DAQmx Logging New Features - Split files
Hi All,
With respect to this link - http://forums.ni.com/t5/Multifunction-DAQ/DAQmx-Logging-New-Features-Split-files-non-buffered-loggin...
My requirement is - Log each one minute data in single TDMS file (irrespect of the sampling rate).
For this,
I do want to understand the "Logging - Samples per File" property node value.
The value which I am passing, needs to aligned to some "X" number.
For Example,
I am requesting "120000000 Samples per File"
But the corrected value is "120171520 Samples per File"
What is the relation between both the numbers? or How I can achieve this number pragmatically?
Can you please help me on this?
Thank you,
Yogesh Redemptor
Regards,
Yogesh Redemptor
Hello Mr.Yogesh!
This error can be resolved be wiring the Logging.FileWriteSize input of the DAQmx Read property node to the required number of samples (120,000,000) .
The corrected number in this case (120171520) is related to the size of the volume sector in bytes.
Regards,
Raghu
Similar Messages
-
CS6: New feature doesn't work: Publish direct to iOS device
Just upgraded to Flash CS6 v12.0.2. It has a new feature, in File > AIR 3.2 For iOS Settings > Deployment tab > "Install Application On The Connected iOS Device."
This feature is disabled. Does anyone know how to get it enabled?
I do have iTunes installed, per http://helpx.adobe.com/flash/using/packaging-applications-air-ios.html#id_91536 .i've not seen this problem before so i suspect the issue is an os problem or usb port problem. i would be especially suspicous of an usb port issue if the problem is intermittant.
have your tried a different usb port?
once your iOS device is recognized by win explorer AND you leave it connected, does win explorer ever fail to continue recognizing your iOS device is connected? -
How to use JDK5.0 new feature code in tomcat 5.5.9, jsp files
Hi Everyone:
I am trying to use JDK5.0 new feature code -- for loop in jsp file , but got compile error , i try the same code in the java file which is working fine. i am wondering is it tomcat jsp compiler problem ?
following is my code and error msg
/* jdk 5.0 new feature, but cannot use in this jsp file, tomcat version? or setting problem ?
for (Thumbnail thumbnail : thumbnailList){
System.out.println(thumbnail.getAbsolutePath());
// following is working fine in jsp
Iterator iter = thumbnailList.iterator();
while(iter.hasNext()){
Thumbnail thumbnail = (Thumbnail) iter.next();
out.print(thumbnail.getAbsolutePath()+"<BR>");
%>
the error msg is :
HTTP Status 500 -
type Exception report
message
description The server encountered an internal error () that prevented it from fulfilling this request.
exception
org.apache.jasper.JasperException: Unable to compile class for JSP
An error occurred at line: 16 in the jsp file: /test/testImageGallery.jsp
Generated servlet error:
Syntax error on token(s), misplaced construct(s)
An error occurred at line: 16 in the jsp file: /test/testImageGallery.jsp
Generated servlet error:
Syntax error on token ")", : expected
org.apache.jasper.compiler.DefaultErrorHandler.javacError(DefaultErrorHandler.java:84)
org.apache.jasper.compiler.ErrorDispatcher.javacError(ErrorDispatcher.java:328)
org.apache.jasper.compiler.JDTCompiler.generateClass(JDTCompiler.java:397)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:288)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:267)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:255)
org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:556)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:293)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:291)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:241)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
I am using fedora core 4 x64bit , tomcat 5.5.9,
java -version
java version "1.5.0_04"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_04-b05)
Java HotSpot(TM) 64-Bit Server VM (build 1.5.0_04-b05, mixed mode)
tomcat settings
tomcat5/bin/catalina.sh run
Using CATALINA_BASE: /home/normal/tomcat5
Using CATALINA_HOME: /home/normal/tomcat5
Using CATALINA_TMPDIR: /home/normal/tomcat5/temp
Using JRE_HOME: /home/normal/jdk1.5.0_04The JDT compiler that Tomcat installs by default is only 1.4 compliant.
