A Question for the Experts of the SAMS

Hello

Version Oracle 10.2.0.4
16 k block size
I have a managed tablespace locally, with volume of uniform measurement of 128 k and SSM set to AUTO. My tablespace is called rj_test_X128K in the following test:
dba@TEST> create table dba.rj_del_ins_test
  2  tablespace rj_test_X128K
  3  as
  4  select *
  5  from table
  6  where PK_COL > 1135268669
  7  and PK_COL is not null;
 
Table created.
 
dba@TEST> exec dbms_stats.gather_table_stats('dba', tabname=>'RJ_DEL_INS_TEST',estimate_percent => 100, method_opt => 'FOR ALL COLUMNS SIZE 1', cascade=>TRUE);
 
PL/SQL procedure successfully completed.
 
dba@TEST> select TABLE_NAME, FREELISTS, NUM_ROWS, BLOCKS, EMPTY_BLOCKS, AVG_SPACE, AVG_ROW_LEN, NUM_FREELIST_BLOCKS
  2  from dba_tables
  3  where table_name = 'RJ_DEL_INS_TEST';
 
TABLE_NAME                      FREELISTS   NUM_ROWS     BLOCKS EMPTY_BLOCKS  AVG_SPACE AVG_ROW_LEN NUM_FREELIST_BLOCKS
------------------------------ ---------- ---------- ---------- ------------ ---------- ----------- -------------------
RJ_DEL_INS_TEST                                84217        868            0          0         141           0
 
dba@TEST> delete from dba.rj_del_ins_test
  2  where PK_COL > 1135268669
  3  and mod(PK_COL,20) = 10;
 
4143 rows deleted.
 
dba@TEST> commit;
 
Commit complete.
 
dba@TEST> exec dbms_stats.gather_table_stats('dba', tabname=>'RJ_DEL_INS_TEST',estimate_percent => 100, method_opt => 'FOR ALL COLUMNS SIZE 1', cascade=>TRUE);
 
PL/SQL procedure successfully completed.
 
dba@TEST> select TABLE_NAME, FREELISTS, NUM_ROWS, BLOCKS, EMPTY_BLOCKS, AVG_SPACE, AVG_ROW_LEN, NUM_FREELIST_BLOCKS
  2  from dba_tables
  3  where table_name = 'RJ_DEL_INS_TEST';
 
TABLE_NAME                      FREELISTS   NUM_ROWS     BLOCKS EMPTY_BLOCKS  AVG_SPACE AVG_ROW_LEN NUM_FREELIST_BLOCKS
------------------------------ ---------- ---------- ---------- ------------ ---------- ----------- -------------------
RJ_DEL_INS_TEST                                80074        868            0          0         141           0
 
dba@TEST> insert into dba.rj_del_ins_test
  2  select *
  3  from table
  4  where PK_COL > 1135268669
  5  and PK_COL is not null
  6  and mod(PK_COL,20) = 6;
 
4277 rows created.
 
dba@TEST> commit;
 
Commit complete.
 
dba@TEST>
dba@TEST> exec dbms_stats.gather_table_stats('dba', tabname=>'RJ_DEL_INS_TEST',estimate_percent => 100, method_opt => 'FOR ALL COLUMNS SIZE 1', cascade=>TRUE);
 
PL/SQL procedure successfully completed.
 
dba@TEST> select TABLE_NAME, FREELISTS, NUM_ROWS, BLOCKS, EMPTY_BLOCKS, AVG_SPACE, AVG_ROW_LEN, NUM_FREELIST_BLOCKS
  2  from dba_tables
  3  where table_name = 'RJ_DEL_INS_TEST';
 
TABLE_NAME                      FREELISTS   NUM_ROWS     BLOCKS EMPTY_BLOCKS  AVG_SPACE AVG_ROW_LEN NUM_FREELIST_BLOCKS
------------------------------ ---------- ---------- ---------- ------------ ---------- ----------- -------------------
RJ_DEL_INS_TEST                                84351        911            0          0         141           0
I noticed that the number of blocks increases even though I'm only insert additional lines very little - 134 to be exact. Using the length of middle line of 141, which takes me to 134 * 141 = 18894bytes; a little more 1 block. I have an increase of 43 blocks. No idea why?

