Buffer cache of SGA

can anyone plz clarify my doubt,it is which parameter defines the size of db buffer cache in the SGA.does db_cache_size directly defines the size or is it the size of the cache of standard blocks(specified by db_block_size parameter).

DB_BLOCK_BUFFERS specifies the number of blocks to allocate for data buffer. This parameter's value is then multiplied with DB_BLOCK_SIZE to calculate the size of the data buffer.
DB_CACHE_SIZE specifies the size value itself directly in units of KV,MB or GB. This parameter alone is enough to calculate the data buffer cache size.
DB_BLOCK_BUFFERS can only create buffer cache in units of blocks based on one parameter DB_BLOCK_SIZE. On the other hand, multiple data buffere caches can be created by using DB_nK_CACHE_SIZE parameters where n is the blocks's size of for the buffer cache. So for example, one can allocate X MB buffer cache of 8K block size and have Y MB buffer cache of 16K blocks. This helps when you have tablespaces of varying block sizes (This could not be possible using DB_BLOCK_BUFFERS as DB_BLOCK_SIZE is not modifiable).
DB_CACHE_SIZE can work along with SGA_TARGET parameter (which decides SGA size). If DB_CACHE_SIZE is 0, then it's value varies based on usage. If a value is set then that value turns out to be a minimum value. This is not possible using DB_BLOCK_BUFFERS.

Similar Messages

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.

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

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,
nvseenu

Documentation 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

Is dictionary cache double buffered (shared pool, buffer cache)

Hi,
I'm trying to get idea about how dictionary cache is buffered .
Let us say we're talking about dc_objects .
It is dba_tables view related so all underlying sys.obj$ sys.user$ ... tables block are cached in buffer cache.
So why we are caching them in dictionary cache space in shared pool additionally ?
Looks like double buffering and wasting SGA .
Please explain .
Regards
GregG

HI,
Dictionary cache will not cache data of tables, rather it will cache the structural information of table (in your case).
If i will do "select ename from emp", during statement compilation, it needs to check whether "ename" is a real column? and for this it needs to query data dictionary information (from using physical read of system data file or from data dictionary cache if information is there). It also need to check whether i have (logged in user) rights to access this table/column and all this information comes from data dictionary.
This is a simple example, otherwise dictionary cache need to store a lot of other information also (but purely the information present in data dictionary)
Salman

Buffer Cache too big?

Hello Oracle community!
I'm having issues because of my current SGA size on a Win 32-bit platform, its measures are normally on 6,811,549,696 bytes. There was another database administrator before me but he left the company, his instructions were that he setup this size because that time RAM memory was not the problem.
The OS' parameters are set to read the entire 8GB RAM.
If I set a SGA_TARGET to around 6GB, will I only have -800mb on my db and no problems at all? Is there any way to check things better than just set a SGA_TARGET and pray?
Thank you very much!

@Elios
Oracle Version 10.2.0.3.0
It's not an OLTP Database.
@mehmet eser
NAME BYTES RESIZEABLE
Fixed SGA Size 1289604 No
Redo Buffers 7098368 No
Buffer Cache Size 6442450944 Yes
Shared Pool Size 343932928 Yes
Large Pool Size 8388608 Yes
Java Pool Size 8388608 Yes
Streams Pool Size 0 Yes
Granule Size 8388608 No
Maximum SGA Size 6811549696 No
Startup overhead in Shared Pool 268435456 No
Free SGA Memory Available 0
11 rows selected
NAME VALUE
Fixed Size 1289604
Variable Size 360710780
Database Buffers 6442450944
Redo Buffers 7098368
4 rows selected
To use more than the basic on 32bit Windows I used /PAE on boot.ini.

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

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.

Data Buffer Cache!

Hi Guru(s),
Please anyone can tell me that, how can we check the size of data buffer cache.
Please help.
Regards,
Rajeev K

Hi,
Here is what I would do:
First, let's have a look what views we have available to us
SQL> select table_name from dict where table_name like '%SGA%';
TABLE_NAME
DBA_HIST_SGA
DBA_HIST_SGASTAT
DBA_HIST_SGA_TARGET_ADVICE
V$SGA
V$SGAINFO
V$SGASTAT
V$SGA_CURRENT_RESIZE_OPS
V$SGA_DYNAMIC_COMPONENTS
V$SGA_DYNAMIC_FREE_MEMORY
V$SGA_RESIZE_OPS
V$SGA_TARGET_ADVICE
GV$SGA
GV$SGAINFO
GV$SGASTAT
GV$SGA_CURRENT_RESIZE_OPS
GV$SGA_DYNAMIC_COMPONENTS
GV$SGA_DYNAMIC_FREE_MEMORY
GV$SGA_RESIZE_OPS
GV$SGA_TARGET_ADVICE
19 rows selected.v$sgainfo looks pretty promising, what does it contain?
SQL> desc v$sgainfo
Name                                                              Null?    Type
NAME                                                                       VARCHAR2(32)
BYTES                                                                      NUMBER
RESIZEABLE                                                                 VARCHAR2(3)And how many rows are in it?
SQL> select count(*) from v$sgainfo;
COUNT(*)
        12Not too many so let's look at them all, with a little formatting
SQL> select name,round(bytes/1024/1024,0) MB, resizeable from v$sgainfo order by name;Hope that helps,
Rob