You can use ant instead:
remove the common/lib/jasper-compiler-jdt.jar file
place ant.jar file from the latest Ant distribution in the common/lib folder.
If you do this, you also need to use the "javac" argument to catalina.sh.
Documentation reference: http://jakarta.apache.org/tomcat/tomcat-5.5-doc/jasper-howto.html -
I am facing issue when opening flash files in Flash CC. (error:- This file was created with a later release of Flash Professional and might contain new features that would be lost when saved in the current format.)
Wow. Okay...
I'll let the real veterans in this forum tackle your issues one after the other. But, I can tell you, all will be well.
My only comment would be re: your computer specs:
BJReis wrote:
. This may be due to somewhat older equipment:
GHz Intel Core Duo MacBook Pro with a 4GB memory computer with Ddr3 running OSX 10.8.4
To be completely honest, FCPX is a RAM hog. It just is. But, RAM is relatively cheap, and the pay-off is good.
4GB is right on the edge, IMHO. 16G is ideal.
I wish you luck, hang in there, and standby for more help. -
OBE SQL Dev 1.5 New Features has broken link to file sqldevmngdb.zip
Hi there,
It appears that one of the file download links (*sqldevmngdb.zip*) in the Prerequisites for OBE Tutorial Oracle SQL Developer 1.5 New Features is broken.
[http://www.oracle.com/technology/obe/hol08/sqldev_mngdb/sqldev15nf/files/sqldevmngdb.zip]
Can you please repair this and update me when that has been done.
Have a great day.
Kind Regards,
Gary.Gary,
Thanks, I'll get that sorted, but until we do, (don't laugh), the second half of the link actually works.
Sue -
I am facing issue when opening flash files in Flash CC. (Error : - .fla was created with a later version of Adobe Flash Professional CC and might contain new features not supported in this version of Flash professional.)
fyfesa1970 wrote:
Ask a simple question and get a simple answer...see below...hilarious:
All representatives are actively assisting other customers. Your estimated wait time is 0 minute(s) and 1 second(s) or longer. Thank you for your patience.
We all can learn from this. Whenever you get stuck in a customer-service situation that goes nowhere, as soon as you become aware of the futility, get the name and employee ID of the person, then say, "I don't mean to be rude, I think we're both wasting our time. Perhaps you weren't trained for this issue, or perhaps your system isn't displaying the correct information. It doesn't matter, because I'm not getting proper customer support this way. Please ESCALATE this to your highest-level manager IMMEDIATELY. If that person isn't availabe, ESCALATE me to that person's highest-level manager. If you haven't been given the proper training, you can use this to inform your manager that you need the training. Thanks for trying to help. I appreciate it. I have copied and saved this chat session. NOW PLEASE ESCALATE THIS CASE AS I HAVE REQUESTED ABOVE. I'm waiting now... "
The point is that you're a customer, and the company needs customers, so the individual who's failing to deliver good service needs to be identified so they can be properly trained, and so that problems in the system can also be identified, but more important is that you get the service you're entitled to.
If you search the forum for similar questions, you'll see the kind of information that the volunteer users like yourself on the forum need to know about your system and files involved, so they can help you better.
Good luck.
HTH
Regards,
Peter
Peter Gold
KnowHow ProServices -
I wrote a VI that listens to an external trigger coming from a PFI line and saves a user-defined number of pretrigger+posttrigger samples into disk, and then the DAQmx restarts to wait for the next trigger. I used the DAQmx Start New File.vi to change the filename of each of the next file. However, I found that for each of the resulting TDMS files, there is an additional group that is added in addition to the real data. For example, if the groupName is set to "task_voltage", then there is an additional groupName called "task_voltage #1".
