Oracle RAW / Long / LOBs - Buffer cache?
Hello guys,
i think i have read sometime ago something about that LOBs are not cached in the buffer cache? Is this right?
I also think that i can remember that raw or long are stored in the sga buffer cache?
I can not find any official documentation about that topic... maybe you can help me...
Thanks and Regards
Stefan
Hi,
Depends on whether you are on about temporary lobs or lobs that are persisted as a column. If it's as a column then you have the cache/cache read/nocache option which is part of the lob storage clause. If it's nocache it's not put into the buffer cache and if it's cache it is (and I'm sure you can figure out from this what "cache read" means)
If it's a temporary lob then it exists in the temporary tablespace which if a true temp tablespace (which it should be) will be accessed using direct IO (so not buffered).
An the official documentation is easily found, Oracle wrote a whole manual dedicated to LOBS...
http://download.oracle.com/docs/cd/B19306_01/appdev.102/b14249/toc.htm
HTH
Chris
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Unix buffer cache vs oracle database buffer cache
1. What difference between operating system buffer cache and oracle buffer cache?
2. In what case, oracle is using oracle buffer cache? in what case, oracle doesn't use buffer cache instead of using OS buffer cache.
I am confused about this concept.
Appreciate any help.
S.ski123 wrote:
1. What difference between operating system buffer cache and oracle buffer cache?
2. In what case, oracle is using oracle buffer cache? in what case, oracle doesn't use buffer cache instead of using OS buffer cache.
I am confused about this concept.
Appreciate any help.
S.I am not sure that where is the confusion. Oracle's buffer cache would be an inevitable since whatever would be accessed in the oracle database , would have to go through the buffer cache. Though this can be bypassed as well but that's only for a specific purpose. If you won't be using the buffer cache, how else the data would be given to the end user? It has to go through the buffer cache since the data is retrieved not just for one time access but for the future access as well. And the buffer cache stores that data for the future requests also.
The o/s cache is , well, for the o/s. So once the buffer leaves from the oracle ecosystem, it would be there. What exactly you want to compare between two and why here?
Aman.... -
How can I calculate current buffer cache usage?
Hi;
What is Db version?
Pelase see:
http://blog.lishman.com/2008/05/oracle-quick-tip-querying-buffer-cache.html
Also see below googling which is mention your question's answer
http://www.google.com.tr/#hl=tr&source=hp&q=buffer+cache+usage%3F+&oq=buffer+cache+usage%3F+&aq=f&aqi=&aql=&gs_sm=e&gs_upl=0l0l0l250l0l0l0l0l0l0l0l0ll0&fp=503f556dbe78c402&biw=1280&bih=797
Regard
Helios -
Will Oracle look into the database buffer cache in this scenario?
hi guys,
say I have a table with a million rows, there are no indexes on it, and I did a
select * from t where t.id=522,000.
About 5 minutes later (while that particular (call it blockA) block is still in the database buffer cache) I do a
select * from t where t.id >400,000 and t.id < 600,000
Would Oracle still pick blockA up from the database buffer cache? if so, how? How would it know that that block is part of our query?
thanksWithout an Index, Oracle would have done a FullTableScan on the first query. The blocks would be very quickly aged out of the buffer cache as they have been retrieved for an FTS on a large table. It is unlikely that block 'A' would be in the buffer_cache after 5minutes.
However, assuming that block 'A' is still in the buffer_cache, how does Oracle know that records for the second query are in block 'A' ? It doesn't. Oracle will attempt another FullTableScan for the second query -- even if, as in the first query -- the resultset returned is only 1 row.
Now, if the table were indexed and rows were being retrieved via the Index, Oracle would use the ROWID to get the "DBA" (DataBlockAddress) and get the hash value of that DBA to identify the 'cache buffers chain' where the block is likely to be found. Oracle will make a read request if the block is not present in the expected location.
Hemant K Chitale
http://hemantoracledba.blogspot.com -
I need to calculate buffer cache size calculation for get operation.
SELECT o.object_name, h.status, count(*) number_of_blockes
FROM V$BH h, DBA_OBJECTS o WHERE h.objd=o.data_object_id
AND o.owner NOT IN('SYS','SYSTEM','SYSMAN')
AND h.status NOT IN('free')
GROUP BY o.object_name,h.status
ORDER BY count(*) DESC;
Used the above query, so i got the number of blocks used to cache data.
I performed a get operation in one db and number of blocks noticed.
But the problem is same operation in another db shows different number of blocks.
Both db are same configuration.
Anyone notices this issue??Why do you expect them to be the same?
Oracle version of each database?
Number of objects in each database?
