ICM Host name buffer cache parameter
Hello,
Does any body know about the ICM Host name buffer cache parameter?
I mean how long does it hold this value and cache refresh rate..
REgards,
Atul
Hello Prem,
Thanks for information.
I know that parameter and how to check.
My specific question is about hostname buffer cache rate and how long does it hold that value in buffer and refresh rate.
Regards,
Atul
Similar Messages
-
Reset Host Name buffer on WebAS Java
Hello everyone.
I'm currently planning the move of a production server to a new hardware. We need to reuse the old host name of the SAP server but it will be associated to a new IP address.
I know that in ABAP it is possible to clear / reset the host name buffer for this kind of situation.
Is it possible on a Web AS Java too? If yes, how can we achieve that?
It will be needed for an XI 7.0 / Portal 7.0 with XCM system that are connected to the system that must be moved.
Thanks in advance,
SébastienBuffers like these are automatically reset during the restart of your system. I think this will be the most safe way to do this..
Kind regards,
Mark
Edited by: M. Dijsselbloem on May 27, 2010 10:09 AM -
Host name not derived as FQDN (TH_GET_PLUGIN_INFO )
Hello,
we've got a problem in the CRM web UI, however, I assume it is more related to general BSP settings.
When testing a CRM component ICCMP_HEADER which is a BSP application in the component workbench
(tcode BSP_WD_CMPWB). The browser tells that an exception
CX_BSP_WD_HTTP_RESPONSE_ERROR is thrown in class
CL_BSP_WD_STREAM_LOADER, method LOAD_FROM_URL.
I did some debugging and found out that in this method in line 20,
function module TH_PLUGINS_ACTIVE is called. It returns that both HTTP
and HTTPS are active. Due to this, in line 31 the system calls method
CL_HTTP_CLIENT=>CREATE_BY_DESTINATION. In this method function module
TH_GET_PLUGIN_INFO is called. It returns the host name (uxsapl07)
without FQDN (.mobilkom.at). I tested the function module on our
development system (MSD) and it returns the full hostname
(vssapk08.mobilkom.at).
I've checked the host name buffer in tcode SMICM and it shows only the
hostname (no FQDN). If refreshing the buffer, it gets filled again with
only the hostname.
I've compared settings on productive system MSP with development system
MSD:
parameter: SAPLOCALHOSTFULL
MSP: uxsapl07.mobilkom.at
MSD: vssapk08.mobilkom.at
parameter: icm/host_name_full
MSP: empty
MSD: empty
However, in tcode SMICM --> paramters, both systems show the FQDN for
parameter icm/host_name_full.
I don't know why it works then on MSD and not on MSP.
Many thanks & regards
Wolfgangparameter: icm/host_name_full
MSP: empty
MSD: empty
try setting the above parameter with the FQDN (RZ10) and restart the ICM
after restart run program RSPARAM to check whether the changes had taken effect
Regards
Raja -
Suggest buffer cache size check
Hi experts,
please suggest how much give size of buffer cache. please tell me how to calculate this.
Note: on database running huge select with where clause.
>
SQL> show sga
Total System Global Area 536870912 bytes
Fixed Size 1220408 bytes
Variable Size 117440712 bytes
Database Buffers 411041792 bytes
Redo Buffers 7168000 bytes
>
>
SGA_ADVISORE
SQL> column c1 heading 'Cache Size (m)' format 999,999,999,999
SQL> column c2 heading 'Buffers' format 999,999,999
SQL> column c3 heading 'Estd Phys|Read Factor' format 999.90
SQL> column c4 heading 'Estd Phys| Reads' format 999,999,999,999
SQL>
SQL> select
2 size_for_estimate c1,
3 buffers_for_estimate c2,
estd_physical_read_factor c3,
4 5 estd_physical_reads c4
6 from
7 v$db_cache_advice
8 where
9 name = 'DEFAULT'
10 and
11 block_size = (SELECT value FROM V$PARAMETER
12 WHERE name = 'db_block_size')
and
13 14 advice_status = 'ON';
Estd Phys Estd Phys
Cache Size (m) Buffers Read Factor Reads
36 4,491 1.02 1,768,088,631
72 8,982 1.01 1,751,858,036
108 13,473 1.01 1,745,807,886
144 17,964 1.00 1,742,684,545
180 22,455 1.00 1,740,606,287
216 26,946 1.00 1,739,127,030
252 31,437 1.00 1,737,935,545
288 35,928 1.00 1,736,936,513
324 40,419 1.00 1,736,098,119
360 44,910 1.00 1,735,368,624
Estd Phys Estd Phys
Cache Size (m) Buffers Read Factor Reads
392 48,902 1.00 1,734,775,608
396 49,401 1.00 1,734,701,493
432 53,892 1.00 1,734,086,804
468 58,383 1.00 1,733,466,505
504 62,874 1.00 1,732,871,083
540 67,365 1.00 1,732,300,725
576 71,856 1.00 1,731,737,930
612 76,347 1.00 1,731,204,779
648 80,838 1.00 1,730,669,455
684 85,329 1.00 1,730,117,349
Estd Phys Estd Phys
Cache Size (m) Buffers Read Factor Reads
720 89,820 .98 1,703,583,925
21 rows selected.