I suspect that this is because the program preallocate diskspace using the old filename for the pretriggered samples, but when the trigger happens and the samples are ready to be written into disk, an actual new file is opened and saved. The reason I think this might be the case is because, say each file would be 50kB and I already have 1 file triggered and saved, before the second trigger comes in, I can see that the file size of the first file is twice as much as it should be (100kB), but the file size will return to noraml (50kB) after the second trigger happens and a second file is created.
Does anyone know if this is really the case? Is there a way to configure the task so that this doesn't happen?
Another question I have is that the program currently set up so that the VI will wait until a trigger happens to return the values. However, this means that if a trigger doesn't happen, the VI waits indefintely, and the "stop" button in the while loop is useless. I have to use the "Abort Execustion" button on the tool bar to stop the VI. Is there a way to interrupt and stop the DAQmx task even if the trigger doesn't happen?
Thanks in advance for any help!
Attachments:
pretrigger_loop_new_file.vi 29 KBI don't believe there is a way to programmatically change/delete the group name in a TDMS file. What you can do however, is convert between TDMS and TDM using the VIs found in the Data Storage palette and then perform whatever modifications you need using the TDM utilities.
Applications/Systems/Test
National Instruments | AWR Group -
someone answer me. thanks in advance guys! =)
No files or apps are deleted when updating your phone. In any case, all your content should be safely backed up on your computer.
There are no new features, just bug-fixes and security updates. -
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 SinghYou 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. -
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. -
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 : RESUMABLE SPACE ALLOCATION
제품 : ORACLE SERVER
작성날짜 : 2002-11-01
(V9I) ORACLE 9I New Feature : Resumable Space Allocation
=====================================================
PURPOSE
Oracle9i New Feature 인 Resumable Space Allocation 에 대해
알아보도록 한다.
Explanation
Resumable Space Allocation 은 다음과 같은 새로운 Space allocation
이 발생되어야 할 시점에 에러를 바로 발생하지 않고 어느정도의 Time 을 준뒤
Admin에게 이를 알림으로써 수행중인 Transaction rollback 되지 않고 계속적으로
진행할 수 있도록 하는 기능이다.
Query 수행시 다음과 같은 원인으로 에러가 발생하면서 query 수행이 중지된다.
1) Out of space condition
2) Maximum number of extents reached condision
3) Space quota exceeded condition
그러나 9I 에서 Resumable Space Allocation Operations을 설정하게 되면
alertSID.ora file에 suspend 되는 메세지와 함께 설정한 timeout 까지 hang 상태가
발생된다. 만약 timeout 초과시엔 에러가 발생하면서 transaction은 rollback 된다.
alertSID.ora 메세지예)
Wed Mar 14 11:14:17 2001
statement in resumable session 'User SCOTT(54), Session 9, Instance 1' was
suspended due to
ORA-01631: max # extents (5) reached in table SCOTT.TEST_RESUMABLE
Example
다음은 Resumable Space Allocation Operations 을 설정하기 위해서는 RESUMABLE 을
ENABLE 시키고 또는 DBMS_RESUMABLE package를 이용한다.
1) RESUMABLE system privilege 부여
SQL> connect system/manager
Connected.
SQL> grant resumable to scott;
Grant succeeded.
2) session level에서 RESUMABLE enable 시키기
SQL> alter session enable resumable;
Session altered.
This can be set automatically through an AFTER LOGON trigger.
SQL> create or replace trigger logon_set_resumable
2 after logon
3 on scott.schema
4 begin
5 execute immediate 'alter session enable resumable timeout 1200';
6 end;
7 /
Trigger created.
3) 생성한 TEST_RESUMABLE table 에 insert 작업
-> insert 시에 hang 현상 발생(transaction rollback은 이루어지지 않는다.)
