the blocks are different in dba_extents and dba_tables

I was checking space for specific tables and found something intresting on column of blocks in different tables/views.

In dba_tables. I checked this table is to have a block 496 according to dba_tables and 512 blocks according to dba_extents.

Here is the code and output.

SELECT TABLE_NAME,

NOM_TABLESPACE,

NUM_ROWS,

BLOCKS,

AVG_ROW_LEN,

SAMPLE_SIZE,

LAST_ANALYZED

FROM dba_tables

WHERE

table_name = "DLR_DETAILS_TEST";

output

DLR_DETAILS_TEST DATA01 32853 496 31 32853 13/03/2014 22:01:33

And Query #2

Select dba_extents bytes, nom_segment, blocks

where nom_segment = 'DLR_DETAILS_TEST' and owner = 'HR ';

output a long list and in excel I found there a total of 512 blocks.

Just a curious question IS WHY THAT?

OS: linux redhat 6

DB: Oracle Database 11 g Enterprise Edition Release 11.2.0.3.0 - 64 bit Production

Thank you.

Column of blocks in dba_segments/dba_extents show used + unused blocks. (It depends on the allocation of storage for that object).

With AUTOALLOCATE extent management, Oracle uses the INITIAL setting to optimize the number of allocated extents. Extensions of 64K, 1 M, 8M and 64 M may be allocated.

If your db_block_size = 8 k, then the segment with 1 shows 64 k/db_block_size measure that comes to 8 blocks. Similarly, we can calculate in other cases as well.

Column of blocks in dba_tables show reserved blocks.

Tags: Database

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