which updates of the bitmap blocks

Hi friends,

He comes to issue credits and hope without required versions.

We know that information will be retained in the freelist freeblock / bitmap blocks. lets say taken DBWR freeblock information (either from freelist / bitmap block) and inserted a few lines in a free block. This block is now "USED BLOCK". I want to know exactly who will be updated (any background process?) the status of the block of FREE USED in freelist / bitmap block.

Thanks in advance.

Pavan - a disciple to Oracle wrote:
Hi Aman, thanks for the update. but in one of the positions, sybrand mentioned that freelist will there be in PGA.
Please refer to the free in the buffer cache blocks

+ 1) this may be different for the free lists and bitmaps. Free lists are / were stored in pga. Bitmaps I'm not sure. I need to check it out. They are stored in the database, so it is likely that they are in the buffer cache. +

can you please explain a little more...

Hmm interesting!

Well, as I don't know about Oracle at all so I can't say that its right or wrong. Sybrand is a very high and competent guy and his very rare he gets something wrong so the best would be to wait for him to come and explain it.

That said, the segment has a property called free list and this also shows in the properties of the Segment and the dictionary, _tables.  For example, look here,

SQL> select * from v$version;

BANNER
--------------------------------------------------------------------------------Oracle Database 11g Enterprise Edition Release 11.1.0.6.0 - Production
PL/SQL Release 11.1.0.6.0 - Production
CORE    11.1.0.6.0      Production
TNS for Linux: Version 11.1.0.6.0 - Production
NLSRTL Version 11.1.0.6.0 - Production
SQL>  create tablespace test datafile '/u01/app/oracle/test.dbf'
  2  size 3m
  3  segment space management manual;

Tablespace created.

SQL> create table test (a number) storage(freelists 2) tablespace test;

Table created.

SQL> select table_name, freelists from user_tables where table_name='TEST';

TABLE_NAME                      FREELISTS
------------------------------ ----------
TEST                                    2

Now, if the Freelist is created in the PGA, it would mean that his will be the specific property of the session which will be there after the closure of the session which seems wrong isn't? So in my humble OPINION, its there in the segment itself, not in the pga and so are the bitmap blocks. If you want to see them being created, you can see them.

HTH
Aman...

Tags: Database

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