Storage Parameter - PCTFREE & PCTUSED

My question is regarding storage parameter PCTFREE and PCTUSED. I have little bit confusion to determine PCTUSED calculation.
Suppose we set PCTFREE 20% and PCTUSED 50%. Initially, a block is empty, an INSERT fill free space 30% and after this UPDATE fill 20% reserved PCTFREE space.
My question is, the block will be available for new INSERT.
Thank

asif.maqbool wrote:
Thanks Aman for sending links. I read and understood. But I'd like to know the block availability. Do we consider filled PCTFREE space to calculate PCTUSED space?Are you sure that you read the link?
The block's availability is based on the PCTUSED marker (only in the Manual Segment Space Management). PCTFREE is going to be a reserved space for the subsequent updates.
This diagram should clear the concept.
http://docs.oracle.com/cd/E11882_01/server.112/e25789/logical.htm#BABHHIDA
My understanding is PCTUSED percentage only for new insert and the block is available until PCTUSED to reach specified percentage doesn't matter PCTFREE filled or not. A PCTFREE percentage is a separate space allocation in the block that we do not consider for PCTUSED space. If we set 20% PCTFREE and 50% PCTUSED so, we will use the over all 70% of a block space 20% for UPDATE and 50% for new INSERT.Wrong! Please read and re-read the given links.
I'd appreciate if you or anyone to correct my concept if there is something wrong.Though its not going to be of much use right now as you are not clear with the basic concepts , this link should help in knowing the idea behind calculation required to set the parameters(only for MSSM) ,
http://asktom.oracle.com/pls/asktom/f?p=100:11:::::P11_QUESTION_ID:733825532206
Aman....

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(PCTFREE, PCTUSED) and Storage parameters

HI,
I am confused about (PCTFREE, PCTUSED) and Storage parameters(initial, next, pctincrease etc.)
As far as i have read PCTFREE and PCTUSED are used to control free and used space in a datablock and also these parameters related to Manual segment space management in Locally managed tablespace(i.e we need to manually set and tune these parameters). Whether these parameter are used in Dictionary managed tablespace or not?
Also, Storage parameters(intital, next, PCTUSED etc) are used in Dictionary managed tablespace. But in locally managed tablespaces how they are set as i have read we need not set these in locally managed tablespaces.
So, can you explain me about differences of these parameters with regard to Locally and Dictionary managed tablespaces in Oracle 9i and 10g platform on RHEL.

Hi,
Locally Managed Tablespace :-
A tablespace that can manage extent allocation by itself is called locally managed tablespace.
Using the bitmap in each datafile to keep track of the freed or used status of blocks in that datafile.
Each bit in the bitmap corresponds to a block or a group of blocks.
When an extent is allocated or freed for reuse, Oracle changes the bitmap values to show the new status of the blocks.
These changes do not generate rollback information because they do not update tables in the data dictionary.
Now remember, storage parameters
NEXT,
PCTINCREASE,
MINEXTENTS,
MAXEXTENTS, and
DEFAULT STORAGE are not valid for extents that are managed locally
Extents allocated in LMT :-
LMT have extent sizes either UNIFORM or variable extent sizes
For UNIFORM extents you can specify an extent size. The default size is 1MB.
and for AUTOALLOCATE extents you can specify the size of the initial extent and Oracle determines the optimal size of the additional extents, with a minimum extent size of 64KB
Example :-
Extent of uniform size
CREATE TABLESPACE test
DATAFILE 'tet.dbf'
EXTENT MANAGEMENT LOCAL
UNIFORM SIZE 256K;
Specifying Segment Space Management in Locally Managed Tablespaces
When you create a locally managed tablespace using the CREATE TABLESPACE statement, the SEGMENT SPACE MANAGEMENT clause allows you to specify how free and used space within a segment is to be managed.
MANUAL (MSSM) :- refers to oracle use free lists for managing free space within segments
because of the need to specify and tune the PCTUSED, FREELISTS, and FREELISTS GROUPS storage parameters for schema objects created in the tablespace
AUTO :-
Oracle use bitmaps to manage the free space within segments- automatic segment-space management
(ASSM)
Example :-
CREATE TABLESPACE lmtbsb DATAFILE '/u02/oracle/data/lmtbsb01.dbf' SIZE 50M
EXTENT MANAGEMENT LOCAL - LMT
SEGMENT SPACE MANAGEMENT AUTO; - ASSM
- DMT :-
Example :-
CREATE TABLESPACE tbsb
DATAFILE '/u02/oracle/data/tbsa01.dbf' SIZE 50M
EXTENT MANAGEMENT DICTIONARY -- specified how to manag the extent in DB
DEFAULT STORAGE (
INITIAL 50K
NEXT 50K
MINEXTENTS 2
MAXEXTENTS 50
PCTINCREASE 0); -- you have specified how extents in memory should increase
In the above example you have created dmt and specified the storage parameter for Extents, that is
how they much allocated as data get inserted in to the segments(tables) .
refer : http://www.mpi-inf.mpg.de/departments/d5/teaching/ss05/is05/oracle/server.920/a96521/tspaces.htm#636
- Pavan Kumar N
Oracle 9i/10g - OCP
http://oracleinternals.blogspot.com/

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Hi
Do u have data in the DSO?
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The OPTIMAL storage parameter in the rollback segment

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in metalink note Subject: ORA-01555 "Snapshot too old" in Very Large Databases (if using Rollback Segments)
Doc ID: 45895.1
I see :
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PSAPTEMP default storage (Parameter settings)

Hi there,
I am trying to increase INITIAL and NEXT values for default setting of PSAPTEMP. Using sapdba version 9, under Tablespace, when I select the INITIAL and change value, the value gets reset to default 1024K. How can I extend these values. Do I need to drop and recreate or can I do it online.
Regards,
Jeet

Dear Jeet,
first of all: don't use sapdba anymore.
It's not developed anymore and the recommendated tool is now br*tools.
See note
12741 - Current versions of SAPDBA and BR*Tools
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SQL> select tablespace_name, EXTENT_MANAGEMENT, ALLOCATION_TYPE, SEGMENT_SPACE_M
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Message was edited by:
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Message was edited by:
Anil Kumar Sharma
Message was edited by:
Anil Kumar Sharma

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Edited by: prathapkutty on Aug 4, 2011 1:38 PM

STORAGE parameter in CREATE TABLESPACE

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Storage Parameter - PCTFREE & PCTUSED

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