How data buffer cache is handled

hi all,
I have a doubt in how buffer cache is managed.. I read that server process will read blocks from data file and keeps them in buffer cache if they are not already present in buffer cache.. Suppose two users from different sessions issue the same statement at the same time, and they are picked up by different server processes, and upon checking they will find that the block is not present in SGA, so they both will go read the block.. is it not unnecessary.. or am i wrong? please let me know how it is handled.
Regards
Suresh

Hi tinku,
I understand what you mean.. but my problem is different.
suppose there are two sessions
first session issues a statement:
Select * from emp where empno = 12;
and second session issues
select * from emp where empno in (12,13);
becoz these two statements are different, these two statements are to be parsed separately. After parsing, each of the server processes will see if the block corresponding 12 is already in memory, if it is not, they will read it from data file and keep in buffer cache.. suppose these two server processes at the same time find that the block is not in SGA and try to read the block from data file, there would be two copies of the block in SGA. isn't it. I don't think this is what is gonna happen. so i need how the server processes coordinate with each other to read only necessary blocks without redundancy.
Regards
Suresh

Buffer Cache Sizing

I'm using 9i Release 7 on Microsoft Windows Server 2003.
I have searched on metalink but I'm going around in circles confusing myself.
I have 4GB Physical RAM
SGA MAX SIZE = 2600 MB
BUFFER CACHE = 2048 MB
SHARED POOL = 256 MB
JAVA POOL = 152 MB
LARGE POOL = 16MB
Aggreagte PGA Target = 768 MB
Currently, the parameters DB_KEEP_CACHE_SIZE & DB_RECYCLE_CACHE_SIZE is 0MB
If I wish to take advantage of the DB_KEEP_CACHE_SIZE Parameter so that I can retain frequently queried data in the Buffer Cache, what would be the optimal size I can allocate for this Parameter given the SGA Size I have mentioned above.

Can I ask the reason which forced you to tune DB_KEEP_CACHE_SIZE & DB_RECYCLE_CACHE_SIZE . Is your DB not performing well , Is there any
issue raised by your users ? Is there any responce time issue ? or throughput issue ? If your DB is working fine , then there is no need to try such stuffs , you wish to use this settings , just because you read somewhere or people useally
do it, som forum user suggested me to do this.
hare krishna
Alok

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 PM

I 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.

How to tune effectively to the buffer cache hit ratio?

We have a database with following sga sizes;
shared pool : 256 MB
Buffer Cache: 880 MB
Large pool: 32 MB
Java pool: 32 MB
Total SGA: 1201.435 mb. From the health check, i found Buffer Cache Hit Ratio is giving the trouble. so, i need advice from dba gurus, should Buffer Cache Hit ratio be increase or decreasee, in order to improve the performance?
Please help me
Ateeq

I will generate statspack tommorrow morning when there will be lot of activity on the database. In the meantime, some output from Health check toad are:
->!Buffer Cache Hit Ratio : 82.3246
-->[Segments with > 100 extents] Exec Time 1 seconds
! TABLE IN_CHIYODA.SPEC_REVISION_DOCUMENT_MAIN: 107 Extents
! TABLE EF2_DATA.N3RGRPRGRP: 126 Extents
! TABLE EF2_DATA.N3OBJATTR: 192 Extents
! TABLE EF2_DATA.EFT_UID: 119 Extents
! TABLE EF2_DATA.N2FILEOBJ: 121 Extents
! TABLE EF2_DATA.N2IFOBJ: 211 Extents
! TABLE EF2_DATA.N2REVGRP: 128 Extents
! INDEX EF2_DATA.N3OBJATTR_RLTLEFTRELINDEX: 122 Extents
! INDEX EF2_DATA.N3OBJATTR_RLTRIGHTRELINDEX: 114 Extents
! INDEX EF2_DATA.PK_N3OBJATTR: 119 Extents
! INDEX EF2_DATA.EFI_UID_N1UID: 120 Extents
! INDEX EF2_DATA.EFI_UID_N1OBJOBID: 103 Extents
! INDEX EF2_DATA.N1BOBJOBID_N2IFOBJ: 186 Extents
! INDEX EF2_DATA.N2IFOBJ_N1BOBJOBID: 159 Extents
! INDEX EF2_DATA.N2IFOBJ_N1NAME: 115 Extents
! INDEX EF2_DATA.PK_N2IFOBJ: 158 Extents
! INDEX EF2_DATA.N2IFOBJ_MYINDEX: 187 Extents
Can you advice anthing based on these results.
Thanks

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

Buffer cache of SGA

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