Difference between keep pool Vs Recycle pool vs Default pool

Good Morning experts ;
I need some differences between Keep pool Vs Recycle pool vs Default pool.
How it acts differ from each other.
Thanks in advance ..

8f953842-815b-4d8c-833d-f2a3dd51e602 wrote:
Thanks for your answer MARG.
If i pin an object into shared pool , entire object ( all blocks) comes under into buffer pool.
but you say depending on the query plan ,
Oracle will place only portions of objects into the buffer cache at any one time.
Example :
>> TO pin a table
SQL> alter table emp storage (buffer_pool keep);
This table having 1 million record and it contains 'n' of columns.
Consider i need o/p from name , emp_id, salary columns only.
i.e. who are getting salary more than 8000$.
Oracle will show required o/p. As per your explanation , i cant guess ..
Question : how oracle will place only portions of objects into the buffer instead of entire object ?
Please elaborate little more .
Oracle uses blocks. The rows are in blocks. When you ask for a column in a row, Oracle has to get the block. When you ask for a couple of columns from many rows, Oracle has to get many blocks. Oracle makes copies of blocks. Oracle has to manage possibly many people accessing the same or different rows in those blocks. Each one needs to have the block appear as though it did when the transaction started.
Oracle has many ways to get the blocks. It can look in the SGA, if an appropriate one is not there it can read it from disk, or it may decide to read many blocks at once from a disk, or it could even decide to just read as much as it can into a user's PGA, perhaps also going to undo in any of those ways to make a read consistent copy for the user.
So when you look at statistics for a session, you might see sequential gets or scattered gets. The former is often from index access, then a single block is gotten from wherever, and placed in the SGA. The latter is often from scanning, and the blocks are scattered about, as they aren't necessarily going to be gotten in an order. Remember, an Oracle block may be a number of operating system blocks, and a multi[-oracle]-block read may be a lot of data.
So, with all these blocks going into the SGA, it has to decide what stays and what goes. It uses a least-recently-used (LRU) algorithm to eject blocks, and may read blocks into the middle or the end of the list, depending. That's why the default buffer pool works so well, anything continually accessed will in the grand scheme of things be kept hot and stay there. When SGA's were much smaller, it was a lot easier to have not-quite-so-hot things get ejected and written out, only to be read in soon after, so the alternate pools would allow those places to be kept, or recycled, as arbitrarily defined.
So think of blocks as the portion of objects in the SGA. There usually are multiple copies of blocks.

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Ms Datar,
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amitindia

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I'm sure it'll make more sense the more I work with it. Thanks.
"Chuck Nelson" <[email protected]> wrote in message
news:3dcac1f5$[email protected]..
>
Peter,
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regards

Hi,
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This section discusses the structure and special features of class and interface pools for global classes.
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Reward points if useful....
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918868 wrote:
What will Keep Buffer Pool and Recycle Buffer Pool contains actually in Database Buffer Cache, specially what type of objects? I know the definitions but need to know the practical aspects about them.I believe you have already got the answer from the experts. Just to echo the same, in any cache, either Buffer Cache(default), Keep or Recycle, its going to be data buffers which are actually the placeholders for the data blocks that are available on the disk. The default cache is going to throw away the lesser used buffers as fast as possible. And if you don't want this to happen, you can use either of the other two, indepandant caches-Recycle and Keep. The keep cache , as the name suggests would keep the buffers in it for a more loonger duration compared to the default cache. This probably would be a better idea when you know that some buffers are meant to be reused again and again. Recycle is going tobe for those, which are very seldom used and you don't want them to choke up the caches at all. For the buffers kept in the Recycle cache, they would be thrown out almost instantly.
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hi ,
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Message was edited by:
Ranjita Kar

