What gets the relationship between the number of blocks and coherent?

SQL> CREATE TABLE TEST(ID INT ,NAME VARCHAR2(10));

SQL> CREATE INDEX IND_IDN ON TEST(ID);

SQL> BEGIN
  2  FOR I IN 1 .. 1000
  3  LOOP
  4  EXECUTE IMMEDIATE 'INSERT INTO TEST VALUES('||I||',''LONION'')';
  5  END LOOP;
  6  COMMIT;
  7  END;
  8  /

SQL> EXEC DBMS_STATS.GATHER_TABLE_STATS(USER,'TEST',CASCADE=>TRUE);

SQL> SELECT DISTINCT DBMS_ROWID.rowid_block_number(ROWID) BLOCKS FROM TEST;
BLOCKS
-----------
61762
61764
61763         

           >> above , there have 3 blocks in table TEST .

SQL> SET AUTOTRACE TRACEONLY;                                     

SQL> SELECT * FROM TEST;

Execution Plan
----------------------------------------------------------                      
Plan hash value: 1357081020                                                     
                                                                                
--------------------------------------------------------------------------      
| Id  | Operation         | Name | Rows  | Bytes | Cost (%CPU)| Time     |      
--------------------------------------------------------------------------      
|   0 | SELECT STATEMENT  |      |  1000 | 10000 |     2   (0)| 00:00:01 |      
|   1 |  TABLE ACCESS FULL| TEST |  1000 | 10000 |     2   (0)| 00:00:01 |      
--------------------------------------------------------------------------      


Statistics information
----------------------------------------------------------                      
          0  recursive calls                                                    
          0  db block gets                                                      
         72  consistent gets                                    >>  there have 72  consistent gets                  
          0  physical reads                                                     
          0  redo size                                                          
      24957  bytes sent via SQL*Net to client                                   
       1111  bytes received via SQL*Net from client                             
         68  SQL*Net roundtrips to/from client                                  
          0  sorts (memory)                                                     
          0  sorts (disk)                                                       
       1000  rows processed                                                     

SQL> SELECT /*+ INDEX_FFS(TEST IND_IDN)*/ * FROM TEST WHERE ID IS NOT NULL;

Execution Plan
----------------------------------------------------------                      
Plan hash value: 1357081020                                                     
                                                                                
--------------------------------------------------------------------------      
| Id  | Operation         | Name | Rows  | Bytes | Cost (%CPU)| Time     |      
--------------------------------------------------------------------------      
|   0 | SELECT STATEMENT  |      |  1000 | 10000 |     2   (0)| 00:00:01 |      
|*  1 |  TABLE ACCESS FULL| TEST |  1000 | 10000 |     2   (0)| 00:00:01 |      
--------------------------------------------------------------------------      
                                                                                
Predicate Information (identified by operation id):                             
---------------------------------------------------                             
                                                                                
   1 - filter("ID" IS NOT NULL)                                                 


Statistics information
----------------------------------------------------------                      
          1  recursive calls                                                    
          0  db block gets                                                      
         72  consistent gets                                   >>  there have 72  consistent gets                  
          0  physical reads                                                     
          0  redo size                                                          
      17759  bytes sent via SQL*Net to client                                   
       1111  bytes received via SQL*Net from client                             
         68  SQL*Net roundtrips to/from client                                  
          0  sorts (memory)                                                     
          0  sorts (disk)                                                       
       1000  rows processed                                                     

                                         

SQL> SELECT COUNT(*) FROM TEST;

Execution Plan
----------------------------------------------------------                      
Plan hash value: 1950795681                                                     
                                                                                
-------------------------------------------------------------------             
| Id  | Operation          | Name | Rows  | Cost (%CPU)| Time     |             
-------------------------------------------------------------------             
|   0 | SELECT STATEMENT   |      |     1 |     2   (0)| 00:00:01 |             
|   1 |  SORT AGGREGATE    |      |     1 |            |          |             
|   2 |   TABLE ACCESS FULL| TEST |  1000 |     2   (0)| 00:00:01 |             
-------------------------------------------------------------------             

