbarfil,dbablk,class,state,mode_held,obj
2 from x$bh where obj= 42817;
6) x$bh 에서 state column 이 0 인지 확인한다.
0 은 free buffer 를 의미한다. flush 이후에 state 가 0 인지 확인함으로써
flushing 이 command 를 통해 manual 하게 수행되었음을 확인할 수 있다.
Reference Documents
<NOTE. 251326.1>

I am also having the same issue. Can this be addressed or does BEA provide 'almost'
working code for the bargin price of $80k/cpu?
"Prashanth " <[email protected]> wrote:
>
Hi ALL,
I am using wl:cache tag for caching purpose. My reqmnt is such that I
have to
flush the cache based on user activity.
I have tried all the combinations, but could not achieve the desired
result.
Can somebody guide me on how can we flush the cache??
TIA, Prashanth Bhat.

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