How this tablespace can increment by 256K when the uniform extent size is 4MB?

DB version: 11.2.0.4

Platform: Oracle Linux 6.5

Test performed in a database RAC 2 nodes

I created a tablespace with uniform measurement of 4 MB size.

And later, when I added a data file with INCREMENT of 256K (AUTOEXTEND ON NEXT 256 KB ), I was hoping that it would be a mistake because the size of the measurement itself is 4 MB in size so the INCREMENT_BY should be at least 4 MB in size. But there is no error. No idea why?

SQL > create tablespace TEST_TS3 datafile '+ DATA_DG' size 25G

autoextend on

MaxSize 32767 m

Local extended management

single 4 m size

Auto segment space management;  2 3 4 5 6

Created tablespace.

SQL > select BLOCK_SIZE, INITIAL_EXTENT/1024/1024, 1024/1024/NEXT_EXTENT from dba_tablespaces where nom_tablespace = 'TEST_TS3 ';

BLOCK_SIZE, INITIAL_EXTENT/1024/1024/1024/1024 NEXT_EXTENT

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

8192                        4                     4

-Just found out that the default INCREMENT size is 100 MB (at least in 11.2.0.4)

SQL > select FILE_NAME, BYTES/power (1024,3) BytesInGB, increment_by INCREMENT_BY_BLOCKS, (increment_by * 8192) /power (1024,2) IncrementByInMB

2 of dba_data_files where nom_tablespace = 'TEST_TS3 ';

FILE_NAME BYTESINGB INCREMENT_BY_BLOCKS INCREMENTBYINMB

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

25 12800 100 +DATA_DG/hrcpdas/datafile/test_ts3.413.887991171

SQL > ALTER TABLESPACE TEST_TS3

ADD DATAFILE '+ DATA_DG '.

SIZE 2g

AUTOEXTEND ON NEXT 256 K

MAXSIZE 30G;  2 3 4 5 6

Tablespace altered.

SQL > select FILE_NAME, BYTES/power (1024,3) BytesInGB, increment_by INCREMENT_BY_BLOCKS, (increment_by * 8192) /power (1024,2) IncrementByInMB

2 of dba_data_files where nom_tablespace = 'TEST_TS3 ';

FILE_NAME BYTESINGB INCREMENT_BY_BLOCKS INCREMENTBYINMB

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

25 12800 100 +DATA_DG/hrcpdas/datafile/test_ts3.413.887991171

+DATA_DG/hrcpdas/datafile/test_ts3.414.887992467 32 2 .25 -> (which is 256 KB)

ASM is OMF by default unless you specify a file name.

Hemant K Collette

Tags: Database

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