Dictionary Cache Hit Ratio : 99.92% Value Acceptable.
Library Cache Hit Ratio : 98.22% Increase SHARED_POOL_SIZE parameter to bring value above 99%
DB Block Buffer Cache Hit Ratio : 60.53% Increase DB_BLOCK_BUFFERS parameter to bring value above 89%
Latch Hit Ratio : 99.72% Value acceptable.
Disk Sort Ratio : 0.00% Value Acceptable.
Rollback Segment Waits : 0.00% Value acceptable.
Dispatcher Workload : 0.00% Value acceptable.
>
Edited by: 928992 on Oct 18, 2012 2:31 PM
Edited by: 928992 on Oct 18, 2012 3:04 PMI am displaying you mine test db's buffer cache size : (11.2.0.1 on Windows box)
SQL> show parameter db_cache_size;
NAME TYPE VALUE
db_cache_size big integer 0
SQL> select name, current_size, buffers, prev_size, prev_buffers from v$buffer_pool;
NAME CURRENT_SIZE BUFFERS PREV_SIZE PREV_BUFFERS
DEFAULT 640 78800 0 0
SQL> select name,bytes from v$sgainfo where name='Buffer Cache Size';
NAME BYTES
Buffer Cache Size *671088640*
SQL> show sga;
Total System Global Area 1603411968 bytes
Fixed Size 2176168 bytes
Variable Size 922749784 bytes
*Database Buffers 671088640 bytes*
Redo Buffers 7397376 bytes
SQL> select * from v$sga;
NAME VALUE
Fixed Size 2176168
Variable Size 922749784
*Database Buffers 671088640*
Redo Buffers 7397376
SQL> show parameter sga_target;
NAME TYPE VALUE
sga_target big integer 0
SQL>Regards
Girish Sharma
Edited by: Girish Sharma on Oct 18, 2012 2:51 PM
Oracle and OS Info added. -
Hi there,
Can anyone explain these results on a 10.2.0.1 database?
SQL> select name, bytes/1024/1024 from v$sgainfo where name='Buffer Cache Size';
NAME BYTES/1024/1024
Buffer Cache Size 1728
SQL> show parameter db_cache_size
NAME TYPE VALUE
db_cache_size big integer 768M
NAME TYPE VALUE
sga_target big integer 0
As you can see AMM is disabled (sga_target=0), however v$sgainfo and dba_hist_sga record always a buffer cache size of 1728 MB and db_cache_size is set to 768 MB.
How can it be?
Many thanks.I answer myself:
db_8k_cache_size big integer 160M
db_cache_size big integer 768M
db_keep_cache_size big integer 400M
db_recycle_cache_size big integer 400M
I am like a newbee... -
Urgent: Error in Cache Parameter
Hi,
Please answer for the below issues.
Issue:
In RSRT transaction, if i goto cache monitor then it shows<b> red</b> status for flat file name in cache parameter list.
Please look at the Table for cache monitor status.
Cache Act.
Status
Green: Local Cache Size 100 MB
Global Cache Size 200 MB
Cache Persistence Mode Flat File
<b> RED:</b> Flat File Name BW_OLAP_CACHE <b><SYSID> Parameter Missing </b> Green: Comprehensive Flat File Name for AppServer
Problem 2:
When i try to execute the report from query designer or WAD, I'm facing <b>400: session timed out</b> and<b> 500: connection failed errors</b>
Please give me some doc or some suggessions
Mail ID: [email protected]
your answers will be appreciated.
Thanks,
VarunHi,
Check the notes: 899926.
Some times we get this error if the size of the result is huge .So also do the performace optimization.
With rgds,
Anil Kumar Sharma .P -
ASM Buffer Cache - which parameter is responsible for this?