Size of buffer cache in each database?
The amount of query activity that would actually load blocks into the buffer cache in each database is not likely to be "the same".
Identical data can take up a different number of blocks in different databases, depending on how it was loaded, transactions on that data, etc, so the number of blocks used in the buffer cache is likely to be different in different databases, even for the same data set. -
Will I increase my Buffer Cache ?
Oracle 9i
Shared Pool 2112 Mb
Buffer Cache 1728 Mb
Large Pool 32Mb
Java Pool 32 Mb
Total 3907.358 Mb
SGA Max Size 17011.494 Mb
PGA
Aggregate PGA Target 2450 Mb
Current PGA Allocated 3286059 KB
Maximum PGA Allocated (since Startup) 3462747 KB
Cache Hit Percentage 98.71%
The Buffer Cache Size advise is telling me that if I increase the Buffer Cache to 1930Mb i will get a 8.83 decrease in phyiscal reads (And its get better the more I increase it)
The question is .. can I safely increase it (In light of my current memory allocations) ? Is it worth it .. ?Two things stand out:
Your sga max size is 17Gb, but you are only using about 4Gb of it - so you seem to have 13Gb that you are not making best use of.
Your pga aggregate target is 2.4Gb, but you've already hit a peak of 3.4Gb - which means your target may be too small - so it's lucky you had all that spare memory which hadn't gone into the SGA. Despite the availability of memory, some of your queries may have been rationed at run-time to try to minimise the excess demand.
Is this OLTP or DSS - where do you really need the memory ? (Have a look in v$process to see the pga usage on a process by process level).
How many processes are allowed to connect to the database ? (You ought to allow about 2Mb - 4Mb per process to the pga_aggregate_target for OLTP) and at least 1Mb per process for the buffer cache.
Where do you see time lost ? time on disk I/O, or time on CPU ? What type of disk I/O, what's the nature of the CPU usage. These figures alone do not tell us what you should do with the spare memory you seem to have.
A simple response to your original question would be that you probably need to increase the pga_aggregate_target, and you might as well increase the buffer size since you seem to have the memory for both.
On the downside, changing the pga_aggregate_target could cause some execution plans to change; and changing the buffer size does change the limit size on a 'short' table, which can cause an increase in I/O as an unlucky side effect if you're a little heavy on "long" tablescans.
Regards
Jonathan Lewis
http://jonathanlewis.wordpress.com
http://www.jlcomp.demon.co.uk -
Does buffer cache size matters during imp process ?
Hi,
sorry for maybe naive question but I cant imagine why do Oracle need buffer cache (larger = better ) during inserts only (imp process with no index creation) .
As far as I know insert is done via pga area (direct insert) .
Please clarify for me .
DB is 10.2.0.3 if that matters :).
Regards.
GregSurprising result: I tried closing the db handles with DB_NOSYNC and performance
got worse. Using a 32 Meg cache, it took about twice as long to run my test:
15800 seconds using DB->close(DB_NOSYNC) vs 8200 seconds using DB->close(0).
Here is some data from db_stat -m when using DB_NOSYNC:
40MB 1KB 900B Total cache size
1 Number of caches
1 Maximum number of caches
40MB 8KB Pool individual cache size
0 Maximum memory-mapped file size
0 Maximum open file descriptors
0 Maximum sequential buffer writes
0 Sleep after writing maximum sequential buffers
0 Requested pages mapped into the process' address space
26M Requested pages found in the cache (70%)
10M Requested pages not found in the cache (10811882)
44864 Pages created in the cache
10M Pages read into the cache (10798480)
7380761 Pages written from the cache to the backing file
3452500 Clean pages forced from the cache
7380761 Dirty pages forced from the cache
0 Dirty pages written by trickle-sync thread
10012 Current total page count
5001 Current clean page count
5011 Current dirty page count
4099 Number of hash buckets used for page location
47M Total number of times hash chains searched for a page (47428268)
13 The longest hash chain searched for a page
118M Total number of hash chain entries checked for page (118169805)
It looks like not flushing the cache regularly is forcing a lot more
dirty pages (and fewer clean pages) from the cache. Forcing a
dirty page out is slower than forcing a clean page out, of course.
Is this result reasonable?
I suppose I could try to sync less often than I have been, but more often
than never to see if that makes any difference.
When I close or sync one db handle, I assume it flushes only that portion
of the dbenv's cache, not the entire cache, right? Is there an API I can
call that would sync the entire dbenv cache (besides closing the dbenv)?
Are there any other suggestions?