-> alert.log에 suspend message 확인
-> 만약 설정한 timeout 초과시 에러 발생되면서 transaction rollback
a. Displaying the DBA_RESUMABLE view(DBA_RESUMABLE view에서 suspend 확인)
SQL> select user_id,SESSION_ID, STATUS, START_TIME, SUSPEND_TIME,
2 SQL_TEXT, ERROR_NUMBER, ERROR_MSG
3 from dba_resumable;
USER_ID SESSION_ID STATUS START_TIME SUSPEND_TIME
SQL_TEXT
ERROR_NUMBER
ERROR_MSG
54 9 SUSPENDED 03/14/01 10:49:25 03/14/01 11:14:17
insert into test_resumable select * from test_resumable
1631
ORA-01631: max # extents (5) reached in table SCOTT.TEST_RESUMABLE
b. In alert.log file(alert.log에서 message 확인)
Wed Mar 14 11:14:17 2001
statement in resumable session 'User SCOTT(54), Session 9, Instance 1' was
suspended due to
ORA-01631: max # extents (5) reached in table SCOTT.TEST_RESUMABLE
c. The statement may issue the following error when the timeout set for the
session has expired(timeout 초과시 transaction rollback 되면서 에러 발생)
SQL> insert into test_resumable values (1);
insert into test_resumable values (1)
ERROR at line 1:
ORA-30032: the suspended (resumable) statement has timed out
ORA-01536: space quota exceeded for tablespace 'EXAMPLE'
4) The DBA now knows why the session hangs, and needs to find which action to
take to alleviate the ora-1631 error(DBA는 timeout 이 발생하기 전에 에러 발생)
SQL> connect system/manager
Connected.
SQL> alter table scott.test_resumable storage (maxextents 8);
Table altered.
SQL> select user_id,SESSION_ID, STATUS, START_TIME, RESUME_TIME,
2 SQL_TEXT, ERROR_NUMBER, ERROR_MSG
3 from dba_resumable;
USER_ID SESSION_ID STATUS START_TIME RESUME_TIME
SQL_TEXT
ERROR_NUMBER
ERROR_MSG
54 9 NORMAL 03/14/01 10:49:25 03/14/01 11:24:02
insert into test_resumable select * from test_resumable
0
5) If the session does not need to be in resumable state, the session can
disable the resumable state(더이상 resumable 기능 사용하지 않을 경우 disable 시키기)
SQL> alter session disable resumable;
Session altered.
SQL> select user_id,SESSION_ID, STATUS, START_TIME, RESUME_TIME,
2 SQL_TEXT, ERROR_NUMBER, ERROR_MSG
3 from dba_resumable;
no rows selected
Reference Document
Note. 136941.1 Using RESUMABLE Session to Avoid Transaction Abort Due to Space Errors제품 : ORACLE SERVER
작성날짜 : 2002-11-01
(V9I) ORACLE 9I New Feature : Resumable Space Allocation
=====================================================
PURPOSE
Oracle9i New Feature 인 Resumable Space Allocation 에 대해
알아보도록 한다.
Explanation
Resumable Space Allocation 은 다음과 같은 새로운 Space allocation
이 발생되어야 할 시점에 에러를 바로 발생하지 않고 어느정도의 Time 을 준뒤
Admin에게 이를 알림으로써 수행중인 Transaction rollback 되지 않고 계속적으로
진행할 수 있도록 하는 기능이다.
Query 수행시 다음과 같은 원인으로 에러가 발생하면서 query 수행이 중지된다.
1) Out of space condition
2) Maximum number of extents reached condision
3) Space quota exceeded condition
그러나 9I 에서 Resumable Space Allocation Operations을 설정하게 되면
alertSID.ora file에 suspend 되는 메세지와 함께 설정한 timeout 까지 hang 상태가
발생된다. 만약 timeout 초과시엔 에러가 발생하면서 transaction은 rollback 된다.
alertSID.ora 메세지예)
Wed Mar 14 11:14:17 2001
statement in resumable session 'User SCOTT(54), Session 9, Instance 1' was
suspended due to
ORA-01631: max # extents (5) reached in table SCOTT.TEST_RESUMABLE
Example
다음은 Resumable Space Allocation Operations 을 설정하기 위해서는 RESUMABLE 을
ENABLE 시키고 또는 DBMS_RESUMABLE package를 이용한다.