Env: Oracle 10.2.0.4.0 on Windows 2003 R2 32 bit
In one of my testing databases, I saw this. Rest all databases (development and testing) do not have the component "ASM Buffer Cache".
SQL> select component, current_size, user_specified_size from v$sga_dynamic_components;
COMPONENT CURRENT_SIZE USER_SPECIFIED_SIZE
shared pool 553,648,128 209,715,200
large pool 4,194,304 0
java pool 4,194,304 0
streams pool 0 0
DEFAULT buffer cache 360,710,144 314,572,800
KEEP buffer cache 0 0
RECYCLE buffer cache 0 0
DEFAULT 2K buffer cache 0 0
DEFAULT 4K buffer cache 0 0
DEFAULT 8K buffer cache 0 0
DEFAULT 16K buffer cache 0 0
DEFAULT 32K buffer cache 0 0
ASM Buffer Cache 0 314,572,800I am not able to figure out from the component "ASM Buffer Cache" is coming in this list. Current_size is zero so its not of a concern actually but I was wondering which parameter enforces this value.
Can anybody shed some light on this?
Regards,
Message was edited by:
Satish Kandi
Forgot to mention that we are not using ASM at all.I have some databases running on 10.2.0.3.0 (testing + dev) and others on 10.2.0.4.0 (dev databases) and I can see this component in all of them.
I have no databases running at earlier versions of 10g so cannot confirm if it was there earlier too.
With your hint of 11g in mind, I searched 11g documentation too and could not find any references to this component. -
ICM active -- NO CONNECTION for all AppServers (using TREX host names / IP
Hi Experts,
Our Basis team has set up new BWA Box for a Quality. When i went to a transaction "RSDDBIAMON" I am getting below error.
Q27: ICM active --> NO CONNECTION for all AppServers (using TREX host names / IP addresses). Configure ICM/TCM connection in SAP
RFC Connection is working. I have tested it in sm59. Can anyone help to understan where will be the problem.
Regards,In TREX Admin, I was able to check ICM error and got IP address.. After this got to know host-name of the server is different from configured in ICM.
-
How to change Port Information shown in sicf in fully qualified host name?
Hi guys,
I want to use the CS Documentation Tool for SAP BW.
In DEV everything is OK, but in PROD I can´t execute.
I know what´s wrong, but I don´t know where to correct the error.
When I use transaction sicf -> execute -> GoTo -> Port Information I can only see the server name instead of the fully qualified host name.
Can anybody tell me, where to change the name?
Thanks a lot,
BarbaraThose ports are defined in the instance profile of the system and can be defined/changed from RZ10. The parameter is icm/server_port_xx. If the parameter is not defined then it uses the default values.
The profile values looks something like this:
icm/server_port_0 PROT=HTTP,PORT=80$$,TIMEOUT=90,PROCTIMEOUT=3600
icm/server_port_1 PROT=SMTP,PORT=25$$,TIMEOUT=90,PROCTIMEOUT=3600
Hope this helps.
Thanks,
Naveed -
Find available space in buffer cache
Hi.
I want to find available space from buffer cache. First thought was to make it 8i-9i comp, by not using v$bh to calculate sum of memory and available space.
I have the following pl/sql block to calculate the values:
declare
num_free_blck integer;
num_all_blck integer;
num_used_blck integer;
overal_cache number := 0;
used_cache number := 0;
free_cache number := 0;
blck_size integer;
pct_free number := 0;
begin
select count(1) into num_free_blck from v$bh where status='free';
select count(1) into num_all_blck from v$bh;
select count(1) into num_used_blck from v$bh where status <> 'free';
select value into blck_size from v$parameter where name ='db_block_size';
used_cache := (blck_size * num_used_blck)/(1024*1024);
free_cache := (blck_size * num_free_blck)/(1024*1024);
overal_cache := (blck_size * num_all_blck)/(1024*1024);
pct_free := ((free_cache/overal_cache)*100);
dbms_output.put_line('There are '||num_free_blck||' free blocks in buffer cache');
dbms_output.put_line('There are '||num_used_blck||' used block in buffer cache');
dbms_output.put_line('There are totally '||num_all_blck||' blocks in buffer cache');
dbms_output.put_line('Overall cache size is '||to_char(overal_cache,'999.9')|| 'mb');
dbms_output.put_line('Used cache is '||to_char(used_cache,'999.9')||' mb');
dbms_output.put_line('Free cache is '||to_char(free_cache,'999.9')||' mb');
dbms_output.put_line('Percent free db_cache is '||to_char(pct_free,'99.9')||' %');
end;
The result of the execution is:
SQL> @c:\temp\bh
There are 3819 free blocks in buffer cache
There are 4189 used block in buffer cache
There are totally 8008 blocks in buffer cache
Overall cache size is 62.6mb
Used cache is 32.7 mb
Free cache is 29.8 mb
Percent free db_cache is 47.7 %
PL/SQL-prosedyren ble fullført.