Thanks,
Eric -
How to remove an object from Buffer Cache
Hi,
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By the way, I did some "alter system flush shared_pool" and my objects were not removed from the Buffer Cache, and they are not in the "Keep".
Thanks In Advance,
ChristianoFurther more, you can use CACHE | NOCACHE on table level to indicate how you want Oracle handle the data blocks of said table.
http://download-west.oracle.com/docs/cd/B19306_01/server.102/b14200/statements_7002.htm#i2215507
CACHE | NOCACHE | CACHE READS
Use the CACHE clauses to indicate how Oracle Database should store blocks in the buffer cache. If you specify neither CACHE nor NOCACHE, then:
In a CREATE TABLE statement, NOCACHE is the default
In an ALTER TABLE statement, the existing value is not changed.
CACHE For data that is accessed frequently, this clause indicates that the blocks retrieved for this table are placed at the most recently used end of the least recently used (LRU) list in the buffer cache when a full table scan is performed. This attribute is useful for small lookup tables.
As a parameter in the LOB_storage_clause, CACHE specifies that the database places LOB data values in the buffer cache for faster access.
Restriction on CACHE You cannot specify CACHE for an index-organized table. However, index-organized tables implicitly provide CACHE behavior.
NOCACHE For data that is not accessed frequently, this clause indicates that the blocks retrieved for this table are placed at the least recently used end of the LRU list in the buffer cache when a full table scan is performed. NOCACHE is the default for LOB storage.
As a parameter in the LOB_storage_clause, NOCACHE specifies that the LOB value either is not brought into the buffer cache or is brought into the buffer cache and placed at the least recently used end of the LRU list. The latter is the default behavior.
Restriction on NOCACHE You cannot specify NOCACHE for an index-organized table.
CACHE READS CACHE READS applies only to LOB storage. It specifies that LOB values are brought into the buffer cache only during read operations but not during write operations. -
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 $80k/cpu?
"Prashanth " <[email protected]> wrote:
>
Hi ALL,
I am using wl:cache tag for caching purpose. My reqmnt is such that I
have to
flush the cache based on user activity.
I have tried all the combinations, but could not achieve the desired
result.
Can somebody guide me on how can we flush the cache??
TIA, Prashanth Bhat. -
What else are stored in the database buffer cache?
What else are stored in the database buffer cache except the data blocks read from datafiles?
That is a good idea.
SQL> desc v$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? -
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 -
UDT Lob buffer overflow in Initial Load
Hi All
I'm doing an intial load for one table which is having ORDIMAGE column , Here is my prm details :
====================================================================
EXTRACT INIT_FFU
-- ENVIRONMENT PROFILES
setenv (ORACLE_SID = "trfdv")
setenv (NLS_LANG = "AMERICAN_AMERICA.AR8ISO8859P6")
setenv (ORACLE_HOME = "/u01/oracle/product/10.2.0/db_2")
SETENV (NLS_DATE_FORMAT = "DD/MM/YYYY HH24:MI:SS")
-- DATABASE LOGIN
USERID gg, PASSWORD *****
-- GG PARAMETER CONFIGURATION
RMTHOST <remote_host> , MGRPORT 7809 , TCPBUFSIZE 200000000, TCPFLUSHBYTES 200000000 , COMPRESS
RMTFILE /u04/GG_TRAILS/ff , MAXFILES 9999 , MEGABYTES 100 , PURGE , FORMAT RELEASE 11.2
DBOPTIONS LOBBUFSIZE 10485760
STATOPTIONS RESETREPORTSTATS
REPORTROLLOVER AT 00:01
REPORTCOUNT EVERY 10 SECONDS, RATE
DISCARDFILE /u01/GG/dirrpt/ffu.dsc, APPEND
-- FFU TABLES
TABLE TRAFFIC.TF_FFU_RADAR_PICTURES;
====================================================================
The issue is at once it gives the following error
UDT Lob buffer overflow, needed: 19920358, allocated: 10485760
I know that the maximum is 10485760 ,
so how can I resolve this issue
GG version is 11.2.1.0.1
DB version is 10.2.0.4
Thanks In AdvanceAny Luck ...
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" 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 -
ORA-00385: cannot enable Very Large Memory with new buffer cache 11.2.0.2
[oracle@bnl11237dat01][DWH11]$ sqlplus / as sysdba
SQL*Plus: Release 11.2.0.2.0 Production on Mon Jun 20 09:19:49 2011
Copyright (c) 1982, 2010, Oracle. All rights reserved.
Connected to an idle instance.