1) RESUMABLE system privilege 부여
SQL> connect system/manager
Connected.
SQL> grant resumable to scott;
Grant succeeded.
2) session level에서 RESUMABLE enable 시키기
SQL> alter session enable resumable;
Session altered.
This can be set automatically through an AFTER LOGON trigger.
SQL> create or replace trigger logon_set_resumable
2 after logon
3 on scott.schema
4 begin
5 execute immediate 'alter session enable resumable timeout 1200';
6 end;
7 /
Trigger created.
3) 생성한 TEST_RESUMABLE table 에 insert 작업
-> insert 시에 hang 현상 발생(transaction rollback은 이루어지지 않는다.)
-> alert.log에 suspend message 확인
-> 만약 설정한 timeout 초과시 에러 발생되면서 transaction rollback
a. Displaying the DBA_RESUMABLE view(DBA_RESUMABLE view에서 suspend 확인)
SQL> select user_id,SESSION_ID, STATUS, START_TIME, SUSPEND_TIME,
2 SQL_TEXT, ERROR_NUMBER, ERROR_MSG
3 from dba_resumable;
USER_ID SESSION_ID STATUS START_TIME SUSPEND_TIME
SQL_TEXT
ERROR_NUMBER
ERROR_MSG
54 9 SUSPENDED 03/14/01 10:49:25 03/14/01 11:14:17
insert into test_resumable select * from test_resumable
1631
ORA-01631: max # extents (5) reached in table SCOTT.TEST_RESUMABLE
b. In alert.log file(alert.log에서 message 확인)
Wed Mar 14 11:14:17 2001
statement in resumable session 'User SCOTT(54), Session 9, Instance 1' was
suspended due to
ORA-01631: max # extents (5) reached in table SCOTT.TEST_RESUMABLE
c. The statement may issue the following error when the timeout set for the
session has expired(timeout 초과시 transaction rollback 되면서 에러 발생)
SQL> insert into test_resumable values (1);
insert into test_resumable values (1)
ERROR at line 1:
ORA-30032: the suspended (resumable) statement has timed out
ORA-01536: space quota exceeded for tablespace 'EXAMPLE'
4) The DBA now knows why the session hangs, and needs to find which action to
take to alleviate the ora-1631 error(DBA는 timeout 이 발생하기 전에 에러 발생)
SQL> connect system/manager
Connected.
SQL> alter table scott.test_resumable storage (maxextents 8);
Table altered.
SQL> select user_id,SESSION_ID, STATUS, START_TIME, RESUME_TIME,
2 SQL_TEXT, ERROR_NUMBER, ERROR_MSG
3 from dba_resumable;
USER_ID SESSION_ID STATUS START_TIME RESUME_TIME
SQL_TEXT
ERROR_NUMBER
ERROR_MSG
54 9 NORMAL 03/14/01 10:49:25 03/14/01 11:24:02
insert into test_resumable select * from test_resumable
0
5) If the session does not need to be in resumable state, the session can
disable the resumable state(더이상 resumable 기능 사용하지 않을 경우 disable 시키기)
SQL> alter session disable resumable;
Session altered.
SQL> select user_id,SESSION_ID, STATUS, START_TIME, RESUME_TIME,
2 SQL_TEXT, ERROR_NUMBER, ERROR_MSG
3 from dba_resumable;
no rows selected
Reference Document
Note. 136941.1 Using RESUMABLE Session to Avoid Transaction Abort Due to Space Errors -
Request for new feature: Login to Flickr account
I have a request for a new feature for ATV2 in the next sw update. I am hoping Apple will read this.. Please enable ATV2 to login to our Flickr accounts. The way it is, we can't see certain contacts' pictures as their profiles are set to public.