I understand that there is a general fresh management regarding the use of space when you use SAMS, but I don't understand why there is such an increase in the number of blocks when I would have thought that the blocks were already allocated in the initial table creation phase. If I had inserted thousands of lines, I would have understood the jump in the use of block, but not with 134.

Here are the results of the DBMS_SPACE. Procedure SPACE_USAGE
UNF         0
      UNFB         0
       FS4         0
      FS4B         0
       FS3         0
      FS3B         0
       FS2         0
      FS2B         0
       FS1         2
      FS1B     32768
      FULL       891
     FULLB  14598144
FS1
 Number of blocks that has at least 0 to 25% free space
FS1B
 Number of bytes that has at least 0 to 25% free space
FULL
 Total number of blocks that are full in the segment
FULLB
 Total number of bytes that are full in the segment
I used the DBMS_SPACE. Procedure UNUSED_SPACE and got these results:
TOTAL_BLOCKS    912
TOTAL_BYTES        14942208
UNUSED_BLOCKS   0
UNUSED_BYTES    0
  LASTEXTF      251
 LAST_EXTB      909
LASTUSEDBLOCK   8

Definitions taken from the docs:

total_blocks
 Returns total number of blocks in the segment.
total_bytes
 Returns total number of blocks in the segment, in bytes.
unused_blocks
 Returns number of blocks which are not used.
unused_bytes
 Returns, in bytes, number of blocks which are not used.
last_used_extent_ file_id
 Returns the file ID of the last extent which contains data.
last_used_extent_ block_id
 Returns the starting block ID of the last extent which contains data.
last_used_block
 Returns the last block within this extent which contains data.
Following this, here is how the stats are the deletion and insertion, shown in two steps:
##############
# After deletion
##############

FULL      850
FULLB     13926400

TOTAL_BLOCKS              872
TOTAL_BYTES             14286848
UNUSED_BLOCKS           4
UNUSED_BYTES            65536
LASTEXTF                 251
LAST_EXTB            869
LASTUSEDBLOCK            4

109 extents

  NUM_ROWS     BLOCKS
---------- ----------
     80074        868

##########
# After Insert
##########

FS1              1
FS1B          16384
FULL            892
FULLB           14614528

TOTAL_BLOCKS              912
TOTAL_BYTES             14942208
UNUSED_BLOCKS           0
UNUSED_BYTES                0
LASTEXTF                 251
LAST_EXTB            909
LASTUSEDBLOCK           8

114 extents

 NUM_ROWS     BLOCKS
--------- ----------
    84351        911
So, can someone get to explaining why this is happening?
Or maybe some additional tests I can do to see what blocks are used for?

Thank you
SoC

Rob_J wrote:
As you can see, TEST 2 shows that, when you use the representative settings for PCTFREE and PCTUSED in MSSM to those of the SAMS, we get a result comparable to the use of SAMS.

So, regardless of what I set PCTFREE to SAMS tablespace in a block must still have more than 25% of free space to be a candidate for the new pads?

Not exactly - I think it is the next "Freeness" below PCTFREE, so if PCTFREE is for example 26%, then the block must have at least 50% free for its status as a 'FULL' erased and become a candidate for inclusion. PCTFREE under 25, Yes, then at least 25% I guess.

Is it possible to change this behavior is this just a call, you have to take for the use of SAMS or y at - it a logical reason behind what I missed?

Well, I guess that's what you get with segments 'AUTO' managed by magic - if the theory is correct, you can try a PCTFREE of 24 or 25 (not sure of the border), then several blocks should become eligible for the status of compensation when deleting lines. Of course, it's different from what you can achieve with MSSM - you are reserving more space for the growth future line with PCTFREE 25.

Remember that the default PCTUSED is 40 for MSSM if you do specify not her - so the default behavior of the SAMS with 10 PCTFREE is already more aggressive towards provision for blocks compared to default MSSM insertions.

You must also consider that SAMS was designed especially for the systems highly concurrent OLTP (and CARS) which deals, so there are many other considerations to take into account, as the way in which SAMS affects free to the various processes blocks and restraint potential reliefs on the segment header (similar to the use of FREELISTs and FREELIST groups with MSSM).

Kind regards
Randolf

Oracle related blog stuff:
http://Oracle-Randolf.blogspot.com/

Co-author of the forthcoming "OakTable Expert Oracle practices" book:
http://www.Apress.com/Book/view/1430226684
http://www.Amazon.com/Expert-Oracle-practices-database-administration/DP/1430226684

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