SQL>
This is not correct according to the actuall size of the buffer cache:
SQL> select name,value from v$parameter where name='db_cache_size';
NAME
VALUE
db_cache_size
67108864
SQL>
Anyone that have an idea bout this?
Thanks
Kjell OveMark D Powell wrote:
select decode(state,0,'Free',
1,'Read and Modified',
2,'Read and Not Modified',
3,'Currently being Modified',
'Other'
) buffer_state,
count(*) buffer_count
from sys.xx_bh
group by decode(state,0,'Free',
1,'Read and Modified',
2,'Read and Not Modified',
3,'Currently being Modified',
'Other'
Provided the OP figures out that xx_bh is probably a view defined by sys on top of x$bh this will get him the number of free buffers - which may be what he wants - but apart from that your query is at least 10 years short of complete, and the decode() of state 3 is definitley wrong.
The decode of x$bh.state for 10g is:
decode(state,
0,'free',
1,'xcur',
2,'scur',
3,'cr',
4,'read',
5,'mrec',
6,'irec',
7,'write',
8,'pi',
9,'memory',
10,'mwrite',
11,'donated'
), and for 11g it is:
decode(state,
0, 'free',
1, 'xcur',
2, 'scur',
3, 'cr',
4, 'read',
5, 'mrec',
6, 'irec',
7, 'write',
8, 'pi',
9, 'memory',
10, 'mwrite',
11, 'donated',
12, 'protected',
13, 'securefile',
14, 'siop',
15, 'recckpt',
16, 'flashfree',
17, 'flashcur',
18, 'flashna'
), (At least, that was the last time I looked - they may have changed again in 10.2.0.5 and 11.2.0.2)
Regards
Jonathan Lewis -
Fully Qualified Host Name does not work
Hello,
I've EP 7 with Usage Types AS Java, EPC, EP, BI Java, BP-ERP & XSS.
I am using fully qualified hostname by means of making entries in hosts file at OS level. I've also set icm/host_name_full parameter correctly.
Now when I enter URL as http://<fully qualified hostname>:<port>/irj/portal I am able to login to the system but after which if I try to navigate through any links under Employee Self-Service and Manager Self-Service for e.g. Employee Self-Service --> Benifits and Payment --> Request Claims, nothing happens. neither it throws any error nor does any page is displayed.
Same thing when I try without using fully qualified hostname like http://<hostname>:<port>/irj/portal it works absolutely fine.
I have done same settings as described above on my development as well as production system where it works absolutely fine with fully qualified hostname.
Regards,
KashyapHi
if you are using proxy try adding your domain name in your proxy exceptions list
Internet Options ->Connections ->Lan Settings->Proxy Server ->Advanced->Exceptions . try adding your host name to that list
hope it will work.
Jo -
FQHN (Fully qualified host name)
Hi all,
I'm trying to use FQHN in my PI 7.0 installation. I'm not a basis guy but I have installed a successfull instance without using FQHN before, now I want to do this again using FQHN.
I need information on this topic; such as where to set the host name to a FQHN. Is there a guide on this? Any related links and help will be very much appreciated.
Regards,
GökhanHi again,
I have observed that my host name is used in these places:
etc/hosts file
Exchange Profile hostname parameters
SLDAPICUST transaction
RFC destinations like SAPSLDAPI, LCRSAPRFC etc
Visual Admin: SLD Data Supplier, Destinations -> PMISTORE, JCO RFC Provider
Also, there's an icm/host_name_full parameter in RZ10, which I have changed accordingly.
I have made up a FQHN for my server, which I configured from the computer name in the Windows settings. It has a form like myhost.mydomain.com and it is not on a domain. I have a basic local installation.
In SAPInst, I entered my host name as only , as it would not let me use the form myhost.mydomain.com. Afterwards, I have changed the name in the places I have listed above.
Is this enough for SAP standards for FQHN or have I missed any steps? I really need a guide on this.