And please find a solution to never ending "Loading XXXX's Library" screen. Loading a library on the same wifi network (both for files on Mac or Airport's USB Harddrive) takes forever.
ThanksI have an ATV2 and it was logged in fine--I had to restore a few minutes ago because it lost it's connection with iTunes Match, and now I can't log in any more. This is TERRIBLE as I HAVE to keep my photos on Flickr private, but want to have them playing on the AppleTV at home for me, friends, and parties.
Why did this go away?!?! -
With All These New Feature Packs........
With all the new feature packs that have been introduced here is a list of features that i would like to see introduced also.....
1. A password protected folder for all media files as well as document files
2. Better use of the gallery/albums....if an image is stored in the albums folder it shouldnt also appear (still) in the gallery section
3. Instead of all images being shown in the gallery irrespective of them being stored on the phone memory or memory card, users should be able to "switch" between images on phone, images on memory....only the albums folder should show images irrespective.(this feature was on previous S60 models)
4.dual sim card slots....i have two sims one for personal and one for business sometimes its a bit annoying having to take the battery out etc. to switch sims.Plus while i have my business sim in i could miss a personal call and vice verce
5.Bluetooth AD2P becoming a standard on higher end phones
6.Text to speech becoming a standard on (higher end/all) phones
7.settings in the camera should not return to default after the application is closed...if i set my camera settings for "night mode" and close the camera application when i return to "night mode" my settings should still be there rather than me having to do this all over everytime.
this is what i have come up with please add constructive ideas here.....14-Feb-2007
09:46 PM
roberth wrote:
With all the new feature packs that have been introduced here is a list of features that i would like to see introduced also.....
1. A password protected folder for all media files as well as document files
2. Better use of the gallery/albums....if an image is stored in the albums folder it shouldnt also appear (still) in the gallery section
3. Instead of all images being shown in the gallery irrespective of them being stored on the phone memory or memory card, users should be able to "switch" between images on phone, images on memory....only the albums folder should show images irrespective.(this feature was on previous S60 models)
4.dual sim card slots....i have two sims one for personal and one for business sometimes its a bit annoying having to take the battery out etc. to switch sims.Plus while i have my business sim in i could miss a personal call and vice verce
5.Bluetooth AD2P becoming a standard on higher end phones
6.Text to speech becoming a standard on (higher end/all) phones
7.settings in the camera should not return to default after the application is closed...if i set my camera settings for "night mode" and close the camera application when i return to "night mode" my settings should still be there rather than me having to do this all over everytime.
this is what i have come up with please add constructive ideas here.....
I really like the idea of the dual sim and the gallery being split to the mem c\rd and phone mem.
Is that an N95 in your pocket or are you just pleased to see me?!?
Life's too important to take seriously.
Nokias I've owned 3210, 3310, 6100, 7650, 6600, 6680, 6630, N80, N95
I'm a 26 year old boy BTW
Maybe you are looking for
-
What is the difference between SWF and F4V in the context of Streaming or progressive Download?
Hello everybody, I am absolutely a beginner in working with Captivate and furthermore my technological know how is not that good. So, I have problems to understand if the export formats SWF and F4V are both capable to be published in the Internet as
-
I keep on getting automatic updates from firefox and then I am told that I cannot run the update because my OS is too old (!). I get sent to the firefox website saying that I can find the best version for my OS version and yet once I click, I get no
-
Not recording whole programmes
Recently, (about two weeks) my you view box has been dicking about with recordings. We have a few season records set up and now and again when I go to watch an episode it has only recorded 4 mins, it's usually 4 but sometimes it's 2. It also happens
-
My internet keeps quitting on me
When I'm on safari a lot, it will unexpectidly close itself while I'm just browsing. Is there any reason why it does this?
-
Hello I am using Mavericks and I have tried to make an Automator action Export PDF to Word but I was unable since I am missing that action in PDF part of teh automator. Is it possible to ,I dont know, refresh action or something like that cause it wo