Buffer Cache to Datafile
While taking User managed hotbackup
how the data will be writen to the datafile from buffer cache
Thanks
All the changes to the database are recorded in the archive logs. Do you have all the archivelogs while the database was in hotbackup mode and the ones that were created after? You can only restore up to your last archive, assuming that there are no archivelog gaps.
Similar Messages
-
What else are stored in the database buffer cache?
What else are stored in the database buffer cache except the data blocks read from datafiles?
That is a good idea.
SQL> desc v$BH;
Name Null? Type
FILE# NUMBER
BLOCK# NUMBER
CLASS# NUMBER
STATUS VARCHAR2(10)
XNC NUMBER
FORCED_READS NUMBER
FORCED_WRITES NUMBER
LOCK_ELEMENT_ADDR RAW(4)
LOCK_ELEMENT_NAME NUMBER
LOCK_ELEMENT_CLASS NUMBER
DIRTY VARCHAR2(1)
TEMP VARCHAR2(1)
PING VARCHAR2(1)
STALE VARCHAR2(1)
DIRECT VARCHAR2(1)
NEW CHAR(1)
OBJD NUMBER
TS# NUMBERTEMP VARCHAR2(1) Y - temporary block
PING VARCHAR2(1) Y - block pinged
STALE VARCHAR2(1) Y - block is stale
DIRECT VARCHAR2(1) Y - direct block
My question is what are temporary block and direct block?
Is it true that some blocks in temp tablespace are stored in the data buffer? -
What are all information brought into database buffer cache ?
Hi,
What are all information brought into database buffer cache , when user does any one of operations such as "insert","update", "delete" , "select" ?
Whether the datablock to be modified only brought into cache or entire datablocks of a table brought into cache while doing operations i mentioned above ?
What is the purpose of SQL Area? What are all information brought into SQLArea?
Please explain me the logic behind the questions i asked above.
thanks in advance,
nvseenuDocumentation is your friend. Why not start by
reading the
[url=http://download.oracle.com/docs/cd/B19306_01/serv
er.102/b14220/memory.htm]Memory Architecturechapter.
Message was edited by:
orafad
Hi orafad,
I have learnt MemoryArchitecture .
In that documentation , folowing explanation are given,
The database buffer cache is the portion of the SGA that holds copies of data blocks read from datafiles.
But i would like to know whether all or few datablocks brought into cache.
thanks in advance,
nvseenu -
Available blocks in buffer cache
Hi.
I need to find available blocks in buffer cache. I can not query x$bh as not sysdba user. Anyone that has an idea how to get this information. I tried query the v$bh view but I can not get it right.
Anyone with a good idea?
Rgds
Kjell OVeNo,
When you have a 100m buffer cache, it means you can buffer 100m/8k blocks of your database in cache, and you don't need to read them from disk.
When the cache gets full Oracle will use a modified Least Recently Used algorithm to determine which blocks can be flushed.
If the block is unmodified (not dirty) it will simply be removed, if it is modified it will be written to disk.
When you insert a record (you seem to be really obsessed by this)
- Oracle will look for free space in the current segment.
When it finds a block and it is not in cache, it will retrieve this in cache.
- if there is no space, Oracle will allocate a new extent.
It will retrieve blocks from the new extent in cache. Simply: each block in the cache has a RBA (relative block address). The RBA points to a block on disk.
- When it can't allocate an extent, Oracle will try to extend the tablespace (actually the datafile)
If this doesn't succeed Oracle will raise an error, and send the error number and error text to the client program.
The failing statement will be rolled back automatically.
Hth
Sybrand Bakker
Senior Oracle DBA -
Swapping and Database Buffer Cache size
I've read that setting the database buffer cache size too large can cause swapping and paging. Why is this the case? More memory for sql data would seem to not be a problem. Unless it is the proportion of the database buffer to the rest of the SGA that matters.
Well I am always a defender of the large DB buffer cache. Setting the bigger db buffer cache alone will not in any way hurt Oracle performance.