Difference between Class Pool program and Interface Pool program

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Transparent Table :
Exists with the same structure both in dictionary as well as in database exactly with the same data and fields.
" Pooled Table :
Pooled tables are logical tables that must be assigned to a table pool when they are defined. Pooled tables are used to store control data. Several pooled tables can be cominied in a table pool. The data of these pooled tables are then sorted in a common table in the database.
" Cluster Table :
Cluster tables are logical tables that must be assigned to a table cluster when they are defined. Cluster tables can be used to strore control data. They can also be used to store temporary data or texts, such as documentation.
" what is the major difference between Standard tables, Pooled tables and
" Clusterd Tables?
A transparent table is a table that stores data directly. You can read these tables directly on the database from outside SAP with for instance an SQL statement.
Transparent table is a one to one relation table i.e. when you create one transparent table then exactly same table will create in data base and if is basically used to store transaction data.
A clustered and a pooled table cannot be read from outside SAP because certain data are clustered and pooled in one field.
One of the possible reasons is for instance that their content can be variable in length and build up. Database manipulations in Abap are limited as well.
But pool and cluster table is a many to one relationship table. This means many pool table store in a database table which is know as table pool.
All the pool table stored table in table pool does not need to have any foreign key relationship but in the case of cluster table it is must. And pool and cluster table is basically use to store application data.
Table pool can contain 10 to 1000 small pool table which has 10 to 100 records. But cluster table can contain very big but few (1 to 10) cluster table.
For pool and cluster table you can create secondary index and you can use select distinct, group for pool and cluster table. You can use native SQL statement for pool and cluster table.
A structure is a table without data. It is only filled by program logic at the moment it is needed starting from tables.
A view is a way of looking at the contents of tables. It only contains the combination of the tables at the basis and the way the data needs to be represented. You actually call directly upon the underlying tables.
. Transparent tables (BKPF, VBAK, VBAP, KNA1, COEP)
Allows secondary indexes (SE11->Display Table->Indexes)
Can be buffered (SE11->Display Table->technical settings) Heavily updated tables should not be buffered.
II. Pool Tables (match codes, look up tables)
Should be accessed via primary key or
Should be buffered (SE11->Display Table->technical settings)
No secondary indexes
Select * is Ok because all columns retrieved anyway
III. Cluster Tables (BSEG,BSEC)
Should be accessed via primary key - very fast retrieval otherwise very slow
No secondary indexes
Select * is Ok because all columns retrieved anyway.
Performing an operation on multiple rows is more efficient than single row operations.
Therefore you still want to select into an internal table.
If many rows are being selected into the internal table,
you might still like to retrieve specific columns to cut down on the memory required.
Statistical SQL functions (SUM, AVG, MIN, MAX, etc) not supported
Can not be buffered
IV. Buffered Tables (includes both Transparent & Pool Tables)
While buffering database tables in program memory (SELECT into internal table) is generally a good idea for performance,
it is not always necessary.
Some tables are already buffered in memory.
These are mostly configuration tables.
If a table is already buffered, then a select statement against it is very fast.
To determine if a table is buffered, choose the 'technical settings' soft button from the data dictionary
display of a table (SE12). Pool tables should all be buffered.
More at this link.
http://help.sap.com/saphelp_erp2004/helpdata/en/81/415d363640933fe10000009b38f839/frameset.htm
Transparent Table:
Exists with the same structure both in dictionary as well as in database exactly with the same data and fields.
Pooled Table:
Pooled tables are logical tables that must be assigned to a table pool when they are defined. Pooled tables are used to store control data. Several pooled tables can be cominied in a table pool. The data of these pooled tables are then sorted in a common table in the database.
Cluster Table:
Cluster tables are logical tables that must be assigned to a table cluster when they are defined. Cluster tables can be used to strore control data. They can also be used to store temporary data or texts, such as documentation.
A transparent table is a table that stores data directly. You can read these tables directly on the database from outside SAP with for instance an SQL statement.
Transparent table is a one to one relation table i.e. when you create one transparent table then exactly same table will create in data base and if is basically used to store transaction data.
A clustered and a pooled table cannot be read from outside SAP because certain data are clustered and pooled in one field.
One of the possible reasons is for instance that their content can be variable in length and build up. Database manipulations in Abap are limited as well.
But pool and cluster table is a many to one relationship table. This means many pool table store in a database table which is know as table pool.
All the pool table stored table in table pool does not need to have any foreign key relationship but in the case of cluster table it is must. And pool and cluster table is basically use to store application data.
Table pool can contain 10 to 1000 small pool table which has 10 to 100 records. But cluster table can contain very big but few (1 to 10) cluster table.
For pool and cluster table you can create secondary index and you can use select distinct, group for pool and cluster table. You can use native SQL statement for pool and cluster table.
A structure is a table without data. It is only filled by program logic at the moment it is needed starting from tables.
A view is a way of looking at the contents of tables. It only contains the combination of the tables at the basis and the way the data needs to be represented. You actually call directly upon the underlying tables.
http://www.datamanagementgroup.com/Resources/Articles/Article_0106_2.asp
more info
http://help.sap.com/saphelp_erp2004/helpdata/en/81/415d363640933fe10000009b38f839/frameset.htm
http://cma.zdnet.com/book/abap/ch03/ch03.htm
Check this links.
http://help.sap.com/saphelp_40b/helpdata/en/4f/991f82446d11d189700000e8322d00/applet.htm
http://www.techinterviews.com/?p=198

Difference between Datasource and Connection Pool

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What is the major difference between Datasource and Connection Pool.
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