SQL> startup mount pfile=/u01/app/oracle/product/11.2.0/dbhome_1/dbs//initDWH11.ora
ORA-00385: cannot enable Very Large Memory with new buffer cache parameters
DWH12.__large_pool_size=16777216
DWH11.__large_pool_size=16777216
DWH11.__oracle_base='/u01/app/oracle'#ORACLE_BASE set from environment
DWH12.__pga_aggregate_target=2902458368
DWH11.__pga_aggregate_target=2902458368
DWH12.__sga_target=4328521728
DWH11.__sga_target=4328521728
DWH12.__shared_io_pool_size=0
DWH11.__shared_io_pool_size=0
DWH12.__shared_pool_size=956301312
DWH11.__shared_pool_size=956301312
DWH12.__streams_pool_size=0
DWH11.__streams_pool_size=134217728
#*._realfree_heap_pagesize_hint=262144
#*._use_realfree_heap=TRUE
*.audit_file_dest='/u01/app/oracle/admin/DWH/adump'
*.audit_trail='db'
*.cluster_database=true
*.compatible='11.2.0.0.0'
*.control_files='/dborafiles/mdm_bn/dwh/oradata01/DWH/control01.ctl','/dborafiles/mdm_bn/dwh/orareco/DWH/control02.ctl'
*.db_block_size=8192
*.db_domain=''
*.db_name='DWH'
*.db_recovery_file_dest='/dborafiles/mdm_bn/dwh/orareco'
*.db_recovery_file_dest_size=7373586432
*.diagnostic_dest='/u01/app/oracle'
*.dispatchers='(PROTOCOL=TCP) (SERVICE=DWH1XDB)'
DWH12.instance_number=2
DWH11.instance_number=1
DWH11.local_listener='(DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(PROTOCOL=TCP)(HOST=bnl11237dat01-vip)(PORT=1521))))'
DWH12.local_listener='(DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(PROTOCOL=TCP)(HOST=bnl11237dat02-vip)(PORT=1521))))'
*.log_archive_dest_1='LOCATION=/dborafiles/mdm_bn/dwh/oraarch'
*.log_archive_format='DWH_%t_%s_%r.arc'
#*.memory_max_target=7226785792
*.memory_target=7226785792
*.open_cursors=1000
*.processes=500
*.remote_listener='LISTENERS_SCAN'
*.remote_login_passwordfile='exclusive'
*.sessions=555
DWH12.thread=2
DWH11.thread=1
DWH12.undo_tablespace='UNDOTBS2'
DWH11.undo_tablespace='UNDOTBS1'
SPFILE='/dborafiles/mdm_bn/dwh/oradata01/DWH/spfileDWH1.ora' # line added by Agent
[oracle@bnl11237dat01][DWH11]$ cat /etc/sysctl.conf
# Kernel sysctl configuration file for Red Hat Linux
# For binary values, 0 is disabled, 1 is enabled. See sysctl(8) and
# sysctl.conf(5) for more details.
# Controls IP packet forwarding
net.ipv4.ip_forward = 0
# Controls source route verification
net.ipv4.conf.default.rp_filter = 1
# Do not accept source routing
net.ipv4.conf.default.accept_source_route = 0
# Controls the System Request debugging functionality of the kernel
kernel.sysrq = 0
# Controls whether core dumps will append the PID to the core filename
# Useful for debugging multi-threaded applications
kernel.core_uses_pid = 1
# Controls the use of TCP syncookies
net.ipv4.tcp_syncookies = 1
# Controls the maximum size of a message, in bytes
kernel.msgmnb = 65536
# Controls the default maxmimum size of a mesage queue
kernel.msgmax = 65536
# Controls the maximum shared segment size, in bytes
kernel.shmmax = 68719476736
# Controls the maximum number of shared memory segments, in pages
#kernel.shmall = 4294967296
kernel.shmall = 8250344
# Oracle kernel parameters
fs.aio-max-nr = 1048576
fs.file-max = 6815744
kernel.shmmni = 4096
kernel.sem = 250 32000 100 128
kernel.shmmax = 536870912
net.ipv4.ip_local_port_range = 9000 65500
net.core.rmem_default = 262144
net.core.rmem_max = 4194304
net.core.wmem_default = 262144
net.core.wmem_max = 1048586
net.ipv4.tcp_wmem = 262144 262144 262144
net.ipv4.tcp_rmem = 4194304 4194304 4194304
Please can I know how to resolve this error.CAUSE: User specified one or more of { db_cache_size , db_recycle_cache_size, db_keep_cache_size, db_nk_cache_size (where n is one of 2,4,8,16,32) } AND use_indirect_data_buffers is set to TRUE. This is illegal.
ACTION: Very Large Memory can only be enabled with the old (pre-Oracle_8.2) parameters -
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
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