However ... as the buffer cache grows, the time to determine 'which blocks
need to be cleaned' increases. Therefore, at a certain point the benefit of a
larger cache is offset by the time to keep it sync'd to the disk. After that point,
increasing buffer cache size can actually hurt performance. That's the reason why Oracle has checkpoint.
A checkpoint performs the following three operations:
1. Every dirty block in the buffer cache is written to the data files. That is, it synchronizes the datablocks in the buffer cache with the datafiles on disk.
It's the DBWR that writes all modified databaseblocks back to the datafiles.
2. The latest SCN is written (updated) into the datafile header.
3. The latest SCN is also written to the controlfiles.
The following events trigger a checkpoint.
1. Redo log switch
2. LOG_CHECKPOINT_TIMEOUT has expired
3. LOG_CHECKPOINT_INTERVAL has been reached
4. DBA requires so (alter system checkpoint) -
Data buffer cache has undo information...??
do data buffer in sga has any undo information....??
920273 wrote:
in sga we have data buffer ..... in data buffer cache if i m updating a block, do any undo information is maintained in buffer cache regarding the change, i hav made in block.....am
lets take an example if i m updating a block having value '2' to '4'...and dbwriter not writes to datafiles ...in this case do any undo information is maintained in buffer cache...???Hmmm.. When you updated value 2 to 4, so still its uncommitted then the transaction is active and it will be in buffer cache itself. Of course if the cache is full or performed any checkpoint, then this modified data also writtened into data files. So you should not mention dbwriter not writes to datafiles you cant predict when cache going to full or checkpoint occurred. -
Database buffer cache and library cache (order)
hi
after I issue:
select * from employees where employee_id=98
which one is performed by oracle first?
Oracle looks database buffer cache for any block it needs.
If block not found in database buffer cache ;server reads block from datafile and places copy in database buffer cache
OR
parse the sql and look in library cache for same execution plan ,.....Hi Ricardinho
How does Oracle know which blocks it might need ? Does it need blocks from any indexes or does it only need blocks from a table ?
Do you think it even remotely likely that Oracle will somehow get all the blocks it needs first and then worry about determining an execution plan at some later point in time ?
Cheers
Richard Foote
http://richardfoote.wordpress.com/ -
hi
when i log on to database and i issue an update statement , the blocks are loaded into buffer cache and buffers marked as dirty
after that i issue commit statment, what is the state of buffers?
are buffers still dirty?
what is the diffrence between state of buffers before and after commit statment?
thanks in advance
Edited by: user3683976 on Dec 6, 2008 3:42 PM
Edited by: user3683976 on Dec 6, 2008 4:43 PMuser3683976 wrote:
hi
when i log on to database and i issue an update statement , the blocks are loaded into buffer cache and buffers marked as dirty
after that i issue commit statment, what is the state of buffers?
are buffers still dirty?You need to read the Concepts guide IMHO. When you issue a commit,the state of the buffers depends upon where they are?There may be very well chance that the buffers ,before getting a commit are checkpointed to the datafile.If that would be the case than even after the commit,in the datafile,they will remain as dirty only. I guess that's logical because Oracle never got a chance to clear their transaction header to clean out the status of the transction. This cleaning willl be done next time when the query will pull them out from the datafile and will bring in the cache. The behavior is called delayed block cleanout.
If the buffers are in the cache only,they will be cleaned immediately ,hence will be marked as clean buffers.
what is the diffrence between state of buffers before and after commit statment?BEefore commit, they are dirty or inconsistent. After commit,they are clean or consistent.
HTH
Aman.... -
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 -
Hi, I'm a newbie to the forums, so please bear with me.
I am trying to determine if the usual buffer cache hit ratio figures are irrelevant when used on a RAC environment, because of Cache Fusion and the blocks being moves between the SGA's of the instance?Buffer cache hit ratios are always relevant (but not necessarily an indicator of performance).
Wether it is coming in by cache fusion or a direct read from a datafile, you are still moving a datablock into the cache or reading from the cache. -
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. -
Hello -
We have 3 x EX2010 SP3 RU5 nodes in a cross-site DAG.
Multi-role servers with 18 GB RAM [increased from 16 GB in an attempt to clear this warning without success].