Statistics information
----------------------------------------------------------                      
          0  recursive calls                                                    
          0  db block gets                                                      
          5  consistent gets                                      >>  there have 5  consistent gets               
          0  physical reads                                                     
          0  redo size                                                          
        408  bytes sent via SQL*Net to client                                   
        385  bytes received via SQL*Net from client                             
          2  SQL*Net roundtrips to/from client                                  
          0  sorts (memory)                                                     
          0  sorts (disk)                                                       
          1  rows processed                                                     

                                              

SQL> SELECT COUNT(*) FROM TEST WHERE ID IS NOT NULL;

Execution Plan
----------------------------------------------------------                      
Plan hash value: 735384656                                                      
                                                                                
--------------------------------------------------------------------------------
-                                                                               
                                                                                
| Id  | Operation             | Name    | Rows  | Bytes | Cost (%CPU)| Time     
|                                                                               
                                                                                
--------------------------------------------------------------------------------
-                                                                               
                                                                                
|   0 | SELECT STATEMENT      |         |     1 |     4 |     2   (0)| 00:00:01 
|                                                                               
                                                                                
|   1 |  SORT AGGREGATE       |         |     1 |     4 |            |          
|                                                                               
                                                                                
|*  2 |   INDEX FAST FULL SCAN| IND_IDN |  1000 |  4000 |     2   (0)| 00:00:01 
|                                                                               
                                                                                
--------------------------------------------------------------------------------
-                                                                               
                                                                                                                                                            
Predicate Information (identified by operation id):                             
---------------------------------------------------                             
                                                                                
   2 - filter("ID" IS NOT NULL)                                                 


Statistics information
----------------------------------------------------------                      
          0  recursive calls                                                    
          0  db block gets                                                      
          5  consistent gets                                                >>  there have 5 consistent gets     
          0  physical reads                                                     
          0  redo size                                                          
        408  bytes sent via SQL*Net to client                                   
        385  bytes received via SQL*Net from client                             
          2  SQL*Net roundtrips to/from client                                  
          0  sorts (memory)                                                     
          0  sorts (disk)                                                       
          1  rows processed                                                     

                                          

SQL> SELECT COUNT(ID) FROM TEST WHERE ID IS NOT NULL;

Execution Plan
----------------------------------------------------------                      
Plan hash value: 735384656                                                      
                                                                                
--------------------------------------------------------------------------------
-                                                                               
                                                                                
| Id  | Operation             | Name    | Rows  | Bytes | Cost (%CPU)| Time     
|                                                                               
                                                                                
--------------------------------------------------------------------------------
-                                                                               
                                                                                
|   0 | SELECT STATEMENT      |         |     1 |     4 |     2   (0)| 00:00:01 
|                                                                               
                                                                                
|   1 |  SORT AGGREGATE       |         |     1 |     4 |            |          
|                                                                               
                                                                                
|*  2 |   INDEX FAST FULL SCAN| IND_IDN |  1000 |  4000 |     2   (0)| 00:00:01 
|                                                                               
                                                                                
--------------------------------------------------------------------------------
-                                                                               
                                                                                                                                                          
Predicate Information (identified by operation id):                             
---------------------------------------------------                             
                                                                                
   2 - filter("ID" IS NOT NULL)                                                 


Statistics information
----------------------------------------------------------                      
          0  recursive calls                                                    
          0  db block gets                                                      
          5  consistent gets                                        >>  there have 5  consistent gets             
          0  physical reads                                                     
          0  redo size                                                          
        409  bytes sent via SQL*Net to client                                   
        385  bytes received via SQL*Net from client                             
          2  SQL*Net roundtrips to/from client                                  
          0  sorts (memory)                                                     
          0  sorts (disk)                                                       
          1  rows processed                                                     
QUESTION:

What gets the relationship between the number of blocks and coherent? How to calculate become consistent?

You can see that your uniform is getting down to 6 to 12, is it not? Reading of the below thread Asktom.
http://asktom.Oracle.com/pls/Apex/f?p=100:11:0:P11_QUESTION_ID:880343948514

Aman...

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