Number of blocks of Table

Hello

I have a table T, and it has 30 rows.

I put the command:

Select

Count (*) "number of lines"

DBMS_ROWID. ROWID_BLOCK_NUMBER (ROWID) 'block No. '.

Of

t

Group

DBMS_ROWID. ROWID_BLOCK_NUMBER (ROWID)

and Oracle gave me the block number 663 that all rows are in the block.

Also, I used user_tables, dbms_space.space_usage, dbms_space.unused_space

to check the number of used blocks and the number of unused blocks

The result makes me confused because the number of blocks in rowid_block_number() - 1 - is different

from user_tables, dbms_space.space_usage () - 5.

If 5 is the correct number of blocks, why isn't the value of the empty_blocks column in user_tables 3?

(The total in table T blocks would have the value 8, according to dbms_space.unused_space (),

and blocks are 5, so 8-5 = 3)

Can someone tell me the difference in the value of the blocks, free blocks and total blocks between the view and the functions?

Thanks in advance.

bandicam 2015-03-29 12-44-23-414.png

bandicam 2015-03-29 12-44-35-343.png

Under Oracle SAMS usually formats 16 blocks at once, but since you use the allocated system extensions the first measure is only 8 blocks so the whole extent is formatted.

As the 1 degree in the segment, the 3 first blocks are the space management (level 1 bitmap, bitmap image in level 2, segment header) leaving you 5 blocks that are formatted and 100% free space and you have then inserted you stored in the pseudo (-) randomly selected last block of scale - leaving you with 4 blocks to 100% of free space and a partially filled block.

Concerning

Jonathan Lewis

Tags: Database

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    ---------------------------------------------------------------------------------------------------------------------------------------------------

    | ID | Operation | Name                          | Begins | E - lines. A - lines.   A - time | Pads | Bed |  OMem |  1Mem | Used Mem.

    ---------------------------------------------------------------------------------------------------------------------------------------------------

    |   0 | SELECT STATEMENT |                               |      1.        |      0 | 00:01:20.23 |     481K |    481K |       |       |          |

    |*  1 |  HASH JOIN |                               |      1.  50351 |      0 | 00:01:20.23 |     481K |    481K |  7902K |  2074K | 7997K (0) |

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    |*  5 |   TABLE ACCESS FULL | INS_COMMON_PARTY |      1.    616K |      0 | 00:01:18.71 |     478K |    478K |       |       |          |

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    1 - access("THIS_".") PARTY_PK "= 'PARTY1_'." PK")

    2 - access("THIS_".") FOLDER_ID '= 'THIS_1_'.' FOLDER_ID")

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    WAITING #11529215045786738576: nam = "direct path read" ela = file number 5619 = 27 dba first 1695088 block cnt = 16 obj = #= 19115 tim = 4076488005225

    WAITING #11529215045786738576: nam = "direct path read" ela = 33322 file number = 26 dba first 758658 block cnt = 14 obj = #= 19115 tim = 4076488044875

    WAITING #11529215045786738576: nam = "direct path read" ela = 2140 file number = 26 dba first 758672 block cnt = 16 obj = #= tim 19115 = 4076488053342

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    WAITING #11529215045786738576: nam = "direct path read" ela = 123 file number = 9 first dba = 1449 block cnt = 15 obj #= 19076 tim = 4076488107616

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    WAITING #11529215045786738576: nam = "direct path read" ela = file number 11326 = 9 first dba = 1481 block cnt = 15 obj #= 19076 tim = 4076488120464

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    WAITING #11529215045786738576: nam = "direct path read" ela = 1382 file number = 9 first dba = 1513 block cnt = 15 obj #= 19076 tim = 4076488125037

    WAITING #11529215045786738576: nam = "direct path read" ela = 799 file = 9 first dba = 1529 block cnt = 7 obj #= 19076 tim = 4076488126162

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    WAITING #11529215045786738576: nam = "direct path read" ela = file number 3486 = 19 dba first 52992 block cnt = 16 obj = #= 19076 tim = 4076492061390

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    .......................................................

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    The column entitled "bed" is the number of blocks read, not the number of read requests.

    Concerning

    Jonathan Lewis

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    SY.

    Post edited by: SolomonYakobson

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

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    ----------------------------------------------------------                      
    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 |      
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    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                                                     
    
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    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 |      
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    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                                                     
    
                                             
    
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    Execution Plan
    ----------------------------------------------------------                      
    Plan hash value: 1950795681                                                     
                                                                                    
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    | Id  | Operation          | Name | Rows  | Cost (%CPU)| Time     |             
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    |   2 |   TABLE ACCESS FULL| TEST |  1000 |     2   (0)| 00:00:01 |             
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    ----------------------------------------------------------                      
              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                                                     
    
                                                  
    
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    Execution Plan
    ----------------------------------------------------------                      
    Plan hash value: 735384656                                                      
                                                                                    
    --------------------------------------------------------------------------------
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    | Id  | Operation             | Name    | Rows  | Bytes | Cost (%CPU)| Time     
    |                                                                               
                                                                                    
    --------------------------------------------------------------------------------
    -                                                                               
                                                                                    
    |   0 | SELECT STATEMENT      |         |     1 |     4 |     2   (0)| 00:00:01 
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              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                                   
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              0  sorts (disk)                                                       
              1  rows processed                                                     
    
                                              
    
    SQL> SELECT COUNT(ID) FROM TEST WHERE ID IS NOT NULL;
    
    Execution Plan
    ----------------------------------------------------------                      
    Plan hash value: 735384656                                                      
                                                                                    
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    | Id  | Operation             | Name    | Rows  | Bytes | Cost (%CPU)| Time     
    |                                                                               
                                                                                    
    --------------------------------------------------------------------------------
    -                                                                               
                                                                                    
    |   0 | SELECT STATEMENT      |         |     1 |     4 |     2   (0)| 00:00:01 
    |                                                                               
                                                                                    
    |   1 |  SORT AGGREGATE       |         |     1 |     4 |            |          
    |                                                                               
                                                                                    
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    |                                                                               
                                                                                    
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    Predicate Information (identified by operation id):                             
    ---------------------------------------------------                             
                                                                                    
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              5  consistent gets                                        >>  there have 5  consistent gets             
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              0  redo size                                                          
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              0  sorts (memory)                                                     
              0  sorts (disk)                                                       
              1  rows processed                                                     
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    Aman...

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