We run nightly backups on both nodes at the Primary Site.
Node 1 backup covers all mailbox databases [active & passive].
Node 2 backup covers the Public Folders database.
The backups for each database are timed so they do not overlap.
During each backup we get several of these event log warnings:
Log Name: Application
Source: ESE
Date: 23/04/2014 00:47:22
Event ID: 906
Task Category: Performance
Level: Warning
Keywords: Classic
User: N/A
Computer: EX1.xxx.com
Description:
Information Store (5012) A significant portion of the database buffer cache has been written out to the system paging file. This may result in severe performance degradation.
See help link for complete details of possible causes.
Resident cache has fallen by 42523 buffers (or 27%) in the last 903 seconds.
Current Total Percent Resident: 26% (110122 of 421303 buffers)
We've rescheduled the backups and the warning message occurences just move with the backup schedules.
We're not aware of perceived end-user performance degradation, overnight backups in this time zone coincide with the business day for mailbox users in SEA.
I raised a call with the Microsoft Enterprise Support folks, they had a look at BPA output and from their diagnostics tool. We have enough RAM and no major issues detected.
They suggested McAfee AV could be the root of our problems, but we have v8.8 with EX2010 exceptions configured.
Backup software is Asigra V12.2 with latest hotfixes.
We're trying to clear up these warnings as they're throwing SCOM alerts and making a mess of availability reporting.
Any suggestions please?
Thanks in advanceHaving said all that, a colleague has suggested we just limit the amount of RAM available for the EX2010 DB cache
Then it won't have to start releasing RAM when the backup runs, and won't throw SCOM alerts
This attribute should do it...
msExchESEParamCacheSizeMax
http://technet.microsoft.com/en-us/library/ee832793.aspx
Give me a shout if this is a bad idea
Thanks -
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 -
Many "Flushing buffer cache" in 11.1.0.7
Hello,
I am getting "ALTER SYSTEM: Flushing buffer cache" in out alert log continuously . I have not done any buffer pool flushing but still it coming . does anyone know is there any oracle scheduled job will do this ? or this will happen only by issuing a manual command ?
Any thoughts will be highly appreciated.
Thu Jul 11 03:46:27 2013
Archived Log entry 151129 added for thread 1 sequence 92387 ID 0xc7afa6e dest 1:
Thu Jul 11 03:48:07 2013
ALTER SYSTEM: Flushing buffer cache
Thu Jul 11 03:50:28 2013
ALTER SYSTEM: Flushing buffer cache
Thu Jul 11 03:51:29 2013
ALTER SYSTEM: Flushing buffer cache
Thu Jul 11 03:52:25 2013
ALTER SYSTEM: Flushing buffer cache
Thu Jul 11 03:53:00 2013
ALTER SYSTEM: Flushing buffer cache
Thu Jul 11 03:53:29 2013
ALTER SYSTEM: Flushing buffer cache
Thu Jul 11 03:57:27 2013
Thanks
AjuThis is not normal. Can be issued manually or by sheduled jobs, or by 3rd party software. Are you running PeopleSoft?
As adviced already check AUDIT_TRAIL, check that auditing is enabled first, and issue one flush manually to be sure that this action is logged.
Bug 12530225 : ALTER SYSTEM: FLUSHING BUFFER CACHE MESSAGES IN ALERT.LOG
Regards
Ed -
" unable to allocate space from the buffer cache" Message
Hi
I am trying to delete a large volume or records from a BTREE database. I have used the DB_SET_RANGE with a cursor to locate the desired records. After that the Dbc::get() with DB_NEXT is called. After deleting a considerable amount of records I am receiving a message in the error callback function as "unable to allocate space from the buffer cache".
What might be the reason for such a message.
Regards
NisamNisam,
This means that the cache is full and there are no pages that BDB can evict to make space. Are you running with the default cache size? You can increase the cache size by calling: dbenv->set_cachesize or db->set_cachesize.
Related docs:
Selecting a cache size: http://www.oracle.com/technology/documentation/berkeley-db/db/ref/am_conf/cachesize.html
Bogdan Coman
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