Thanks,
Gökhan -
hi friends
In sld technical system enter information
web as name (sid) -
instalation number -
database host name -
host name -
message port -
above mention are to give by our own naming convention or given by system convention i mean web as name (sid)/ instalation number
database host name / host name/ message port if it has to be give by system name conventions where can i fine out host name in system what is transcation code for host name ?
help me
rajHello Raja ,
Go to transaction SMICM --> Go to (Menu) --> parameters --> Display.
Move acorss the list of parametes displayed and you will find the Fully Qualified hostname -
icm/host_name_full
Hope tihs is useful for you.
With Regards,
Raju.
**********Please reward points if found useful. -
Sql query executes faster 2. time despite clearing buffer cache/shared pool
Hi All,
I want to test query performance, so i clear cache in following way before each execution:
alter system flush buffer_cache;
alter system flush shared_pool;
But, first execution takes more time than second and consequent executions. For example first execution takes 30 seconds, consequent executions take 3 seconds.
Before each execution I clear the cache.
What can be the reason? I use TOAD for query execution. Does TOAD caches something after first execution?
And last question. Is there a dynamic query that query execution duration is stored?
Any help will be appreciated.
Thanks.>
So there shouldn't be problem from the parameter, can you post result from V$SGA_DYNAMIC_COMPONENTS and v$SGAINFO ?
V$SGA_DYNAMIC_COMPONENTS
COMPONENT CURRENT_SIZE MIN_SIZE MAX_SIZE USER_SPECIFIED_SIZE OPER_COUNT LAST_OPER_TYP LAST_OPER LAST_OPER GRANULE_SIZE
shared pool 436207616 402653184 0 0 125 GROW IMMEDIATE 02-JUL-09 16777216
large pool 201326592 117440512 0 83886080 12 SHRINK DEFERRED 02-JUL-09 16777216
java pool 16777216 16777216 0 0 0 STATIC 16777216
streams pool 16777216 16777216 0 0 0 STATIC 16777216
DEFAULT buffer cache 1895825408 1711276032 0 16777216 137 GROW DEFERRED 02-JUL-09 16777216
KEEP buffer cache 0 0 0 0 0 STATIC 16777216
RECYCLE buffer cache 0 0 0 0 0 STATIC 16777216
DEFAULT 2K buffer cache 0 0 0 0 0 STATIC 16777216
DEFAULT 4K buffer cache 0 0 0 0 0 STATIC 16777216
DEFAULT 8K buffer cache 0 0 0 0 0 STATIC 16777216
DEFAULT 16K buffer cache 0 0 0 0 0 STATIC 16777216
DEFAULT 32K buffer cache 0 0 0 0 0 STATIC 16777216
ASM Buffer Cache 0 0 0 16777216 0 STATIC 16777216
V$SGA_INFO
NAME BYTES RESIZEABL
Fixed SGA Size 2086392 No
Redo Buffers 14688256 No
Buffer Cache Size 1895825408 Yes
Shared Pool Size 436207616 Yes
Large Pool Size 201326592 Yes
Java Pool Size 16777216 Yes
Streams Pool Size 16777216 Yes
Granule Size 16777216 No
Maximum SGA Size 2634022912 No
Startup overhead in Shared Pool 218103808 No
Free SGA Memory Available 50331648 -
LRU and CKPTQ in database buffer cache
Hi experts out here,
This functionality will work out in Database buffer cache of Oracle 10.2 or greater.
Sources:OTN forums and Concepts 11.2 guide
As per my readings.To improve the funtionality and make it more good Database Bufer cache is divided into several areas which are called workareasNow further
zooming this each workarea will store multiple lists to store the buffers inside the database buffer cache.
Each wrokarea can have one or more then one lists to maintain the wrokordering in there.So the list each workarea will have is LRU list and CKPTQ list.LRU list
is a list of pinned,free and dirty buffers and CKPTQ is a list of Dirty buffers.We can say CKPTQ is a bundled of dirty buffers in low RBA ordering and ready to be flushed from cache to disk.
CKPTQ list is maintained in low RBA ordering.
As being novice let me clear about low RBA and High RBA first
RBA is stored in the block header and will give us the information about when this block is changed and how many times it is changed.
Low RBA : the low RBA is the address of the redo for the first change that was applied to the block since it was last clean,
high RBA : the high RBA is the address of the redo for the most recent change to have been applied to the block.
Now Back to CKPTQ
It can be like this (Pathetic diagram of CKPTQ)
lowRBA==================================High RBA
(Head Of CKPTQ) (Tail Of CKPTQ)
CKPTQ is a list of Dirty buffers.As per RBA concept.The most recent buffer modified is at the tail of CKPTQ.
Now oracle process starts and Try to Get buffer from DB cache if it gets a Buffer it will put a buffer MRU end of the LRU list.and buffer will become the most
recently used.
Now if process cant find a required buffer.then first it will try to find out Free buffer in LRU.And if it finds it its over it will place a datablock from datafile to the
place where free buffer was sitting.(Good enough).
Now if process cant fnd a Free buffer in LRU then First step would be it will find some Dirty buffers from the LRU end of the LRU list and place them on a
CKPTQ(Remeber in low order of RBA it will arrange it in CKPT queue). and now oracle process will take required buffer and place it on the MRU end of LRU list.(Because space has been acclaimed by moving Dirty buffers to CKPTQ).
I am sure that from CKPTQ the buffers(to be more accurate Dirty buffers) will move to datafiles.all the buffers are line up n CKPTQ in lower RBA first manner.But
will be flushed to datafile how and in which manner and what event?
This is what i understand after last three days flicking through blogs,forums and concepts guide.Now what i am missing please clear me out and apart from that
i cant link the following functionalities with this flow..that is
1)How the incremental checkpoint work with this CKPTQ?
2)Now what is that 3 seconds timeout?
(Every 3 seconds DBWR process will wake and find if anything there to write on datafiles for this DBWR will only check CKPTQ).
3)apart form 3 second funda , when CKPTQ the buffers will be moved??(IS it when Process cant find any space in CKPTQ to keep buffers from LRU.ITs a
moment when buffer from CKPTQ will be moved to disk)
4)Can you please relate when control file will be updated with checkpoint so it can reduce recovery time?
To many ques but i am trying to build up the whole process in mind that how it works may be i can be wrong in any phase in any step please correct me up and
take me @ the end of flow..
THANKS
KameshHi Amansir,
So i m back with my bunch of questions.I cant again ask a single because you know its a flow so i cant end up with single doubt.Thanks for your last reply.
Yes amansir first doubt clear that was buffer will be inserted at MID point for this i got one nice document (PDF)names "All about oracle touch count algorithm by CRAIG A SHALLAHAMER".That was quite nice PDF allabout hot and cold buffer and buffer movments inside the LRU list.I am prettly much clear with that point.Thank you. and Incremental checkpoint i read from Harald.van.Breederode ppt a person from oracle.You have shared it on one of your thread.that was nice reference
flicking through threads i came across term REPL and its variations REPL-AUX (thread was for Oracle 9i).Is this variation REPL-AUX deprecated in 10g So i i am not wrong For each work area two main lists that are LRU and CKPTQ exists??not more than that any other types?
For non-RAC database Thread checkpoint is a Full checkpoint?
I read about the incremental checkpointing Here incremental checkpointing in my words n brief.Incremental Checkpoints means write only some selected buffer from CKPTQ to Datafiles.FROM CKPTQ few Low orders RBA buffers are selected and chekcpointed *(Buffer will be checkpointed on many conditions)* and When the Next checkpoint occurs that buffers are flushed to disk.Now this thing *(Checkpointing few buffers and flushing them to disk)* can be multiple times within three seconds so after 3 seconds *(This is the 3 second concept i was asking in the starting of the thread,Can this time be changed if yes with which parameter)* the checkpoint RBA and Checkpoint*(the point upto which database buffer has flushed to disk)* will be updated in Control file header *(Datafile also)* by CKPT process.So that Checkpoint will be used for Instance recovery purpose.Which can dramatically down the instance recovery time.
every 3 seconds control file is updated with checkpoint and that checkpoint is the point from where we have to start the recovery process in oracle from redo log.I m aware that incremental checkpointing is controlled by Fast_start_mttr_target prarameter and now it is autotuned for >10.2 but the smaller value i will keep the less time my instance will take.
Is above two para right what i understood if wrong correct me??
What i understand is after three seconds it will take some buffers from the CKPTQ ( from low RBA end ) and flush them to disk.apart from this many other conditions are there when Data will be flushed to disk.
1) like CKPTQ is full.
2)Process cant find a free buffer in LRU
3)to advance checkpoint DBWR writes..
Correct me if i m wrong?
THANKS
Kamesh
Edited by: Kamy on May 2, 2011 10:55 PM
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MobileMe Galleries not posting edits
I am posting edited images into a MobileMe Gallery from Aperture 3. When I have created a gallery from scratch or am drag-and-dropping additional images, they edited images are not posting, but the unedited masters. They edited images are in .TIFF fo